NEET UG PHYSICS Multiple Choice Questions (MCQs)
NEET UG Physics - Thermodynamics MCQs
NEET UG - Thermodynamics MCQs (106 to 120)
106. What does the Zeroth law of thermodynamics state?
a) Heat flows from low to high temperature
b) Heat flows from high to low temperature
c) If two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other
d) Energy cannot be created or destroyed
Answer: c) If two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other
107. The unit of temperature in the SI system is:
a) Fahrenheit
b) Celsius
c) Kelvin
d) Rankine
Answer: c) Kelvin
108. Which of the following quantities remains constant in an isothermal process?
a) Temperature
b) Pressure
c) Volume
d) Internal energy
Answer: a) Temperature
109. In an adiabatic process, which of the following is true?
a) Heat is exchanged with the surroundings
b) No heat is exchanged with the surroundings
c) Internal energy remains constant
d) Temperature increases due to compression
Answer: b) No heat is exchanged with the surroundings
110. According to the first law of thermodynamics, the change in internal energy of a system is equal to:
a) Heat supplied to the system
b) Work done by the system
c) Sum of heat added to the system and work done on the system
d) Heat supplied minus the work done by the system
Answer: c) Sum of heat added to the system and work done on the system
111. In which of the following processes is the work done by the system zero?
a) Isothermal process
b) Isochoric process
c) Adiabatic process
d) Isobaric process
Answer: b) Isochoric process
112. The second law of thermodynamics implies that:
a) Energy is conserved in all processes
b) Heat spontaneously flows from cold bodies to hot bodies
c) The total entropy of an isolated system always increases
d) Work done by the system is always positive
Answer: c) The total entropy of an isolated system always increases
113. A heat engine operates in a cycle and performs 500 J of work. If 1500 J of heat is supplied to it, what is the efficiency of the engine?
a) 25%
b) 33%
c) 50%
d) 67%
Answer: b) 33%
114. In a reversible process, the entropy change of the system is:
a) Zero
b) Positive
c) Negative
d) Dependent on the temperature change
Answer: a) Zero
115. In an irreversible process, the entropy of the system:
a) Remains constant
b) Decreases
c) Increases
d) Is unaffected by the process
Answer: c) Increases
116. In the first law of thermodynamics, the change in internal energy is equal to:
a) Heat supplied to the system
b) Work done by the system
c) Sum of heat added to the system and work done on the system
d) Heat supplied minus the work done by the system
Answer: d) Heat supplied minus the work done by the system
117. In an isothermal expansion of an ideal gas, the temperature of the system:
a) Increases
b) Decreases
c) Remains constant
d) Fluctuates
Answer: c) Remains constant
118. A Carnot engine operates between two reservoirs at temperatures of 500 K and 300 K. The efficiency of the engine is:
a) 40%
b) 50%
c) 60%
d) 80%
Answer: b) 50%
119. The process in which there is no change in temperature but work is done by the system is called:
a) Isochoric process
b) Isobaric process
c) Isothermal process
d) Adiabatic process
Answer: c) Isothermal process
120. The amount of heat required to raise the temperature of a unit mass of a substance by 1°C is called:
a) Latent heat
b) Specific heat capacity
c) Heat capacity
d) Thermal conductivity
Answer: b) Specific heat capacity
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