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NEET 2020 Physics: Transfer of Heat Quiz
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Question 1
Two spheres of the same material have radii 1 m and 4 m and temperatures 4000 K and 2000 K respectively. The ratio of energy radiated per second by the first sphere to that by the second is
Question 2
A black body emits heat at the rate of 20 W. When its temperature is 727 ° C. Another black body emits heat at the rate of 15W, when its temperature is 227 º C. Compare the area of the surface of the two bodies, if the surrounding is at NTP.
Question 3
A composite slab is prepared b pasting two plates of thicknesses and and thermal conductivities and . The slabs have equal cross-sectional area. Find the equivalent conductivity of the slab.
Question 4
The wavelength of maximum energy released during an atomic explosion was 2.93 × 10–10 m. Given that Wien's constant is 2.93 × 10–3 m-K, the maximum temperature stained must be of the order of
Question 5
Two rigid boxes containing different ideal gases are placed on table. Box A contains one mole of nitrogen at temperature T0, while box B contains 1 mole of helium at temperature 7/3 T0. The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes) then the final temperature of gases, Tf in terms of T0 is
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Mar 3NEET & AIIMS