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.
| 401. |
At absolute zero temperature, the _____________ of the gas is zero? |
| A. | Pressure |
| B. | Volume |
| C. | Mass |
| D. | None of these |
| Answer» C. Mass | |
| 402. |
At a given temperature, the volume of a gas dissolved in a solvent _______________ with increase in pressure? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | May increase or decrease; depends on the gas |
| Answer» D. May increase or decrease; depends on the gas | |
| 403. |
At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is__________________? |
| A. | 1.572 |
| B. | 1.9398 |
| C. | 3.389 |
| D. | 4.238 |
| Answer» B. 1.9398 | |
| 404. |
As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches_______________________? |
| A. | Unity |
| B. | Zero |
| C. | That of the heat of reaction |
| D. | Infinity |
| Answer» C. That of the heat of reaction | |
| 405. |
As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches________________? |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | None of these |
| Answer» B. Unity | |
| 406. |
As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is_________________? |
| A. | Not changed |
| B. | Decreasing |
| C. | Increasing |
| D. | Data sufficient, can’t be predicted |
| Answer» C. Increasing | |
| 407. |
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches____________________? |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | An indeterminate value |
| Answer» C. Infinity | |
| 408. |
Any substance above its critical temperature exists as _____________________? |
| A. | Saturated vapour |
| B. | Solid |
| C. | Gas |
| D. | Liquid |
| Answer» D. Liquid | |
| 409. |
Answer: Option B 392. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to _____________ °C? |
| A. | 270 |
| B. | 327 |
| C. | 300 |
| D. | 540 |
| Answer» C. 300 | |
| 410. |
An isolated system can exchange ______________ with its surroundings? |
| A. | Matter |
| B. | Energy |
| C. | Neither matter nor energy |
| D. | Both matter and energy |
| Answer» D. Both matter and energy | |
| 411. |
An isentropic process is carried out at constant____________________? |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | All (A), B. and (C) |
| Answer» B. Pressure | |
| 412. |
An irreversible process____________________? |
| A. | Is the analog of linear frictionless motion in machines |
| B. | Is an idealised visualisation of behaviour of a system |
| C. | Yields the maximum amount of work |
| D. | Yields an amount of work less than that of a reversible process |
| Answer» E. | |
| 413. |
An ideal liquid refrigerant should______________________? |
| A. | Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils |
| B. | Not have unduly high vapour pressure at the condenser temperature |
| C. | Both A. a |
| D. | Have low specific heat |
| Answer» D. Have low specific heat | |
| 414. |
An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to_________________? |
| A. | 12 P1V1 |
| B. | 6 P1 V1 |
| C. | 3 P1V1 |
| D. | P1 V1 |
| Answer» D. P1 V1 | |
| 415. |
All gases except ____________ shows a cooling effect during throttling process at atmospheric temperature and pressure? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Air |
| D. | Hydrogen |
| Answer» E. | |
| 416. |
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________? |
| A. | CO2 |
| B. | H2 |
| C. | O2 |
| D. | N2 |
| Answer» C. O2 | |
| 417. |
All gases above its inversion temperature, in a throttling process will show__________________? |
| A. | A heating effect |
| B. | No change in temperature |
| C. | A cooling effect |
| D. | Either A. or (C) |
| Answer» B. No change in temperature | |
| 418. |
Air-refrigeration cycle________________? |
| A. | Is the most efficient of all refrigeration cycles |
| B. | Has very low efficiency |
| C. | Requires relatively large quantities of air to achieve a significant amount of refrigeration |
| D. | Both B. and C |
| Answer» E. | |
| 419. |
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 × (333/7) |
| D. | 300 × (35/7) |
| Answer» B. 300 × (33/5) | |
| 420. |
After throttling, gas temperature___________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | May increase or decrease; depends on the nature of the gas |
| Answer» B. Increases | |
| 421. |
Adiabatic compression of a saturated water vapour makes it ____________________ ? |
| A. | Supersaturated |
| B. | Superheated |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» C. Both A. and B | |
| 422. |
Activity co-efficient is a measure of the____________________? |
| A. | Departure from ideal solution behaviour |
| B. | Departure of gas phase from ideal gas law |
| C. | Vapour pressure of liquid |
| D. | None of these |
| Answer» B. Departure of gas phase from ideal gas law | |
| 423. |
Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________? |
| A. | Sublimation |
| B. | Fusion |
| C. | Transition |
| D. | Transition |
| Answer» D. Transition | |
| 424. |
Absolute zero temperature signifies the ____________________? |
| A. | Minimum temperature attainable |
| B. | Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in |
| C. | Temperature of the heat reservoir to which a Carnot engine rejects no heat |
| D. | None of these |
| Answer» D. None of these | |
| 425. |
A/an ____________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor? |
| A. | Isolated |
| B. | Closed |
| C. | Open |
| D. | None of these |
| Answer» D. None of these | |
| 426. |
A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the _____________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) ? |
| A. | Logarithmic |
| B. | Arithmetic |
| C. | Geometric |
| D. | Harmonic |
| Answer» D. Harmonic | |
| 427. |
A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by_________________? |
| A. | P1ACBP2P1 |
| B. | ACBB1A1A |
| C. | ACBDA |
| D. | ADBB1A1A |
| Answer» D. ADBB1A1A | |
| 428. |
A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ? |
| A. | Δ S1 is always Δ SR |
| B. | Δ S1 is always > Δ SR |
| C. | Δ S1 is always = Δ SR |
| Answer» C. Δ S1 is always = Δ SR | |
| 429. |
A system is said to be isopiestic, if there is no ______________ change? |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | None of these |
| Answer» C. Volume | |
| 430. |
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 | |
| 431. |
A system in which there is exchange of energy but not of mass, is called a/an ____________ system? |
| A. | Isolated |
| B. | Open |
| C. | Insulated |
| D. | Closed |
| Answer» E. | |
| 432. |
A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount”. This is_________________? |
| A. | The distribution law |
| B. | Followed from Margules equation |
| C. | A corollary of Henry’s law |
| D. | None of these |
| Answer» B. Followed from Margules equation | |
| 433. |
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________? |
| A. | -1.87 |
| B. | 0 |
| C. | 1.26 |
| D. | 3.91 |
| Answer» C. 1.26 | |
| 434. |
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 | |
| 435. |
A refrigerator works on the principle of _____________ law of thermodynamics? |
| A. | Zeroth |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 436. |
A refrigerator may be termed as a____________________? |
| A. | Heat pump |
| B. | Heat engine |
| C. | Carnot engine |
| D. | None of these |
| Answer» B. Heat engine | |
| 437. |
A refrigeration cycle is the same as a _____________ cycle? |
| A. | Turbine |
| B. | Heat engine |
| C. | Reversed heat engine |
| D. | None of these |
| Answer» D. None of these | |
| 438. |
A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________? |
| A. | Temperature only |
| B. | Temperature and pressure only |
| C. | Temperature, pressure and liquid composition xi only |
| D. | Temperature, pressure, liquid composition xi and vapour composition yi |
| Answer» D. Temperature, pressure, liquid composition xi and vapour composition yi | |
| 439. |
A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid? |
| A. | Sub-cooled |
| B. | Saturated |
| C. | Non-solidifiable |
| D. | None of these |
| Answer» B. Saturated | |
| 440. |
A large iceberg melts at the base, but not at the top, because of the reason that_________________? |
| A. | Ice at the base contains impurities which lowers its melting point |
| B. | Due to the high pressure at the base, its melting point reduces |
| C. | The iceberg remains in a warmer condition at the base |
| D. | All A, B. and C |
| Answer» C. The iceberg remains in a warmer condition at the base | |
| 441. |
A gas shows deviation from ideal behaviour at______________? |
| A. | Low pressure and high temperature |
| B. | Low pressure and low temperature |
| C. | Low temperature and high pressure |
| D. | High temperature and high pressure |
| Answer» D. High temperature and high pressure | |
| 442. |
A gas performs the maximum work, when it expands___________________? |
| A. | Non-uniformly |
| B. | Adiabatically |
| C. | Isobarically |
| D. | Isothermally |
| Answer» D. Isothermally | |
| 443. |
A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system is______________? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» B. 4 | |
| 444. |
A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be _____________ c.c? |
| A. | 2.73 |
| B. | 28.3 |
| C. | 273 |
| D. | 283 |
| Answer» C. 273 | |
| 445. |
A gas can be liquefied by pressure alone only, when its temperature is _____________ its critical temperature? |
| A. | Less than |
| B. | More than |
| C. | Equal to or higher than |
| D. | Less than or equal to |
| Answer» E. | |
| 446. |
A domestic refrigerator has a/an ____________ cooled condenser? |
| A. | Water |
| B. | Air |
| C. | Evaporative |
| D. | Gas |
| Answer» C. Evaporative | |
| 447. |
A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be _____________ litres? |
| A. | 448 |
| B. | 224 |
| C. | 22.4 |
| D. | Data insufficient; can’t be computed |
| Answer» B. 224 | |
| 448. |
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 | |
| 449. |
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________________? |
| A. | its internal energy (U) decreases and its entropy (S) increases |
| B. | U and S both decreases |
| C. | U decreases but S is constant |
| D. | U is constant but S decreases |
| Answer» C. U decreases but S is constant | |
| 450. |
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________? |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | None of these |
| Answer» D. None of these | |