## CBSE Sample Paper for Class 11 Physics (Solved) – Set C

There is no overall choice in the paper. However, there is n internal choice in one question of 2 marks weight-age, one question of 3 marks weight-age and all t three questions of 5 marks weight age. Please note that the paper given here is only a sample. You can use log table if necessary. Use of calculator is not permitted. Set C of Solved CBSE Sample Paper for Class 11 Physics is given below with link to download its solutions.

## Sample Question Paper

1. Convert 1 kWh in joule. (HOTS)

2. Define thrust ?

3. What is the equation and work done in an adiabatic process ?

4. What is odour ?

5. Which of the following conditions is not sufficient for S.H.M. and why ?

(i) acceleration ∝ displacement.

(ii) restoring force displacement. (HOTS)

6. “A more precise measurement has to be more accurate.” Comment.

7. What can be represented by the graph given below, where h is height and v is velocity ?

8. The sum and difference of two vectors are perpendicular to each other. Prove that the vectors are equal in magnitude.

Or

Why a horse has to apply more force to start a cart than to keep it moving ? Explain.

9. (a) What is the physical significance of M.I. ?

(b) Define M.I. of a body rotating about an axis.

10. Define undamped and damped oscillations.

11. In an experiment, on determining the density of a rectangular block, the dimensions of the block are measured with a vernier caliper (with a least count of 0.01 cm) and its mass is measured with a beam balance of least count 01 g. How do we report our result for the density of the block ? (HOTS)

12. A player throws a ball upwards with an initial speed of 291 ms^{-1}.

(a) What is the direction of acceleration during the upward motion of the ball ?

(b) What is the velocity and acceleration of the ball at the highest point of its motion ?

(c) Choose the x = 0 m and t = 0 s to be the location and time of the ball at its highest point, vertically downward direction to the positive direction of x-axis and give the signs of position, velocity and acceleration of the ball during its upward and downward motion.

(d) To what height does the ball rise and after how long does the ball return to the player’s hand? (Take g = 9.8 ms^{-2} and neglect air resistance)

13. The celling of a long hall is 25 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 ms^{-1} can go without hitting the celling of the hall ?

14. Two bodies A and B of masses 10 kg and 20 kg respectively kept on a smooth horizontal surface are tied to the ends of a light string. A horizontal force F = 600 N is applied to (a) A, (b) B along the direction of string. What is the tension in the string in each case ?

15. A molecule in a gas container hits a horizontal wall with speed 200 ms^{-1} and angle 30° with the normal and rebounds with the same speed. Is momentum conserved in the collision ? Is the collision elastic or inelastic ?

16. Show that centre of mass of a system of two particles lies on the straight line joining them.

17. Suppose there existed a planet that went around the sun twice as fast as the earth. What would be its orbital size as compared to that of earth.

18. Figure (a) shows a spring of force constant K clamped rigidly at one end and a mass m attached to its free end. A force applied at the free end stretches the spring.

Figure (b) shows the same spring with both ends free and attached to a mass m at either end. Each end of the spring in figure (b) is stretched by the same force F.

(i) What is the maximum extension of the spring in the two cases ?

(ii) If the mass in figure (a) and the two masses in fig. (b) are released free. What is the period of oscillations in each case ?

**Or**

What are nodes and antinodes ? Do they coincide with pressure nodes and antinodes ? In terms of X, what is the separation of a node from the nearest antinode ? What is the phase difference between points separated by X/10 in stationary waves ?

19. Define Pascal law and give its particle applications.

20. (a) Define stream line.

(b) Write any two properties of streamlines. (KVS 2008)

21. Give a brief account of Joule’s experimant ?

22. (a) State second law of thermodynamics.

(b) What is coefficient of performance of a refrigerator ?

23. The Physics Teacher of class XI has assigned the work of finding the resultant spring constant when two springs of spring constants k_{1}, k_{2} are joined in series. Two students Sabita and Shirin. Sabita made a theoretical study as well as verified experimentally. Whereas Shirin could not complete the work. When the teacher enquired the next day Sabita could give the answer. Whereas Shirin could not :

(a) comment upon the qualities of Sabita.

(b) Two springs are joined in series and connected to a mass m as shown in fig. If spring constants are k_{1} and k_{2}, calculate the period of oscillation of mass m. (V.B.Q.)

24. State and prove parallelogram law of vector addition. Discuss some special cases.

**Or**

(a) Discuss the problem of a swimmer, who want to cross the river in the shortest time.

(b) Define null vector. What are its properties and physical significance.

25. Prove the relation between torque and momentum of inertia. (HOTS)

**Or**

Derive an expression for K.E. of rotation.

26. By using Stoke’s law derive an expression of terminal velocity. On what factors it depends ?

**Or**

Explain surface energy. Establish its relation with surface tension.

## Sample Question Paper Solutions

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