JEE Physics - MCQ Practice Questions

A gas expands from 1 L to 5 L against a constant external pressure of 2 atm. The work done by the gas is approximately:

The molar heat capacity of a diatomic ideal gas at constant pressure is (R = 8.314 J/mol·K):

A cyclic process ABCA is shown on a P-V diagram where AB is isothermal expansion, BC is adiabatic compression, and CA is isochoric process. Which statement is correct?

A heat engine absorbs 1000 J from a hot reservoir and rejects 600 J to a cold reservoir in one cycle. Its efficiency is:

Three moles of ideal gas at 300 K are compressed isothermally from 10 L to 2 L. The work done on the gas is (R = 8.314 J/mol·K, ln(5) = 1.609):

A reversible heat engine operates between two thermal reservoirs. If the temperature of the cold reservoir decreases while hot reservoir temperature remains constant, the maximum efficiency:

Which process results in zero change of entropy for an ideal gas?

In a throttling process (Joule-Thomson expansion), which of the following remains constant?

Five moles of an ideal monatomic gas are heated at constant volume from 300 K to 600 K. The change in internal energy is:

Two kilograms of water at 100°C is converted to steam at 100°C at 1 atm pressure. The change in entropy is (Latent heat of vaporization = 2.26 × 10⁶ J/kg):

In a cyclic process, the system returns to its initial state. Which statement is always true?

A gas expands against constant external pressure of 1 atm from 2 L to 5 L. Work done by the gas is:

Six moles of ideal diatomic gas undergo an isobaric expansion from 10 L to 20 L at 2 atm. Temperature change is:

A real gas deviates from ideal behavior. Which condition favors ideal behavior?

An open system differs from a closed system in that:

The heat capacity at constant pressure Cp is greater than heat capacity at constant volume Cv for ideal gases because:

Two identical containers of ideal gas are connected by a tube with a valve. Initially, container A has pressure 2P and volume V at temperature T, while container B has pressure P and volume V at the same temperature. When the valve is opened and the system reaches equilibrium, what is the final pressure?

For a Carnot heat engine operating between reservoirs at temperatures T_h = 500 K and T_c = 300 K, if the engine absorbs 5000 J per cycle from the hot reservoir, how much work is done per cycle?

A diatomic ideal gas is compressed isothermally at 400 K from 10 L to 5 L. The work done on the gas is 2300 J. What is the number of moles of the gas?

Four moles of a diatomic ideal gas are heated from 300 K to 400 K at constant volume. Find the increase in internal energy. (R = 8.314 J/mol·K)