Transfer of Heat
As compared to non-metals, heat reaches from the hot part to the cold parts of the metal objects
slowly
quickly
equal time
none of above
quickly
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Like light rays, heat radiations also obeyA. law of friction
B. law of reflection
C. law of motion
D. law of refraction
The thermal conductivity of plastic foam is
A. 0.05
B. 0.03
C. 0.02
D. 0.06
When temperature of an object is lower than its surroundings then as compare to absorbing, it is radiating
A. more heat
B. less heat
C. equal heat
D. zero heat
Central heating systems in buildings work on the principle of
A. convection
B. radiation
C. conduction
D. all of above
The amount of heat that flows in unit time is called the heat’s
A. rate on indicacy
B. rate of stress
C. flow of heat
D. rate of power
Thermal energy from a hot body flows to a cold body in the form of
A. sound
B. signals
C. heat
D. waves
Heat transfers in
A. 3 ways
B. 2 ways
C. 4 ways
D. 5 ways
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