Free Molar Specific Heat of a Gas MCQs with Answers
98 Molar Specific Heat of a Gas MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Molar specific heat is the heat required to raise the temperature of one mole of a gas by one kelvin, expressed through Q = nCΔT. Questions compare the constant volume value Cv with the constant pressure value Cp, apply the ideal gas relation Cp − Cv = R, and identify how the thermodynamic process affects heat capacity.
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98 questions · page 5 of 5
- A. 5/3
- B. 8/6
- C. 7/5
- D. 9/7
Explanation: The value of γ (gamma) for a gas is derived from the formula γ=1+2/f, where f is the number of degrees of freedom.
Correct answer: 9/7- A. Thermal conductivities
- B. Coefficients of expansion
- C. Densities
- D. Heat capacities
Explanation: The correct answer is that the samples have different specific heat capacities.
Correct answer: Heat capacities- A. Linear motion and rolling motion
- B. rolling motion and linear motion
- C. Linear motion and rotatory motion
- D. rotatory motion and linear motion
Explanation: The internal energy of a monatomic gas is due to linear motion only and that of the diatomic gas is due to rolling (linear rotatory)…
Correct answer: Linear motion and rolling motion- A. 4RT
- B. 5RT
- C. 15RT
- D. 11RT
Explanation: This is the following solution: (students must learn the formula)
Correct answer: 11RT- A. ∞
- B. Zero
- C. Finite but not zero
- D. 0<C<∞
Explanation: The correct answer is B because in an adiabatic process, there is no heat exchange (Q = 0) between the gas and its surroundings.
Correct answer: Zero- A. Specefic heat
- B. Molar specfic heat capacity at constant pressure
- C. Molar heat capacity at constant pressure
- D. Heat capacity at constant pressure
Explanation: The amount of heat required to raise the temperature of one mole of a substance through one Kelvin at constant pressure is "Molar heat…
Correct answer: Molar heat capacity at constant pressure- A. A
- B. B
- C. C
- D. All have equal specefic heat
Explanation: The substance which gets heated more or under application of heat for a longer period of time, is expected to have a greater specific heat…
Correct answer: C- A. Cp −Cv =R
- B. CP /Cv =γ
- C. Cv −Cp =R
- D. Both a and b
Explanation: Both options (a) and (b) are correct. The first one (Cp −Cv =R) represents the difference between the molar-specific heat capacities at…
Correct answer: Both a and b- A. 2 / 5 R
- B. 2 / 7 R
- C. 5 / 2 R
- D. 7 / 2 R
Explanation: Since Cp - Cv = Rhence , X - 5/2 R = RX = 7/2 R
Correct answer: 7 / 2 R- A. 82.5 Cal
- B. 80 Cal
- C. 85.2 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: 85.2 Cal- A. Diatomic
- B. Mixture of diatomic and polyatomic
- C. Mono atomic
- D. Polyatomic
Explanation: The correct answer is C because a gas with (R/Cv) = 0.67 indicates that the gas behaves as a monoatomic gas.
Correct answer: Mono atomic- A. Be halved.
- B. Be doubled.
- C. Remain constant.
- D. Vary unpredictably.
Explanation: The specific heat of a gas, defined as the amount of heat required to change the temperature of a unit mass of the gas by one degree, is a…
Correct answer: Remain constant.- A. 200 J/kgoC.
- B. 100 J/kgoC.
- C. 22.2 J/kgoC.
- D. 11.7 J/kgoC.
Explanation: Q = mcΔTWhere: * Q = Thermal energy transferred (in Joules, J) * m = Mass of the substance (in kilograms, kg) * c = Specific heat capacity…
Correct answer: 200 J/kgoC.- A. Cp = Cv + R/M
- B. Cp = R/Cv
- C. Cp = γ * R
- D. Cp = Cv * M
Explanation: To find the specific heat at constant pressure per gram of a gas with molar mass M, we start with the fundamental thermodynamic relations…
Correct answer: Cp = Cv + R/M- A. A
- B. B
- C. C
- D. D
Explanation: The average translational energy of a molecule is given by the equipartition theorem as, E=3kT2 where k is the Boltzmann constant and T is…
Correct answer: A- A. Cp < Cv
- B. Cp = Cv
- C. Cp > Cv
- D. Cp = Constant
Explanation: So, Cp is greater than Cv, and Cp - Cv = R is a representation of this relationship for ideal gases.
Correct answer: Cp > Cv- A. 1.5
- B. 44319
- C. 44257
- D. 44289
Explanation: Answer: 1.5Given that, p∝T³ or pT^-3 = constant .....(i) Also for adiabatic process pV^Γ = constant but pV=RT (ideal gas law) or V= RT/p…
Correct answer: 1.5- A. 8.314 Jmol-1K-1
- B. 8.324 Jmol-1K-1
- C. 7.23 Jmol-1K-1
- D. 1.00 Jmol-1K-1
Explanation: The correct value of the universal gas constant is 8.314 J/mol·K, which is used in the ideal gas law equation PV=nRT.
Correct answer: 8.314 Jmol-1K-1