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MCQs on Physics Thermodynamics :
1. Following is the diagram of the thermodynamic process. Refer the diagram and match the following
P Process – I (A) Adiabatic
Q Process – II (B) Isobaric
R Process – III (C) Isochoric
S Process – IV (D) Isothermal
(A) (P,c), (Q,d), (R,b), (S,a)
(B) (P,c), (Q,d), (R,b), (S,a)
(C) (P,a), (Q,c), (R,d), (S,b)
(D) (P,c), (Q,a), (R,d), (S,b)
Answer
Answer: (D) (P,c), (Q,a), (R,d), (S,b)
2. 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
Answer: (D) Adiabatic
3. ABCDA is a cyclic process explaining the thermodynamic process. What is the work done by the system in the cycle
(A) Zero
(B) (frac{rho_{0} V_{0}}{2})
(C) ρ0V0
(D) 2ρ0V0
Answer
Answer: (A) Zero
4. What is the ratio of (frac{C_{p}}{C_{v}}) for gas if the pressure of the gas is proportional to the cube of its temperature and the process is an adiabatic process.
(A) 2
(B) 3/2
(C) 4/3
(D) 5/3
Answer
Answer: (B) 3/2
5. 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
Answer: (D) 31℃
6. A thermodynamic system is explained with the help of the graph ABCD. What is the heat rejected by the system during the cycle?
(A) pV
(B) 2pV
(C) 4pV
(D) 1/2pV
Answer
Answer: (B) 2PV
7. 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
Answer: (D) At room temperature, the heat of combustion is not found
8. 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
Answer: (D) ΔG and ΔH should be negative
9. 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
Answer: (C) Work done is more during the adiabatic process
10. 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
Answer: (B) Temperature
11. For all the reactions what is the nature of the chemical dissociation?
(A) Exothermic
(B) Reversible
(C) Endothermic
(D) Reversible and endothermic
Answer
Answer: (D) Reversible and endothermic
12. Which of the following is the largest unit of energy
(A) Electron volt
(B) Joule
(C) Calorie
(D) Erg
Answer
Answer: (C) Calorie