NEET Physics - MCQ Practice Questions

Two identical gases at different temperatures are mixed adiabatically. The total entropy of the system:

A substance undergoes a phase transition from solid to liquid at constant temperature and pressure. During this process:

In a throttling process (Joule-Thomson expansion), a real gas undergoes isenthalpic expansion. The temperature change depends on:

In a Diesel engine, air is compressed adiabatically. If initial temperature is 300 K and compression ratio is 16, the final temperature is approximately (γ=1.4):

A substance has Cp = 30 J/(mol·K) and is heated at constant pressure. The ratio Cp/Cv for this substance is 1.67. What is Cv?

Two identical containers of gas at pressures P₁ and P₂ (P₁ > P₂) and same temperature are connected. After equilibrium, entropy change is:

A real gas shows negative Joule-Thomson coefficient. This means:

For a gas obeying van der Waals equation, internal energy depends on:

A refrigerator operates between 300 K and 250 K. What is the minimum work required to remove 1000 J of heat from the cold reservoir in one cycle?

In a polytropic process PVⁿ = constant. If n = γ, the process is:

Which of the following processes would have the maximum work done by the gas for the same initial and final states?

The standard enthalpy change of reaction ΔH° = -200 kJ/mol. This reaction is:

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:

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

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?

For a substance, ΔH = 100 kJ/mol (endothermic) and ΔS = 200 J/(mol·K) (entropy increase). At low temperatures, is the reaction spontaneous?

A monatomic ideal gas undergoes an isochoric process where its pressure increases from 1 atm to 3 atm. If initial temperature is 300 K, what is the heat absorbed per mole? (R = 8.314 J/(mol·K))

Two reservoirs are at temperatures 400 K and 300 K. A reversible Carnot engine operates between them. If work output is 100 J per cycle, what is the heat input from the hot reservoir?

Five moles of an ideal monatomic gas undergo isothermal expansion at 500 K from 10 L to 50 L. Calculate the change in internal energy and entropy change. (R = 8.314 J/mol·K)