Physics Thermodynamics MCQs
1. Which of the following process is used to do maximum work done on the ideal gas if the gas is compressed to half of its initial volume?
(a) Isothermal
(b) Isochoric
(c) Isobaric
(d) Adiabatic
Answer: (d) Adiabatic
2. The coefficient performance of a refrigerator is 5. If the temperature inside the freezer is -20℃, calculate the heat rejected to the surrounding
(a) 11℃
(b) 41℃
(c) 21℃
(d) 31℃
Answer: (d) 31℃
3. Select the incorrect statement
(a) For the triple point of water, 1°K is equal to 1/273.16.
(b) The first law of thermodynamics is also known as the law of thermal equilibrium
(c) The triple point of water is one of the reference points on the thermodynamic scale of temperature
(d) At room temperature, the heat of combustion is not found
Answer: (d) At room temperature, the heat of combustion is not found
4. What is a necessary condition for a reaction to be spontaneous at all temperatures?
(a) ΔH < ΔG
(b) ΔG and ΔH should be positive
(c) ΔH = ΔG = 0
(d) ΔG and ΔH should be negative
Answer: (d) ΔG and ΔH should be negative
5. A gas is compressed to half of its initial volume isothermally. The same gas is compressed again until the volume reduces to half through an adiabatic process. Then
(a) Work done during isothermal compression is more
(b) Work done is independent of the processes used for compression
(c) Work done is more during the adiabatic process
(d) Work done is dependent on the atomicity of the gas
Answer: (c) Work done is more during the adiabatic process
6. Select the factor that affects the heat of reaction which is based on Kirchoff’s equation
(a) Molecularity
(b) Temperature
(c) Pressure
(d) Volume
Answer: (b) Temperature
7. For all the reactions what is the nature of the chemical dissociation?
(a) Exothermic
(b) Reversible
(c) Endothermic
(d) Reversible and endothermic
Answer: (d) Reversible and endothermic
8.Which of the following is the largest unit of energy
(a) Electron volt
(b) Joule
(c) Calorie
(d) Erg
Answer: (c) Calorie
