MEDIUM
Physics
IMPORTANT
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For a small temperature difference between the body and the surroundings, the relation between the rate of heat loss and the temperature of the body is depicted by
(a)
(b)
(c)
(d)

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Important Questions on Transmission of Heat
MEDIUM
Physics
IMPORTANT
A hollow copper sphere and a hollow copper cube , both of negligibly thick walls of same area, are filled with water at and allowed to cool in the same environment. The graph that correctly represents their cooling is

EASY
Physics
IMPORTANT
A body cools in a surrounding which is at a constant temperature of . Assume that it obeys Newton's law of cooling. Its temperature is plotted against time . Tangents are drawn to the curve at the points and . These tangents meet the time axis at angles of and , as shown.

MEDIUM
Physics
IMPORTANT
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 each sphere and its surroundings is . Then,

MEDIUM
Physics
IMPORTANT
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?

EASY
Physics
IMPORTANT
Heat is flowing through a conductor of length from to , If its thermal resistance per unit length is uniform, which of the following graphs is correct?

MEDIUM
Physics
IMPORTANT
Two rectangular blocks and 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 at one end of is and that of at the other end is . If the ratio of their thermal conductivities is , then under steady state, the temperature of the junction in contact will be

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

EASY
Physics
IMPORTANT
The coefficients of thermal conductivity of copper, mercury and glass are respectively and such that . If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are and , then
