Physics Thermal Properties of Matter

If the absolute temperature of hot black body is raised by 2%, by how much percentage rate of heat energy radiated would be increased nearly?

The latent heat of vaporisation of substance is

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The velocity of liquid coming out of a small hole of a large vessel containing two different liquids shown in figure is

The velocity of liquid coming out of a small hole of a large vessel containing two different liquids shown in figure is

Which of the following combination of properties would be desirable for handling a cooking pan?

The temperature of the black body as calculated from the graph is (Wien's constant = $2.89*{10}^{-3}$ )

A black body at  $227^{o}C$ radiates heat at the rate of 7 $cals/c{m}^{2}s$ . At a temperature of $727^{o}C$ , the rate of heat radiated in the same units will be

A liquid of coefficient of cubical expansion $\gamma$  is filled in a container having coefficient of linear expansion $\frac{\gamma }{3}.$  On heating, liquid level in the container will

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : When a rod lying freely is heated, no thermal stress is developed in it.

Reason R : On heating, the length of the rod increases.

In the light of the above statements, choose the correct answer from the options given below: