The diameter of ball P is three times that of another ball Q of the same material. P and Q are heated to same temperature and allowed to cool up to the room temperature. The relation between their rates of cooling will be :

A solid sphere and a hollow sphere of same material and size are heated to same temperature and allowed to cool in the same surroundings. If the temperature difference between each sphere and its surrounding is T, then

A sphere and a cube of same material and same volume are heated up to same temperature and allowed to cool in the same sorroundings. The radio of the amounts of radiations emitted in equal time intervals will be

Two spheres of same material and radius r and 2r are heated to same temperature and are kept in identical surroundings, ratio of their rate of loss of heat is

"A solid sphere of copper of radius R and a hollow sphere of the same material of inner radius r and outer radius R are heated to the same temperature and allowed to cool in the same environment. Which of them starts cooling faster ?''

Two solid spheres of radii R_(1) and R_(2) are made of the same material and have similar surfaces. These are raised to the same temperature and then allowed to cool under identical conditions. The ratio of their initial rates of loss of heat are

Statement-1: There are two spheres made of same amount of material, one of them is hollow and other is solid. They are heated to same temperature and left in identical surroundigs. The initial rate of cooling will be greater for hollow sphere. Statement-2: The rate of heat loss depends on surface area and temperature.

The ratio of the diameters of two metallic rods of the same material is 2 : 1 and their lengths are in the ratio 1 : 4 . If the temperature difference between their ends are equal, the rate of flow of heat in them will be in the ratio

A solid cube of side a and another solid cube of same material and dimension, having spherical cavity of radius (b lt a) , are heated to same temperature and allowed to cool. Then

If a piece of metal is heated to temperature theta and the allowed to cool in a room which is at temperature theta_0 , the graph between the temperature T of the metal and time t will be closet to

A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling