Calculate the work done if temperature is changed from 0^oC to 200^oC at one atmosphere:(R = 2 calK^-1).

100 g of water is heated from 30^oC to 50^oC. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)

If c_p and c_v denote the specific heat of nitrogen per unit mass at constant pressure and constant volume respectively, then:

A thermodynamic process is shown in the figure. The pressure and volumes corresponding to some points in the figure are:

P_A = 3 × 10⁴ Pa,  V_A = 2 × 10^-3 m³

P_B = 8 × 10⁴ Pa, V_B = 5 × 10^-3 m³

In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be

Let 110 J of heat is added to a gaseous system, whose internal energy is 40 J, then the amount of external work done is:

An ideal monoatomic gas is taken round the cycle ABCDA as shown in the P-V diagram.

              

When a system is taken from the initial state i to final state f along he path iaf, it is found that Q = 50 cal and W = 20 cal. If along the path ibf, Q = 36 cal, then W along the path ibf is:

                      

A Carnot engine, having an efficiency of 1/10 as a 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:

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%:

The internal energy change, when a system goes from state A and B is 40 kJ mole^-1. If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy ?