MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
*/*_Work done in an adiabatic process between two states depends on the? |
| A. | Rate of heat transmission |
| B. | Initial state only |
| C. | End states only |
| D. | None of these |
| Answer» D. None of these | |
| 2. |
*/*_For a constant pressure reversible process, the enthalpy change (ΔH) of the system is? |
| A. | Cv.dT |
| B. | Cp.dT |
| C. | ‚à ´Cp.dT |
| D. | ‚à ´Cv.dT |
| Answer» D. ‚Äö√ ¬¥Cv.dT | |
| 3. |
*/*_Degree of freedom of the system ice-water-vapour will be? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 4. |
*/*_During Joule-Thomson expansion of gases? |
| A. | Enthalpy remains constant |
| B. | Entropy remains constant |
| C. | Temperature remains constant |
| D. | None of these |
| Answer» B. Entropy remains constant | |
| 5. |
*/*_The equation Tds = dE - PdV applies to? |
| A. | Single phase fluid of varying composition |
| B. | Single phase fluid of constant composition |
| C. | Open as well as closed systems |
| D. | Both B and C |
| Answer» E. | |
| 6. |
*/*_Cp of a gas at its critical temperature and pressure? |
| A. | Becomes zero |
| B. | Becomes infinity |
| C. | Equals 1 kcal/kmol °K |
| D. | Equals 0.24 kcal/kmol °K |
| Answer» C. Equals 1 kcal/kmol ¬¨‚àûK | |
| 7. |
*/*_The intensive properties are? |
| A. | Molar volume, density, viscosity and boiling point |
| B. | Refractive index and surface tension |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 8. |
*/*_The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance.? |
| A. | Simultaneous pressure & temperature change |
| B. | Heating |
| C. | Cooling |
| D. | Both B and C |
| Answer» E. | |
| 9. |
*/*_A solid is transformed into vapour without going to the liquid phase at? |
| A. | Triple point |
| B. | Boiling point |
| C. | Below triple point |
| D. | Always |
| Answer» B. Boiling point | |
| 10. |
%_For the gaseous phase chemical reaction, C‚ÇÇH‚ÇÑ(g) + H‚ÇÇO(g) ‚ü∑ C‚ÇÇH‚ÇÖOH(g), the equilibrium conversion does not depend on the_% |
| A. | Steam to ethylene ratio |
| B. | Temperature |
| C. | Pressure |
| D. | None of these |
| Answer» E. | |
| 11. |
%_Work done in an adiabatic process between two states depends on the_% |
| A. | Rate of heat transmission |
| B. | Initial state only |
| C. | End states only |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
%_For a constant pressure reversible process, the enthalpy change (ΔH) of the system is_% |
| A. | Cv.dT |
| B. | Cp.dT |
| C. | ‚à ´Cp.dT |
| D. | ‚à ´Cv.dT |
| Answer» D. ‚Äö√ ¬¥Cv.dT | |
| 13. |
%_Degree of freedom of the system ice-water-vapour will be_% |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 14. |
%_During Joule-Thomson expansion of gases_% |
| A. | Enthalpy remains constant |
| B. | Entropy remains constant |
| C. | Temperature remains constant |
| D. | None of these |
| Answer» B. Entropy remains constant | |
| 15. |
%_When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is_% |
| A. | More in vapour phase |
| B. | More in liquid phase |
| C. | Same in both the phases |
| D. | Replaced by chemical potential which is more in vapour phase |
| Answer» D. Replaced by chemical potential which is more in vapour phase | |
| 16. |
%_The value of gas constant 'R' is_% |
| A. | 1.987 cal/gm mole °K |
| B. | 1.987 BTU/lb. mole °R |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 17. |
%_When a gas in a vessel expands, its internal energy decreases. The process involved is_% |
| A. | Reversible |
| B. | Irreversible |
| C. | Isothermal |
| D. | Adiabatic |
| Answer» B. Irreversible | |
| 18. |
%_For a cyclic process, a fixed ratio between heat and work_% |
| A. | Always exists |
| B. | May exist |
| C. | Never exists |
| D. | Is difficult to predict |
| Answer» B. May exist | |
| 19. |
%_The main feature of Carnot refrigeration cycle is that, it_% |
| A. | Does not need the addition of external work for its functioning |
| B. | Transfers heat from high temperature to low temperature |
| C. | Accomplishes the reverse effect of the heat engine |
| D. | None of these |
| Answer» D. None of these | |
| 20. |
%_Melting of ice exemplifies a/an_% |
| A. | Adiabatic process |
| B. | Endothermic reaction |
| C. | Exothermic reaction |
| D. | Process involving a chemical reaction |
| Answer» C. Exothermic reaction | |
| 21. |
%_What is the degree of freedom for a system comprising liquid water equilibrium with its vapour?_% |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 22. |
%_Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole._% |
| A. | 0 |
| B. | 273 |
| C. | 25 |
| D. | None of these |
| Answer» B. 273 | |
| 23. |
%_A system is said to be at equilibrium, if the entropy of the system has reached __________ value._% |
| A. | Minimum |
| B. | Zero |
| C. | Maximum |
| D. | None of these |
| Answer» D. None of these | |
| 24. |
%_For any system, what is the minimum number of degrees of freedom?_% |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 25. |
%_For spontaneous changes in an isolated system (S = entropy)_% |
| A. | Ds = 0 |
| B. | Ds <0 |
| C. | Ds > 0 |
| D. | Ds = Constant |
| Answer» D. Ds = Constant | |
| 26. |
%_Entropy of an ideal gas depends upon its_% |
| A. | Pressure |
| B. | Temperature |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 27. |
%_In the reaction, H‚ÇÇ +I‚ÇÇ ‚áã 2HI, addition of an inert gas will_% |
| A. | Increase the partial pressure of H‚ÇÇ |
| B. | Increase the partial pressure of I‚ÇÇ |
| C. | Increase the total pressure and hence shift the equilibrium towards the right |
| D. | Not effect the equilibrium conditions |
| Answer» E. | |
| 28. |
%_A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_% |
| A. | 349 |
| B. | 651 |
| C. | 667 |
| D. | 1000 |
| Answer» B. 651 | |
| 29. |
%_The heat capacities for the ideal gas state depend upon the_% |
| A. | Pressure |
| B. | Temperature |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» C. Both A & B | |
| 30. |
%_Isobaric process means a constant process._% |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | Entropy |
| Answer» C. Volume | |
| 31. |
%_Boiling of liquid is accompanied with increase in the_% |
| A. | Vapor pressure |
| B. | Specific Gibbs free energy |
| C. | Specific entropy |
| D. | All of the above |
| Answer» B. Specific Gibbs free energy | |
| 32. |
%_As the temperature is lowered towards the absolute zero, the value of ‚à Ç(ŒîF)/‚à ÇT, then approaches_% |
| A. | Unity |
| B. | Zero |
| C. | That of the heat of reaction |
| D. | Infinity |
| Answer» C. That of the heat of reaction | |
| 33. |
%_Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is_% |
| A. | 300(32/7) |
| B. | 300(33/5) |
| C. | 300(33/7) |
| D. | 300(35/7) |
| Answer» B. 300(33/5) | |
| 34. |
%_Entropy of a substance remains constant during a/an __________ change._% |
| A. | Reversible isothermal |
| B. | Irreversible isothermal |
| C. | Reversible adiabatic |
| D. | None of these |
| Answer» D. None of these | |
| 35. |
%_Internal energy change of a system over one complete cycle in a cyclic process is_% |
| A. | Zero |
| B. | +ve |
| C. | -ve |
| D. | Dependent on the path |
| Answer» B. +ve | |
| 36. |
_ Duringthe phase transition, __________ changes.$? |
| A. | Pressure |
| B. | Volume |
| C. | Temperature |
| D. | All of the above |
| Answer» C. Temperature | |
| 37. |
_ The following heat engine produces power of 100000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is$? |
| A. | 100, 000 kW |
| B. | 160, 000 kW |
| C. | 200, 000 kW |
| D. | 320, 000 kW |
| Answer» E. | |
| 38. |
_ Which of the following exemplifies an adiabatic process?$? |
| A. | Melting of ice |
| B. | Condensation of alcohol vapor |
| C. | Sudden bursting of a cycle tube |
| D. | Evaporation of water |
| Answer» D. Evaporation of water | |
| 39. |
_ Pick out the extensive property out of the following.$? |
| A. | Surface tension |
| B. | Free energy |
| C. | Specific heat |
| D. | Refractive index |
| Answer» C. Specific heat | |
| 40. |
_ Compressibility factor of a gas is$? |
| A. | Not a function of its pressure |
| B. | Not a function of its nature |
| C. | Not a function of its temperature |
| D. | Unity, if it follows PV = nRT |
| Answer» B. Not a function of its nature | |
| 41. |
_ The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is$? |
| A. | Less pronounced |
| B. | More pronounced |
| C. | Equal |
| D. | Data insufficient, can't be predicted |
| Answer» C. Equal | |
| 42. |
_ Gibbs free energy of mixing at constant pressure and temperature is always$? |
| A. | 0 |
| B. | ‚à û |
| C. | + ve |
| D. | - ve |
| Answer» E. | |
| 43. |
_ Out of the following refrigeration cycles, which one has maximum COP?$? |
| A. | Air cycle |
| B. | Carnot cycle |
| C. | Ordinary vapor compression cycle |
| D. | Vapor compression with a reversible expansion engine |
| Answer» C. Ordinary vapor compression cycle | |
| 44. |
_ __________ increases with increase in pressure.$? |
| A. | The melting point of wax |
| B. | The boiling point of a liquid |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 45. |
_ The variation of heat of reaction with temperature at constant pressure is given by the __________ law.$? |
| A. | Kelvin's |
| B. | Antonie's |
| C. | Kirchoffs |
| D. | None of these |
| Answer» D. None of these | |
| 46. |
_ Which of the following is not correct for a reversible adiabatic process?$? |
| A. | TVγ-1 = constant |
| B. | P1-γ.TY = constant |
| C. | PVγ = constant |
| D. | None of these |
| Answer» E. | |
| 47. |
_ Cp of a gas at its critical temperature and pressure$? |
| A. | Becomes zero |
| B. | Becomes infinity |
| C. | Equals 1 kcal/kmol °K |
| D. | Equals 0.24 kcal/kmol °K |
| Answer» C. Equals 1 kcal/kmol ¬¨‚àûK | |
| 48. |
_ The equation Tds = dE - PdV applies to$? |
| A. | Single phase fluid of varying composition |
| B. | Single phase fluid of constant composition |
| C. | Open as well as closed systems |
| D. | Both B and C |
| Answer» E. | |
| 49. |
_ A solid is transformed into vapour without going to the liquid phase at$? |
| A. | Triple point |
| B. | Boiling point |
| C. | Below triple point |
| D. | Always |
| Answer» B. Boiling point | |
| 50. |
_ The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance.$? |
| A. | Simultaneous pressure & temperature change |
| B. | Heating |
| C. | Cooling |
| D. | Both B and C |
| Answer» E. | |