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1.	According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
Answer» Answer: D) T The Stefan–Boltzmann law DESCRIBES the power RADIATED from a black body in terms of its temperature. Specifically, the Stefan–Boltzmann law states that the total energy radiated per unit SURFACE area of a black body across all wavelengths per unit time is directly proportional to the FOURTH power of the black body's temperature. So the correct answer is option D) T

According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

Answer»

Answer: D) T

The Stefan–Boltzmann law DESCRIBES the power RADIATED from a black body in terms of its temperature.
Specifically, the Stefan–Boltzmann law states that the total energy radiated per unit SURFACE area of a black body across all wavelengths per unit time is directly proportional to the FOURTH power of the black body's temperature.

So the correct answer is option D) T

Discussion

2.	Thermal conductivity of water at 20°C is of the order of
Answer» 0.51 Thermal CONDUCTIVITY of WATER at 20°C is of the ORDER of 0.51

Thermal conductivity of water at 20°C is of the order of

Answer»

0.51

Thermal CONDUCTIVITY of WATER at 20°C is of the ORDER of 0.51

Discussion

3.	Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of
Answer» Answer:B) 0.02 Explanation: The thermal conductivity at ROOM TEMPERATURE is quantity of HEAT utransmitted by unit of a material in diretion normal to surface of unit.

Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

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Answer:B) 0.02

Explanation:

The thermal conductivity at ROOM TEMPERATURE is quantity of HEAT utransmitted by unit of a material in diretion normal to surface of unit.

Discussion

4.	Thermal conductivity of non-metallic amorphous solids with decrease in temperature
Answer» Answer: B) DECREASE s explanation: Thermal conductivity of NON METALLIC SOLID amorphous decrease with increase in temperature as the liquid expand the molecules move aparts. At there electronic conductivity is practically non existent and DUE to increase in phonon conditions, thermal conductivity get increased.

Thermal conductivity of non-metallic amorphous solids with decrease in temperature

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Answer: B) DECREASE s

explanation: Thermal conductivity of NON METALLIC SOLID amorphous decrease with increase in temperature as the liquid expand the molecules move aparts.

At there electronic conductivity is practically non existent and DUE to increase in phonon conditions, thermal conductivity get increased.

Discussion

5.	The critical temperature is the temperature
Answer» Answer: D) above which a gas will never liquefied. Explanation: It is a TEMPERATURES at which vapors of a gas can't be liquefied. No matter that how MUCH PRESSURE is applied on it. Every GASSES have a critical TEMPERATURE.

The critical temperature is the temperature

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Answer: D) above which a gas will never liquefied.

Explanation: It is a TEMPERATURES at which vapors of a gas can't be liquefied.

No matter that how MUCH PRESSURE is applied on it. Every GASSES have a critical TEMPERATURE.

Discussion