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 R and the temperature of the body is depicted by

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Important Questions on Transmission of Heat

MEDIUM
Physics
IMPORTANT
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. The graph that correctly represents their cooling is
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Physics
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A body cools in a surrounding which is at a constant temperature of θ0. Assume that it obeys Newton's law of cooling. Its temperature θ is plotted against time t. Tangents are drawn to the curve at the points Pθ=θ2 and Qθ=θ1. These tangents meet the time axis at angles of ϕ2 and ϕ1, as shown.

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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 T. 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 l from x=0 to x=l, If its thermal resistance per unit length is uniform, which of the following graphs is correct?
MEDIUM
Physics
IMPORTANT
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 at one end of A is 100°C and that of B at the other end is 0°C. If the ratio of their thermal conductivities is 1:3, 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 12 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 Kc, Km and Kg such that Kc>Km>Kg. If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are Xc, Xm and Xg, then