JEE Physics - MCQ Practice Questions

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:

Three moles of ideal gas undergo polytropic process with n = 1.5. If temperature increases from 300 K to 450 K, the work done by gas is:

A heat engine operates between 600 K and 300 K reservoirs. It absorbs 5000 J from hot reservoir. For a Carnot engine operating between same temperatures, maximum work output would be:

For a van der Waals gas, the critical point is characterized by:

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

A reversible process has entropy change ΔS_sys = -100 J/K. The entropy change of universe is:

A system absorbs 4000 J of heat and does 1500 J of work. Change in internal energy is:

In a free expansion of ideal gas into vacuum, the entropy change of system is:

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?

A monatomic ideal gas undergoes a cyclic process ABCA where: A→B is isothermal expansion, B→C is isochoric process, C→A is adiabatic compression. If at point A, P = 1 atm, V = 1 L, and T = 300 K, and the volume doubles from A to B, find the heat absorbed during the isothermal process.

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 gas expands adiabatically from state (P₁, V₁, T₁) to state (P₂, V₂, T₂). Which relation is correct for this process?

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?

The internal energy of an ideal gas depends only on:

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)