NEET Physics - MCQ Practice Questions

The molar heat capacity of a gas at constant pressure (Cp) is greater than at constant volume (Cv) because:

A carnot engine operates between two reservoirs at temperatures 400 K and 300 K. What is its maximum efficiency?

Which statement about entropy is correct for an isolated system?

In an isothermal process of an ideal gas, the work done by the gas is:

A gas undergoes compression where both pressure and temperature increase. This process is most likely:

The coefficient of performance (COP) of a refrigerator is 5. If 100 J of work is done on it, how much heat is removed from the cold reservoir?

For a reversible adiabatic process of an ideal diatomic gas (γ = 1.4), if pressure increases from 1 atm to 10 atm, the temperature ratio T_f/T_i is:

The Gibbs free energy change (ΔG) at equilibrium is:

A heat engine has an efficiency of 40%. If it absorbs 1000 J from the hot reservoir, how much heat is rejected to the cold reservoir?

In a cyclic process, the change in internal energy is:

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?