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Two rods ofsamelengthandareaofcross-sectionA1and A2havetheirendsatthesametemperature.If K1and K2 are their thermal conductivities,c1 and c2 are their specific heatsandd1andd2aretheirdensities,thentherateofflow of heat is the same in both the rods if
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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A long metallicbar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature 0 along the length x of the bar from its hot end is best described by which of the following figures?
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Two rods of same length and transfer a given amount of heat12second,whentheyarejoined as shown in figure (i).But when they are joined as shown in figure (ii), then they will transfer same heat in same
conditions in
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Two rods, one of aluminum and the other made of steel having initial length 
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When the temperature of a rod increases from t to
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A rectangular block is heated from 0cto100C. Thepercentageincreaseinitslengthis0.10%.Whatwillbethepercentage increase in its volume?
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The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2. Calculate the power itradiatesat2000K.(cr=5.67
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if light with wavelength 0.50 
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100 cm3 of water is compressed from 0.5 atmosphere pressure The work done is x. The work done in compressing 100 cm3 of air from 0.5 atmosphere to 5 atmosphere is y. Then:
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