Question Answers

The coefficients of thermal conductivity of copper, mercury and glass are respectively Kc, Km and Kg such that Kc > Km > kg. If the same quantity of heat is to flow per second Km and Kg such that Kc > Km > kg. If the same quantity of heat is to flow per second [...]

Two rods of same length and material transfer a given amount of heat in 12 seconds, when they are joined end to end. But when they are joined along their lengths, then they will then they will Two rods of same length and material transfer a given amount of heat in 12 seconds when they [...]

Two rectangular blocks A and B of different metals have same length and same area of cross-section. They are kept in such a way that their cross-sections touch each other. The temperature Two rectangular blocks A and B of different metals have same length and same area of cross-section. They are kept in such a [...]

Heat is flowing through a conductor of length l from x = 0 to x = l. If its thermal resistance per unit length is uniform, which of the following graphs is correct ? Heat is flowing through a conductor of length l from x = 0 to x = l. If its thermal resistance [...]

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 A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free [...]

A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool [...]

A body cools in a surrounding which is at a constant temperature of theta 0. Assume that it obeys Newton’s law of cooling. Its temperature theta is plotted against time t. Tangents A body cools in a surrounding which is at a constant temperature of theta 0. Assume that it obeys Newton's law of cooling. [...]

A hollow copper sphere S and a hollow copper cube C, both of negligibly thick walls of same area, are filled with water at 90 C and allowed to cool in the same environment. A hollow copper sphere S and a hollow copper cube C are filled with water at 90 C and allowed to [...]

For a small temperature difference between the body and the surroundings, the relation between the rate of heat loss R and the temperature of the body is depicted by For a small temperature difference between the body and the surroundings the relation between the rate of heat loss R and the temperature of the body [...]

Water and turpentine oil ( of specific heat less than that of water) are both heated to same temperature. Equal amounts of these placed in identical calorimeters are then left in air. Water and turpentine oil ( of specific heat less than that of water) are both heated to same temperature. Equal amounts of these [...]