Quiz for Entropy

Q1: What does entropy measure in a system?

A. Energy B. Disorder C. Temperature D. Heat content

Q2: Which of the following processes increases entropy?

A. Freezing of water B. Condensation of steam C. Melting of ice D. Compression of gas

Q3: In a reversible process, the total change in entropy of the system and surroundings is:

A. Positive B. Negative C. Zero D. Infinite

Q4: Entropy of a perfectly crystalline substance at absolute zero is:

A. Maximum B. Minimum C. Zero D. Infinite

Q5: Which process is associated with maximum entropy change?

A. Isothermal expansion B. Adiabatic compression C. Free expansion D. Isobaric process

Q6: Which of the following is a spontaneous process?

A. Water freezing at 25°C B. Ice melting at 25°C C. Heat flowing from cold to hot D. None of these

Q7: Entropy change is given by ΔS =

A. ΔQ × T B. ΔQ/T C. T/ΔQ D. ΔQ - T

Q8: Entropy is a:

A. Scalar quantity B. Vector quantity C. Tensor quantity D. None of these

Q9: Which process has zero entropy change?

A. Irreversible process B. Reversible isothermal process C. Melting of ice D. Free expansion

Q10: When entropy of the universe increases, the process is:

A. Impossible B. Reversible C. Spontaneous D. Equilibrium

Q11: The unit of entropy in SI is:

A. Joule B. Kelvin C. Joule/Kelvin D. Watt

Q12: Which is true for an isolated system?

A. Entropy can decrease B. Entropy remains constant C. Entropy always increases D. Entropy is negative

Q13: If entropy decreases in a system, what happens in surroundings?

A. No effect B. Entropy also decreases C. Entropy increases D. Temperature rises

Q14: Which gas expansion will result in more entropy change?

A. Expansion of helium B. Expansion of CO₂ C. Expansion of O₂ D. All same

Q15: Entropy is maximum at:

A. Solid phase B. Liquid phase C. Gaseous phase D. Plasma phase

Q16: Entropy increases when:

A. Heat is added reversibly B. Heat is removed reversibly C. Work is done on the system D. Volume is constant

Q17: Second law states that entropy of universe tends to:

A. Decrease B. Remain same C. Become negative D. Increase

Q18: Entropy is not defined for:

A. Solids B. Liquids C. Ideal gases D. Nonequilibrium states

Q19: Entropy change in irreversible process is:

A. Positive B. Negative C. Zero D. Imaginary