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Free Online Mock Physics Multiple Choice Test on Heat Transmission
Sub Category : Heat Transmission Test : 8 Time Left :
1) A cup of tea cools from 65.5degreeC to 62.5degreeC in one min in a room of 22.5degreeC. How long will the same cup of tea take, in min, to cool from 46.5degreeC to 40.5degreeC in the same room. (Choose nearest value) (1) 1 (2) 2 (3) 3 (4) 4 (5) 5
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2) If lamda m denotes the wavelength at which the radiative emission from a black body at a temperature T K is maximum, then(1) lamda m proportionalto T4 (2) lamda m is independent of T (3) lamda m proportional to T (4) lamda m proportional to T-1.
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3)If the temperature of the sun were to icnrease from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be
(1) 4 (2) 16 (3) 32 (4) 64
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4) Two thermally insulated vessels 1 and 2 are filled with air at temperatures (T1, T2), volumes (V1, V2) and pressure (P1, P2) respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be(1) (T1 + T2) (2) (T1 + T2)/2 (3) T1T2(P1V1+P2V2)/P1V1T2+P2V2T1 (4) T1T2(P1V1+P2V2)/P1V1T1+P2V2T2
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5) Which of the following rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?(1) r = r0, l = l0 (2) r = 2r0, l = l0 (3) r = r0, l = 2l0 (4) r = 2r0, l = 2l0.
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