Thermodynamics and Heat CDS Questions

CDS Physics

Thermodynamics and Heat MCQ Questions


13.
The SI unit of heat (as a form of energy) is the:
A.
Kelvin
B.
Watt
C.
Calorie
D.
Joule
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ANSWER :
D. Joule
14.
Conduction, one of the three primary modes of heat transfer, occurs primarily through:
A.
The transfer of heat through electromagnetic waves, requiring no medium at all
B.
The bulk movement of a heated fluid (liquid or gas)
C.
The transfer of heat through a material medium via molecular collisions, without any actual bulk movement of the medium itself
D.
The chemical transformation of matter into energy
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ANSWER :
C. The transfer of heat through a material medium via molecular collisions, without any actual bulk movement of the medium itself
15.
Which of the following materials is generally the BEST conductor of heat among common substances?
A.
Rubber
B.
Air
C.
Silver
D.
Wood
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ANSWER :
C. Silver
16.
Materials that conduct heat poorly, and are therefore commonly used to prevent heat loss or gain, are known as:
A.
Thermal conductors
B.
Thermal insulators
C.
Semiconductors
D.
Superconductors
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ANSWER :
B. Thermal insulators
17.
Convection, as a mode of heat transfer, occurs primarily in which states of matter?
A.
Only in superconducting materials at extremely low temperatures
B.
Exclusively in a vacuum, with no medium required
C.
Liquids and gases (fluids), where heated portions of the fluid physically move and carry thermal energy with them
D.
Exclusively in solids, through molecular vibration alone
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ANSWER :
C. Liquids and gases (fluids), where heated portions of the fluid physically move and carry thermal energy with them
18.
Land and sea breezes, a common meteorological phenomenon observed in coastal regions, are primarily caused by which mode of heat transfer?
A.
Radiation directly from the Sun to the human body
B.
Conduction through the ocean floor
C.
Sublimation of water vapour
D.
Convection (driven by the differential heating and cooling of land and sea surfaces)
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ANSWER :
D. Convection (driven by the differential heating and cooling of land and sea surfaces)