The diagram below shows the change of phases of a substance on a temperature vs time graph on heating the substance at a constant rate.

What is the boiling and melting point of the substance ?

The diagram below shows the change of phases of a substance on a temperature vs time graph on heating the substance at a constant rate. Why is the slope of CD less than slope of AB ?

What do you understand by ‘triple point’ of a substance?

For any substance, why does the temperature remains constant during the change of state?

Which substance has the highest melting point ?

A substance has nearly zero resistance at a temperature of 1 K What is such a substance called?

Why does the temperature of a substance remain constant during its melting point or boiling point ?

(a) What do you understand by the change of phase of a substance ? (b) Is there any change in temperature during the change of phase ? (c) Does the substance absorb or liberate any heat energy during the change of phase ? (d) What is the name given to the energy absorbed during a phase change ?

The graph shown in the figure represents change in the temperature of 5 kg of a substance as it absorbs heat at a costant rate of 42 kJ "min"^(-1) . The latent heat of vaporization of the substance is :

What will be the change in the rate of radioactivity if the temperature of the radioactive substance is raised to four times the initial temperature?