Transfer of Heat
Like light rays, heat radiations also obey
law of friction
law of reflection
law of motion
law of refraction
law of reflection
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The thermal conductivity of plastic foam isA. 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
As compared to non-metals, heat reaches from the hot part to the cold parts of the metal objects
A. slowly
B. quickly
C. equal time
D. none 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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