# MCQ for Class 11 Physics Chapter 12 Thermodynamics with answer

MCQ for Class 11 Physics Chapter 12 : MCQs for Class 11 Physics Chapter 12 Thermodynamics with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

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MCQ for Class 11 Physics Chapter 12 : MCQs for Class 11 Physics Chapter 12 Thermodynamics with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

## MCQ for Class 11 Physics Chapter 12 Thermodynamics with answer

Q1. Third law of thermodynamics provides a method to evaluate which property?

(a) Absolute Energy
(b) Absolute Enthalpy
(c) Absolute Entropy
(d) Absolute Free Energy

(c) Absolute Entropy

Q2. One mole of which of the following has the highest entropy?

(a) Liquid Nitrogen
(b) Hydrogen Gas
(c) Mercury
(d) Diamond

(b) Hydrogen Gas

Q3. The enthalpy of vaporisation of a substance is 8400 J mol-1 and its boiling point is –173°C. The entropy change for vaporisation is :

(a) 84 J mol-1K-1
(b) 21 J mol-1K-1
(c) 49 J mol-1K-1
(d) 12 J mol-1K-1

(a) 84 J mol-1K-1

Q4. The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

(a) Br2(g)
(b) Cl2(g)
(c) H2O(g)
(d) CH4(g)

(b) Cl2(g)

Q5. In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?

(a) 850 kJ
(b) 600 kJ
(c) 350 kJ
(d) 250 kJ

(c) 350 kJ

Q6. Which of the following is true for the reaction? H2O (l) ↔ H2O (g) at 100° C and 1 atm pressure

(a) ∆S = 0
(b) ∆H = T ∆S
(c) ∆H = ∆U
(d) ∆H = 0

(a) ∆S = 0

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
c) isothermal 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. A refrigerator is a

a) heat engine working in backward direction
b) air cooler
c) an electric motor
d) heat engine

a) heat engine working in backward direction

Q20. The temperature of source and sink of a heat engine are 127ºC and 27ºC respectively. An inventor claims its efficiency to be 26%, then:

a) it is impossible
b) it is possible with high probability
c) it is possible with low probability
d) data are insufficient

a) it is impossible

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

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

a) Work
b) Temperature
c) Pressure
d) Volume

a) Work

## MCQ Questions for Class 11 Physics Multiple Choice Questions with Answers

CBSE RBSE Gujarat Board UP Board Bihar Board MP Board Hariyana Board Panjab Board NCERT Objective MCQ Questions of Class 11 Physics with Answers PDF.