Measurement of Temperature and Heat, Change of State and Latent Heat, Modes of Heat Transfer NDA Questions

NDA Physics

Measurement of Temperature and Heat, Change of State and Latent Heat, Modes of Heat Transfer MCQ Questions


7.
What is the SI unit of thermal conductivity?
A.
Joule
B.
Watt
C.
Watt per meter per Kelvin
D.
Kelvin
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ANSWER :
C. Watt per meter per Kelvin
8.
What happens to the volume of a substance when it is heated?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It fluctuates
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ANSWER :
C. It increases
9.
What is the relation between Celsius and Kelvin scales?
A.
°C = K - 273.15
B.
K = °C - 273.15
C.
K = °C + 273.15
D.
°C = K + 273.15
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ANSWER :
C. K = °C + 273.15
10.
The heat released when a gas condenses into a liquid is known as
A.
Latent heat of vaporization
B.
Latent heat of condensation
C.
Latent heat of fusion
D.
Latent heat of sublimation
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ANSWER :
B. Latent heat of condensation
11.
The heat required to convert a solid into a liquid is known as
A.
Latent heat of fusion
B.
Latent heat of vaporization
C.
Latent heat of sublimation
D.
Latent heat of deposition
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ANSWER :
A. Latent heat of fusion
12.
What happens to the temperature of a substance when it undergoes a phase change?
A.
It remains constant
B.
It increases
C.
It decreases
D.
It fluctuates
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ANSWER :
A. It remains constant