Q. In a Carnot engine, if the hot reservoir is at 500 K and the cold reservoir is at 300 K, what is the maximum efficiency?
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A.
40%
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B.
60%
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C.
50%
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D.
20%
Solution
The maximum efficiency of a Carnot engine is given by 1 - (T_c/T_h), which is 1 - (300/500) = 0.4 or 40%.
Correct Answer:
B
— 60%
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Q. In an ideal gas, what is the relationship between pressure and temperature at constant volume?
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A.
Directly proportional
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B.
Inversely proportional
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C.
No relationship
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D.
Exponential relationship
Solution
According to Gay-Lussac's Law, pressure is directly proportional to temperature at constant volume.
Correct Answer:
A
— Directly proportional
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Q. What is the change in entropy when 1 kg of ice at -10°C is converted to water at 0°C?
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A.
0 J/K
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B.
333 J/K
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C.
1000 J/K
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D.
2000 J/K
Solution
The change in entropy during the melting of ice is approximately 333 J/K.
Correct Answer:
B
— 333 J/K
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Q. What is the entropy change when 1 mole of an ideal gas expands isothermally and reversibly from volume V1 to V2?
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A.
R ln(V2/V1)
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B.
R (V2 - V1)
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C.
0
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D.
R ln(V1/V2)
Solution
The entropy change for an isothermal and reversible expansion is given by ΔS = R ln(V2/V1).
Correct Answer:
A
— R ln(V2/V1)
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Q. What is the primary mechanism of heat transfer in fluids?
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A.
Conduction
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B.
Convection
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C.
Radiation
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D.
Insulation
Solution
The primary mechanism of heat transfer in fluids is convection.
Correct Answer:
B
— Convection
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Q. What is the thermal expansion coefficient of a material?
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A.
The change in volume per degree change in temperature
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B.
The change in length per degree change in temperature
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C.
The change in pressure per degree change in temperature
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D.
The change in density per degree change in temperature
Solution
The thermal expansion coefficient is defined as the change in length per degree change in temperature.
Correct Answer:
B
— The change in length per degree change in temperature
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Q. Which of the following processes is an example of heat transfer by conduction?
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A.
Boiling water
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B.
Heating a metal rod
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C.
Radiation from the sun
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D.
Air circulation
Solution
Heating a metal rod is an example of heat transfer by conduction.
Correct Answer:
B
— Heating a metal rod
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