JEE PHYSICS UNIT 08
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The first law of thermodynamics is a statement of
A. Conservation of energy
B. Conservation of mass
C. Conservation of momentum
D. Conservation of entropy
2. The internal energy of an ideal gas depends on
A. Pressure only
B. Temperature only
C. Volume only
D. Pressure and volume
3. The process in which no heat is exchanged between the system and surroundings is called
A. Isothermal
B. Adiabatic
C. Isochoric
D. Isobaric
4. For an isothermal process, the change in internal energy of an ideal gas is
A. Zero
B. Positive
C. Negative
D. Infinity
5. Work done during an isothermal expansion of an ideal gas is given by
A. nRT ln(Vf/Vi)
B. -nRT ln(Vf/Vi)
C. PV ln(Vf/Vi)
D. nRT (Vf - Vi)
6. In an adiabatic process, the relationship between pressure P and volume V is given by
A. PV = constant
B. P²V = constant
C. PV^γ = constant
D. PV/T = constant
7. The efficiency of a Carnot engine depends on
A. Source and sink temperatures
B. Work done
C. Heat absorbed
D. Heat rejected
8. The specific heat of a gas in an isothermal process is
A. Infinity
B. Zero
C. Negative
D. Positive
9. The total entropy change in a reversible cycle is
A. Positive
B. Negative
C. Zero
D. Infinity
10. A heat engine absorbs 100 J of heat and does 60 J of work. The efficiency of the engine is
A. 40%
B. 50%
C. 60%
D. 20%
11. The second law of thermodynamics states that
A. Entropy of the universe always decreases
B. Entropy of the universe always increases
C. Entropy of the universe remains constant
D. Work is completely converted into heat
12. The work done in an isochoric process is
A. Zero
B. Maximum
C. Minimum
D. Depends on the gas
13. The temperature at which the entropy of a perfect crystalline substance becomes zero is
A. 0°C
B. 273°C
C. 0 K
D. Infinity
14. A gas expands adiabatically. During this process
A. Temperature remains constant
B. Internal energy decreases
C. Pressure increases
D. No work is done
15. The ratio of Cp to Cv for an ideal gas is equal to
A. γ
B. 1/γ
C. 1
D. Zero
16. The internal energy change in an adiabatic process is equal to
A. Zero
B. Work done on or by the system
C. Heat absorbed
D. Entropy change
17. For an isothermal process, which quantity remains constant
A. Pressure
B. Volume
C. Temperature
D. Internal energy
18. The work done by an ideal gas during an isobaric expansion is
A. nRT ln(Vf/Vi)
B. P(Vf - Vi)
C. nCvΔT
D. Zero
19. The efficiency of a Carnot engine is 100% if
A. Source temperature is infinite
B. Sink temperature is infinite
C. Source and sink temperatures are equal
D. Sink temperature is zero
20. In a cyclic process, the total work done by the system is equal to
A. Change in internal energy
B. Heat supplied to the system
C. Heat rejected by the system
D. Net heat supplied to the system
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