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.

MCQ Class 11 Physics Chapter 12 With Answers

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

Q3. During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio Cp/Cv for the gas is

(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.

Q6. The temperature of reservoir of Carnots engine operating with an efficiency of 70% is 1000 kelvin. The temperature of its sink is

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 In a heat reservoir, when a certain amount of heat is withdrawn from it, its temperature :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

Q11. The translational kinetic energy of gas molecules at temperature T for one mole of a gas is

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

(i) (3/2) RT

Q12. Energy transfer brought about by moving the piston of a cylinder containing the gas is known as

(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.

Q14. An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C, its efficiency is doubled. Temperature of the source is:

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

(iv) 99°C

Q15. A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase its efficiency by 50% of original efficiency?

(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.

Q19. The temperatures of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming, that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be nearly:

(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

Q22. Which of the following parameters dose not characterize the thermodynamic state of matter?

(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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Class 11 Physics MCQ Questions Chapter wise with Answers

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