JEE Physics - MCQ Practice Questions

For a diatomic ideal gas undergoing an isothermal process, which quantity remains constant?

Two samples of the same ideal gas at the same temperature have volumes V and 2V respectively. The ratio of their internal energies is:

A heat engine absorbs 1000 J of heat and rejects 600 J to the cold reservoir in one cycle. What is its efficiency?

The entropy change for a reversible isothermal process is given by:

Which process would result in the maximum work output from an ideal gas expansion between two fixed pressures?

A cylinder with a movable piston contains 2 moles of ideal gas at 300 K and 1 atm. When heated at constant pressure to 600 K, what is the work done by the gas? (R = 8.314 J/mol·K)

The molar heat capacity at constant pressure for a diatomic ideal gas is:

A refrigerator operates on a Carnot cycle between -10°C and 30°C. The coefficient of performance (COP) is approximately:

One mole of an ideal monoatomic gas is heated at constant volume from 300 K to 600 K. The change in internal energy is (R = 8.314 J/mol·K):

Two identical blocks of metal at different temperatures are brought into thermal contact in an isolated system. The process is:

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):