If R is universal gas constant, the amount of heat needed to raise the temperature of 2 moles of an ideal mono-atomic gas from 273 K to 373 K when no work is done is:


Correct option is

300 R


As no work is done, hence





A gas has:


Mean kinetic energy per gram molecule for diatomic gas is:


Molar specific heat at constant volume Cv for a mono-atomic gas is:


>Cvas in the case of Cp:


The following sets of values for Cv and Cp of a gas have been reported by different students. The units are cal/gm-mole-K. Which of these sets is most reliable?


A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62oC, the efficiency of the engine is doubled. The temperatures of the source and sink are:


We consider a thermodynamic system. If  represents the increase in its internal energy and the work done by the system, which of the following statements is true?


If the ratio of specific heats of a gas at constant pressure to that at constant volume is , the change in internal energy of the given mass of gas, when the volume changes from to 2V at constant pressure P is:


A Carnot engine uses first an ideal mono-atomic gas () and then an ideal diatomic gas () as its working substance. The source and sink temperatures are 411oC and 69oC respectively and the engine extracts 1000 J of heat from the source in each cycle. Then:


The temperatures of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surroundings will be nearly: