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


13.
Which of the following is true about the latent heat of vaporization?
A.
It is the heat required to change a liquid into a gas
B.
It is the heat required to change a solid into a liquid
C.
It is the heat released when a gas turns into a liquid
D.
Both a) and c)
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ANSWER :
D. Both a) and c)
14.
What is the latent heat of sublimation?
A.
The heat required to change a solid into a gas
B.
The heat required to change a gas into a solid
C.
Both a) and b)
D.
The heat required to change a solid into a liquid
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ANSWER :
C. Both a) and b)
15.
Which of the following statements about latent heat is true?
A.
It is the heat required to change the state of a substance without changing its temperature
B.
It is the heat required to raise the temperature of a substance
C.
It is the heat released during a phase change
D.
It is the heat absorbed during a phase change
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ANSWER :
A. It is the heat required to change the state of a substance without changing its temperature
16.
What is the term used to describe the change of a gas into a solid without passing through the liquid phase?
A.
Deposition
B.
Solidification
C.
Condensation
D.
Sublimation
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ANSWER :
A. Deposition
17.
What happens to the density of water as it is heated from 0°C to 4°C?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It fluctuates
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ANSWER :
C. It increases
18.
What is the process by which a solid changes directly into a gas without becoming a liquid?
A.
Sublimation
B.
Solidification
C.
Condensation
D.
Melting
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ANSWER :
A. Sublimation