Thermodynamics ...

In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas if the initial internal energy of the gas was 30 J. The final internal energy wilI be:

Internal energy of a gas increases when 

Zeroth law of thermodynamic signifies:

If heat is supplied to the system it :

Hydrogen and helium each having volume $$V$$ at same temperature $$T$$ and same pressure $$P$$ are mixed to have same volume $$V$$. The resulting pressure of the mixture will be:

Two gases of equal masses are in thermal equilibrium. If $$P_a,  P_b$$ and $$V_a, V_b$$ are their respective pressures and volumes, then which relation. is true?

According to Boyle's law, PV = constant, at constant temperature. Which of the following graphs is correct?

At constant temperature for an ideal gas of a fixed mass, the variation of the product $$PV$$ with volume $$V$$ is graphically represented by the curve

Two bodies A and B are said to be in thermal equilibrium with each other, if

Figure shows pressure P-Y graph for a certain mass of a gas at two constant temperatures $$T_1$$ and $$T_2$$. Which of the inferences given below is correct?