JEE Physics - MCQ Practice Questions

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)

For a reversible isothermal process of an ideal gas, the entropy change of the universe is:

A gas undergoes a process where PV² = constant. If the gas expands from volume V to 2V, what is the ratio of final to initial pressure?

A thermally insulated container holds 2 moles of oxygen gas at 300 K. A heating element supplies 5000 J of heat to the gas. What is the final temperature? (C_v for O₂ = 5R/2, R = 8.314 J/mol·K)

For a Carnot refrigerator operating between 250 K (cold reservoir) and 300 K (hot reservoir), the coefficient of performance (COP) is:

A substance has a latent heat of vaporization of 2260 kJ/kg at 373 K. The entropy change during vaporization of 1 kg of water is approximately:

When a system undergoes a process where both Q and W are positive, which statement is true?

A system undergoes a cyclic process. The internal energy change over one complete cycle is ΔU. Which statement is correct?

Two identical blocks at different temperatures are brought into thermal contact in an isolated system. Block A at 400 K and Block B at 300 K both have mass 1 kg and specific heat 400 J/kg·K. What is the change in entropy of the universe?

An ideal gas undergoes an adiabatic process from state (P₁, V₁, T₁) to (P₂, V₂, T₂) with γ = 1.4. If volume increases by 50%, the temperature ratio T₂/T₁ is approximately:

A refrigerator operates with a COP (Coefficient of Performance) of 4 between temperatures 250 K and 350 K. What is the theoretical maximum COP possible?