10th Class Smart Editable Question Bank (English Medium – Unsolved)
10th Physics MCQs
- Encircle the Correct Option.
- 1) In SHM, velocity at extreme position is?
| a) maximum | b) minimum | c) zero | d) Sometimes more sometimes less |
- 2) Write the SI unit of frequency?
| a) N | b) m | c) Pa | d) Hz |
- 3) The maximum potential energy of a vibrating mass attached to spring is at ?
| a) In equilibrium position | b) At extreme position | c) Between equilibrium and extreme | d) All of these |
- 4) When a body attached with a spring has no displacement from its mean position this position of the body is known as :
| a) Extreme position | b) between Equilibrium and Extreme | c) Equilibrium position | d) all of these |
- 5) Force applied on a body attached with spring is directly proportional to the :
| a) Amplitude | b) Displacement | c) Spring | d) non of these |
- 6) When a spring is stretched and then released , it moves towards the mean position due to ?
| a) applied force | b) external force | c) restoring force | d) non of these |
- 7) In simple harmonic motion velocity of the object is maximum at :
| a) Both extreme position | b) Only one extreme position | c) The mean postion | d) All of the above |
- 8) The unit of time period is:
| a) Seconds | b) Hertz | c) Js-1 | d) Cs-1 |
- 9) In mass spring system when mass m reaches at mean position , the magnitude of restoring force become .
| a) zero | b) F/2 | c) F2 | d) F4 |
- 10) The main categories of wave are:
| a) 1 | b) 2 | c) 3 | d) 4 |
- 11) Which waves do not require medium for their propagation ?
| a) Sound waves | b) Machenical waves | c) Electromagnetic waves | d) All of the above |
- 12) The broad casting of radio and television programs is made possible by ?
| a) waves | b) particles | c) clouds | d) Light |
- 13) The motion of card pieces on the water surface about their mean positions is known as :
| a) oscillatory motion | b) to and from motion | c) random motion | d) vibratory motion |
- 14) The disturbance produced in the water is transferred ?
| a) perpendicular to the wave | b) opposite to the wave | c) along with waves | d) non of these |
- 15) time period is inverse of
| a) velocity | b) frequency | c) wavalength | d) time |
- 16) The part of a wave where the particles of medium are lowest from the mean position is called :
| a) crest | b) trough | c) wave front | d) wavelength |
- 17) How many types of mechnical waves ?
| a) 2 | b) 3 | c) 4 | d) 5 |
- 18) Which of the following methods of energy transfer
| a) Conduction | b) Radiation | c) Motion of waves | d) all |
- 19) In a vacuum all electromagnetic waves have the same
| a) speed | b) ferquency | c) amplitude | d) wavelength |
- 20) The number of waves passing through a point in one second is called :
| a) frequency | b) displacement | c) wavelength | d) amplitude |
- 21) Which wave cannot pass through vacuum ?
| a) sound waves | b) radio waves | c) tv waves | d) light waves |
- 22) when water waves enters the region of shallow their waves length ?
| a) decrease | b) increase | c) zero | d) remain same |
- 23) In ripple tank the troughs of waves appear on white paper is ?
| a) bright lines | b) Dark lines | c) Color lines | d) non of these |
- 24) crests of waves in a ripple tank behave like convex lens and :
| a) appear as dark fringes | b) appear as coloured fringes | c) converge the light | d) diverge the light |
- 25) The refraction of waves occurs due to the change in their ?
| a) wavelength | b) ferquency | c) speed | d) time period |
- 26) when water waves enter from deep to shallow region they bned
| a) away from the normal | b) toward the normal | c) remains straight | d) non of these |
- 27) What is the formula for e.m.f?
| a) J/Q=E | b) W/Q=E | c) W/l=E | d) Q/I=E |
- 28) One micro apmere is equal to :
| a) 10-12 A | b) 10-6 A | c) 10-9 A | d) 10-3 A |
- 29) The unit of current is ?
| a) Volts | b) Ampere | c) Joule | d) Columbus |
- 30) in metals ,current produced only due to the flow of .
| a) proteins | b) Electrons | c) free electrons | d) neutrons |
- 31) In electrolyte we assume that electric current is always due to the flow of .
| a) Negative charges | b) Neutral Particles | c) Positive charges | d) Both a ,c |
- 32) The instrument with which we can detect the presence of current in a circuit is know as :
| a) Volt meter | b) ammeter | c) galvanometer | d) Ohm meter |
- 33) In order to detect the current galvanometer is connected in circuit ?
| a) parallel | b) series | c) parallel or series | d) anywhere in the circuit |
- 34) Galvanometer is a very ?
| a) Sensitive instrument | b) large instrument | c) small instrument | d) InSensitive instrument |
- 35) By connected the shunt across the galvanometer ,the resistance of galvanometer
| a) decreases | b) increase | c) remaine same | d) non of these |
- 36) The resistance of an ammeter should be
| a) High | b) Very high | c) Low | d) Very low |
- 37) The value of current passing through a conductor is directly proportional to the
| a) Resistance | b) capacitance | c) Potential Difference | d) none of these |
- 38) Voltmeter always connected in a circuit in ?
| a) series | b) parallel | c) series or parallel | d) none of these |
- 39) The time interval after which the voltage repeats its value is known as
| a) frequency | b) Time period | c) Electric field | d) Electromagnetic field |
- 40) Write the SI unit of resistance?
| a) Ampere | b) Volts | c) Ohm | d) Faraday |
- 41) Ohm’s law applicable to
| a) Liquids only | b) Gases only | c) Liquid conductors only | d) Metallic conductors only |
- 42) The property of substance which opposes the flow of current through it is called
| a) conductivity | b) capacitance | c) resistance | d) Conduction |
- 43) At a certain temperature the resistance of wire is directly proportional to its
| a) length | b) Area of cross section | c) Shape | d) color |
- 44) If we increase the cross sectional area of the wire to double of its orignal area its resistance will become
| a) remain same | b) halved | c) one fouth | d) Doubled |
- 45) Electric energy is distributed to various house in a city from a power station by means of ?
| a) one wire | b) two wire | c) three wire | d) four wire |
- 46) the unit of electric power is ?
| a) Ampere | b) Watts | c) Jules | d) Volts |
- 47) One watt is equal?
| a) Js | b) Js-1 | c) Js-S | d) Js2 |
- 48) The electric power of washing machine in watt is :
| a) 50 | b) 750 | c) 100 | d) 800 |
- 49) color coding for netural wire is ?
| a) Black or blue | b) Red or brown | c) yellow or yellow | d) White or purple |
- 50) Power of hair dryer
| a) 130 watts | b) 1000 watts | c) 1500 watts | d) 800 watts |
- 51) When we double the voltage in a simple electric we double the
| a) current | b) power | c) resistance | d) both a.b |
- 52) Generally an atom is represented by the symbol
| a) X | b) XAZ | c) X1 | d) XA |
- 53) Atomic number is denoted by a symbol
| a) Z | b) A | c) XZA | d) XAZ |
- 54) the proton heavier than an electron?
| a) 1836times | b) 1863 times | c) 1870 times | d) 1800 times |
- 55) isotopes of hydrogen are :
| a) 2 | b) 3 | c) 4 | d) 5 |
- 56) The central part of an atom is called ?
| a) Electron | b) Proton | c) Nucleus | d) Neutrons |
- 57) the nucleus of an atom consists of
| a) Protons and Newtrans | b) Neutrons | c) Proton | d) none of these |
- 58) The particles which revolves round the nucleus is called
| a) Proton | b) Neutrons | c) Electron | d) none of these |
- 59) During natural radioactivity how many types of radiations are emitied
| a) 1 | b) 2 | c) 3 | d) 4 |
- 60) Radioactivity is a process in which certain elements naturally emit radiation with a larger charge number?
| a) 86 | b) 82 | c) 80 | d) 92 |
- 61) Radio activity is ?
| a) Automated processes | b) continuous process | c) irrreversable processes | d) All |
- 62) Which of the following elements is not radioactive?
| a) Uranium | b) Polonium | c) Thorium | d) Sodium |
- 63) Which of the following elements is radioactive?
| a) Uranium | b) Plutenium | c) Radium | d) All of these |
- 64) Atomic number can be found by what relation ?
| a) Z+A | b) A – N | c) A+N | d) Z-A |
- 65) alpha rays consist of particals which have
| a) Positive charge | b) Negative charge | c) No charge | d) None of these |
- 66) How many distances can be covered in the particles emitted from uranium?
| a) 8.62cm | b) 8.61cm | c) 8.64cm | d) 2.7cm |
- 67) by nature gamma rays are :
| a) Positively charged radiation | b) Negative charge reduction | c) Electromagnetic radiation | d) Magnetic radiation |
- 68) For the dignosis tumor is used
| a) Carbon 14 | b) Cobalt 32 | c) Phosphorus 60 | d) Iodine 131 |
- 69) The half life of carbon in years is :
| a) 7530 year | b) 5730 year | c) 5370 year | d) 3750 year |
- 70) The isototpes of iodine 131 is used in the treatment of :
| a) blood cancer | b) bone cancer | c) lungs cancer | d) thyroid cancer |
- 71) The half life of hydrogen is :
| a) 12.3 years | b) 5730 years | c) 30 year | d) 2.85 years |
- 72) The half-life of plutonium is years
| a) 3.85 | b) 2.85 | c) 1.85 | d) 0.85 |
- 73) safe limit of radiation exposure in one year is :
| a) 4rem | b) 5rem | c) 3rem | d) 6rem |
- 74) It can usually be replaced by a shower of —— in a more settled element:
| a) 92 | b) 82 | c) 90 | d) 80 |
- 75) Which form of energy sound is ?
| a) Mechanical | b) Electrical | c) Thermal | d) Chemical |
- 76) When a body vibrates about its mean position , it produces.
| a) Sound waves | b) Electromagnetic waves | c) Light waves | d) Transverse waves |
- 77) Distance between two consecutive waves compression and rarefactions is called.
| a) Focal length | b) Wave length | c) Frequency | d) Time period |
- 78) The example of longitudinal waves is.
| a) Radio waves | b) Light waves | c) Sound waves | d) Water waves |
- 79) Which of these waves consist of compressions and rerefactions ?
| a) X-Rays | b) Television waves | c) Sound waves | d) Radio waves |
- 80) Sound is always produced by .
| a) Vibrating body | b) Bodies at rest | c) Moving body | d) None of these |
- 81) In our laboratory , the device which is used to produce particular sound is called.
| a) Radio | b) Tape recorder | c) Tuning fork | d) Vibrating body |
- 82) When we strike the tuning fork on a rubber pad , the vibration of tuning fork can be felt by touching its.
| a) Middle part | b) Stem | c) Prongs | d) None of these |
- 83) Regions in which pressure of air is greater than the normal atmospheric pressure is called.
| a) Longitudinal waves | b) Compressions | c) Compressional waves | d) Refractions |
- 84) Regions in which pressure of air is less than the normal atmospheric pressure is called.
| a) Longitudinal waves | b) Compressions | c) Compressional waves | d) Refractions |
- 85) Compressional waves are also known as.
| a) Electromagnetic waves | b) Longitudinal waves | c) Stationary waves | d) Mechanical waves |
- 86) When Compressional waves pass through the air , the molecules of air vibrate.
| a) Opposite to the direction of wave | b) In the direction of wave | c) Perpendicular to the direction of wave | d) None of these |
- 87) The intensity level of train siren is .
| a) 120 dB | b) 100 dB | c) 130 dB | d) 150 dB |
- 88) Sound energy flowing per second through a unit area held perpendicular to the direction of sound waves is called the.
| a) Quality | b) Pitch | c) Loundness | d) Intensity |
- 89) The intensity of faintest audible sounds.
| a) 10-12 Wm-2 | b) 10-10 Wm-2 | c) 10-1 Wm-2 | d) 1 Wm-2 |
- 90) We can distinguish between a shrill and grave sound by its .
| a) Pitch | b) Area | c) Amplitude | d) Loudness |
- 91) The characteristic of sound by which we can distinguish between two sound of same loudness and pitch is called.
| a) Sound level | b) Quality | c) Intensity | d) Frequency |
- 92) Speed of sound at 250 C in flint glass is.
| a) 3980 m / s | b) 5980 m / s | c) 6040 m / s | d) 5950 m / s |
- 93) Wm-2 is the SI unit of .
| a) Intensity of sound | b) Speed of sound | c) Frequency of sound | d) Wavelength of sound |
- 94) One bel is equal to .
| a) 10 dB | b) 20 dB | c) 40 dB | d) 90 dB |
- 95) If the area of the vibrating body is large , the sound produced will be.
| a) Loud | b) Faintest | c) Weak | d) None of these |
- 96) A sound appears louder to a person with .
| a) Large ears | b) Defective ears | c) Sensitive ears | d) Small ears |
- 97) Pitch of sound depends on .
| a) Frequency | b) Distance | c) Area | d) Amplitude |
- 98) What happens to the atomic number of an element which emits one alpha particle and a beta particle ?
| a) Increases by 1 | b) Stays the same | c) Decreases by 2 | d) Decreases by 1 |
- 99) The half–life of a certain isotope is 1 day. What is the quantity of the isotope after 2 days.
| a) One half | b) One quarter | c) One eighth | d) Zero |
- 100) When uranium (92 protons) ejects a beta particle, how many protons will be in the remaining nucleus?
| a) 89 protons | b) 90 protons | c) 91 protons | d) 93 protons |
- 101) Release of energy by the Sun is due to
| a) Nuclear fission | b) Nuclear fusion | c) Burning of gases | d) Chemical reaction |
- 102) When a heavy nucleus splits into two lighter nuclei, the process would
| a) Release nuclear energy | b) Absorb energy | c) Release chemical energy | d) Absorb chemical energy |
- 103) The reason carbon-dating works is that
| a) Plants and animals are such strong emitters of carbon-14 | b) After a plant or animal dies, it stops taking in fresh carbon-14 | c) There is so much non-radioactive carbon dioxide in the air | d) When a plant or an animal dies it takes in fresh carbon |
- 104) In computer terminology information means:
| a) Any data | b) Processed data | c) raw data | d) large data |
- 105) The brain of any computer system is:
| a) Monitor | b) Hard disk | c) CPU | d) Keyboard |
- 106) From which of the following you can get information almost about everything:
| a) Book | b) Internet | c) Teacher | d) Computer |
- 107) Which of the following is not processing?
| a) Arranging | b) Manipulating | c) Calculating | d) Gathering |
- 108) Which is the most suitable means of reliable continuous communication between an orbiting satellite and Earth?
| a) micro waves | b) radio waves | c) sound waves | d) any light waves |
- 109) The basic operations performed by a computer are:
| a) arithmetic operations | b) Non-arithmetic operations | c) logical operations | d) both a and c |
- 110) What does the term e-mail stand for?
| a) emergency mail | b) electronic mail | c) extra mail | d) external mail |
- 111) The particles emitted from a hot cathode surface are :
| a) Positive ions | b) Negative ions | c) Protons | d) Electrons |
- 112) The process by which electrons are emitted by a hot metal surface is known as
| a) boiling | b) evaporation | c) conduction | d) Thermionic emission |
- 113) The output of a NAND gate is 0 when
| a) both of its inputs are 0 | b) both of its inputs are 1 | c) any of its input is 0 | d) any of its inputs is 1 |
- 114) If X=A.B then X is 1 when
| a) A and B are 1 | b) A or B is 0 | c) A is 0 and B is 1 | d) A is 1 and B is 0 |
- 115) The output of a two-input NOR gate is1 when
| a) A is ‘1’ and B is ‘0’ | b) A is ‘0’ and B is ‘1’ | c) both A and B are ‘0’ | d) both A and B are ‘1’ |
- 116) AND gate can be formed by using two
| a) NOT gates | b) OR gates | c) NOR gates | d) NAND gates |
- 117) Which statement is true about the magnetic poles?
| a) Unlike poles repel | b) Like poles attract | c) Magnetic poles do not effect each other | d) A single magnetic pole does not exist |
- 118) What is the direction of the magnetic field lines due to a bar magnet?
| a) From north pole to south pole | b) From south pole to north pole | c) From side to side | d) There are no magnetic field lines |
- 119) The presence of a magnetic field can be detected by a
| a) Small mass | b) Stationary positive charge | c) Stationary negative charge | d) Magnetic compass |
- 120) If the current in a wire which is placed perpendicular to a magnetic field increases the force on the wire
| a) Increase | b) Decreases | c) Remains the same | d) Will be zero |
- 121) A D.C motor converts
| a) Mechanical energy into electrical energy | b) Mechanical energy into chemical energy | c) Electrical energy into mechanical energy | d) Electrical energy into mechanical |
- 122) Which part of a D.C motor reverses the direction of current through the coil every half-cycle?
| a) The armature | b) The commutator | c) The brushes | d) The slip rings |
- 123) The step-up tranformer
| a) Increases the input current | b) Increases the input voltage | c) Has more turns in the primary | d) Has less turns in the secondary |
- 124) The turn ratios of a transformer is 10. It means
| a) ls=10lp | b) Ns=Np/10 | c) Ns=10Np | d) Vs=Np/10 |
- 125) What happens to the intensity or the brightness of the lamps connected in series and more lamps are added?
| a) Increases | b) Decreases | c) Remains the same | d) Cannot be predicted |
- 126) Electric potential and e.m.f
| a) Are the same terms | b) Are the different terms | c) Have different units | d) Both a and b |
- 127) If we double both the current and the voltage in a circuit while keeping its resistance constant, the power
| a) Remains unchanged | b) Halves | c) Four times | d) Quarter |
- 128) What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A ?
| a) 4.8 W | b) 14.5 W | c) 30 W | d) 60 W |
- 129) The combined resistance of two identical resistors, connected in series is 8 Ω. Their combined in a parallel arrangement will be
| a) 2 Ω | b) 4 Ω | c) 8 Ω | d) 12 Ω |
- 130) A positive eletrice charge:
| a) Attracts positive charge | b) Repels other positve charge | c) Attracts a neutral charge | d) Repels a neutral charge |
- 131) An object gains exess nagetive charge after being rubbed against another object which is:
| a) Neutral | b) Negatively charged | c) Positively charged | d) Either a, b or c |
- 132) Two uncharged object A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A?
| a) Remains uncharged | b) Becomes positively charged | c) Becomes negatively charged | d) Unpredictable |
- 133) When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it.What does this observation indicate?
| a) The rod and the paper are oppositely charged | b) The rod acquires a positive charge | c) The rod and the paper have the same charged | d) The rod acquires a negative charge |
- 134) According to Coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation increases?
| a) Increases | b) Decreases | c) Remains unchanged | d) Cannot be determined |
- 135) The coulomb’s law is vaild for the charges which are
| a) Moving and point charges | b) Moving and non-point charges | c) Stationary and point charges | d) Stationary and large size charges |
- 136) A positive and a negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1cm apart, the force between them is
| a) 4 times smaller than before | b) 4 times larger than before | c) 8 times larger than before | d) 16 times larger than before |
- 137) Electric field lines
| a) Always cross each other | b) Never cross each other | c) Cross each other in the region of strong field | d) Cross each other in the region of weak field |
- 138) Capacitance is defined as
| a) VC | b) Q/V | c) QV | d) V/Q |
- 139) Which of the following quantities is not changed during refraction of light?
| a) Its direction | b) Its speed | c) Its frequency | d) Its wavelength |
- 140) A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
| a) +5.0 cm | b) +7.5 cm | c) +15 cm | d) +20 cm |
- 141) An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?
| a) -4.1 cm | b) -8.2 cm | c) -9.9 cm | d) -20 cm |
- 142) The index of refraction depends on
| a) The focal length | b) The speed of light | c) The image distance | d) The object distance |
- 143) Which type of image is formed by a concave lens on a screen?
| a) Inverted and real | b) Inverted and virtual | c) Upright and real | d) Upright and virtual |
- 144) Which type of image is produce by the converging lens of human eye of it views a distant object?
| a) Real, erect and same size | b) Real, inverted & diminished | c) Virtual, erect & diminished | d) Virtual, inverted & magnified |
- 145) Image formed on a camera is:
| a) Real, inverted and diminished | b) Virtual, upright and diminished | c) Virtual, upright and magnified | d) Real, inverted and magnified |
- 146) If a ray of light in glass is incident on an air surface at an angle greater than the critical angle, the ray will :
| a) Refract only | b) Reflect only | c) Partially refract and partially reflect | d) Diffract only |
- 147) The critical angle for a beam of light passing from water into air is 48.8 degrees. This means that all light rays with an angle of incidence greater than this angle will be
| a) Absorbed | b) Totally reflected | c) Partially reflected and partially transmitted | d) Totally transmitted |
- 148) How does sound travel from its source to your car?
| a) By change in air pressure | b) By vibrating in wires or strings | c) By electromagnetic waves | d) By infrared waves |
- 149) Astronauts in space used to communicate with each other by radio links because
| a) Sounds waves travel very slowly in space | b) Sound waves travel very fast in space | c) Sound waves cannot travel in space | d) Sound waves have low frequency in space |
- 150) The loudness of a sound is most closely related to its
| a) Frequency | b) Period | c) Wavelength | d) Amplitude |
- 151) For a normal person, audible frequency range for sound wave lie between
| a) 10 Hz and 10 KHz | b) 20 Hz and 20 KHz | c) 25 Hz and 25 KHz | d) 30 Hz and 30 KHz |
- 152) When the frequency of a sound wave is increased, which of the following will decrease?
I) Wavelength II) period III) amplitude
| a) i only | b) iii only | c) i and ii only | d) i and iii only |
- 153) Which of the following is an example of simple harmonic motion?
| a) Motion of a simple pendulum | b) The motion of ceiling fan | c) The spinning of the earth on its axis | d) A bouncing ball on a floor |
- 154) If the mass of the bob of a pendulum is increased by a factor of 3, the period of the pendulum’s motion will
| a) By increased by a factor of 2 | b) Remain same | c) Be decreased by a factor of 2 | d) Be decreased by a factor of 4 |
- 155) Which of the following devices can be used to produce both a transverse and longitudinal wave?
| a) A string | b) A ripple tank | c) a helical spring (slinky) | d) A tuning fork |
- 156) Waves transfer
| a) Energy | b) Frequency | c) Wavelength | d) Velocity |
- 157) A large ripple tank with a vibrator working at a frequency of 30 Hz produces 25 complete waves in a distance of 50 cm. The velocity of the wave is
| a) 53cms-1 | b) 60 cms-1 | c) 750 cms-1 | d) 1500 cms-1 |
- 158) Which of the following characteristics of a wave is independent of the others
| a) Speed | b) Frequency | c) Amplitude | d) Wavelength |
- 159) The speed of sound at 00 C is.
| a) 331 ms-1 | b) 231 ms-1 | c) 376 ms-1 | d) 386 ms-1 |
- 160) In general , the speed of sound is greater in .
| a) Gases | b) Liquids | c) Solids | d) None of these |
- 161) If speed of sound is 320 ms-1 , the distance covered in a time of 1.5 s will be .
| a) 221 m | b) 480 m | c) 480 cm | d) 408 m |
- 162) Calculate the frequency of sound wave of speed 340 ms-1 and wave length 0.5 m ?
| a) 680 Hz | b) 170 Hz | c) 0.5 Hz | d) 340 Hz |
- 163) What will be the speed of sound having frequency 680 Hz and wavelength of 0.5 m ?
| a) 1340 ms-1 | b) 680 ms-1 | c) 340 ms-1 | d) 134 ms-1 |
- 164) Old people cannot hear sounds even above .
| a) 15000 Hz | b) 12000 Hz | c) 8000 Hz | d) 4000 Hz |
- 165) Ultrasonic are the sound waves with frequency higher than the .
| a) 25,000 Hz | b) 20,000 Hz | c) 16,000 Hz | d) 8,000 Hz |
- 166) The level of noise recommended in most countries over an eight hour workday is usually.
| a) 85 – 90 dB | b) 84 – 90 dB | c) 90 – 83 dB | d) 90 – 80 dB |
- 167) The center of the mirror is called.
| a) Pole | b) Aperture | c) Optical center | d) Principal axis |
- 168) If the image is virtual then its distance from lens is taken.
| a) Half | b) Double | c) Negative | d) Positive |
- 169) The Power of lens is equal to
| a) | b) | c) | d) |
- 170) The splitting of white light into its constituent colors is known as.
| a) Total internal reflection | b) Refraction | c) Reflection | d) Dispersion |
- 171) Unit for power of lens is.
| a) Centimeter | b) Meter | c) Watt | d) Dioptre |
- 172) An ophthalmologist places a 2.00 D lens next to 0.35 D lens . The power of combination is.
| a) 2.35 D | b) 2.00 D | c) 1.65 D | d) 0.35 D |
- 173) In an astronomical telescope , the distance between objective lens and eye piece is.
| a) Less than f0 + fe | b) Equal to f0 – fe | c) Equal to f0 + fe | d) Greater than f0 + fe |
- 174) A totally reflecting prism has one of its angle equal to 900 and the remaining two angles are equal to .
| a) 600 and 300 | b) 450 and 450 | c) 450 and 300 | d) 600 and 450 |
- 175) Prism is a transparent body having three rectangular and
| a) Two triangular surface | b) One triangular surface | c) Four triangular surface | d) Three triangular surface |
- 176) The angle of triangular surface opposite to the base of prism is called.
| a) Incident ray | b) Angle of prism | c) Angle of incidence | d) Refracted ray |
- 177) When the angle of incidence is continuously increased from a small value , the angle of deviation first.
| a) Start increasing | b) Remains the same | c) Starts decreasing | d) None of these |
- 178) The minimum value of angle of deviation is known as.
| a) Critical angle | b) Angle of reflection | c) Angle of refraction | d) Angle of minimum deviation |
- 179) Whenever there is a deficiency of electrons on a body the body will be charge :
| a) Negative | b) Positive | c) Negative or Positive | d) None of these |
- 180) Electrostatic is branch of physics which deals with the charges ?
| a) At rest | b) Hanging | c) In motion | d) Neutral particle |
- 181) Elctroscope is used to detect ?
| a) Current | b) Voltage | c) Charge | d) Electrons |
- 182) The critical angle of water is.
| a) 950 | b) 900 | c) 4880 | d) 48.80 |
- 183) Condition for total internal reflection are.
| a) 5 | b) 4 | c) 3 | d) 2 |
- 184) The critical angle of glass is.
| a) 420 | b) 900 | c) 450 | d) 00 |
- 185) To see the automobiles coming from behind in motor cycle and automobiles we use.
| a) Convex mirror | b) Concave mirror | c) Both concave and convex mirrors | d) None of these |
- 186) The formula of focal length for spherical mirror is.
| a) | b) | c) | d) |
- 187) Focal length of the concave mirror.
| a) Is smaller | b) Is greater | c) Is negative | d) Is positive |
- 188) Focal length of concave lens.
| a) Is smaller | b) Is greater | c) Is negative | d) Is positive |
- 189) A mirror whose inner curved surface is reflecting is called.
| a) Concave mirror | b) Convex mirror | c) Both convex and concave mirrors | d) None of these |
- 190) The center of the sphere , of which a concave or convex mirror is a part is known as.
| a) Center of curvature | b) Principal focus | c) Optical center | d) Radius of curvature |
- 191) The radius of the spherical mirror is called.
| a) Center of curvature | b) Principal focus | c) Optical center | d) Radius of curvature |
- 192) A fixed point length through which a ray of light does not change its path is called.
| a) Centre of curvature | b) Optical center | c) Focus | d) Pole |
- 193) Radius of curvature is of the focal length.
| a) Three times | b) Equal | c) Double | d) Half |
- 194) If the radius of curvature of mirror is 30 cm , then its focal length will be .
| a) 30 cm | b) 20 cm | c) 15 cm | d) 10 cm |
- 195) An induced current will flow through a coil when the magnet and the coil are
| a) At rest | b) In relative motion | c) Very close to each other | d) Far from each other |
- 196) If you change the direction of movement of the magnet in the coil, will the induced current flow?
| a) In the same direction | b) In the opposite direction | c) In any direction | d) None of these |
- 197) The direction of the induced emf in the circuit is in accordance with which conservation law?
| a) mass | b) charge | c) momentum | d) energy |
- 198) Michael Faraday belong to :
| a) England | b) United States | c) Saudi Arab | d) Russia |
- 199) Which things work on the principle of electromagetic induction in hydro electric power house ?
| a) Motor | b) Generator | c) Gelvonic cell | d) Voltic Cell |
- 200) Introduced the laws of electromagnetic induction and electrolysis?
| a) Simon Ohm | b) George Columb | c) Newton | d) Michael Faraday |
- 201) What is the study of the magnetic effect of current called?
| a) Electricity | b) Electromagnetism | c) Magnetism | d) Electric capacity |
- 202) The presence of magnetic filed can be detected by a :
| a) Small mass | b) Statinoary positive charge | c) Statinoary negative charge | d) Magnetic compass |
- 203) The magnetic effect of current was first discovered by :
| a) Ohm | b) Oersted | c) Faraday | d) None of these |
- 204) We can trace the lines of force by any conductor with the help of :
| a) Bar magnet | b) Magnet | c) Compass needle | d) Electric needle |
- 205) The direction of magnetic lines of force around a current carrying conductor is found by
| a) Lens law | b) Fleming’s left-handed law | c) Right hand grip rules | d) All above |
- 206) is equal to
| a) | b) | c) | d) |
- 207) Concave mirrors are used as shaving mirror are.
| a) Of small focal length | b) Of large focal length | c) Of half focal length | d) Of suitable focal length |
- 208) The mirror formula for concave mirror is
| a) | b) | c) | d) |
- 209) If ” p ” is the object height and ” q ” is the image height then the magnification ” m ” is given by.
| a) | b) | c) | d) |
- 210) If an image is three times of its object then the magnification is.
| a) 6 | b) 4 | c) 3 | d) 2 |
- 211) SI unit of capacitance ?
| a) newton | b) volt | c) coloumb | d) farad |
- 212) The ability of capacitor to store charge is called
| a) Resistance | b) Electric potential | c) Capacitance | d) Electric energy |
- 213) The Refractive index of water is.
| a) 1.39 | b) 1.33 | c) 1.36 | d) 2.33 |
- 214) Index of refraction of diamond is.
| a) 2.42 | b) 2.21 | c) 1.52 | d) 1.33 |
- 215) Refractive index of air is.
| a) 4 | b) 3 | c) 2 | d) 1 |
- 216) The refractive index of ice is.
| a) 1.33 | b) 1.31 | c) 1.52 | d) 2.42 |
- 217) The speed of light in water is.
| a) 2.0 × 108 ms-1 | b) 3.3 × 108 ms-1 | c) 2.3 × 108 ms-1 | d) 3.0 × 108 ms-1 |
- 218) The strength of an electric field at any point in space :
| a) Electric field lines | b) Electrostatic induction | c) Electric Field Intensity | d) Electric potential |
- 219) The electric lines of force were introduced by :
| a) Newton | b) Einstein | c) Columbus | d) Faraday |
- 220) Speed of light in glass.
| a) 3 × 108 ms-1 | b) 3 × 10-8 ms-1 | c) 2 × 10-8 ms-1 | d) 2 × 108 ms-1 |
- 221) For the examination of ear , nose , throat and eye , doctors use.
| a) Convex mirror | b) Concave mirror | c) Both concave and convex | d) None of these |
- 222) The refractive index of medium is.
| a) v = cn | b) n = cv | c) | d) |
- 223) Refractive index of cubic zirconia is.
| a) 1.33 | b) 1.66 | c) 2.42 | d) 2.21 |
- 224) The position of fish inside the water seems to be at less depth than that of actual depth , because of
| a) Dispersion of light | b) Total internal reflection | c) Refraction of light | d) Reflection of light |
- 225) What is the SI unit of electric potential?
| a) Volt | b) Jule | c) Ampere | d) Ohm |
- 226) One volt is equal to ?
| a) 1 JC | b) 1J | c) 1JC-1 | d) 1C-1 |
- 227) Five joules of work is done on a 2 C charge from one place to another .The potential difference between the place is :
| a) 0.5V | b) 2V | c) 5V | d) 10V |
- 228) A strong field lies in Fraday cage?
| a) Gravitational | b) Electric | c) Magnetic | d) Geometric |
- 229) According to Coulomb’s law, the force of gravity acts between the force of gravity?
| a) Any two bodies | b) Two types of objects | c) Two small bodies | d) Two large bodies |
- 230) In computer terminology information means.
| a) Large data | b) Processed data | c) Raw data | d) Any data |
- 231) Information technology is.
| a) Changing constantly | b) Changing slowly | c) Changing speedily | d) Not changing |
- 232) Latest telecommunication device are.
| a) Very dangerous to use | b) Too costly to purchase | c) Very simple | d) Much better and more efficient |
- 233) Latest form of the telephone is the
| a) Video-phone | b) Head-phone | c) Gramo-phone | d) None of the above |
- 234) The scientific method of storing , arranging information for proper use and to communicate them to others is called the
| a) Telecommunication | b) Television | c) Computer | d) E.mail |
- 235) The transformer only works
| a) On AC | b) On DC | c) Both a,b | d) None of these |
- 236) Transformer works on this principle
| a) Mutual induction | b) Self induction | c) The law of lenses | d) Faraday’s law |
- 237) Transformer has coils
| a) 2 | b) 3 | c) 1 | d) 4 |
- 238) The input voltage is applied to the transformer
| a) Primary coil | b) Secondary coil | c) Both coils | d) None of these |
- 239) In ideal transformer ,which quantity remains constant :
| a) Voltage | b) power | c) Current | d) both a,b |
- 240) What is the equation of not operation?
| a) X=A.B | b) X=A+B | c) | d) |
- 241) What is the number of input terminals in Not Gate?
| a) 1 | b) 2 | c) 3 | d) 4 |
- 242) What is the basic logic operation of not gate?
| a) Inversion and non-inversion | b) Addition | c) non-inversion | d) Inversion |
- 243) The electronic circuit which gives the inversion of input signals at the out put is called
| a) And gate | b) OR gate | c) Not gate | d) Nor gate |
- 244) Which gate converts a logic level to an anti-logic level?
| a) Not gate | b) And gate | c) OR gate | d) None of these |
- 245) The computer based information system ( CBIS ) is formed by ———— components.
| a) 6 | b) 5 | c) 4 | d) 3 |
- 246) In computer terminology the term machinery refers to.
| a) Procedure | b) Data | c) Hardware | d) Software |
- 247) X=A+B shows ___________ operation .
| a) AND | b) OR | c) NAND | d) NOT |
- 248) For OR operation switches are connected in
| a) Series | b) Parallel | c) Open circuit | d) None of above |
- 249) The bollean expression for OR gate is
| a) X=A+B | b) X=A.B | c) B.A=X | d) B+A=X |
- 250) E-mail is the abbreviation of.
| a) Urgent mail | b) Electronic mail | c) Emergency mail | d) None of these |
- 251) Which of these is not a web browser ?
| a) Safari | b) Mozilla Fire Fox | c) YouTube | d) Chrome |
- 252) With broadband information can be loaded.
| a) In 2 days | b) In 1 day | c) In 1 sec | d) In 1 min |
- 253) Word processing is used for
| a) Data managing | b) Typing | c) Designing | d) None of the above |
- 254) In the remote control device.
| a) Infra-red waves are used | b) Sound waves are used | c) Mircowaves are used | d) None of them |
- 255) In big departmental stores, in order to read bar codes , we use.
| a) Camera | b) Optical lenses | c) Data management | d) Optical scanners |
- 256) If X=A.B ,then X =1 when
| a) A=1,B=1 | b) A=0,B=1 | c) A=0,B=0 | d) A=1,B=0 |
- 257) Truth table of logic function ?
| a) Tabulates all its input conditions | b) Summaries its output values | c) Displays all its input and output possible | d) all the above |
- 258) George Bole invented ?
| a) Boolean Algebra | b) Arithemetic Algebra | c) Mean Algebra | d) Geometry |
- 259) The electronic systems used at present consist of :
| a) Analogue circuits | b) Digital circuits | c) Both a ,b | d) None of these |
- 260) Special algebra used in digital system is called
| a) De. Morgan algebra | b) Complex algebra | c) Sample algebra | d) Boolean algebra |
- 261) Which one is not the basic operation of Boolean variables ?
| a) And operation | b) OR. Operation | c) Nor operation | d) Not operation |
- 262) The number of basic operations upon which digital electronics is based ?
| a) 2 | b) 3 | c) 4 | d) 5 |
- 263) Digital system can describe the behaviour of any two variables by :
| a) 10 and 20 | b) 9 and90 | c) 10and 0 | d) 0 and 1 |
- 264) The electronic circuits which perform the various logic operations are called ?
| a) Logic Gates | b) Digital system | c) Series circuit | d) Parallel circuit |
- 265) A system which deals with quantities or variables which have only two discrete values of states is called
| a) Automatic system | b) Logic Gates | c) Boolean expression | d) Digital system |
- 266) Which gate is used in making burglar alarm .
| a) NAND gate | b) NOT gate | c) AND gate | d) OR gate |
- 267) OR gate can be formed by using two .
| a) NAND gates | b) NOR gates | c) OR gates | d) NOT gates |
- 268) The output of NOR gate will ” 0 ” if.
| a) A = 1 , B = 1 | b) A = 0 , B = 1 | c) A = 1 , B = 0 | d) All of these |
- 269) If A + B = X , Then X = 0 when
| a) A = 0 , B = 0 | b) A = 1 , B = 0 | c) A = 0 , B = 1 | d) A = 1 , B = 1 |
- 270) The logic operation performed by the NOR gate is.
| a) | b) | c) X = A.B | d) X = A + B |
- 271) The main branches of electronis are :
| a) Analogue | b) Digital | c) Both a, b | d) None of the above |
- 272) Those quantities whose values does very continuously or remain constant are called
| a) constant quantities | b) Continuous quantities | c) Digital quantities | d) Analog quantities |
- 273) Those quantities whoes vlaues does not very continuously or remain constant are called :
| a) constant quantities | b) Analog quantities | c) Digital quantities | d) Continuous quantities |
- 274) The temperature of air is ?
| a) Constant quantity | b) Analogue quantity | c) Digital quantity | d) None of them |
- 275) Which of the following is an analogue quantity ?
| a) time | b) pressure | c) distance | d) all above |
- 276) The electronics circuits which process analogue quantities is called
| a) Analog electronics | b) Variable electronics | c) Digital electronics | d) None of them |
- 277) The potential which is fed to the amplifier is ?
| a) A digital signal | b) A analog signal | c) A electrical signal | d) All above |
- 278) Amplifier is an analog circuit that amplifies the signal without changing its —–
| a) Size | b) Amplitude | c) Power | d) Shape |
- 279) The energy required per unit charge to move from one point to another is called
| a) Force | b) Potential difference | c) Capacitance | d) Current |
- 280) The value of resistance which is connected with galvanometer in order to convert it into voltmeter is
| a) Low | b) high | c) very high | d) very low |
- 281) Voltmeter always connected in a circuit in
| a) Series | b) Parallel | c) Both of these | d) None of these |
- 282) The SI unit of specific resistance is
| a) ms | b) Ωm | c) Ωm2 | d) Ωs |
- 283) The frequency of A.C used in our houses is
| a) 60 Hz | b) 30 Hz | c) 50 Hz | d) 90 Hz |
- 284) Electricity is distributed to various houses in a city from a power station by means of
| a) Four wires | b) One wire | c) Two wires | d) Five wires |
- 285) Transformer is used for
| a) voltage | b) Work | c) energy | d) charge |
- 286) Step up transformer is used for
| a) increase resistance | b) increase voltage | c) Decrease voltage | d) Both a and b |
- 287) For an ideal transformer
| a) PP=PS | b) PP:PP | c) P=S | d) S=P |
- 288) If X= then X=1 when
| a) A= 0 , B = 0 | b) A = 0 , B = 1 | c) A = 1 , B = 1 | d) Both b and c |
- 289) The number of Neutrons in Tritium is
| a) 1 | b) 2 | c) 3 | d) 4 |
- 290) The smallest part of an element is called?
| a) Atom | b) Proton | c) Neutron | d) Electron |
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10th Physics LQs & Numericals
Answer the Following Long Questions
- i) What is Simple Harmonic Motion? What are the necessary conditions for a body to execute simple harmonic motion?
- ii) Explain wave as a carrier of energy and prove that v=f
- iii) The frequency of a piece of wood vibrating on the surface of water in a ripple tank is 12Hz. The wavelength of the resulting wave is 3 cm. What will be the speed of the wave?
- iv) A wave moves on slinky with frequency of 4 Hz and wave length of 0.4 m what is the speed of the wave ?
- v) If 100 waves pass through a point of medium in 20s, what will be the frequency and time period of that wave? What would be the speed of the wave if it were 6cm long?
- vi) What is a ripple tank? Describe the construction and working of Ripple Tank?
- vii) A 100,000 ohm how much current flows through your body if you touch the terminals of a 12V battery ?
- viii) Discuss the main feature of series combination of resistors ?
- ix) Describe the process of radioactivity?
- x) Describe the process of natural radioactivity?
- xi) Ashes from camfire deep in a cave show carbon14 activity of only one eight the activity of fresh wood.How long age was that camfire made ?
- xii) What is meant by radio isotopes ? Describe their uses in medicine industry or research ?
- xiii) Define loudness of sound . Upon which factor does it depends ?
- xiv) What is intensity level of sound ? Write the name of its unit ?
- xv) What is meant by background radiations?Enlist some source of background radiations.
- xvi) Nuclear fusion reaction is more reliable and sustainable source of energy then nuclear fission chain reaction. Justify this statement with plausible arguments.
- xvii) What are two common radiations hazards?Briefly describe the precautions that are taken against them.
- xviii) Name the different information storage devices and describe their uses.
- xix) Differentiate between the primary memory and the secondary memory.
- xx) Explain briefly the transmission of radio waves through space ?
- xxi) Explain the components of Computer Based Information System (CBIS).
- xxii) Write down some benefits of using digital electronics over analogue electronics.
- xxiii) Demonstrate by an experiment that a magnetic field is produced around a straight current-carrying conductor.
- xxiv) What is the transformer? Explain the working of a transformer in connection with mutual induction.
- xxv) What is the difference between electronic current and conventional current?
- xxvi) Explain Ohm’slaw.What are its limitations?
- xxvii) Discuss the main features of parallel combination of resistors.
- xxviii) What is gold leaf electroscope? Discuss its working principle with a labelled diagram.
- xxix) With the help of electroscope how you can find presence of charge on a body .
- xxx) What is the meant by the principal focus of a ( Convex lens and Concave lens ) ( Illustrate your answer with ray diagrams ).
- xxxi) Draw ray diagrams to show the formation of images in the normal human eye.
- xxxii) What is the effect of the medium on the speed of sound? In which medium sound travels more faster: air, solid or liquid? Justify your answer.
- xxxiii) Sound is a form of wave. List at least three reasons to support the idea that sound is a wave.
- xxxiv) What is meant by intensity level of sound? Name and define the unit of intensity level of sound.
- xxxv) What are damped oscillations? How damping progressively reduces the amplitude of oscillation?
- xxxvi) How can you define the term wave? Elaborate the difference between mechanical and electromagnetic waves with examples.
- xxxvii) Distinguish between longitudinal and transverse waves with suitable examples.
- xxxviii) State and explain total internal reflection with help of diagram ?
- xxxix) Two bodies are oppositely charged with 500C and 100C charge .Find the force between the two charges if the distance between them in air 0.5m.
- xl) Explain the relationship between electric field and electric intensity?
- xli) Describe the parallel joints of a capacitor?
- xlii) What is meant by refraction of light ? Describe the passage of height through parallel sided transparent material ?
- xliii) What is the transformer? Explain the working of a transformer in connection with mutual induction
- xliv) Define AND and OR gate and write their truth table ?
- xlv) Explain the and operation and also write the and gate symbol and truth table?
- xlvi) What do you know about the thinking circuit?
- xlvii) Define analog and digital electronic and give one example of each ?
- xlviii) What are the benefits of using digital electronics over analogue electronics explain ?
- xlix) NAND gate is the reciprocal of AND gate . Discuss ?
- l) What do you mean by the term ”Electromotive force”? Is it really a force . Explain
Answer the Following Questions
- i) The time period of a simple pendulum is 2 s. What will be its length on the Earth? What will be its length on the moon if gm= ge/6 ? where ge= 10 ms-2
- ii) Find the time periods of a simple pendulum of 1 m length placed on Earth and on Moon. The value of g on the surface of Moon is 1/6thof its value on Earth, where geis 10 ms-2.
- iii) A simple pendulum completes one vibration in two seconds. Calculate its length when g = 10 ms-2.
- iv) If at Anarkali Bazar Lahore, intensity level of sound is 80 dB, what will be the intensity of sound there?
- v) At a particular temperature,the speed of sound in air is 330 ms-1. If the wavelength of a note is 5 cm, calculate the frequency of the sound wave. Is this frequency in the audible range of the human ear?
- vi) A doctor counts 72 heartbeats in 1 min. Calculate the frequency and period of the heartbeats.
- vii) A sound wave has a frequency of 2 k Hz and wavelength 35 cm. How long will it take to travel 1.5 km?
- viii) An object 30 cm tall is located 10.5 cm from a concave mirror with focal length 16 cm. (a) Where is the image located? (b) How high is it?
- ix) An object and its image in a concave mirror are of the same height, yet inverted, when the object is 20 cm from the mirror. What is the focal length of the mirror?
- x) An object 10.0 cm in front of a convex mirror forms an image 5.0 cm behind the mirror. What is the focal length of the mirror?
- xi) Find the focal length of a mirror that forms an image 5.66 cm behind the mirror of an object placed at 34.4 cm in front of the mirror. Is the mirror concave or convex?
- xii) An image of a statue appears to be 11.5 cm behind convex mirror with focal length 13.5 cm. Find the distance from the statue to the mirror.
- xiii) An object 4 cm high is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Calculate the position and size of the image. Also state nature of the image.
- xiv) An object 4 cm high is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Calculate the position and size of the image. Also state nature of the image.
- xv) A convex lens of focal length 6 cm is to be used to form a virtual image three times the size of the object. Where must the lens be placed?
- xvi) The charge of how many negatively charged particles would be equal to 100 C. Assume charge on one negative particle is 1.6 10-19 C?
- xvii) Two point charges q1 = 10 C and q2= 5 C are placed at a distance of 150 cm. What will be the Coulomb’s force between them? Also find the direction of the force.
- xviii) The force of repulsion between two identical positive charges is 0.8 N, When the charges are 0.1 m apart. Find the value of each charge.
- xix) The electric potential at a point in an electric field is 104 V. If a charge of +100 C is brought from infinity to this point, what would be the amount of work done on it?
- xx) A point charge of +2 C is transferred from a point at potential 100 V to a point at potential 50 V. What would be the energy supplied by the charge?
- xxi) A capacitor holds 0.06 coulombs of charge when fully charged by a 9 volt battery. Calculate capacitance of the capacitor.
- xxii) A capacitor hold 0.03 coulombs of charge when fully charged by a 6 volt battery. How much voltage would be required for it to hold 2 coulombs of charge?
- xxiii) Two capacitors of capacitances 6 F and 12 F are connected in series with 12 V battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor.
- xxiv) Two capacitors of capacitances 6 F and 12 F are connected in parallel with a 12 V battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor.
- xxv) At 100,000 Ω, how much current flows through your body if you touch the terminals of a 12 V battery?if your skin is wet,so that your resistance is only 1000 Ω, how much current would you receive from the save battery?
- xxvi) A current of 3mA is flowing through a wire for 1 minute.What is a charge flowing through the wire?
- xxvii) The resistance of a conductor wire is 10MΩ.if a potential difference of 100 volts is applied across its ends,then find the value of current passing through it in mA.
- xxviii) By applying a potential difference of 10V across a conductor, a current of 1.5A passes through it. How much energy would be obtained from the current in 2 minutes?
- xxix) Two resistance of 6 kΩ and 12 kΩ are connected in parallel. A 6 V battery is connected across its ends, find the values of the following quantities;
(a)Equivalent resistance of the parallel combination.
(b)Current passing through each of the resistances.
(c)Potential difference across each of the resistance. - xxx) An electric bulb is marked with 220V.100 W. Find the resistance of the filament of the bulb. if the bulb is used 5 hours daily, find the energy in kilowatt-hours consumed by the bulb in one month(30 days).
- xxxi) A transformer is needed to convert a mains 240 V supply in to a 12 V supply. If there are 2000 turns on the primary coil, then find the number of turns on the secondary coil.
- xxxii) A step-up transformer has a turn ratios of 1:100. An alternating supply of 20V is connected across the primary coil.What is the secondary voltage?
- xxxiii) A step-down transformer has a turns ratio of 100:1 An ac voltage of amplitude 170 V is applied to the primary.If the current in the primary is 1.0 mA, what is the current in the secondary?
- xxxiv) The half life of 167 N is 7.3s.A sample of this nuclide of nitrogen is observed for 29.2s. Calculate the fraction of the original radioactive isotope remaining after this time.
- xxxv) Cobalt-60 is a radioactive element with half-life of 5.25 Years.What fraction of the original sample will be left after 26 Years?
- xxxvi) Carbon-14 has a half-life of 5730 Years.How long will it take for the quantity of carbon-14 in a sample to drop to one-eighth of the initial quantity?
- xxxvii) Half-life of a radioactive element is 10 minutes. If the initial count rate is 368 counts per minute, find the time by which, count rate reaches 23 counts per minute.
- xxxviii) A sample of certain radioactive element has a half-life of 1500 Years.If it has an activity of 32000 counts per hour at the present time,then plot a graph of the activity of this sample over the period in which it will reduce to 1/6 of its present value.
- xxxix) Flash of lightning is seen 1.5 seconds earlier than the thunder . How far away is the cloud in which the flash has occured ? ( Speed of sound = 332 ms-1 )
- xl) A student clapped his hands near a cliff and heard the echo after 5 s . What is the distance of the cliff from the student if the speed of the sound is taken as 346 ms-1?
- xli) A sound wave has a frequency of 2 KHz and wavelength 35 cm . How long will it take to travel 1.5 Km ?
- xlii) A convex lens of focal length 6 cm is to be used to form a virtual image three times the size of the object. Where must the lens be placed ?
- xliii) A ray of light from air is incident on a liquid surface at an angle of incidence 350 . Calculate the angle of refraction if the refractive index of the liquid is 1.25 . Also calculate the critical angle between the liquid air interface .
- xliv) Find the value of critical angle of water ( refracted angle = 900 ) . The refractive index of water is 1.33 and that of air is 1.
- xlv) An object is placed 6 cm in front of a concave mirror that has focal length 10 cm . Determine the location of the image ?
- xlvi) An object 10 cm high is placed at a distance of 20 cm from a concave lens of focal length 15 cm . Calculate the position and size of the image . Also state the nature of the image ?
- xlvii) An object 10.0 cm in front of a convex mirror from an image 5.0 cm behind the mirror . What is the focal length of the mirror ?
- xlviii) An object and its image in a concave mirror are the same height , yet inverted when the object is 20 cm from the mirror . What is the focal length of the mirror ?
- xlix) Find the focal length of a mirror that forms an image 5.66 cm behind the mirror of an object placed at 34.4 cm in front of the mirror . Is the mirror concave or convex ?
- l) An image of a state appears to the 11.5 cm behind a convex mirror with a focal length of 13.5 cm. Find the distance from the statue to the mirror ?
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10th Physics SQs
Write short answers to the following questions:
- i) Define Time Period?
- ii) Define the vibration and frequency of a simple pendulum?
- iii) What precautions should be kept in mind while determining the time period of a simple pendulum?
- iv) Describe the relationship between frequency and time parade?
- v) What is the difference between displacement and amplitude?
- vi) What is the difference between frequency and time parade?
- vii) What is meant by frequency?
- viii) Define wave?
- ix) What types of views that do not require a medium for publication? please explain?
- x) Waves are means of energy transfer without transfer of matter ? justify this statement with the help of a simple experiment .
- xi) How many method are there to transfer energy from one place to another?
- xii) What are the basic types of waves write name ?
- xiii) Define the crust and turf?
- xiv) Write an activity that shows that water waves transfer energy without transfer of medium ?
- xv) Define refreaction of waves ?
- xvi) Define the diffraction of wave?
- xvii) Define wave diffraction and wave riffraction?
- xviii) Define incident wave ?
- xix) Define reflection of waves ?
- xx) At one end of the ripple tank 60cm across a7Hz vibrator produces waves whose wavelength is 40 mm .find the time the wave need to across the tank ?
- xxi) What is meant by electronic current?
- xxii) What is the use of galvanometer?
- xxiii) Describe the structure of the ammeter ?
- xxiv) Define volt meter ?
- xxv) What is the difference between a cell and a battery?
- xxvi) Why is the conductors charge is transferred by free electrons rather than by positive charge ?
- xxvii) What is behavior of battery about electric charge ?
- xxviii) How can we come to know that current has been established in the conductor ??
- xxix) What is the difference between current and water flow?
- xxx) Draw schematic diagram of battery as a current source ?
- xxxi) A current of 3mA is flowing though a wire for 1 minute ? what is the charge through the wire ?
- xxxii) When and who invented the first useful battery?
- xxxiii) What is meant by electro motophores? Is it really a force? please explain?
- xxxiv) How we can differnetiate electromotive force and the potential difference?
- xxxv) If 2A current is passing through circuit 60v battery, find its resistance?
- xxxvi) Explain Ohm’s law with an experiment ?
- xxxvii) What is meant by non-essential materials?
- xxxviii) What is meant by thermistor?
- xxxix) Draw a graph between voltage and current for non ohmic materials?
- xl) Describe two features of series combination of resistance ?
- xli) Write two advantages of parallel circuit?
- xlii) Draw a circuit diagram of three resistors in parallel combination?
- xliii) What give us information about circuit diagram of any circuit ?
- xliv) Convert one kilowatt hour in joules?
- xlv) A light bulb is turned on for 40 s. If the electrical energy consumed by the bulb this time is 2400j then find the power of the bulb.
- xlvi) Electric bulbs commonly used in houses consume how much electric power ? give example ?
- xlvii) Write the color (color coding) of live wire and neutral wire?
- xlviii) What was the Democrats’ theory about the atom?
- xlix) Define atomic number and mass number?
- l) What is the difference between Artificial Facial Radio Activity and Natural Radio Activity?
- li) Define a radioactive element and give an example?
- lii) Explain the reason why some elements are radioactive and some elements are not radioactive?
- liii) Is Radioactive a Quick Spontaneous Process? Explain your answer with a simple experiment?
- liv) Who Discovered Radioactivity?
- lv) Write any two properties of alpha particles?
- lvi) Which has more peneatrating power , an alpha particle or a gamma ray photon ?
- lvii) Write a note on the general equation of Alpha D and also write the equation?
- lviii) How much of a 1 g sample of pure radioactivity substance would be left under decayed after four half lives ?
- lix) What is the half-life of radioactive elements and how is it measured? please explain?
- lx) Give two examples of production radioisotopes with chemical equations?
- lxi) Describe the two uses of radioisotopes in medicine?
- lxii) What is metabolism ?
- lxiii) Write the use of radioisotopes as a tracer in agriculture?
- lxiv) Write the use of radioisotopes as a tracer in industry ?
- lxv) Write the half-life of argon 14 and carbon 14?
- lxvi) Write the temperature at the center of the sun?
- lxvii) What do you understand by the longitudinal wave ?
- lxviii) Sound is form of wave . List at least three reasons to support the idea that sound is wave ?
- lxix) Why are sound waves called mechanical waves ?
- lxx) On what factor does frequency of tuning fork depends ?
- lxxi) How does stethoscope work ?
- lxxii) Define intensity of sound ?
- lxxiii) Describe the effect of change in amplitude on loudness ?
- lxxiv) Calculate the intensity level jack hammer ?
- lxxv) Calculate the intensity level of the faintest audible sound of intensity 10-2 Wm-2 ?
- lxxvi) Write name of two charateristics of sound ?
- lxxvii) What is meant by Pitch ?
- lxxviii) Define quality of sound ?
- lxxix) Define resonance ?
- lxxx) Which property of sound wave determine its loudness ?
- lxxxi) What is meant by soundless whistle ?
- lxxxii) Why do we use logarithmic scale to describe the range of the sound intensities we hear ?
- lxxxiii) A student says that the two terms speed and frequency of the wave refer to the same thing . What is your response ?
- lxxxiv) Which factor depend on the frequency of tuning fork ?
- lxxxv) What would happen to the loudness of sound with increase in its frequency ?
- lxxxvi) Which has more penetrating power, all alpha particle or gamma ray photon?
- lxxxvii) Give three reasons to support the evidence that cathode rays are negatively charged electrons.
- lxxxviii) NAND gate is the reciprocal of AND gate.Discuss
- lxxxix) Suppose someone handed you over three similar iron bars and told you one was not a magnet, but the other two were. How would you find the iron bar that was not a magnet?
- xc) From your experience in watching cars on the roads at night, are automobile headlamps connected in series or in parallel.
- xci) Each capacitor in parallel combination has equal potential difference between its two plates . Justify the statement.
- xcii) Define resolving power.
- xciii) Explain why a fish under water appears to be at different depth below the surface than it actually is. Does it appear deeper or shallower?
- xciv) Why or why not concave mirrors are suitable for make up?
- xcv) Why is the driver’s side mirror in many cars convex rather than plane or concave?
- xcvi) When an optician ‘s testing room is small , he used a mirror to help him test the eye sight of his patients. Explain why?
- xcvii) How does the thickness of lens effects its focal length?
- xcviii) Under what conditions will a converging lens forms a real image that is the same size as the object? Show by ray diagram.
- xcix) Why do we use refracting telescope with large objective lens of large focal length?
- c) What is the necessary condition for the production of sound?
- ci) If we clap or speak in front of a building while standing at a particular distance, we rehear our sound after sometime.Can you explain how does this happen ?
- cii) You can listen your friend round a corner , yet you cannot watch him/her . Why?
- ciii) Why must the volume of a stereo in a room with wall to wall carpet be turned higher than in a room with a wooden floor?
- civ) A student says that the two terms speed and frequency of the wave refer to the same thing. What is your response?
- cv) Will two separate 50 dB sound together constitute 100 dB sound? Explain .
- cvi) A ball is dropped from a certain height on to the floor and keeps bouncing . is the motion of the ball simple harmonic? Explain .
- cvii) A student performed two experiments with a simple pendulum. He/ She use two bobs of different masses by keeping other parameters constant .To his / her astonishment the time period of the pendulum did not change ! Why?
- cviii) What types of waves do not require any material medium for their progation?
- cix) What is the speed of sound in air at 250 C ?
- cx) Flash of lighting is seen 2.5 seconds earlier than the thunder . How far away is the cloud in which the flash has occused ? ( Speed of sound = 332 ms-1)
- cxi) Will two separate 50 dB sounds together constitute a 100 dB sound ? Explain .
- cxii) Write audible frequency of the following (1) Mice (2) Cats
- cxiii) What are sign conventions of object distance ?
- cxiv) Define following terms for lenses . (1) Principle axis (2) Optical center
- cxv) Define power of Lens . Write its unit ?
- cxvi) Define with help of diagram double convex lens ?
- cxvii) What is concave – concave lens ? Draw its diagram ?
- cxviii) What is difference between concave and convex lens ?
- cxix) What is meant by principle focus of a Convex and Concave lenses ?
- cxx) Why concave lens called diverging lens ?
- cxxi) Write the focal length of convex and concave lens ?
- cxxii) Write the power of convex and concave lens ?
- cxxiii) Why convex mirror also diverging mirror ?
- cxxiv) Why convex lens called converging lens ?
- cxxv) What is meant by angle of deviation ?
- cxxvi) How we measure angle of deviation ?
- cxxvii) Define total internal reflecting prism ?
- cxxviii) Draw ray diagram for image formation in convex lens when object lies between ” F ” and ” 2F ” ?
- cxxix) What is critical angle ? Write its mathematical form ?
- cxxx) Write the equation of Columb’s law? And what is the value of constant in this?
- cxxxi) What is a point charge?
- cxxxii) Define electric lines of force?
- cxxxiii) In what direction will the postitive charge move in an electron field ?
- cxxxiv) Draw the electric field lines of a negative charge ?
- cxxxv) Define Electric Field Lines and Electric Potential?
- cxxxvi) How many electrons are in coulomb?
- cxxxvii) What is meant by electric field?
- cxxxviii) What is meant by Faraday Cage?
- cxxxix) What is dielectric in a capacitor?
- cxl) Describe the structure with the shape of parallel plate capacitors?
- cxli) Define Capacitance of Capacitor ?
- cxlii) What is meant by electrolyte?
- cxliii) What is a filter circuit?
- cxliv) Why can’t electric bulbs and electric heaters be connected in series?
- cxlv) Find the relationship between a Paico Fred and a Micro Fred?
- cxlvi) What is the difference between capacitor and dielectric?
- cxlvii) What is the effect of increasing of capacitor plates on the charge storing capacity of capacitors ?
- cxlviii) Write two features of series combination of capacitors ?
- cxlix) Define Pole and Radius of curvature of a mirror ?
- cl) What is Spherical mirror ?
- cli) Define center of curvature with diagram ?
- clii) Write two factors that effect the ability of a capacitor to storage charge ?
- cliii) Describe the relation between radius of curvature and focal length ?
- cliv) Define centre of curvature with diagram ?
- clv) Describe the relation between radius of curvature and focal length ?
- clvi) Write the focus of convex and concave mirror ?
- clvii) Write two characteristics of an cancave and a convex mirror ?
- clviii) How can we find the direction of magnetic filed by using right hand ?
- clix) Define electromagnetism?
- clx) Define electromagnetic induction?
- clxi) What are the factors which affect the magnitude of the emf induced in a circuit by a changing magnetic field ?
- clxii) Describe the dierction of an induced e.m.f in a circuit ? How does this phenomenon relate to conservation of energy?
- clxiii) What are the services of different scientists of electromagnetic induction?
- clxiv) Define strength of magnetic fileed ?
- clxv) Define Len’z law ?
- clxvi) How can we tell about the nature of image and the size of image compared with size of object ?
- clxvii) What is difference between incident ray and reflected ray ?
- clxviii) Define Refraction of light ?
- clxix) A ray of light enters from air into glass surface . The angle of incidence is 600 . If the refractive index of glass is 1.52 then find the angle of refraction .
- clxx) Define refraction . Explain with diagrams ?
- clxxi) Whether the bending of light be more or less for a medium with high refractive index ?
- clxxii) A ray of light enters from air into glass surface . The angle of incident is 300 and angle of refraction is 19.30 , then find refractive index of glass .
- clxxiii) Write down the working of transformer?
- clxxiv) What is ideal transformer? and what is the condition for transformer to become ideal?
- clxxv) Define Telecommunication ?
- clxxvi) Define information and communication technology ?
- clxxvii) Write the names of the components of Computer Based Information System ( CBIS ) ?
- clxxviii) What is meant by not gate?draw its symbol ?
- clxxix) How many inputs and outputs of not gate ?
- clxxx) Define optical fibre ?
- clxxxi) Define operating system and give example ?
- clxxxii) What are four possible conditions of parallel fitted switches? Imagine both switches being inputs?
- clxxxiii) How many inputs and outputs of OR gate ?
- clxxxiv) Write down two uses of internet ?
- clxxxv) What is meant by global web ?
- clxxxvi) For what purpose browsers are used ?
- clxxxvii) Write four advantage of E-mail ?
- clxxxviii) What is E-commerce ?
- clxxxix) Make the symbol diagram and Truth table and AND gate ?
- cxc) Define Truth Table?
- cxci) What is meant by logical states ?
- cxcii) What are the three Universal Logic Gates?
- cxciii) What do you know about digital circuits?
- cxciv) What is meant by logical gates?
- cxcv) Assume you have an OR gate with two inputs A and B . Determine the output C , if A = 0 , B = 1
- cxcvi) What is NOR gate ? Draw its symbol .
- cxcvii) State mathematical formula of NOR gate ?
- cxcviii) Write the formation of NOT gate from NAND and NOR gates with the resultant truth tables ?
- cxcix) Draw graph of a digital signal ?
- cc) How NAND gate is made ? Write a symbolic representation of NAND gate ?
Form More Tests: Click Here
10th Chemistry MCQs
- Encircle the Correct Option.
- 1) When a system is in equilibrium state or in dynamic equilibrium state.
| a) Reactants and product are equal | b) Reverse reactions stops | c) Forward reactions stops | d) Forward reaction rate and reverse reaction rate becomes equal |
- 2) The reversible reaction is represented by.
| a) → | b) | c) | d) |
- 3) In the beginning the rate of reverse reaction is .
| a) Slow | b) Very Fast | c) Moderate | d) Negligible |
- 4) On heating hydrogen and iodine vapour in a closed flask ————— is formed.
| a) Flask | b) Hydrogen Iodine | c) Hydrogen gas | d) Respiration |
- 5) When reaction ceases to proceed , it is called.
| a) Irreversible | b) Forward | c) Static | d) Chemical |
- 6) At initial stage , the rate of forward reaction is.
| a) Fast | b) Heavy | c) Light | d) Slow |
- 7) We exhale gas in the atmosphere during respiration.
| a) Water | b) Nitrogen | c) Oxygen | d) Carbon dioxide |
- 8) Colour of iodine is
| a) Green | b) yellow | c) purple | d) black |
- 9) A reverse reactions is that.
| a) Which proceed from left to right | b) In which reactants reacts to form products | c) Which speed up gradually | d) Which slow down gradually |
- 10) When nitrogen react with oxygen ,it make .
| a) Hydrogen oxide | b) Nitrogen mono oxide | c) Both a,b | d) Non of these |
- 11) Which one of the following statements is not correct about active mass ?
| a) A rate of reaction is directly proportional to active mass | b) Active mass is taken in moler concentrations | c) Active mass is represented by square brackets | d) Active mass means total mass of substances |
- 12) The characteristics of reversible reactions are the following except :
| a) They never complete | b) They proceed in both ways | c) Products never recombine to from reactants | d) They have a double arrow between reactants and products |
- 13) The value of Kc depends only on :
| a) Temperature | b) Oxygen | c) Hydrogen | d) Gases |
- 14) How many units has in reactions with equal number of moles on both sides of equation ?
| a) 1 | b) 2 | c) 3 | d) No units |
- 15) Glucose is polymerizes to forms —–
| a) Starch | b) cellulose | c) Proteins | d) Starch and cellulose |
- 16) Which one is the following penta hydroxy oxide?
| a) Glucose | b) Fructose | c) Maltose | d) Lactose |
- 17) Which of the following is disuccharicles
| a) Glucose | b) Lactose | c) Maltose | d) Fructose |
- 18) Which sugar is found in cereals ?
| a) glucose | b) lipids | c) sucrose | d) maltose |
- 19) Which of the following helps the intestines to function properly?
| a) Proteins | b) Lipids | c) Dietary fibers | d) RNA |
- 20) Building blocks of proteins?
| a) Lipids | b) Amino acids | c) Glucose | d) Cellulose |
- 21) How many amino acid are?
| a) 10 | b) 20 | c) 30 | d) 40 |
- 22) Essential amino acids are ?
| a) 10 | b) 20 | c) 30 | d) 34 |
- 23) Non-essential amino acids are ?
| a) 13 | b) 12 | c) 11 | d) 10 |
- 24) Number of amino acids in proteins :
| a) 1000 | b) Less than 10,000 | c) More than 10,000 | d) 2000 |
- 25) Lipids macro molecules are made of?
| a) Proteins | b) Amino acids | c) Fatty acids | d) Carbohydrate rates |
- 26) At which temperature margarine is produced by adding hydrogen to vegetables oil ?
| a) 150 | b) 200 | c) 100 | d) 250 |
- 27) The passage of hydrogen in the stench of stale butter forms margarine:
| a) Sulfuric acid | b) Nitric acid | c) Hydrochloric acid | d) Butanoic acid |
- 28) Which one of the following is fertilizer ?
| a) Sodium hydroxide | b) Washing soda | c) Urea | d) NaCl |
- 29) The process of removal of gangue from are is called :
| a) Smelting | b) Roasting | c) Refining of metal | d) Concentration of ore |
- 30) Identify the matte ?
| a) CuO.FeS | b) SeF.S2uC | c) OeF.SeF | d) O4sSuC |
- 31) How many method are use for concentration of ore ?
| a) 1 | b) 2 | c) 3 | d) 4 |
- 32) Solvay’s process to use for the manufacturing of ——–.
| a) NaOH | b) Na2CO3 | c) NaCl | d) NaHCO3 |
- 33) Chemical formula of lime stone is :
| a) NaHCO3 | b) NaCl | c) Na2CO3 | d) CaCO3 |
- 34) When NaHCO3 is heated if forms :
| a) NaHCO3 | b) NaCl | c) Na2CO3 | d) CO2 |
- 35) The chemical formula of urea is :
| a) HNOCN2H | b) O2NOC4 | c) HN3 | d) 4HN |
- 36) Ammonia is prepared by :
| a) Solvay’s process | b) Haber’s process | c) Flotation process | d) Bayer process |
- 37) How many units are in Pakistan for manufacturnig of urea
| a) 3 | b) 5 | c) 7 | d) 6 |
- 38) Urea is nitrogenous fertilizer. It contain of nitrogen?
| a) 46.6% | b) 33% | c) 44% | d) 23% |
- 39) Which one of the following are amorphous solids ?
| a) Glucose | b) Monosaccharides | c) Polysacharides | d) Maltese |
- 40) What is the molecular formula of fructose?
| a) 6O12H6C | b) H6C6 | c) NCL | d) H2O |
- 41) The body reactions are catalized by :
| a) amino acids | b) lipds | c) enzymes | d) fatty acids |
- 42) What is the molecular formula of palmitic acid?
| a) O11H12C10 | b) HOOC30H5C | c) HOOC31H15C | d) HOOC35H17C |
- 43) What is the molecular formula of citric acid?
| a) HOOC35H17C | b) HOOC30H5C | c) O11H12C10 | d) H35C17 |
- 44) Amino acids are linked to each other :
| a) Hydrogen link | b) Ionic link | c) Cheltenham link | d) Peptide link |
- 45) ——– is use for the cleaning of swiming pools ?
| a) Cl | b) Br | c) l | d) F |
- 46) Which salts present in detergents cause rapid growth of algae in water ?
| a) Sodium | b) Phosphate | c) Calcium | d) None of these |
- 47) Which one of the following protects teethes from decay ?
| a) Fluorine compound | b) Chlourine compound | c) Both A & B | d) None of these |
- 48) Rapid growth of algae in water bodies is because of detergent having :
| a) Carbonat salts | b) Sulphonic acid | c) Sulphat salts | d) Phosphate salt |
- 49) The chemicals used to kill pests are called pesticides .they are ?
| a) Dangerous inorganic chemicals | b) Dangerous organic chemicals | c) Beneficial organic chemicals | d) Beneficial inorganic chemicals |
- 50) How many Types of Water Hardness ?
| a) 2 | b) 3 | c) 4 | d) 5 |
- 51) Which one of the following produce permanent hardness in water ?
| a) CaCO2 | b) CO2 | c) O2 | d) MgSO4 |
- 52) Which of the following is not soluble in water ?
| a) H6C6 | b) NaCl | c) KCl | d) O2 |
- 53) Which of the following is soluble in water ?
| a) NaCl | b) O2 | c) KCl | d) H2O |
- 54) Water molecule has a structure .
| a) Ionic | b) Non – polar | c) Tetrahedrad | d) Polar |
- 55) The temperature range at the troposphere is:
| a) 17oC to – 58oC | b) 15oC to – 60oC | c) 10oC to – 58oC | d) 17oC to – 60oC |
- 56) Above the troposphere the layer lies is called:
| a) Thermosphere | b) Strosphere | c) Mesosphere | d) Hardosphere |
- 57) The stratosphere layer is extended up to:
| a) 15 km | b) 50 km | c) 100 km | d) 25 km |
- 58) A lot of efforts are being made world wide to control the _________ effects of pollution.
| a) positive | b) negative | c) changing | d) pleasant |
- 59) Ozone layer absorbs high energy radiations from the Sun called:
| a) Infrared radiations | b) Ultra visible reactions | c) Visible radiations | d) Ultraviolet radiations |
- 60) The formula of ozone is:
| a) O | b) O2 | c) O3 | d) O4 |
- 61) Ozone layer usually exist at the __________ of stratosphere.
| a) top | b) mid | c) lower | d) whole region |
- 62) Forest fires and burning of wood emit:
| a) CO2 and O2 | b) CO and N2 | c) O3 and | d) CO2 and CO |
- 63) Global warming causes rising of the sea level. The cause of global warming is:
| a) CO2 gas | b) SO2 gas | c) NOxgas | d) O3 gas |
- 64) What is the pH of acid rain?
| a) 1 | b) 2 | c) 3 | d) 4 |
- 65) The pH of normal rain water is:
| a) 5.6 to 7 | b) 6 to 7 | c) 7 to 9 | d) 6.5 to 6 |
- 66) Acid rain affects the aquatic life by clogging fish gills because of:
| a) Lead metal | b) Chromium metal | c) Mercury metal | d) Aluminium |
- 67) Acid rain attacks the _________ present in the marble and _________ of buildings and monuments.
| a) CaCO3, limestone | b) CaO, CaOH | c) CaCO3, CaO | d) CaO, CaOH2 |
- 68) Building are being damaged by acid rain because it attacks:
| a) Calcium sulphate | b) Calcium nitrate | c) Calcium carbonate | d) Calcium oxalate |
- 69) Which of the following is a heavy metal?
| a) Al,Hg | b) Hg, Pb | c) Al,CO | d) Na. Mg |
- 70) The pH of normal rain water is:
| a) 5.6 to 7 | b) 6 to 7 | c) 7 to 9 | d) 5.6 to 6 |
- 71) What is the pH of acid rain?
| a) 1 | b) 2 | c) 3 | d) 4 |
- 72) Acid rain affects the aquatic life by clogging fish gills because of:
| a) Lead metal | b) Chromium metal | c) Mercury metal | d) Aluminium metal |
- 73) Acid rain attacks the _________ present in the marble and _________ of buildings and monuments.
| a) CaCO3, limestone | b) CaO, CaOH | c) CaCO3, CaO | d) CaO, CaOH2 |
- 74) Effects of ozone depletion are following except the one.
| a) increases infectious diseases | b) increases crops production | c) can cause skin cancer | d) can cause climatic changes |
- 75) Depletion of ozone causing:
| a) infectious disease | b) changing life cycle of plants | c) changes the wind patterns | d) all of above |
- 76) Decreased ozone layer ___________ infections diseases like malaria.
| a) decreases | b) increases | c) reduces | d) limits |
- 77) The region in which ozone layer depletes is called:
| a) Ozone depletion | b) Ozone hole | c) Ozone filtration | d) Ozone decomposition |
- 78) Ozone is present throughout the:
| a) environment | b) universe | c) air | d) atmosphere |
- 79) How many bond make by hydrocarbons of each carbon atom?
| a) 5 | b) 4 | c) 3 | d) 9 |
- 80) Hydrocarbons are compounds made up of only ——- elements?
| a) Oxygen and carbon | b) Carbon and hydrogen | c) Nitrogen and oxygen | d) Sulfur and hydrogen |
- 81) Which is regraded as the parent organic compounds ?
| a) Salts | b) Hydrocarbons | c) Bases | d) Oxides of metals |
- 82) Which is not true about hydrocarbons?
| a) Composed of carbon and hydrogen only | b) Divided into four general classes | c) They are may be saturated or unsaturated | d) Oxygen is the main element of them |
- 83) Alkenes are____________ hydrocarbons.
| a) none polar | b) flammable | c) insoluble in water | d) all of above |
- 84) Halogenation of methane produces follwing valuable chemical compounds used as solvents except:
| a) gobar gas | b) sewage gas | c) bio gas | d) all the above |
- 85) Boiling point of alcohol in centigrade is :
| a) 68 | b) 78 | c) 118 | d) 128 |
- 86) The end product of oxidation of acetylene :
| a) Propane Glycol | b) Etienne Glycol | c) Glyoxal | d) Oxalic acid |
- 87) The functional group -COOH is found in :
| a) Carboxylic acids | b) Aldehydes | c) Alcohols | d) Easter |
- 88) Hydrocarbon compounds which consisting of double bonds between carbon atom in their molecules are called as ?
| a) Alkenes | b) Alkynes | c) Alkyle | d) Alkanes |
- 89) Alkanes form the most important —– series of compounds called ?
| a) Medicines | b) Homologous series | c) Functional groups | d) All this |
- 90) Alkyl is made up of ?
| a) hydrogen | b) Alkanes | c) Alkenes | d) Alkynes |
- 91) The general formula of alkynes ?
| a) CnH2n | b) CnH2n-3 | c) CnH2n | d) CnH2n+ |
- 92) General formula of Alkane is :
| a) C2H2 | b) HO3CH | c) C4H2 | d) C3H2 |
- 93) A compound represents the exact arrangement of the different atoms of various elements present in a molecule of substance ?
| a) Molecular formula | b) Structural formula | c) Condensed formula | d) Dot and cross formula |
- 94) The condensed formula of octane ?
| a) H2C5 | b) H8C3 | c) H3C5(2HC)C3H | d) H3C6(H2C)CH3 |
- 95) Organic compound have been boradly divided into —- categories depending upon their skeleton ?
| a) 2 | b) 3 | c) 4 | d) 5 |
- 96) The colour of Ca(OH)2 is ?
| a) Blue | b) Green | c) White | d) Red |
- 97) What is the pH of basic solutions ?
| a) Less then 7 | b) Greater then 7 | c) Equal to 7 | d) None of these |
- 98) What are the values of pH?
| a) 0-14 | b) 1-14 | c) 7-14 | d) 10-14 |
- 99) The product of Lewis acid-base reaction is called adduct. The bond between the adduct species is:
| a) Ionic | b) Covalent | c) Metallic | d) Coordinate covalent |
- 100) What is the pOH of a 0.02M Ca(OH)2?
| a) 1.698 | b) 1.397 | c) 12.31 | d) 12.61 |
- 101) A solution of a compound of pH = 7 or pOH = 7 is considered a:
| a) Acid | b) Basic | c) Neutral | d) None of these |
- 102) Salts are —– compound .
| a) Basic | b) Soft | c) Acidic | d) Ionic |
- 103) In which shape salts are found ?
| a) Solid | b) Golden | c) Crystalline | d) Silver |
- 104) The melting and boiling points of salts are :
| a) Very low | b) Very High | c) Moderate | d) same |
- 105) All water soluble metallic oxides turn red litmus ……….. :
| a) Yellow | b) Blue | c) Black | d) Purple |
- 106) The Chemical formula used for calcium hydroxide bases .
| a) Ca(HO) 2 | b) Al(HO)3 | c) H2O | d) O2 |
- 107) With ( NH3 ) Amunia water react as ________
| a) Acid | b) Base | c) Salt | d) None of these |
- 108) What is the conjugate base of HF :
| a) F– | b) F+ | c) K– | d) K+ |
- 109) The base used for the treatment of bee’s sting is :
| a) KOH | b) OH | c) O2 | d) NaOH |
- 110) The characteristics of reversible reactions are the following except:
| a) products never recombine to from reactants | b) they never complete | c) They proceed in both ways | d) they have a double arrow between reactions and products |
- 111) In the lime kiln, the reaction CaCO3(s)———> CaO(s)+CO2(g)
goes to completion because:
| a) of high temperature | b) CaO is more stable than CaCO3 | c) CO2 escapes continuously | d) CaO is not dissociated |
- 112) When the magnitude of Kc is very small it indicates:
| a) equilibrium will never establish | b) all reactants will be converted to products | c) reaction will go to completion | d) the amount of products is negligible |
- 113) Reactions which have comparable amounts of reactants and products at equilibrium state have:
| a) very small Kc value | b) very large Kc value | c) moderate Kc value | d) None of these |
- 114) At dynamic equilibrium:
| a) The reaction stops to proceed | b) The amounts of reactants and products are equal | c) The speeds of the forward and reverse reactions are equal | d) The reaction can no longer be reversed |
- 115) A reverse reaction is one that:
| a) which proceed from left to right | b) in which reactants react to from products | c) which slows down gradually | d) which speeds up gradually |
- 116) Nitrogen and hydrogen were reacted together to make ammonia:
N2 + 3H2 ⇋ 2NH3 Kc= 2.86 mol-2 dm6
What will be present in the equilibrium mixture?
| a) NH3 only | b) N2, H2 and NH3 | c) N2 and H2 only | d) H2 only |
- 117) Carbohydrates are synthesized by plants through photosynthesis process which requires the following except:
| a) CO2 and water | b) Presence of sunlight | c) O2 | d) Chlorophyll |
- 118) Which of the following is a disaccharide?
| a) glucose | b) fructose | c) sucrose | d) starch |
- 119) Thousand of amino acids polymerize to form:
| a) carbohydrates | b) proteins | c) lipids | d) vitamins |
- 120) Which one of the following is a triglyceride?
| a) carbohydrates | b) proteins | c) lipids | d) vitamins |
- 121) Enzymes are proteins which have the following properties except:
| a) they catalyze reaction | b) they are highly non-specific | c) they are highly efficient | d) they are produced by living cells |
- 122) Which one of the following vitamins is lipid soluble?
| a) vitamin A | b) vitamin C | c) vitamin D | d) vitamin E |
- 123) Which one of the following is a fat soluble vitamin?
| a) A | b) K | c) E | d) all of these |
- 124) Which one of the following statements about glucose and sucrose is incorrect?
| a) soluble in water | b) naturally occurring | c) carbohydrates | d) disaccharides |
- 125) Which one of the following not a reducing sugar?
| a) glucose | b) maltose | c) sucrose | d) starch |
- 126) The most important oligosaccharide is:
| a) sucrose | b) glucose | c) fructose | d) maltose |
- 127) Night blindness is because of deficiency of۔۔۔vitamin
| a) vitamin A | b) vitamin C | c) vitamin D | d) vitamin E |
- 128) The organic compounds used as drugs to control bleeding are:
| a) vitamins | b) proteins | c) lipids | d) glycerides |
- 129) Lipids are macromolecules. They have characteristics except one of the following:
| a) They are high energy foods | b) They are soluble in water | c) They are poor conductor of heat | d) They are esters of fatty acids |
- 130) Which one of these hydrocarbon molecules would have no effect on an aqueous solution of bromine?
| a) CH4 | b) C10H20 | c) C2H4 | d) C2H2 |
- 131) Alkenes are prepared from which alcohols process?
| a) dehydrogenation | b) dehalo genation | c) dehydration | d) dehydrohalogenation |
- 132) Dehydro halogenation takes place in the presence of:
| a) NaOH aqueous | b) alcoholic KOH | c) aqueous of KOH | d) alcoholic NaOH |
- 133) Oxidation of ethene with KMnO4 produces :
| a) oxalic acid | b) glyoxal | c) ethane glycol | d) propene glycol |
- 134) Which one of these is a saturated hydrocarbon?
| a) C2H4 | b) C3H6 | c) C4H8 | d) C4H8 |
- 135) A hydrocarbon has molecular formula C8H14. What is the molecular formula of the next member of the same homologous series?
| a) C9H18 | b) C9H16 | c) C9H20 | d) C9H12 |
- 136) The molecular formula of the first three members of the alkane hydrocarbons are CH4, C2H6 and C3H8. What is the molecular formula for the eighth alkane member, octane, which is found in petrol?
| a) C8H8 | b) C8H16 | c) C8H18 | d) C8H20 |
- 137) Dehydration of alcohol can be carried out with:
| a) NaOH | b) KOH | c) H2SO4 | d) HCl |
- 138) The end product of oxidation of acetylene is:
| a) oxalic acid | b) glycol | c) glyoxal | d) none of these |
- 139) Substitution reaction is the characteristics of:
| a) alkanes | b) alkenes | c) alkynes | d) none of these |
- 140) Halogenation of methane in the presence of diffused sunlight takes place:
| a) suddenly, only in one step | b) slowly in one step | c) in a series of four steps | d) fastly in two steps |
- 141) Which one of the followings is a substitution reaction?
| a) halogenation of alkynes | b) halogenation of alkenes | c) halogenation of alkanes | d) bromination of alkenes |
- 142) Oxidation of alkenes produce:
| a) glyoxal | b) glycol | c) oxalic acid | d) formic acid |
- 143) Halogenation of methane does not produce which one of the follwing:
| a) carbon tetrachloride | b) chloroform | c) carbon black | d) chloromethane |
- 144) The ability of carbon atoms to form chains is called:
| a) Isomerism | b) Catenation | c) Resonance | d) Condensation |
- 145) The strong heating of coal in retorts in the absence of air is called:
| a) Fractional distillation | b) Sublimation | c) Roasting | d) Destructive distillation |
- 146) Pitch is black residue of:
| a) Coke | b) Coal-tar | c) Coal | d) Coal gas |
- 147) Natural gas is 85% methane. It is used make the following except
| a) Carbon black | b) Coke | c) Coal tar | d) Coal gas |
- 148) Which one of the following does not contain starch.
| a) Sugar cane | b) Maize | c) Barley | d) Potatoes |
- 149) In laboratory urea was prepared by:
| a) Wholer | b) Rutherford | c) Berzellius | d) Dalton |
- 150) Identify which one of the following compounds is a ketone:
| a) (CH3)2 CHOH | b) (CH3)2 CO | c) (CH3)2 NH | d) (CH3)2 CHCl |
- 151) The functional group -COOH is found in:
| a) carboxylic acid | b) aldehydes | c) alcohols | d) esters |
- 152) Carbonization process is the conversion of:
| a) coal into coal gas | b) coal into wood | c) wood into coal | d) wood into coal tar |
- 153) Coal gas is a mixture of:
| a) CO and CH4 | b) CO, CH4, CO | c) CO2, CH4, H2 | d) CO, H2 and CO2 |
- 154) Which one of the following is a synthetic fibre?
| a) cotton | b) wool | c) nylon | d) silk |
- 155) Which one of the following is not a fossil fuel?
| a) coal | b) natural gas | c) biogas | d) petroleum |
- 156) Conversion of dead plants into coal by the action of bacteria and heat is called:
| a) carbonization | b) catenation | c) hydrogenation | d) cracking |
- 157) Which one of the following compounds is an aldehyde?
| a) CH3-CH2-OH | b) CH3-COOH | c) CH3-CHO | d) CH3COCH3 |
- 158) Lewis acid-base concept have the following characteristics except:
| a) formation of an adduct | b) formation of a co-ordinate covalent bond | c) donation and acceptance of an electron pair | d) donation and acceptance of a proton |
- 159) Acetic acid is used for:
| a) flavouring food | b) making explosive | c) etching designs | d) cleaning metals |
- 160) In the preparation of insoluble salts, which one of the facts is incorrect
| a) two soluble salts are mixed | b) two soluble salts are produced | c) one of the salts produced is insoluble | d) both of the salts produced are insoluble |
- 161) A reaction between an acid and a base produces:
| a) salt and water | b) salt and gas | c) salt and an acid | d) salt and a base |
- 162) What is the pOH of a 0.02M Ca(OH)2?
| a) 1.698 | b) 1.397 | c) 12.31 | d) 12.61 |
- 163) Which one of the following species is not amphoteric?
| a) H2O | b) NH3 | c) HCO–3 | d) SO2-3 |
- 164) The product of Lewis acid-base reaction is called adduct. The bond between the adduct species is:
| a) ionic | b) covalent | c) metallic | d) coordinate covalent |
- 165) The water of crystallization is responsible for the:
| a) melting points of crystals | b) boiling points of crystals | c) shapes of crystals | d) transition point of crystals |
- 166) You want to dry a gas which one of the following salt you will use:
| a) CaCl2 | b) NaCl | c) CaO | d) Na2 SiO3 |
- 167) Ferric hydroxide (Fe(OH)3)is precipitated out of solution when aqueous sodium hydroxide solution is added to ferric chloride (FeCl3).
FeCl3(eq) + 3NaOH(aq)——-> Fe(OH)3(s) + 3NaCl(aq)
Colour of the precipitate is:
| a) white | b) blue | c) dirt green | d) brown |
- 168) According to the Lewis concept, acid is a substance which can:
| a) donate a proton | b) donate a pair of electron | c) accept a proton | d) accept a pair of electron |
- 169) Matte is a mixture of:
| a) FeS and Cus | b) Cu2O and FeO | c) Cu2S and FeS | d) CuS and FeO |
- 170) In the bessemerization process:
| a) Roasted ore is heated | b) Molten matte is removed | c) Molten matte is heated | d) Molten matte is added |
- 171) Concentration of the copper ore is carried out by:
| a) Calcinations | b) Roasting | c) Forth flotation | d) Distillation |
- 172) When NaHCO3 is heated it forms:
| a) CO2 | b) Ca(OH)2 | c) CaCO3 | d) CaO |
- 173) Crude oil is heated in the fractionating furnace up to:
| a)
300oC |
b) 350oC | c) 400oC | d) 450oC |
- 174) When crude oil is heated in the fractionating tower:
| a) Vapours of higher boiling point fraction condense first in the lower part of the tower. | b) Vapours of lower boiling point fraction condense first in the lower part of the tower. | c) Vapours of higher boiling point condense later in the upper part of the tower. | d) Vapours of higher boiling point never condense. |
- 175) Which one of the following fraction is used as jet fuel:
| a) Kerosene oil | b) Lubricating oil | c) Fuel oil | d) Diesel oil |
- 176) Which one of the following is not a fraction of petroleum?
| a) Kerosene oil | b) Diesel oil | c) Alcohol | d) Petrol |
- 177) In solvay’s process slaked lime is used to:
| a) prepare CO2 | b) prepare quick lime | c) recover ammonia | d) form Na2CO3 |
- 178) Residual oil gives the following fractions except:
| a) paraffinn water | b) asphalt | c) fuel oil | d) petroleum coke |
- 179) Water dissolves non-ionic compound by:
| a) ion-ion forces | b) ion-dipole forces | c) dipole-dipole forces | d) hydrogen bonding |
- 180) Temporary hardness is because of:
| a) Ca(HCO3)2 | b) CaCO3 | c) MgCO3 | d) MgSO3 |
- 181) Temporary hardness is removed by adding:
| a) quick lime | b) slaked lime | c) limestone | d) lime water |
- 182) Permanent hardness is removed by adding:
| a) Na2 zeolite | b) soda lime | c) lime water | d) quick lime |
- 183) Depletion of O2 from water is not because of:
| a) decaying of aquatic plants | b) biodegradation of aquatic plants | c) rapid growth of aquatic plants | d) decomposition of aquatic plants |
- 184) Rapid growth of algae in water bodies is because of detergent having:
| a) carbonate salts | b) sulphonic acid salts | c) sulphate salts | d) phosphate salts |
- 185) Which one of the following ions does not cause hardness in water?
| a) Al+3 | b) Mg2+ | c) Fe+2 | d) Na+ |
- 186) A disease that causes bone and tooth damage is:
| a) flourosis | b) hepatitis | c) cholera | d) jaundice |
- 187) The chemicals used to kill or control pests are called pesticides.
They are:
| a) dangerous inorganic chemicals | b) dangerous organic chemicals | c) beneficial inorganic chemicals | d) beneficial organic chemicals |
- 188) which one of the following salts makes the water permanently hard?
| a) Na2CO3 | b) NaHCO3 | c) Ca(HCO3)2 | d) CaSO4 |
- 189) Depending upon temperature variation, atmosphere is divided into how many regions?
| a) one | b) two | c) three | d) four |
- 190) Just above the Earth’s surface is:
| a) Mesosphere | b) Stratosphere | c) Thermosphere | d) Troposphere |
- 191) A group of gases that maintains temperature of atmosphere is:
| a) Carbon dioxide and water vapours | b) Nitrogen and carbon dioxide | c) Oxygen and water vapours | d) Nitrogen and oxygen |
- 192) The Earth’s atmosphere is getting hotter because of:
| a) Increasing concentration of CO | b) Increasing concentration of CO2 | c) Increasing concentration of O3 | d) Increasing concentration of SO2 |
- 193) Which one of the following is not a Greenhouse Effect?
| a) Increasing atmosphere temperature | b) Increasing food chains | c) Increasing flood risks | d) Increasing sea-level |
- 194) Normally rain water is weakly acidic because of:
| a) SO3 gas | b) CO2 gas | c) SO2 gas | d) NO2 gas |
- 195) Building are being damaged by acid rain because it attacks:
| a) Calcium sulphate | b) Calcium nitrate | c) Calcium carbonate | d) Calcium oxalate |
- 196) Effects of ozone depletion are following except the one.
| a) increases infectious diseases | b) increases crops production | c) can cause skin cancer | d) can cause climatic changes |
- 197) Which one of these pollutants are not found in car exhaust fumes?
| a) CO | b) O3 | c) NO2 | d) SO2 |
- 198) Carbon monoxide is harmful to us because:
| a) it damages lungs tissues | b) it paralyses the lungs | c) it reduces oxygen carrying ability of haemoglobin | d) it makes the blood coagulate |
- 199) About 99% atmosphere’s mass lies whit in;
| a) 30 kilometre | b) 35 kilometre | c) 15kilometre | d) 11kilometre |
- 200) Acid rain effects the aquatic life by clogging fish gills because of:
| a) lead metal | b) chromium metal | c) mercury metal | d) aluminium metal |
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10th Chemistry LQs & Numericals
Answer the Following Long Questions
- i) Write four macroscopic properties of forward reaction ?
- ii) Compare the macroscopic characteristics of forward and reverse reactions ?
- iii) State the law of mass action and derive the expression for equilibrium constant for general reaction ?
- iv) Define fatty acids? Write their formulas with two examples?
- v) Describe smelting process used for the ectraction of metal from concentrated ore ?
- vi) Write the detail of smelting by diagram and chemical reaction ?
- vii) Describe the Ammonia Recovery Tower ?
- viii) Write four chemical reactions in ammonia Solvay’s process ?
- ix) How is urea manufactured ? Explain the flow sheet diagram ?
- x) Write four uses of Calcium Oxide ?
- xi) Explain Lowery Bronsted concept of Acids and Bases ?
- xii) Write down any four characteristics of Salts ?
- xiii) Explain with examples how soluble salts are prepared ?
- xiv) Find the pH of 0.1MKOH ?
- xv) Write a detailed note on the classification of organic compounds?
- xvi) Describe four types of formula of organic compounds?
- xvii) Write four characteristics of organic compounds of the same homologous series?
- xviii) Describe characteristics of homologous series?
- xix) What is amines? Explain the different types by giving examples? How primary amino group identified?
- xx) Write a note on halaogenation of alkanes ?
- xxi) Describe the three physical properties of Alkenes?
- xxii) Describe two methods of preparation of alkenes?
- xxiii) Write the properties of the troposphere. Why temperature increases upward in this sphere ?
- xxiv) What is acid rain and how it is formed ?
- xxv) What is Ozone ? How and where it is formed ?
- xxvi) Write a note on polar nature of water ?
- xxvii) Explain that water is a universal solvent ?
- xxviii) Describe the causes of permanent hardiness ?
- xxix) Write down four effects of water pollution ?
- xxx) Explain the agricultural effluents are fetal for aquatic life ?
- xxxi) What is water pollution? Explain the effects of using polluted water.
- xxxii) Write about cholera and crypto sporidium ?
- xxxiii) Write law of mass action and derive equilibrium constant expression a general reaction ?
- xxxiv) What is the importance of equilibrium constant?
- xxxv) What are carbohydrates? How monosaccharides are prepared? Give their characteristics.
- xxxvi) Give the importance of vitamins.
- xxxvii) Give chemical reactions of alkenes?
- xxxviii) Describe the functional group of an alcohol. How are alcoholic groups identified?
- xxxix) Give some uses of organic compounds in our daily life.
- xl) What are amines? Explain the different types of amines giving an example of each type. How primary amino group is identified?
- xli) Define an acid and a base according to Bronsted-Lowry concept and justify with examples that water is an amphoteric compound.
- xlii) Define a salt and give the characteristic properties of salts.
- xliii) Write a note on fractional distillation of petroleum.
- xliv) Explain the methods of removing Hardness.
- xlv) Justify the statement ” Household water is the reason of water pollution”
- xlvi) Water is considered universal solvent ,explain its reasons ?
- xlvii) Define Acid rain.How it forms and what are its effects?
- xlviii) Are Oxides of Nitrogen cause air pollution? Describe the sources of these compounds?
- xlix) Why CO is considered threat for health ?
- l) What are the characteristics of stratosphere? Why does temperature increase upwards in this sphere?
Answer the Following Questions
- i) For the decomposition of dinitrogen oxide ( N2O ) into nitrogen and oxygen reversible reaction takes places as follows:
2N2O(g) 2N2(g) + O2(g)
The concentration of N2O , N2 and O2 are 1.1 mol dm-3 , 3.90 mol dm-3 and 1.95 mol dm , respectively at equilibrium . Find our Kc for this reaction. - ii) Hydrogen iodide decomposes to form hydrogen and iodine . If the equilibrium concentration of HI is 0.078 mol dm-3, H2and I2 is same 0.011 mol dm-3 . Calculate the equilibrium constant value for this reversible reaction.
- iii) For the fixation of nitrogen following reaction takes place.
2N2O(g) 2N2(g) + O2(g)
When the reaction takes place at 1500 K , the Kc for this is 1.1 × 10-5 . If equilibrium concentrations of nitrogen and oxygen are 1.7 × 10-3 mol dm-3 and 6.4 × 10-3 mol dm-3 , respectively , how much NO is formed ? - iv) When nitrogen reacts with hydrogen to form ammonia , the equilibrium mixture contains 0.31 mol dm-3and 0.50 mol dm-3of nitrogen and hydrogen respectively . If the Kc is 0.50 mol-2 dm6 , what is the equilibrium concentration of ammonia ?
- v) Calculate the pH of 0.1 M KOH?
- vi) Calculate the pH and pOH of 0.2 M H2SO4?
- vii) Calculate the pOH of 0.004 M HNO3 ?
10th Chemistry SQs
- Short Questions / ANswers
- i) Different between forward and reverse reaction with the example ?
- ii) Write down the expression of Kcfor a general reversible reaction ?
- iii) How Dynamic equilibrium established ?
- iv) What are reversible reaction ? In which condition they take place ?
- v) What are macroscopic characteristics of dynamic equilibrium ? Write any four .
- vi) Why the amounts of reactions and products do not change in a reversible reactions ?
- vii) Which quantities increase and decrease during forward reactions ?
- viii) Why the reversible reactions do not go to completion ?
- ix) Write two possibilities of chemical equilibrium state ?
- x) Environmental systems depends upon equilibrium phenomenon. Give an example ?
- xi) Describe some properties of reversible reaction ?
- xii) Compare macroscopic properties of forward and reverse reactions ?
- xiii) Differentiate between static equilibrium and dynamic equilibrium ?
- xiv) Write are Rf and Rr ?
- xv) What is meant by equilibrium Constant? Give an example?
- xvi) Write the equilibrium constant expression for the following reaction ?
2NO2 N2 O4 - xvii) Write the equilibrium constant expression for the following reaction ?
PCl3 + Cl2 PCl5 - xviii) Write equilibrium constant expression for following reaction ?
CO(g) + 3H2(g) + H2O(g) - xix) Write the equilibrium constant expression for the following reaction ?
|N2 +O2 2NO| - xx) Write Kcexpression for given equation .
|N2+O2 2NO| - xxi) What are numerator and denominator ?
- xxii) Define carbohydrates How do plants produce carbohydrate rates?
- xxiii) Write the characteristics of Oligosaccharides?
- xxiv) What is biochemistry? Explain its importance ?
- xxv) What is amino acid ? Write its structural formula ?
- xxvi) Which elements are found in protein?
- xxvii) Explain the difference between protein and amino acids?
- xxviii) What is the reason of rancidity in butter ?
- xxix) How vegetable oil converted in vegetable ghee?
- xxx) Name the process use for extraction of metal from the concentrated ore ?
- xxxi) What is meant by Bessemerization ?
- xxxii) Why small amount of coke is required in smelting process ?
- xxxiii) How are slag and metta removed from the blast furnace ?
- xxxiv) Draw flow sheet diagram for extraction of copper ?
- xxxv) Why is lime added in smelting process ?
- xxxvi) Name the Raw material used in solvay’s process ?
- xxxvii) What is the role of technology in the production of common chemicals ?
- xxxviii) How ammonia recovered in Ammonia recovery tower ?
- xxxix) Write the chemical reaction that occur in ammonia recovery tower ?
- xl) Solvay’s process consists of how many reaction ?
- xli) Write down the benefits of solvay’s process ?
- xlii) Draw Flow sheet Diagram of the Solvay’s Process for the manufacturing of sodium carbonate ?
- xliii) What is meant by ammonia liquor ?
- xliv) What is the main function of fertilizers ?
- xlv) Write any four uses of urea ?
- xlvi) Name the four urea manufacturing units in Pakistan ?
- xlvii) What happens when ammonium carbamate heated with steam ?
- xlviii) What are natural fertilizers ? Give examples ?
- xlix) Describe the three properties of urea ?
- l) How ammonium carbonate formed ?
- li) Where Nitric acid and Acetic acid are used ?
- lii) What is stomach acidity?
- liii) Write the following Conjugate acids?
1)OH–
2) HCO3-1
3) HPO4-2
4) CH3COOH - liv) Write the names of two natural acids and their sources ?
- lv) Which acid is present in ant sting , vinegar , sour milk and citrus fruits ?
- lvi) Write two physical properties of Acid ?
- lvii) Write use of Sodium Sulphate and Sodium Silicate ?
- lviii) Write the use of Sodium tetraborate ?
- lix) Describe two important characteristics of salts ?
- lx) Write the names of two methods of preparing Salts ?
- lxi) What is the chemical formula of Zinc Sulphate and Potassium nitrate ?
- lxii) Write uses of following ? 1 Calcium Sulphate 2) Pottasium Sulphate
- lxiii) How salts is prepared by the reaction of an acid and metallic oxide ?
- lxiv) Why pure water is not strong electrolyte ?
- lxv) Solution of Hydrochloric acid is 0.01M. What is its pH ?
- lxvi) What is the results of pH ?
- lxvii) Write the uses of pH ?
- lxviii) What are Organic Compounds ?
- lxix) What is the Wohler in Organic chemistry?
- lxx) Describe any two comparative characteristics of organic compounds and inorganic compounds?
- lxxi) Which are most important solvents which are used to dissolve organic compounds?
- lxxii) What is the modern definition of organic? Chemistry and which of the elements other than carbon and hydrogen may be present in organic compounds?
- lxxiii) Which organic compound was first of all prepared in the laboratory?
- lxxiv) Write down the dot and cross formula of propane and normal butane?
- lxxv) Define isomers of butane ?
- lxxvi) Write the structural formula of propane and hexane?
- lxxvii) Write down the general formula of Alkanes ,Alkynes and Alkyl redical ?
- lxxviii) What are ketons? Give examples?
- lxxix) What is Bromine Water Test?
- lxxx) What is meant by carboxyl function group? Explain with an example?
- lxxxi) Write formula of formic acid and acetic acid?
- lxxxii) Describe test for ketonic group?
- lxxxiii) Which functional groups are present in alkanes and alkaines?
- lxxxiv) What is an ether linkage? Give examples?
- lxxxv) What are amines? Write two examples?
- lxxxvi) Write test for alcoholic group ?
- lxxxvii) Write the general formula for saturated and unsaturated hydrocarbons?
- lxxxviii) Why are hydrocarbons soluble in organic solvents?
- lxxxix) How hydrogenation of alkene take place ?
- xc) How are hydrocarbons used as fuel?
- xci) Define aliphatic hydrocarbons and give two examples ?
- xcii) How reduction of alkyl halidis take place?
- xciii) Name the methods for perpration of alkanes ?
- xciv) How are alkyl halidis reduced ?
- xcv) What is substituation reaction?
- xcvi) Why alkenes are called olefins ?
- xcvii) Give a test used to identify unsaturation of an organic compound ?
- xcviii) Name the method use for the prepration of alkenes ?
- xcix) How alkenes are synthesize from alkyl halides ?
- c) Why alkenes are reactive ?
- ci) How dichloromethene forms from methene ?
- cii) What is meant by hydrogenation of vegetable oil?
- ciii) What is meant by hydrogenation?
- civ) Write the molecular and structural formula of propane and ethane?
- cv) What type of products obtained by dehydrohalogenation of vicinal dihalides ?
- cvi) How alkynes react with halogen?
- cvii) What is the molecular and condensed formula of propane and butane?
- cviii) What are petrochemicals? Give examples?
- cix) Write formulas for oxalic acid and glycerol?
- cx) How hydrocarbons are used as synthetic detergents?
- cxi) How can you make acetylene from tetrachloroethane?
- cxii) Write an method of prepration of alkyne ?
- cxiii) What is the height and range of temperature of the stratosphere?
- cxiv) How temperature of atmosphere is maintained?
- cxv) What is atmosphere ? Write names of its different layers?
- cxvi) What is ozone? And where is it exists ?
- cxvii) Define pollutant and give example ?
- cxviii) Why the flood risks are increasing?
- cxix) What is meant by global warming?
- cxx) How excess of CO2 in environment cause pollution?
- cxxi) How use can reduce air pollution generated by automobiles ?
- cxxii) Define acid rain and how is it produced ?
- cxxiii) Define Pollution?
- cxxiv) What is the role of government in controlling pollution?
- cxxv) Define incrimination ?
- cxxvi) Why is ozone depleting in the atmosphere?
- cxxvii) Write the names of the two main gases in atmosphere?
- cxxviii) Write two causes of ozone depletion?
- cxxix) Explain the main cause of ozone depletion is chlorofluorocarbons?
- cxxx) What is ozone? Where and how is it formed?
- cxxxi) Why nonpolar compounds are not soluble in water ?
- cxxxii) What is chemical composition of water ?
- cxxxiii) Describe composition of water molecule ?
- cxxxiv) What are the forces causes of dissolving of polar things in water ?
- cxxxv) Describe hydrogen bonding in water ?
- cxxxvi) How addition of Na2CO3 removes permanent hardness of water ?
- cxxxvii) Give causes of temporary hardness in water ?
- cxxxviii) What is the difference between soft and hard water ?
- cxxxix) Which salts cause water hardness?
- cxl) How temporary hardness of water is removed by Clark’s method ?
- cxli) How slaked lime remove temporary hardness of water ?
- cxlii) What is scum ?
- cxliii) Write down the reasons of permanent hardness?
- cxliv) Write down a few disadvantages of hard water ?
- cxlv) What are industrial effluents ? Give example ?
- cxlvi) How water used as cleaning agent in industries causes pollution ?
- cxlvii) How decaying plants consume oxygen ?
- cxlviii) Write the effects of cadmium and mercury poisoning ?
- cxlix) Write the effects of detergents on aquatic life ?
- cl) What is role of industries in our life ?
- cli) What are domestic effluents ?
- clii) What is Hookworm? Where attack in human body ?
- cliii) What do you know about jaundice and typhoid ?
- cliv) Write notes on Hookworm and typhoid ?
- clv) Write reason of water born diseases ?
- clvi) What is the reason of jaundice and typoid ?
- clvii) What is meant by chlorination ?
- clviii) What is diarrhea and dysentery ?
- clix) What is meant by fluorosis ?
- clx) Write procedure of swimming pool cleanliness ?
- clxi) Derive equilibrium constant expression for the synthesis of ammonia from nitrogen and hydrogen.
- clxii) What are the characteristics of a reaction that establishes equilibrium state at once?
- clxiii) An industry was established based upon a reversible reaction. It failed to achieve products on commercial level. Can you point out the basic reason of its failure being a chemist?
- clxiv) What is difference between glucose and fructose?
- clxv) Where the proteins are found?
- clxvi) Which ten amino acids are essential for us?
- clxvii) How proteins are formed?
- clxviii) Give the general formula of lipids?
- clxix) Describe the sources and uses of vitamin A.
- clxx) Lactose is disaccharide; which monosaccharides are present in it?
- clxxi) A compound consisting of four carbon atom has a triple bond in it. How many hydrogen atoms are present in it?
- clxxii) Justify that alkanes give substitution reactions?
- clxxiii) Why colour of bromine water discharges on addition of ethene in it?
- clxxiv) Explain different radicals of butane.
- clxxv) How is coal formed?
- clxxvi) What is the importance of natural gas?
- clxxvii) Define structural formula. Draw the structural formulae of n-butane and isobutane.
- clxxviii) Write classification of coal.
- clxxix) What are heterocyclic compounds? Give two examples.
- clxxx) Why H+ ion acts as a Lewis acid?
- clxxxi) Name two acids used in the manufacture of fertilizers.
- clxxxii) Na2So4 is a neutral salt while NaHSO4 is an acid salt. Justify.
- clxxxiii) How the soluble salts are recovered from water?
- clxxxiv) Name the acids present in:
(i)vinegar (ii) ant sting, (iii) Citrus fruit, (iv) sour milk - clxxxv) Name the various metallurgical operations.
- clxxxvi) Explain process of electro-refining.
- clxxxvii) How ammonia is recovered in the Solvay’s process?
- clxxxviii) Describe the formation of petroleum.
- clxxxix) Which petroleum fraction is used in dry cleaning?
- cxc) How is roasting carried out?
- cxci) What are the advantages of Solvay’s process?
- cxcii) Which forces are responsible for dissolving polar substances in water?
- cxciii) Mention the disadvantages of detergents.
- cxciv) How detergents make the water unfit for aquatic life?
- cxcv) Why pesticides are used?
- cxcvi) How does water dissolve sugar and alcohol?
- cxcvii) What is the difference between biodegradable and non-biodegradable substances?
- cxcviii) How is ozone layer formed in stratosphere?
- cxcix) How does acid rain increase the acidity of soil?
- cc) How ozone layer is being depleted by chlorofluorocarbons?