Two bodies $A$ and $B$ are placed in an evacuated vessel maintained at a temperature of $27°\mathrm{C}$. The temperature of $A$ is $327°\mathrm{C}$ and that of $B$ is $227°\mathrm{C}$. The ratio of heat loss from $A$ and $B$ is about

Consider the following statements about a thermos flask.

I. It is a practical device in which the heat flowing into or out of the system by conduction, convection, or radiation is reduced as much as possible.

II. It consists of a double-walled glass vessel.

III. In a thermos flask, the heat transfers by convection is minimized by silvering the surfaces, and that by radiation is minimized by evacuating the space between the walls. Of these statements

Which of the following are factors upon which the amount of heat radiated from a body depends?

I. Excess temperature of the body over surroundings.

II. Density of the body.

III. Exposed area of the body.

IV. Nature of the surface of the body

Choose the correct answer from the codes given below.