NEET Physics - MCQ Practice Questions

For a monatomic ideal gas, the ratio Cp/Cv is:

When a substance changes phase from solid to liquid at its melting point at constant temperature and pressure, which is true?

A diatomic gas undergoes free expansion into a vacuum. The entropy of the universe:

For a reaction where ΔH = -200 kJ/mol and ΔS = 50 J/mol·K at 300 K, calculate ΔG:

In a throttling process (Joule-Thomson expansion), which quantity remains constant?

The standard molar entropy of a substance at 0 K according to the third law of thermodynamics is:

A composite Carnot engine and refrigerator system operates between three reservoirs. If the engine operates between 500 K and 300 K, and the refrigerator between 300 K and 200 K, what is the theoretical relationship for reversible operation?

A gas expands isothermally from volume V₁ to V₂. The work done by the gas is W and heat absorbed is Q. What is the relationship between W and Q for an ideal gas?

A reversible heat engine operates between two reservoirs at temperatures T₁ = 400 K and T₂ = 300 K. What is the maximum possible efficiency of this engine?

For a triatomic linear gas molecule, what is the value of Cp - Cv?

A 2 kg block of ice at 0°C is heated until it completely melts. The latent heat of fusion of ice is 3.36 × 10⁵ J/kg. What is the heat required?

Two identical gases at the same temperature and pressure occupy different volumes. Which thermodynamic property must be the same for both?

A gas undergoes an adiabatic compression where work done on the gas is 500 J. What is the change in internal energy?

For an ideal gas undergoing a polytropic process PVⁿ = constant, if n = γ = 1.4, what type of process is this?

A substance has ΔH = -150 kJ/mol and ΔS = -100 J/(mol·K). At what temperature will ΔG = 0?

An ideal gas at pressure P₁ and volume V₁ undergoes heating at constant volume until pressure becomes P₂. If P₂/P₁ = 2, what is the ratio of final to initial temperature?

Three moles of an ideal diatomic gas are heated from 300 K to 600 K at constant pressure. What is the heat absorbed? (R = 8.314 J/(mol·K))

When 1000 J of heat is supplied to a system and it does 400 J of work, what is the change in internal energy?

A heat engine with 30% efficiency absorbs 5000 J from a hot reservoir. How much heat is rejected to the cold reservoir?

For a spontaneous reaction at 25°C, which condition must be satisfied?