Physics-
General
Easy
Question
If
are efficient of linear, area and volume expansion respectively, then
The correct answer is:
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Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minute and for smaller one is 16 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is
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Two rods, one of aluminum and the other made of steel having initial length 
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The spectrum of a black body at two temperatures 27oC and 327oC is shown in the figure. Let A1 and A2 be the areas under the two curves respectively. The value of 
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