Thermodynamics – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. The first law of thermodynamics is the law of conservation of: (A) Mass (B) Energy (C) Momentum (D) Entropy 2. The zeroth law of thermodynamics deals with: (A) Pressure (B) Temperature equilibrium (C) Entropy (D) Work 3. A system which can exchange energy but not matter with its surroundings is called: (A) Open system (B) Closed system (C) Isolated system (D) Steady system 4. A system which can exchange both mass and energy with its surroundings is: (A) Open system (B) Closed system (C) Isolated system (D) Adiabatic system 5. Which of the following is an intensive property? (A) Mass (B) Volume (C) Pressure (D) Energy 6. Which of the following is an extensive property? (A) Temperature (B) Pressure (C) Mass (D) Density 7. Specific heat at constant pressure is denoted by: (A) Cp (B) Cv (C) h (D) R 8. Specific heat at constant volume is denoted by: (A) Cp (B) Cv (C) h (D) R 9. For an ideal gas, the relation between Cp and Cv is: (A) Cp = Cv – R (B) Cp = Cv + R (C) Cp = R – Cv (D) Cp = R × Cv 10. The ratio of Cp to Cv is called: (A) Entropy (B) Adiabatic index (γ) (C) Compressibility (D) Heat ratio 11. The unit of entropy in SI is: (A) J/kg (B) J/kg·K (C) N·m (D) W 12. Entropy is a measure of: (A) Heat transfer (B) Disorder or randomness (C) Work done (D) Pressure 13. The second law of thermodynamics introduces the concept of: (A) Energy conservation (B) Entropy (C) Internal energy (D) Enthalpy 14. The Kelvin–Planck statement of second law deals with: (A) Heat engines (B) Refrigerators (C) Entropy (D) Work transfer 15. The Clausius statement of second law deals with: (A) Heat engines (B) Refrigerators (C) Entropy (D) Internal energy 16. A process which occurs at constant pressure is called: (A) Isochoric (B) Isobaric (C) Isothermal (D) Adiabatic 17. A process which occurs at constant volume is: (A) Isochoric (B) Isobaric (C) Isothermal (D) Adiabatic 18. A process which occurs at constant temperature is: (A) Isobaric (B) Isochoric (C) Isothermal (D) Adiabatic 19. A process in which no heat is exchanged is: (A) Isothermal (B) Isobaric (C) Isochoric (D) Adiabatic 20. Work done in an isothermal process is given by: (A) W = P·V (B) W = nRT ln(V₂/V₁) (C) W = mgh (D) W = CpΔT 21. In an adiabatic process, the relation between P and V is: (A) PV = constant (B) PVγ = constant (C) P/T = constant (D) V/T = constant 22. The efficiency of a Carnot engine depends on: (A) Type of working fluid (B) Temperatures of reservoirs (C) Pressure difference (D) Volume change 23. The maximum possible efficiency of a heat engine is given by: (A) 1 – T₂/T₁ (B) T₂/T₁ (C) (T₁ – T₂)/P (D) P·V/T 24. The performance of a refrigerator is expressed as: (A) Efficiency (B) COP (Coefficient of Performance) (C) Entropy (D) Work ratio 25. The COP of a refrigerator is always: (A) Less than 1 (B) Greater than 1 (C) Equal to 1 (D) Zero 26. The performance of a heat pump is measured by: (A) Efficiency (B) COP (C) Entropy change (D) Heat ratio 27. The enthalpy of a system is defined as: (A) U + PV (B) U – PV (C) U + TS (D) U – TS 28. Internal energy is a function of: (A) Volume only (B) Pressure only (C) Temperature only (D) Work only 29. The unit of heat transfer is: (A) Joule (B) Watt (C) Pascal (D) Kelvin 30. The specific heat of an ideal gas is: (A) Constant (B) Variable (C) Always zero (D) Infinite 31. A reversible process is one that: (A) Cannot be reversed (B) Can be reversed without leaving changes in system or surroundings (C) Always increases entropy (D) Has zero work 32. The entropy of an isolated system always: (A) Increases (B) Decreases (C) Remains constant (D) Becomes zero 33. In throttling process, enthalpy: (A) Increases (B) Decreases (C) Remains constant (D) Doubles 34. The device which converts heat energy into work is called: (A) Heat engine (B) Refrigerator (C) Compressor (D) Turbine 35. The device which transfers heat from low temperature to high temperature region is: (A) Heat engine (B) Refrigerator (C) Turbine (D) Boiler 36. The Carnot cycle consists of: (A) 2 isothermal and 2 adiabatic processes (B) 2 isobaric and 2 isochoric processes (C) 4 adiabatic processes (D) 4 isothermal processes 37. The Otto cycle is used in: (A) Diesel engines (B) Petrol engines (C) Gas turbines (D) Steam engines 38. The Diesel cycle is used in: (A) Petrol engines (B) Gas turbines (C) Diesel engines (D) Steam engines 39. The Brayton cycle is used in: (A) Petrol engines (B) Gas turbines (C) Diesel engines (D) Refrigerators 40. The Rankine cycle is used in: (A) Steam power plants (B) Gas turbines (C) Refrigerators (D) Diesel engines 41. A Mollier diagram is a plot of: (A) Enthalpy vs. Entropy (B) Pressure vs. Volume (C) Temperature vs. Entropy (D) Pressure vs. Enthalpy 42. Kelvin scale of temperature starts from: (A) –273°C (B) 0°C (C) 100°C (D) 273°C 43. The SI unit of work is: (A) Watt (B) Joule (C) Pascal (D) Newton 44. The Clausius inequality is related to: (A) Work (B) Entropy (C) Internal energy (D) Pressure 45. In an ideal gas, internal energy depends on: (A) Volume only (B) Pressure only (C) Temperature only (D) Heat only 46. The gas constant R is equal to: (A) Cp – Cv (B) Cp + Cv (C) Cp/Cv (D) Cv – Cp 47. The entropy change for a reversible adiabatic process is: (A) Zero (B) Positive (C) Negative (D) Infinite 48. In an irreversible process, entropy: (A) Remains constant (B) Decreases (C) Increases (D) Zero 49. A heat engine working between two reservoirs cannot be more efficient than: (A) Carnot engine (B) Diesel engine (C) Otto engine (D) Rankine cycle 50. 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