Entropy and thermodynamics MCQS

Here Are 50 Quizzes / Multiple-Choice Questions (Mcqs) On

THERMODYNAMICS
Along With Their Correct Answers



1. Which of the following is a state function in thermodynamics?

a) Heat

b) Work

c) Enthalpy

d) Entropy

**Correct answer: c) Enthalpy**



2. The First Law of Thermodynamics is based on the principle of:

a) Conservation of energy

b) Conservation of mass

c) Conservation of momentum

d) Conservation of temperature

**Correct answer: a) Conservation of energy**



3. The SI unit of heat is:

a) Joule

b) Watt

c) Newton

, d) Kilogram

**Correct answer: a) Joule**



4. Which process involves the transfer of heat without any change in
temperature?

a) Isothermal

b) Adiabatic

c) Isochoric

d) Isobaric

**Correct answer: b) Adiabatic**



5. The efficiency of a heat engine is given by:

a) (Qin - Qout) / Qin

b) W / Qout

c) 1 - (Qout / Qin)

d) W / Qin

**Correct answer: d) W / Qin**



6. Entropy is a measure of:

a) Internal energy

b) Disorder or randomness

c) Temperature

, d) Pressure

**Correct answer: b) Disorder or randomness**



7. The Carnot efficiency of an engine depends on:

a) Heat capacity

b) Temperature of the source and sink

c) Pressure of the working fluid

d) Volume of the cylinder

**Correct answer: b) Temperature of the source and sink**



8. The Second Law of Thermodynamics states that:

a) Energy cannot be created or destroyed

b) Heat flows from hot to cold spontaneously

c) The total entropy of an isolated system always decreases

d) Work done is equal to the change in internal energy

**Correct answer: b) Heat flows from hot to cold spontaneously**



9. The change in internal energy of a system is given by:

a) ΔU = Q - W

b) ΔU = Q + W

c) ΔU = Q / W

d) ΔU = W / Q