Physics Thermal Properties of Matter

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:

At what temperature a gold ring of diameter 6.230cm be heated so that it can be fitted on a wooden bangle of diameter. 6.241cm? Both the diameters have been measured at room temperature (27°C).

(Given : coefficient of linear thermal expansion of gold a_L = 1.4 * 10^-5 K^-1)

At what temperature a gold ring of diameter 6.230cm be heated so that it can be fitted on a wooden bangle of diameter. 6.241cm? Both the diameters have been measured at room temperature (27°C).

(Given : coefficient of linear thermal expansion of gold a_L = 1.4 * 10^-5 K^-1)

Two rods of length d₁ and d₂ and coefficients of thermal conductivities K₁ and K₂ are kept touching each other. Both have the same area of cross?section, the equivalent thermal conductivity is