1st Year Guess Paper – Physics for Class 11 – NOTESPK Guess Papers.

**CHAPTER# 01: MEASUREMENTS (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- Frontiers of fundamental science.
- Define radian and steradian.
- What are the three steps to finding uncertainty in the average value of many measurements?
- Does a dimensional analysis give any information on the constant of proportionality?
- Write down the two uses of dimension analysis.
- Principle of homogeneity
- Write the dimension of pressure and density.
- . What are the dimensions and units of gravitational constant G in the formula?
- What are the dimensions and SI units of the coefficient of viscosity in the relation?
- Show that the expression is dimensionally correct.
- Show that the famous Einstein equation is dimensionally consistent.
- . Check the correctness of the relation, where v is the speed of a transverse wave on a stretched string of tension F, length, and mass m.
- Write the dimensions of work and torque.
- Check the correctness of the relation.
- Difference between precision and accuracy
- Difference between random and systematic error
- How can you find uncertainty in a timing experiment?
- What is the difference between absolute uncertainty and percentage uncertainty?

__Important Long Answer Questions__

- Write in detail about errors and their types. And how errors are removed or minimized? 2. Describe the significant figures and degree of accuracy. Also, give examples. 3. Write a note on the SI system of units.

**CHAPTER# 02: VECTORS AND EQUILIBRIUM (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

1. What do you know about Right Hand Rule? Also, state it. 2. Show the sum and difference of two perpendicular vectors of equal lengths that are also perpendicular and of the same length. 3. The vector sum of three vectors gives a zero resultant. What can be the orientation of the vectors? 4. Why a null vector cannot be added to zero? Explain. 5. Define null vectors and equal vectors. 6. What is the unit vector in the direction of the vector? 7. Define the terms unit vector and position vector. 8. Is it possible to add a vector quantity to a scalar quantity? Explain. 9. Explain the rectangular coordinate system. 10. What do you understand by positive and negative torques?

11. Define torque. Write its units and dimensions. 12. What is the difference between moment arm and moment of force? 13. Suppose the sides of a polygon represent a vector arranged head to tail. What is the sum of these vectors? 14. Explain how a vector can be subtracted from other vectors? 15. Define the resultant vector and component of a vector. 16. Difference between translational and rotational equilibrium.. 17. Difference between static and dynamic equilibrium. ? Explain. 18. If a vector lies in xy-plane. Is it possible, one of its rectangular components is zero? Explain. 19. Show that: .20. Conditions of equilibrium.

__Important Long Answer Questions__

1. Derive expressions for the magnitude and direction of the resultant of two vectors using their rectangular components. 2. What is torque? Calculate torque due to force acting on a rigid body. 3. Define cross-product. Write down its characteristics. 4. Define and explain the scalar product of two vectors. Give two examples.

**CHAPTER# 03: MOTION AND FORCE (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- Define impulse. Show how is it related to linear momentum. 2. Does a moving object have an impulse? 3. State the law of conservation of momentum and write down its mathematical form. 4. Explain the difference between elastic and inelastic collisions. Also, give an example. 5. When a rocket re-enters the atmosphere, its nose becomes very hot, why? 6. Explain what is meant by projectile motion? Give an example. 7. At what point or points in the path does a projectile have its minimum speed and its maximum speed? 8. Define the range and time of flight of a projectile. 9. Show that range of the projectile is maximum when the projectile is thrown at an angle of horizontal. 10. What is a ballistic missile and ballistic trajectory? 11. A man wishes to take a long jump. At what angle he should jump? Explain. 12. The horizontal range of the projectile is four times its maximum height. What is the angle of projection? 13. Difference between uniform and variable velocities 14. Define uniform acceleration, 15. Draw velocity time graphs 16. Difference between positive and negative acceleration.

__Important Long Answer Questions__

1. A proton moving with speed passes through a thick sheet of paper and emerges with a speed of. Assuming uniform deceleration, find retardation and the time taken to pass through the paper. 2. A body places a firecracker of negligible mass in an empty can of 40 g mass. He plugs the end with a wooden block of mass 200 g. After igniting the firecracker, he throws the can straight up. It explodes at the top of its path. If the block shoots out with a speed of, how fast will be the can going? 3. A truck weighing 2500 kg and moving with a velocity of collides with a stationary car weighing 1000 kg. The truck and the car move together after the impact. Calculate their common velocity.

4. Two blocks of masses 2.0 kg and 0.50 kg are attached at the two ends of a compressed spring. The elastic potential energy stored in the spring is 10 J. Find the velocities of the blocks if the spring delivers its energy to the blocks when released. 5. A football is thrown upward with an angle of with respect to the horizontal. To throw a 40 m pass what must be the initial speed of the ball? 6. Find the angle of projection of a projectile for which its maximum height and horizontal range are equal. 7. Prove that for angles of projection, which exceed or fall short of by equal amounts, the ranges are equal.

1st Year Guess Paper – Physics for Class 11 – NOTESPK

**CHAPTER# 04: WORK AND ENERGY (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- An object has one joule of potential energy. What does it mean? Explain. 2. Calculate the work done in kilojoules in lifting a mass of 10 kg through a vertical height of 10 m. 3. In which case is more work done? When a 50 kg bag of books is lifted through 50 cm or when a 50 kg crate is pushed through 2 m across the floor with a force of 50 N? 4. Under what conditions work done will be positive and negative? 5. Define the term power and its SI units.

6. Prove that: . 7. Define kilowatt hour. Show that: . 8. Define work energy principle. Also write down its equations. 9. What is escape velocity of an object? Write its mathematical expression. 10. A girl drops a cup from a certain height, which breaks into pieces. What energy changes are involved? 11. When a rocket re-enters the atmosphere, its nose cone becomes very hot, where does this heat energy comes from? 12. Define Joule and Watt. 13. What is Salter Duck? 14. What is solar constant. 15. List of non-conventional energy sources.

__Important Long Answer Questions__

- Show that work done in the earth’s gravitational field is independent of the path followed. 2. What is absolute potential energy? Calculate the value of absolute potential energy in the gravitational field. 3. Explain the phenomenon ‘inter conversion’ of the kinetic and potential energy. 4. Write a note on escape velocity.

1st Year Guess Paper – Physics for Class 11 – NOTESPK

**CHAPTER# 05: CIRCULAR MOTION (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- State the direction of following vectors in simple situations angular momentum and angular velocity. 2. Define angular displacement and its SI units. 3. Define angular velocity and what is its SI unit? 4. Explain the difference between tangential velocity and the angular velocity? Write the formula relates them. 5. When mud flies off the tyre of a moving bicycle, in what direction does it fly? 6. Why does a diver change his body position before and after diving in the pool? 7. Prove that: . 8. Define centripetal force and write its formula. 9. Show that: . 10. What is meant by moment of inertia? Give its significance. 11. Show that the angular momentum .

12. How would you determine the direction of angular momentum? Give example. 13. What is meant by angular momentum? State law of conservation of angular momentum. 14. A disc and hoop start moving down from the top of an inclined plane at the same time. Which one will be moving faster on reaching the ground? 15. State the practical use of rotational K.E by flywheels. 16. Define and explain orbital velocity. 17. How many radians are there in 2 degree? 18. Convert two radians in degrees. 19. Prove that 1 radian. 20. What is the difference between inertia and moment of inertia?

__Important Long Answer Questions__

- What is the difference between real weight and apparent weight? Discuss different cases for apparent weight with respect to motion. 2. What is meant by centripetal force ad centripetal acceleration? Derive relations. 3. State and prove law of conservation of angular momentum. 4. Write a note on moment of inertia.5, Artificial gravity 6. Geostationary orbits.

1st Year Guess Paper – Physics for Class 11 – NOTESPK

**CHAPTER# 06: FLUID DYNAMICS (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- What do you understand by the term viscosity? Explain. 2. Explain the working of a carburetor of a motor car using Bernoulli’s principle. 3. Define terminal velocity. Write its formula. 4. Why fog droplets appear to be suspended in air? 5. Explain the difference between laminar flow and turbulent flow. 6. Define venture relation. 7. State Torricelli’s theorem and write its relation.

8. Two row boats moving parallel in the same direction are pulled towards each other. Explain. 9. Explain how the swing is produced in a fast moving cricket ball. 10. How an aeroplane is lifted upward? 11. Derive the relation between speed and pressure of the fluid. 12. What is Stoke’s law? Explain briefly. 13. Difference between systolic and diastolic blood pressure.

__Important Long Answer Questions__

- Water flows through a hose, whose internal diameter is 1 cm at a speed of. What should be the diameter of the nozzle if the water is to emerge at? 2. Water is flowing smoothly through a closed pipe system. At one point the speed of water is, while at another point 3.0 m higher, the speed is. If the pressure is 80 kPa at the lower point, what is the pressure at the upper point? 3. How large must a heating duct be if an air moving along it can replenish the air in a room of volume every 15 min? Assume the air’s density remains constant. 4. What gauge pressure is required in the city mains for a stream from a fire hose connected to the mains to reach a vertical height of 15.0 m?

1st Year Guess Paper – Physics for Class 11 – NOTESPK

**CHAPTER# 07: OSCILLATIONS (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- What is the total distance travelled by an object moving with SHM in a time equal to its period, if its amplitude is A? 2. What happens to the period of simple pendulum if its length is doubled? What happens if the suspended mass is doubled? 3. Does the acceleration of a simple harmonic oscillator remain constant during its motion? Is the acceleration ever zero? Explain briefly. 4. What is meant by phase angle and initial phase? 5. Calculate the length of a simple pendulum that completes one vibration in one second. 6. Differentiate between free and forced vibrations. 6. Write one advantage and one disadvantage of resonance. 7. Describe two common phenomena in which resonance plays an important role. 8. Discuss the heating of food in microwave oven by resonance. 9. What is driven harmonic oscillator? Give example. 10. Describe the role of resonance in tuning a radio set to hear desired station. 11. If a mass spring system is hung vertically and set into oscillations, why does the motion eventually stop? 12. The amplitude of simple pendulum should be small, why? Explain. 13. A spring of spring constant ‘k’ is cut into two equal lengths then what will be the spring constant for each part? Explain. 14. On what factors does the velocity of mass-spring system depend?

__Important Long Answer Questions__

- Discuss simple harmonic motion on the basis of uniform circular motion and derive expression for displacement and instantaneous velocity in terms of . 2. Explain the phenomenon of resonance. How would you demonstrate resonance? Give examples where resonance plays an important role. 3. What is simple pendulum? Show that its motion is SHM. Derive an expression for its time period. Also, find its frequency. 4. Prove that total energy is conserved in SHM.

1st Year Guess Paper – Physics for Class 11 – NOTESPK

**CHAPTER# 08: WAVES (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- Explain why sound travels faster in warm air than in cold air. 2. How temperature and density of the medium affect the speed of sound? 3. Why sound travels faster in hydrogen than in oxygen? 4. Why does sound travel faster in solids than in gases? 5. Write down the effects of variation of pressure and density on the speed of sound in a gas. 6. What is the effect of temperature on the speed of sound in gas? 7. What is the effect of density on the speed of sound? Explain briefly. 8. Is it possible for two identical waves traveling in the same direction along a string to give rise to a stationary wave? Explain briefly. 9. Explain beats with examples. 10. What are the factors on which the speed of sound in air depends? 11. How are beats useful in tuning a musical instrument? 12. What are stationary waves and how are they produced? 13. What is richer in harmonics? An open organ pipe or a closed organ pipe? 14. Describe the relation between pressure and density. 15. What is the difference between open and closed organ pipes? 16. Why did Newton fail to calculate the velocity of sound accurately? 17. What are the conditions for points which are in phase and out of phase? 18 Define Doppler’s shift and effect.

1st Year Guess Paper – Physics for Class 11 – NOTESPK

__Important Long Answer Questions__

- The frequency of the note emitted by a stretched string is 300 Hz. What will be the frequency of this note when: (a) the length of the wave is reduced by one-third without changing the tension (b) the tension is increased by one-third without changing the length of the wire. 2. An organ pipe has a length of 50 cm. Find the frequency of its fundamental note and the next harmonic when it is (a) open at both ends (b) closed at one end. 3. A church organ consists of pipes, each open at one end, of different lengths. The minimum length is 30 mm and the longest is 4 m. Calculate the frequency range of the fundamental notes.

1st Year Guess Paper – Physics for Class 11 – NOTESPK

**CHAPTER# 09: PHYSICAL OPTICS (1st Year Physics Guess / Important Questions)**

__Important Short Answer Questions__

- Define wavefront and a ray of light. 2. What is meant by wavefront? Give its types. 3. State Huygen’s principle. 4. Under what conditions do two or more sources of light behave as coherent sources? 5. Can visible light produce interference fringes? Explain. 6. How is the distance between interference fringes affected by the separation between the slits of Young’s experiment? Can fringes disappear? 7. Why central spot of Newton’s rings is dark? 8. Write down the selective absorption method to obtain plane-polarized light from ordinary light. 9. What are Newton’s rings? 10. How would you manage to get more orders of spectra using a diffraction grating? 11. Could you obtain Newton’s rings with transmitted light? If yes, would the pattern be different from that obtained with reflected light? 12. What is meant by the diffraction of light? 13. What is a diffraction grating and grating element? 14. Write two uses of X-ray diffraction by crystal. 15. What are optically active crystals? 16. How coherent light beams can be produced? Explain. 17, What is polarization?

1st Year Guess Paper – Physics for Class 11 – NOTESPK

__Important Long Answer Questions__

- Write the construction and working of Michelson’s interferometer. And how it is used to find unknown wavelengths? 2. Describe the diffraction of x-rays by crystals and obtain Bragg’s equation or law. 3. How Newton’s rings are formed? Explain. 4. Describe Young’s double slit experiment for the interference of light rays.

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1st Year Guess Paper – Physics for Class 11 – NOTESPK

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