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 ____.
The quantity of heat which crosses unit area of a metal plate during conduction depends upon ____.
the density of the metal
the temperature gradient perpendicular to the area
the temperature to which the metal is heated
the area of the metal plate
In order that the heat flows from one part of a solid to another part, what is required?
Uniform density
Density gradient
Temperature gradient
Uniform temperature
At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are ____.
equal to temperature of the body
less than the temperature of the body
greater than temperature of the body
Either B or C
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/
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The lengths and radii of two rods made of same material are in the ratios
1: 2 and 2: 3 respectively. If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them is in the ratio ____.
1: 3
4 : 3
8 : 9
3 : 2
There are two identical vessels filled with equal amounts of ice. The vessels are of different metals. If the ice melts in the two vessels in 20 and 35 minutes respectively, the ratio of the coefficients of thermal conductivity of the two metals is ____.
4 : 7
7 : 4
16 :49
49 : 16
Surface of the lake is at 2°C. Find the temperature of the bottom of the lake ____.