# Thermodynamics MCQ Questions for Class 11 Physics Chapter 12 with Answers

NCERTCOURSE.COM given here the NCERT chapter-wise Multiple Choice Questions from Class 11 Physics book Chapter 12 Thermodynamics with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Thermodynamics. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. The process forbidden by the first law of thermodynamics is

(i) conversion of w ork into heat.
(ii) conversion of heat into work.
(iii) change in internal energy.
(iv) none of the above.

(iv) none of the above.

## Q2. At a given volume and temperature, the pressure of a gas

(i) varies inversely as its mass
(ii) varies inversely as the square of its mass
(iii) varies linearly as its mass
(iv) is independent of its mass

(iii) varies linearly as its mass

(i) 2
(ii) 3/2
(iii) 4/3
(iv) 5/3

(ii) 3/2

## Q4. First law of thermodynamics states that

(i) heat is a form of energy
(ii) system has pressure
(iii) system has temperature
(iv) system can do work

(i) heat is a form of energy

## Q5. The temperature of a gas is due to the

(i) K.E. of the gas molecules.
(ii) repulsive force between the molecules.
(iii) attractive force between the molecules.
(iv) P.E. of the gas molecules.

(i) K.E. of the gas molecules.

(i) 300 K
(ii) 400 K
(iii) 500 K
(iv) 700 K

(i) 300 K

## Q7. Heat cannot by itself flow from a body at lower temperature to a body at higher temperature is a statement as a conseqence of

(i) conservation of mass
(ii) conservation of momentum
(iii) first law of thermodynamics
(iv) second law of thermodynamics

(iv) second law of thermodynamics

## Q8. Which of the following is a state variable ?

(i) Internal energy
(ii) Heat
(iii) Work
(iv) All of these

(i) Internal energy

## Q9. In a heat reservoir, when a certain amount of heat is withdrawn from it, its temperature :

(i) increases
(ii) decreases
(iii) remains constant
(iv) becomes zero

(iii) remains constant

Q10. A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300 K. The ratio of the average rotational kinetic energy per O² to per N² molecule is

(i) 1 : 1
(ii) 1 : 2
(iii) 2 : 1
(iv) 2 : 3

(i) 1 : 1

(i) (3/2) RT
(ii) (9/2) RT
(iii) (1/3) RT
(iv) (5/2) RT

(i) (3/2) RT

(i) work
(ii) heat
(iii) pressure
(iv) temperature

(i) work

## Q13. The efficiency of a practical engine is

(i) more than the efficiency of Carnot’s engine.
(ii) less than the efficiency of Carnot’s engine.
(iii) equal to the efficiency of the Carnot’s engine.
(iv) none of the above.

(ii) less than the efficiency of Carnot’s engine.

(i) 124°C
(ii) 37°C
(iii) 62°C
(iv) 99°C

(iv) 99°C

(i) 275 K
(ii) 325 K
(iii) 250 K
(iv) 380 K

(iii) 250 K

## Q16. At a given temperature the internal energy of a substance

(i) in liquid state is less than that in gaseous state.
(ii) in liquid state is more than that in gaseous state
(iii) is equal for the three states of matter.
(iv) in liquid state is equal to that in gaseous state

(i) in liquid state is less than that in gaseous state.

## Q17. Tell which of the following phenomenon are reversible?

(i) Water fall.
(ii) Charging of a battery.
(iii) Rusting of iron by chemical change.
(iv) Production of heat by rubbing of hands.

(ii) Charging of a battery.

## Q18. A gas is taken through a number of thermodynamic states. What happens to its specific heat?

(i) It is always constant.
(ii) It increases.
(iii) It decreases.
(iv) It can have any value depending upon the process of heat absorbed or evolved.

(iv) It can have any value depending upon the process of heat absorbed or evolved.

(i) 10 J
(ii) 20 J
(iii) 30 J
(iv) 50 J

(iii) 30 J

## Q20. The variable defined by Zeroth law of thermodynamics is

(i) temperature
(ii) internal energy
(iii) work
(iv) All of these

(i) temperature

## Q21. The first law of thermodynamics is represented as

(i) dQ = dU + dW
(ii) dQ = 2dU + dW
(iii) dQ = dU – dW
(iv) dQ = dU + 2dW

(i) dQ = dU + dW

(i) work
(ii) volume
(iii) pressure
(iv) temperature

(i) work

## Q23. At a given volume and temperature, the pressure of a gas

(i) varies inversely as its mass
(ii) varies inversely as the square of its mass
(iii) varies linearly as its mass
(iv) is independent of its mass

(iii) varies linearly as its mass

## Q24. Air conditioner is based on the principle of

(i) refrigerator
(ii) first law of thermodynamics
(iii) None of these
(iv) Carnot cycle

(i) refrigerator

## Q25. For an isothermal expansion

(i) process should be performed in very small steps.
(ii) perfect conducting communication with the surroudings is required.
(iii) process should be slow.
(iv) all of the above are correct.

(iv) all of the above are correct.

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