Free Thermodynamics MCQs with Answers
714 Thermodynamics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.
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Read the Thermodynamics notesFree MDCAT chapter notes with key terms714 questions · page 16 of 36
- A. 4/3
- B. 2
- C. 5/3
- D. 3/2
Explanation: PV=nRT P∝T^3 P∝(PV)^3 k= P^2 V^3 PV^3/2 ; k = 3/2
Correct answer: 3/2- A. A2/3Q
- B. B1/3Q
- C. CQ/2
- D. D2Q/5
Explanation: ΔU = nCV ΔTΔQ = nCP ΔTHence (ΔU / ΔQ) = (CV / CP)For monoatomic gas, (CP / CV) = (5/3)∴ (ΔU / ΔQ) = (3/5) i.e.
Correct answer: D2Q/5- A. Solid > gas > liquid
- B. Gas > liquid > solid
- C. Solid > liquid > gas
- D. Gas > solid < liquid
Explanation: Solids have the greatest fraction of internal energy due to molecular vibration, followed by liquids and then gases.
Correct answer: Solid > liquid > gas- A. Transition only
- B. Translational and rotation only
- C. Translation and vibrational only
- D. Translation, rotation, and vibrational
Explanation: The total molar specific heat for a diatomic gas includes contributions from both translational and rotational degrees of freedom, while…
Correct answer: Translation, rotation, and vibrational- A. 0.7524𝐽
- B. 7524𝐽
- C. 95.24𝐽
- D. 752.4𝐽
Explanation: We use the formula E= nC x (change in temperature) i.e 10 x 75.24 x 10 = 7524 J
Correct answer: 7524𝐽- A. Zero
- B. Infinite
- C. Negative
- D. Remains constant
Explanation: The specific heat of a gas in an adiabatic process is zero because there is no external pressure for the gas to expand against, the work…
Correct answer: Zero- A. dQ/dV
- B. dQ/dT
- C. dU/dT
- D. dU/dV
Explanation: Heat capacity is the amount of heat added to a substance to raise its temperature by one kelvin.
Correct answer: dQ/dT- A. R/3
- B. 3/2 R
- C. 2R
- D. 3R
Explanation: Cp-Cv=nR Where n= no. of moles, hence Cp-Cv=3R making D the correct option.
Correct answer: 3R- A. He
- B. Ar
- C. Aluminium
- D. Neon
Explanation: For aluminum, the difference between Cp and Cv is relatively small because the metal has a high bulk modulus, which means that it is…
Correct answer: Aluminium- A. dQ/dN
- B. dQ/dP
- C. dU/dT
- D. dU/dV
Explanation: c) dU/dT: This expression represents the change in internal energy (U) per change in temperature (T) of a substance.
Correct answer: dU/dT- A. 10.6 J/Kmole
- B. 2.7 J/Kmole
- C. 13 J/Kmole
- D. 11.7 J/Kmole
Explanation: Cp/Cv=1.7 and Cp=20, then Cv =20/1.7=11.76 J/Kmole
Correct answer: 11.7 J/Kmole- A. nCp △T
- B. n(Cp + R) △T
- C. n(Cp - R) △T
- D. n(2Cp + R) △T
Explanation: This is the correct option. It represents the increase in internal energy of an ideal gas when the temperature is increased by ΔT\Delta…
Correct answer: n(Cp - R) △T- A. Cv
- B. R
- C. Cp - Cv
- D. R + Cv
Explanation: The correct answer is Cv, as it represents the specific heat at constant volume.
Correct answer: Cv- A. Volume
- B. Pressure
- C. Entropy
- D. Internal energy
Explanation: Internal energy Explanation: The change in internal energy (ΔU) of an ideal gas at constant volume is given by ΔU = nCvΔT, where n is the…
Correct answer: Internal energy- A. Equal to minus one
- B. Equal to zero
- C. Greater than one
- D. Less than one
- E. Equal to one
Explanation: The ratio of molar specific heat at constant pressure (Cp) to molar specific heat at constant volume (Cv) for an ideal gas is given by: γ…
Correct answer: Greater than one- A. J.kg K-1
- B. J.kg2 K
- C. J.kg-1 K-1
- D. J.kg-1.K
- E. J.Kg.K
Explanation: Specific heat capacity of a gas is measured in J.kg-1 K-1 . So the correct option is C.
Correct answer: J.kg-1 K-1- A. J kg^-1 K^-1
- B. J Kg
- C. J kg-1 C
- D. Jg-1 C-1
Explanation: The SI unit of specific heat capacity is J kg^-1 K^-1.
Correct answer: J kg^-1 K^-1- A. 935J
- B. 934J
- C. 967J
- D. 954J
Explanation: Mass of nitrogen, m = 0.02 kg = 2×10-2×103Rise in temperature, ΔT=45oCMolecular mass of N2 ,M=28Universal gas constant, R=8.3J/molKNumber…
Correct answer: 934J- A. R/3
- B. 3/2 R
- C. 2R
- D. 3R
Explanation: Cp-Cv=nRWhere n= no. of moles, henceCp-Cv=3R making D the correct option.
Correct answer: 3R- A. 82.5 Cal
- B. 80 Cal
- C. 85.7 Cal
- D. 58.8 Cal
Explanation: Cp and CV for a diatomic gas is 7/2 R and 5/2 R respectively. The gas's internal energy is increase by only 0.71 of the supplied energy.
Correct answer: 85.7 Cal