The temperature of a solid object is observed to be constant during a period. In the period
(i) heat may have been supplied to the body.
(ii) heat may have been extracted from the body.
(iii) no heat is supplied to the body.
(iv) no heat is extracted from the body.

Q. The temperature of an object is observed to rise in a period. In this period
(i) heat is certainly supplied to it.
(ii) heat is certainly not supplied to it.
(iii) heat may have been supplied to it.
(iv) work may have been done on it.

Q. If heat is supplied to a solid, its temperature
(i) must increase.
(ii) may increase.
(iii) may remain same.
(iv) may decrease.

Q. Heat and work are equivalent. This means,

(a) when we supply heat to a body we do work on it
(b) when we do work on a body we supply heat to it
(c) the temperature of a body can be increased by doing work on it
(d) a body kept at rest may be set into motion along a line by supplying heat to it

Q. Intensity of heat radiation emitted by body is believed to be proportional to fourth power of absolute temperature of the body. The proportionality constant also known as Boltzmann's constant may have possible value of :

Q.

A solid at initial temperature $0{}^{\circ }C$ is heated. A graph showing changes to the heat supplied is given below. What is the mass of solid substance? [Specific heat capacity of solid: $500J/kgK$]