A mono atomic ideal gas, initially at temperature T₁ is enclosed in a cylinder fitted with a friction-less piston. The gas is allowed to expand adiabatically to a temperature T₂ by releasing the piston suddenly. L₁ and L₂ are the lengths of the gas column before and after expansion respectively, then T₁/T₂ is given by

A scientist says that the efficiency of his heat engine which works at source temperature of 127^oC and sink temperature 27^oC is 26%.

A gas at state A changes to state B through path I and II shown in figure. The changes in internal energy are ΔU₁ and ΔU₂ respectively. Then

A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is 

                  

Which of the following is not a  thermodynamic coordinate?

A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increased from V to 32 V, the efficiency of the engine is

Which of the following is incorrect regarding the first law of thermodynamics ?

A Carnot engine, having an efficiency of 1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

An ideal mono atomic gas is taken around the cycle ABCDA as shown in the PV diagram. The work done during the cycle is given by

               

A system goes from A to B via two processes I and II as shown in the figure. If ΔU₁ and ΔU₂are the changes in internal energies in the processes I and II respectively, then