List of top Physics Questions on Thermodynamics

A source supplies heat to a system at the rate of 1000 W. If the system performs work at a rate of 200 W, what is the rate at which internal energy of the system increases?

In an isobaric process, 200 J of heat is supplied to a gas. The gas does 50 J of work. What is the change in internal energy?

A gas expands isothermally and reversibly from a volume V to 2V. If the initial pressure is P, what is the final pressure?

An ideal gas expands from 2 L to 6 L at a constant temperature of 300 K. Calculate the work done by the gas if pressure remains constant at 2 atm. (1 atm = $1.013 \times 10^5$ Pa)

The equilibrium state of a thermodynamic system is described by:
A. Pressure
B. Total heat
C. Temperature
D. Volume
E. Work done
Choose the answer from the options given below.

A mixture of one mole of monoatomic gas and one mole of diatomic gas (rigid) are kept at room temperature ($ 27^\circ \text{C} $). The ratio of specific heat of gases at constant volume respectively is:

Two vessels $ A $ and $ B $ are of the same size and are at the same temperature. Vessel $ A $ contains $ 1 \, \text{g} $ of hydrogen and vessel $ B $ contains $ 1 \, \text{g} $ of oxygen. $ P_A $ and $ P_B $ are the pressures of the gases in $ A $ and $ B $ respectively. Then $ \frac{P_A}{P_B} $ is:

A real gas within a closed chamber at $ 27^\circ \text{C} $ undergoes the cyclic process as shown in the figure. The gas obeys the equation $ PV^3 = RT $ for the path A to B. The net work done in the complete cycle is (assuming $ R = 8 \, \text{J/molK} $):