MCQOPTIONS
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MCQOPTIONS
This section includes 456 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
For an isothermal reversible compression of an ideal gas_______________? |
| A. | Only ΔE = 0 |
| B. | Only ΔH =0 |
| C. | ΔE = ΔH = 0 |
| D. | dQ = dE |
| Answer» D. dQ = dE | |
| 302. |
For an irreversible process involving only pressure-volume work____________________? |
| A. | (dF)T, p <0 |
| B. | (dF)T, p = 0 |
| C. | (dF)T, p > 0 |
| D. | (dA)T, v >0 |
| Answer» B. (dF)T, p = 0 | |
| 303. |
For an isothermal process, the internal energy of a gas____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Data insufficient, can’t be predicted |
| Answer» D. Data insufficient, can’t be predicted | |
| 304. |
For an incompressible fluid, the _______________ is a function of both pressure as well as temperature? |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Entropy |
| D. | All (A), B. & (C) |
| Answer» C. Entropy | |
| 305. |
For an ideal solution, the value of activity co-efficient is______________________? |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» C. < 1 | |
| 306. |
For an ideal gas, the enthalpy__________________? |
| A. | Increases with rise in pressure |
| B. | Decreases with rise in pressure |
| C. | Is independent of pressure |
| D. | Is a path function |
| Answer» D. Is a path function | |
| 307. |
For an ideal gas, the internal energy depends upon its ____________ only? |
| A. | Molecular size |
| B. | Temperature |
| C. | Volume |
| D. | Pressure |
| Answer» C. Volume | |
| 308. |
For an ideal gas, the chemical potential is given by______________? |
| A. | RT d ln P |
| B. | R d ln P |
| C. | R d ln f |
| D. | None of these |
| Answer» B. R d ln P | |
| 309. |
For an ideal gas, the activity co-efficient is_________________? |
| A. | Directly proportional to pressure |
| B. | Inversely proportional to pressure |
| C. | Unity at all pressures |
| D. | None of these |
| Answer» D. None of these | |
| 310. |
For an exothermic reaction ____________________? |
| A. | Only enthalpy change (ΔH) is negative |
| B. | Only internal energy change (ΔE) is negative |
| C. | Both ΔH and ΔE are negative |
| D. | Enthalpy change is zero |
| Answer» D. Enthalpy change is zero | |
| 311. |
For a thermodynamic system containing ‘x’ chemical species, the maximum number of phases that can co-exist at equilibrium is_________________? |
| A. | x |
| B. | x + 1 |
| C. | x + 2 |
| D. | x + 3 |
| Answer» D. x + 3 | |
| 312. |
For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system _____________ as its mole fraction increases? |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | Decreases linearly |
| Answer» C. Remain same | |
| 313. |
For a spontaneous process, free energy__________________? |
| A. | Is zero |
| B. | Increases |
| C. | Decreases whereas the entropy increases |
| D. | And entropy both decrease |
| Answer» D. And entropy both decrease | |
| 314. |
For a single component two phase mixture, the number of independent variable properties are_________________? |
| A. | Two |
| B. | One |
| C. | Zero |
| D. | Three |
| Answer» C. Zero | |
| 315. |
For a reversible process involving only pressure-volume work____________________? |
| A. | (dF)T, p 0 |
| B. | (dF)T, p = 0 |
| C. | (dA)T, v < 0 |
| D. | None of these |
| Answer» C. (dA)T, v < 0 | |
| 316. |
For a real gas, the chemical potential is given by_____________________? |
| A. | RT d ln P |
| B. | RT d ln f |
| C. | R d ln f |
| D. | None of these |
| Answer» C. R d ln f | |
| 317. |
For a multi-component system, the term chemical potential is equivalent to the ___________________? |
| A. | Molal concentration difference |
| B. | Molar free energy |
| C. | Partial molar free energy |
| D. | Molar free energy change |
| Answer» D. Molar free energy change | |
| 318. |
For a given substance at a specified temperature, activity is ______________ to fugacity? |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Equal |
| D. | None of these |
| Answer» B. Inversely proportional | |
| 319. |
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 | |
| 320. |
For a constant volume process_________________? |
| A. | dE = CpdT |
| B. | dE = CvdT |
| C. | dQ = dE + pdV |
| D. | dW = pdV |
| Answer» C. dQ = dE + pdV | |
| 321. |
For a constant volume process _____________ by the system is used only to increase the internal energy? |
| A. | Heat absorbed |
| B. | Work done |
| C. | Both A. & B |
| D. | Neither A. nor B |
| Answer» B. Work done | |
| 322. |
For a constant pressure reversible process, the enthalpy change (ΔH) of the system is___________________? |
| A. | Cv.dT |
| B. | Cp.dT |
| C. | ∫ Cp.dT |
| D. | ∫ Cv.dT |
| Answer» D. ∫ Cv.dT | |
| 323. |
First law of thermodynamics deals with the ___________________? |
| A. | Direction of energy transfer |
| B. | Reversible processes only |
| C. | Irreversible processes only |
| D. | None of these |
| Answer» B. Reversible processes only | |
| 324. |
Filling of gas from a high pressure cylinder into small bottles is an example of a/an ______________ process? |
| A. | Equilibrium |
| B. | Adiabatic |
| C. | Steady |
| D. | Unsteady |
| Answer» E. | |
| 325. |
Extensive properties of a thermodynamic system depend upon the _____________ of the system? |
| A. | Specific volume |
| B. | Temperature |
| C. | Mass |
| D. | Pressure |
| Answer» D. Pressure | |
| 326. |
____________ explains the equilibrium constant for any chemical reaction? |
| A. | Henry’s law |
| B. | Law of mass action |
| C. | Hess’s law |
| D. | None of these |
| Answer» C. Hess’s law | |
| 327. |
(∂E/∂T)V is the mathematical expression for____________________? |
| A. | CV |
| B. | Enthalpy change |
| C. | Free energy change |
| D. | None of these |
| Answer» E. | |
| 328. |
Equilibrium constant of a reaction varies with the____________________? |
| A. | Initial concentration of the reactant |
| B. | Pressure |
| C. | Temperature |
| D. | None of these |
| Answer» D. None of these | |
| 329. |
Equilibrium constant decreases as the temperature___________________? |
| A. | Increases, for an exothermic reaction |
| B. | Decreases, for an exothermic reaction |
| C. | Increases, for an endothermic reaction |
| D. | None of these |
| Answer» B. Decreases, for an exothermic reaction | |
| 330. |
Equation which relates pressure, volume and temperature of a gas is called the__________________? |
| A. | Equation of state |
| B. | Gibbs Duhem equation |
| C. | Ideal gas equation |
| D. | None of these |
| Answer» B. Gibbs Duhem equation | |
| 331. |
______________ Equation predicts the activity co-efficient from experimental data ? |
| A. | Lewis-Randall |
| B. | Margules |
| C. | Van Laar |
| D. | Both B. & C. |
| Answer» E. | |
| 332. |
Entropy, which is a measure of the disorder of a system, is__________________? |
| A. | Independent of pressure |
| B. | Independent of temperature |
| C. | Zero at absolute zero temperature for a perfect crystalline substance |
| D. | All A, B. & C |
| Answer» D. All A, B. & C | |
| 333. |
Entropy of the system decreases, when_______________? |
| A. | Snow melts into water |
| B. | A gas expands spontaneously from high pressure to low pressure |
| C. | Water is converted into ice |
| D. | Both B. & C |
| Answer» E. | |
| 334. |
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 | |
| 335. |
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 | |
| 336. |
Entropy is a/an___________________? |
| A. | State function |
| B. | Macroscopic property |
| C. | Extensive property |
| D. | None of these |
| Answer» E. | |
| 337. |
Entropy is a measure of the _____________ of a system? |
| A. | Disorder |
| B. | Orderly behaviour |
| C. | Temperature changes only |
| D. | None of these |
| Answer» B. Orderly behaviour | |
| 338. |
Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of___________________? |
| A. | Solution |
| B. | Vaporisation |
| C. | Formation |
| D. | Sublimation |
| Answer» C. Formation | |
| 339. |
Entropy change of mixing two liquid substances depends upon the_________________? |
| A. | Molar concentration |
| B. | Quantity (i.e. number of moles) |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 340. |
Entropy change in case of reversible adiabatic process is________________? |
| A. | Minimum |
| B. | Zero |
| C. | Maximum |
| D. | Indeterminate |
| Answer» C. Maximum | |
| 341. |
Entropy change for an irreversible process taking system and surrounding together is___________________? |
| A. | 0 |
| B. | > 0 |
| C. | < 0 |
| D. | None of these |
| Answer» C. < 0 | |
| 342. |
Entropy change for an irreversible isolated system is__________________? |
| A. | ∞ |
| B. | 0 |
| C. | < 0 |
| D. | > 0 |
| Answer» E. | |
| 343. |
Enthalpy of a gas depends upon its___________________? |
| A. | Temperature |
| B. | Mass |
| C. | Volume |
| D. | Pressure |
| Answer» B. Mass | |
| 344. |
Enthalpy ‘H’ is defined as___________________? |
| A. | H = E – PV |
| B. | H = F – TS |
| C. | H – E = PV |
| D. | None of these |
| Answer» D. None of these | |
| 345. |
Enthalpy changes over a constant pressure path are always zero for ______________ gas? |
| A. | Any |
| B. | A perfect |
| C. | An easily liquefiable |
| D. | A real |
| Answer» C. An easily liquefiable | |
| 346. |
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________? |
| A. | Two temperatures only |
| B. | Pressure of working fluid |
| C. | Mass of the working fluid |
| D. | Mass and pressure both of the working fluid |
| Answer» B. Pressure of working fluid | |
| 347. |
Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________? |
| A. | (T2 – T1)/T2 |
| B. | (T2 – T1)/T1 |
| C. | (T1 – T2)/T2 |
| D. | (T1 – T2)/T1 |
| Answer» B. (T2 – T1)/T1 | |
| 348. |
dW and dq are not the exact differential, because q and W are__________________? |
| A. | State functions |
| B. | Path functions |
| C. | Intensive properties |
| D. | Extensive properties |
| Answer» C. Intensive properties | |
| 349. |
During the phase transition, _______________ changes? |
| A. | Pressure |
| B. | Volume |
| C. | Temperature |
| D. | All A , B. and C |
| Answer» C. Temperature | |
| 350. |
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 | |