GUJCET Thermodynamics — practice questions
42 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice GUJCET Thermodynamics in the app →The first law of thermodynamics is mathematically expressed as:In an isothermal process for an ideal gas, which thermodynamic quantity remains constant?For an ideal gas expanding isothermally from volume $V_1$ to $V_2$ at temperature $T$, the work done by the gaFor an adiabatic process involving an ideal gas, which quantity is constant?A Carnot engine operates between a hot reservoir at $T_1 = 500$ K and a cold reservoir at $T_2 = 300$ K. The eFor an ideal gas, the relation between molar heat capacities is $C_p - C_v = R$. Why is $C_p$ always greater tWhich of the following is an example of an **isolated** thermodynamic system?The mathematical statement of the **first law of thermodynamics** is:An ideal gas in a cylinder is compressed in a **single step** from volume Vᵢ to volume Vf (Vf < Vᵢ) by a constFor the **isothermal free expansion** of an ideal gas into vacuum, which set of statements is correct?The figure shows three thermodynamic systems labelled (a), (b) and (c). System (a) is an open beaker, (b) is a2 mol of an ideal gas undergoes isothermal reversible expansion from 1 L to 10 L at 27 °C. Calculate the heat The first law of thermodynamics is essentially a statement of:Work done in an isothermal process for ideal gas:In an adiabatic process, the heat exchanged with surroundings is:The ratio Cp/Cv is denoted by:For an ideal gas, Cp − Cv equals:In an ISOCHORIC process, work done equals:For an adiabatic process on ideal gas: PV^γ = ?Internal energy change ΔU for an ideal gas depends ONLY on:In an isothermal expansion of ideal gas, the work done BY the gas is +500 J. The heat absorbed by the gas is:A monatomic ideal gas has γ = 5/3. For an adiabatic process, P₁V₁^γ = P₂V₂^γ. If V₂ = 8V₁, find P₂/P₁:1 mole of ideal gas (Cv = 3R/2) is heated at constant volume from 300 K to 600 K. Heat absorbed:For a monatomic ideal gas in isobaric expansion from V₁ to 3V₁, find ΔT/T₁:In a cyclic process, ΔU equals:The slope of an isothermal curve in PV diagram (dP/dV)_T equals:The slope of an adiabatic curve in PV diagram (dP/dV)_adiabatic equals:For a Carnot engine operating between T_h = 600 K and T_c = 300 K, efficiency is:A gas absorbs 500 J of heat and does 200 J of work. Change in internal energy:For a diatomic ideal gas (γ = 7/5), molar Cv equals:Isothermal bulk modulus of an ideal gas equals:Adiabatic bulk modulus of ideal gas equals:In a free expansion of ideal gas (into vacuum), the temperature:An ideal gas undergoes isobaric expansion. Q = 100 J, W = 40 J. Find ΔU:For an adiabatic process of an ideal gas, TV^(γ-1) = constant. If T₁ = 300 K and V₂ = 2V₁ for γ = 5/3, then T₂In a Carnot cycle, heat absorbed at hot reservoir is 1000 J. Efficiency 25%. Heat rejected at cold reservoir:For polytropic process PV^n = constant, n = 0 means:Two identical containers contain ideal gas at temperatures T₁ and T₂. The walls suddenly become porous, gases In which process is heat capacity infinite for ideal gas?A heat engine operates with 20% efficiency between two reservoirs. If T_h = 500 K, find T_c (for maximum/CarnoAn ideal gas undergoes isothermal expansion at 300 K from V = 1 to V = 2. Heat absorbed (n = 1):A diatomic ideal gas at 27°C is compressed adiabatically to ½ its volume. Find final temperature (γ = 7/5):