Thermal Physics - Thermodynamics
Q. The efficiency of a Carnot engine depends on: (2022)
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A.
The temperature of the hot reservoir only
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B.
The temperature of the cold reservoir only
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C.
The temperatures of both the hot and cold reservoirs
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D.
The type of working substance used
Solution
The efficiency of a Carnot engine is determined by the temperatures of both the hot and cold reservoirs, given by the formula η = 1 - (T_c/T_h).
Correct Answer: C — The temperatures of both the hot and cold reservoirs
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Q. The specific heat capacity of a substance is defined as: (2023)
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A.
The amount of heat required to raise the temperature by 1 degree Celsius
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B.
The amount of heat required to change the phase of a substance
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C.
The heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius
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D.
The heat required to raise the temperature of 1 mole of the substance by 1 degree Celsius
Solution
The specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius.
Correct Answer: C — The heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius
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Q. Which law states that the entropy of an isolated system always increases? (2021)
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A.
Zeroth law of thermodynamics
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B.
First law of thermodynamics
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C.
Second law of thermodynamics
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D.
Third law of thermodynamics
Solution
The second law of thermodynamics states that the entropy of an isolated system will always increase over time.
Correct Answer: C — Second law of thermodynamics
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