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

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 D of Solved CBSE Sample Paper for Class 11 Physics is given below with link to download its solutions.

## Sample Question Paper

1. Moon travellers tie heavy weight at their back before landing on the moon. Why ? (HOTS)

2. A wooden block is on the bottom of a tank when water is poured in the contact between the block and the tank is so good that no water gets between them. Is there a buoyant force on the block ? (HOTS)

3. Why the boiling point of a liquid varies with pressure ?

4. When a body of mass 2-0 kg is suspended by a spring, the spring is stretched if the body is pulled down slightly and released, it oscillates up and down. What force is passes through the mean position ? (g = 9-8 N kg^{-1})

5. Is superposition principle applicable to electromagnetic waves ?

6. Whether equation

F.S. = 1/2mv^{2} – 1/2mu^{2}

is dimensionally correct, where m is mass of the body, v is its final velocity, u is initial velocity, F

is applied force and S is distance covered.

7. Give relation between dyne and newton.

**Or**

Is greater than or less than ? (HOTS)

8. What is instantaneous power :

9. Figure shows the strain-stress curve for a given material. What are (a) Young’s modulus, and (b) approximate yield strength for this material ?

10. What displacement,(i) the P.E. of a simple harmonic oscillator is maximum, (ii) the K.E. is maximum?

11.Give a method of determine the angular size of a planet.

12. The velocity-time graph of an object moving along a straight line is as shown :

Calculate distance covered by object between :

(i) t = 0 to t = 5 sec.

t = 0 to t = 10 sec.

13. Does the nature of a vector change when it is multiplied by a scalar ?

14. Three blocks are connected as shown below and are on a horizontal frictionless table. They are pulled to right with a force F = 50 N. If m_{1} = 5 kg, m_{2} = 10 kg and m_{3} = 15 kg. calculate tensions T_{1} and T_{2}.

15. What are the important points about the uniform motion ?

16. A truck and a car moving with the same K.E. on a straight road. Their engines are simultaneously switched off. Which one will stop at a lesser distance ?

17. Calculate the moment of inertia about the diameter if that of an axis perpendicular to the plane of a disc and passing through its centre is given by 1/2 MR_{2} .

Or

Derive the expression for momentum conversation.

18. What is binding energy of a satellite ?

19. The amplitude of a simple harmonic oscillator is doubled. How does this effect : (i) the maximum velocity, (ii) the total energy, and (iii) the period of oscillator ?

20. For the travelling harmonic wave

y (x, t) = 2.0 cos 2π [10t — 0.0080x + 0.351

where x andy are in cm and tin s. Calculate the phase difference between oscillatory motion of two points separated by a distance of (a) 4 cm, (b) 0-5 m, (c)λ/2, (d) 3λ/4.

21. (a) The blood pressure in human is greater at the feet than at the brain. Why ?

(b) Atmospheric pressure at a height of about 6 km decreases to nearly half its value at the sea level, though the ‘height’ of the atmosphere is more than 100 km. Why ?

(c) Hydrostatic pressure is a scalar quantity even though pressure is force finited by area, and force is a vector. Why ?

22. Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evaaeated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following :

(a) What is the final pressure of the gas in A and B?

(b) What is change in the internal energy of the gas ?

(c) What is the change in the temperature of the gas ?

(d) Do the intermediate state of the system (before sitting to the final equilibrium state) lie on its P — V— T surface ?

23. Radha found the wheel getting detached from her uncle’s car. She took it to workshop and got it repaired. She informed her uncle, who is a mechanical engineer, about this matter.

(a) What according to you the values displayed by Radha ?

(b) A thin wheel can stay up-right on its rim for a considerable length of time when rolled with a considerable velocity, while it falls from its upright position at the slightest disturbance, when stationary. Explain. (V.B.Q.)

24. (a) Prove work energy theorem for a variable force.

(b) Two protons are brought towards each other. Will the potential energy of the system decrease or increase ? If a proton and an electron be brought nearer, then ? **OR**

A block initially at rest breaks into two parts of masses in the ratio 2 : 3. The velocity of smaller part is (81 + 6:1) m/s. Find the velocity of bigger part.

In a nerve impulse, about a 10 neutrons are fired. If energy associated with d is charge of a single neutron is 10^{-10} J. Estimate the energy used.

25. Explain why :

(a) To keep a piece of paper horizontal, you should blow over, not under it.

(b) When we try to close a water tap with our fingers, fast jets of water gush through the openings between our fingers.

(c) The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection.

(d) A fluid flowing out of a small hole in a vessel results in a backward thrust on the vessel.

(e) A spining cricket ball in air does not follow a parabolic trajectory.

**Or**

A nanometer reads the pressure of gas in an enclosure as shown in figure (a). When a pump removes some of the gas, the manometer reads as in figure (b). The liquid used in the manometers is mercury and the atmospheric pressure is 76 cm of mercury.

(a) Give the absolute and gauge pressure of the gas in the enclosure for cases (a) and (b) in units of cm of mercury.

(b) How would the levels change in case (b) if 13.6 cm of water (immiscible with mercury) are poured into the right limb of the manometer ? (Ignore the small change in volume of the gas). (HOTS)

26. (a) State and explain Charle’s law.

(b) State and derive the ideal gas equation.

**Or**

(a) Determine the mumerical value of R and K_{B}.

(b) Obtain the relation between degrees of freedom of a gas and ratio of two principal specific heat of the gas.

## Sample Question Paper Solutions

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