Thermodynamic and Statistical Physics

JKPSC Assistant Professor (Physics) · Physics · 58 practice questions with answers and explanations: 8 Easy, 50 Medium, 0 Hard.

Sample questions

Sample Easy question 1

Wien's displacement law gives the wavelength of peak emission as:

  1. λ_max/T = constant
  2. λ_max = T constant
  3. λ_max T² = constant
  4. λ_max T = constant
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Answer: D. Hotter bodies peak at shorter wavelengths.

Sample Easy question 2

Which thermodynamic potential is minimised at equilibrium at constant T and P?

  1. Helmholtz free energy
  2. Gibbs free energy
  3. Internal energy
  4. Enthalpy
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Answer: B. G = H − TS.

Sample Easy question 3

The first law of thermodynamics expresses the conservation of:

  1. Entropy
  2. Energy
  3. Momentum
  4. Charge
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Answer: B. ΔU = Q − W.

Sample Medium question 4

The Gibbs free energy is defined as:

  1. F = U − TS
  2. G = H − TS
  3. G = TS
  4. G = U + PV
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Answer: B. It is minimum at fixed T and P.

Sample Medium question 5

The enthalpy is defined as:

  1. H = TS
  2. H = U − PV
  3. H = F + TS
  4. H = U + PV
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Answer: D. It is useful at constant pressure.

Sample Medium question 6

A Maxwell relation is:

  1. (∂T/∂V)_S = (∂P/∂S)_V
  2. (∂S/∂V) = 0
  3. (∂T/∂V)_S = −(∂P/∂S)_V
  4. (∂T/∂P) = 0
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Answer: C. They come from exact differentials.

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