MCQ Questions for Class 11 Physics Chapter 12 Thermodynamics with Answers

Leave a Comment / By / January 25, 2022

Here you will find NCERT MCQ Questions for Class 11 Physics with Answers PDF Free Download based on the important concepts and topics given in the textbook as per CBSE new exam pattern. 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 Class 11 Physics. 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. Which of the following parameters dose not characterize the thermodynamic state of matter?

(a) work
(b) volume
(c) pressure
(d) Temperature

(a) work

Q2. Directions: The following question has four choices out of which ONLY ONE is correct.
A Carnots engine works as a refrigerator between 250 K and 300 K. If it receives 750 calories of heat from the reservoir at the lower temperature, the amount of heat rejected at the higher temperature is __.

(a) 900 cal
(b) 625 cal
(c) 750 cal
(d) 1000 cal

(a) 900 cal

Q3. 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:

(a) 10 J
(b) 20 J
(c) 30 J
(d) 50 J

(c) 30 J

Q4. Directions: The following question has four choices out of which ONLY ONE is correct.
In a thermodynamic process, pressure of a fixed mass of the gas is changed in such a manner that the gas molecules give out 30 J of heat. Also, 10 J of work is done on the gas. If the internal energy of the gas was 40 J, what will be the final internal energy?

(a) 20 J
(b) −20 J
(c) 80 J
(d) zero

(a) 20 J

Q5. 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?

(a) 275 K
(b) 325 K
(c) 250 K
(d) 380 K

(c) 250 K

Q6. For a diatomic gas change in internal energy for a unit change in temperature for constant pressure and constant volume is U1 and U2 respectively. What is the ratio of U1 and U2?

(a) 5 : 3
(b) 3 : 5
(c) 1 : 1
(d) 5 : 7

(c) 1 : 1

Q7. Calculate the heat required to make 6.4 Kg CaC2 from CaO(s) and C(s) from the reaction: CaO(s) + 3 C(s) ? CaC2(s) + CO (g) given that ?f Ho (CaC2) = -14.2 kcal. ?f H° (CO) = -26.4 kcal.

(a) 5624 kca
(b) 1.11 × 104 kcal
(c) 86.24 × 10³
(d) 1100 kcal

(b) 1.11 × 104 kcal

Q8. In a system where ?E = -51.0 kJ, a piston expanded against a pext of 1.2 atm giving a change in volume of 32.0 L. What was the change in heat of this system?

(a) -36 kJ
(b) -13 kJ
(c) -47 kJ
(d) 24 kJ

(c) -47 kJ

Q9. A system absorb 10 kJ of heat at constant volume and its temperature rises from 270 C to 370 C. The value of ? U is

(a) 100 kJ
(b) 10 kJ
(c) 0 kJ
(d) 1 kJ

(b) 10 kJ

Q10. In which of the following process, a maximum increase in entropy is observed?

(a) Dissolution of Salt in Water
(b) Condensation of Water
(c) Sublimation of Naphthalene
(d) Melting of Ice

(c) Sublimation of Naphthalene

Q11. The bond energy (in kcal mol-1) of a C-C single bond is approximately

(a) 1
(b) 10
(c) 83-85
(d) 1000

(c) 83-85

Q12. The first operation involved in a Carnot cycle is

a) isothermal expansion
b) adiabatic expansion
c) isothermal compression
d) adiabatic compression

a) isothermal expansion

Q13. “Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of

a) second law of thermodynamics
b) conservation of momentum
c) conservation of mass
d) first law of thermodynamics

a) second law of thermodynamics

Q14. Air conditioner is based on the principle of

a) refrigerator
b) first law of thermodynamics
c) None of these
d) Carnot cycle

a) refrigerator

Q15. Which of the following processes is reversible?

a) Isothermal compression
b) Electrical heating of a nichrome wire
c) Transfer of heat by radiation
d) Transfer of heat by conduction

a) Isothermal compression

Q16. Which of the following processes is irreversible?

a) Transfer of heat by radiation
b) Adiabatic changes performed slowly
c) Extremely slow extension of a spring
d) Isothermal changes performed slowly

a) Transfer of heat by radiation

Q17. Heat engine is a device by which a system is made to undergo a …X… process that result in conversion of …Y… into work. Here, X and Y refer to

a) cyclic and heat
b) None of these
c) isothermal and heat
d) cyclic and work

a) cyclic and heat

Q18. Which of the following statements is incorrect?

a) All reversible cycles have same efficiency
b) Reversible cycle has more efficiency than an irreversible one
c) Carnot cycle is a reversible one
d) Carnot cycle has the maximum efficiency in all cycles

a) All reversible cycles have same efficiency

Q19. 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

(a) 2
(b) 3/2
(c) 4/3
(d) 5/3

(b) 3/2

Q20. Directions: The following question has four choices out of which ONLY ONE is correct.
A thermodynamical system is changed from state (P1, V1) to (P², V²) by two different processes, the quantity which will remain same is:

(a) ΔQ
(b) ΔW
(c) ΔQ + ΔW
(d) ΔQ – ΔW

(d) ΔQ – ΔW

Q21. If the co-efficient of performance of a refrigerator is 5 and operates at the room temperature 27°C, the temperature inside the refrigerator is

a) 250 K
b) 230 K
c) 260 K
d) 240 K

a) 250 K

Class 11 Physics MCQs Questions with Answers Chapter Wise

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