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Heat and Mass Transfer

Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

I²
Absolute temperature (T)
F
T

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Heat and Mass Transfer
Which of the following has least value of conductivity?

Glass
Plastic
Water
Air

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Heat and Mass Transfer
All radiations in a black body are

Transmitted
Refracted
Absorbed
Reflected

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Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

Increases
Remain constant
Decreases
May increase or decrease depending on temperature

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Heat and Mass Transfer
Planck’s law holds good for

black bodies
all coloured bodies
polished bodies
All of these

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissivity
Emissive power
Absorptive power
Absorptivity

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