JEE Physics - MCQ Practice Questions

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?

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

Two moles of an ideal diatomic gas undergo a process where temperature changes from 400 K to 800 K. If the process is such that PV^(1.4) = constant, then the work done by the gas is approximately (R = 8.314 J/mol·K):

A system undergoes a process where both pressure and volume increase. Which thermodynamic quantity must increase?

Four moles of an ideal gas are heated from 250 K to 350 K at constant volume. Simultaneously, it is allowed to expand at constant temperature. Which process involves greater entropy change?

A heat pump delivers 5000 J of heat to a house while consuming 1500 J of work. Its coefficient of performance is:

A diatomic ideal gas expands isothermally from volume V₁ to 2V₁. If the initial pressure is P₀, what is the work done by the gas?

An ideal gas undergoes adiabatic compression from state (P₁, V₁, T₁) to (P₂, V₂, T₂). Which relation is correct?

The internal energy of an ideal gas depends on:

A Carnot engine operates between 400 K and 300 K. Its maximum efficiency is:

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