Related InterviewSolutions

• The efficiency of a Carnot engine operating between temperatures of `100^(@)C` and `-23^(@)C` will beA. `(100 - 23)/(273)`B. `(100 + 23)/(373)`C. `(100 + 23)/(100)`D. `(100 - 23)/(100)`
• Mercury thermometers can be used to measure temperatures uptoA. `260^(@)C`B. `100^(@)C`C. `360^(@)C`D. `500^(@)C`
• A black body has maximum wavelength `lambda_(m)` at temperature `2000 K`. Its corresponding wavelength at temperature 3000 will beA. `(2)/(3) lambda`B. `(16)/(81) lambda`C. `(81)/(16) lambda`D. `(4)/(3) lambda`
• Which of the following is close to an ideal black body ?A. Black lampB. Cavity maintained at constant tempratureC. Platinum blackD. A lamp of charcoal heated to high temperature
• Condider two rods of same length and different specific heats `(s_(1), s_(2))`, thermal conductivities `(K_(1), K_(2))` and areas of cross-section `(A_(1), A_(2))` and both having temperatures `(T_(1), T_(2))` at their ends. If their rate of loss of heat due to conduction are equal, thenA. `K_(1)A_(1) = K_(2)A_(2)`B. `(K_(1)A_(1))/(s_(1)) = (K_(2)A_(2))/(s_(2))`C. `K_(2)A_(1) = K_(1)A_(2)`D. `(K_(2)A_(1))/(s_(2)) = (K_(1)A_(2))/(s_(1))`
• The efficiency of carnot engine is 50% and temperature of sink is 500K. If temperature of source is kept constant and its efficiency raised to 60%, then the required temperature of the sink will be : -A. `600 K`B. `500 K`C. `400 K`D. `100 K`
• One mole of an ideal monoatomic gas requires 207 J heat to raise the temperature by 10 K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10 K, the heat required is [Given the gas constant R = 8.3 J/ mol. K]A. 198.7 JB. 29 JC. 215.3 JD. 124 J
• During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio `C_P//C_V` for the gas isA. `4/3`B. `2`C. `5/3`D. `3/2`
• If the temperature of the sun (black body) is doubled, the rate of energy received on earth will be increase by a factor ofA. 2B. 4C. 8D. 16
• A gaseous mixture consists of 16g of helium and 16 g of oxygen. The ratio `(C_p)/(C_v)` of the mixture isA. `1.62`B. `1.59`C. `1.54`D. `1.4`