MCQOPTIONS
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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. |
Isotopes of an element have different |
| A. | mass number |
| B. | electronic configuration |
| C. | nuclear charge |
| D. | chemical properties |
| Answer» B. electronic configuration | |
| 2. |
In a pressurised water reactor (PWR), the |
| A. | fuel is natural uranium and heavy water acts both as moderator & coolant. |
| B. | coolant water boils in the core of the reactor. |
| C. | coolant water is pressurised to prevent bulk boiling of water in the core. |
| D. | use of moderator is not required. |
| Answer» D. use of moderator is not required. | |
| 3. |
Which of the following accounts for the maximum energy release in the nuclear fission process ? |
| A. | Kinetic energy of fission products |
| B. | Radioactive decay of fission products |
| C. | Instantaneous release of -rays |
| D. | Kinetic energy of neutrons |
| Answer» B. Radioactive decay of fission products | |
| 4. |
Liquid metal (e.g, . molten sodium) is preferred as a coolant in case of a/an __________ reactor. |
| A. | homogeneous |
| B. | graphite moderated |
| C. | fast breeder |
| D. | enriched uranium (3% U-235) fuelled |
| Answer» D. enriched uranium (3% U-235) fuelled | |
| 5. |
Coolant used in a boiling water reactor is |
| A. | hydrogen gas |
| B. | water |
| C. | steam |
| D. | a mixture of water & steam |
| Answer» E. | |
| 6. |
A thermal nuclear reactor compared to a fast breeder reactor |
| A. | uses slower neutrons for fission. |
| B. | uses faster neutrons for fission. |
| C. | gives higher power density. |
| D. | requires less fuel to run at the same power level. |
| Answer» B. uses faster neutrons for fission. | |
| 7. |
Positron is a/an |
| A. | nucleus having two protons. |
| B. | helium nucleus. |
| C. | electron with positive charge. |
| D. | nucleus with one proton and one neutron. |
| Answer» D. nucleus with one proton and one neutron. | |
| 8. |
Extraction of uranium from its ore is done by __________ method. |
| A. | chemical |
| B. | pyrometallurgical |
| C. | physical beneficiation |
| D. | electrometallurgical |
| Answer» B. pyrometallurgical | |
| 9. |
75% of a radioactive element decays in 6 hours. Its half life period is __________ hours. |
| A. | 3/4 |
| B. | 1/6 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 10. |
Nuclear power plant is not located at |
| A. | Talcher (Orissa) |
| B. | Rawatbhata (Rajasthan) |
| C. | Kalpakkam (Tamilnadu) |
| D. | Kaiga (Karnataka) |
| Answer» B. Rawatbhata (Rajasthan) | |
| 11. |
Heavy water is used as a moderator in a |
| A. | pressurised water reactor (PWR). |
| B. | boiling water reactor (BWR). |
| C. | Candu reactor. |
| D. | molten sodium cooled reactor. |
| Answer» D. molten sodium cooled reactor. | |
| 12. |
Which of the following is a fuel for a fusion reactor (thermonuclear reactor) ? |
| A. | Deuterium and tritium |
| B. | U-233 |
| C. | Thorium |
| D. | Heavy water |
| Answer» B. U-233 | |
| 13. |
Which of the following decreases during evaporative cooling process with recirculated water supply ? |
| A. | Wet bulb temperature |
| B. | Relative humidity |
| C. | Partial pressure of vapour |
| D. | None of these |
| Answer» E. | |
| 14. |
The minimum liquid rate to be used in an absorber corresponds to an operating line |
| A. | of slope = 1 |
| B. | ofslope = 0.1 |
| C. | tangential to the equilibrium curve |
| D. | none of these |
| Answer» D. none of these | |
| 15. |
Laboratory determination of the dif-fusivity of vapor is done by __________ method. |
| A. | wetted wall column |
| B. | Gilliland's |
| C. | Winkel mann's |
| D. | Wike's |
| Answer» D. Wike's | |
| 16. |
For a distillation column operating at minimum reflux, the |
| A. | concentration of liquid and vapour leaving a plate will be same. |
| B. | reflux ratio will be maximum. |
| C. | number of plates required will be maximum. |
| D. | none of these. |
| Answer» D. none of these. | |
| 17. |
Use of packed towers for distillation is generally limited to the |
| A. | small sizes. |
| B. | multicomponent distillation. |
| C. | high pressure operation. |
| D. | vacuum distillation. |
| Answer» B. multicomponent distillation. | |
| 18. |
Flash distillation is suitable for the separation of components |
| A. | having very close boiling points. |
| B. | which form maximum boiling azeotrope. |
| C. | having very wide boiling points. |
| D. | which form minimum boiling azeotrope. |
| Answer» D. which form minimum boiling azeotrope. | |
| 19. |
Alcohol is dehydrated using __________ distillation. |
| A. | extractive |
| B. | azeotropic |
| C. | steam |
| D. | molecular |
| Answer» C. steam | |
| 20. |
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve) |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | none of these |
| Answer» B. increases | |
| 21. |
At constant pressure, with increase of temperature, the dew point will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | increase/decrease ; depends on the temperature |
| Answer» B. decrease | |
| 22. |
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation. |
| A. | lower than |
| B. | higher than |
| C. | equal to |
| D. | either (a) or (b), depends on the mixture composition |
| Answer» B. higher than | |
| 23. |
High pressure at the bottom of a distillation tower handling heat sensitive materials results in |
| A. | thermal decomposition of bottoms. |
| B. | increased relative volatility. |
| C. | erosion of the tower. |
| D. | very efficient operation. |
| Answer» B. increased relative volatility. | |
| 24. |
Separation of two volatile liquids by distillation makes use of their |
| A. | selectivity |
| B. | relative volatility |
| C. | solubility |
| D. | density difference |
| Answer» C. solubility | |
| 25. |
Which of the following increases during evaporative cooling process with recirculated water supply ? |
| A. | Wet bulb temperature |
| B. | Relative humidity |
| C. | Partial pressure of vapour |
| D. | Both (b) and (c) |
| Answer» E. | |
| 26. |
Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content. |
| A. | rotary |
| B. | tray |
| C. | freeze |
| D. | none of these |
| Answer» C. freeze | |
| 27. |
Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn. |
| A. | spray |
| B. | packed |
| C. | bubble cap plate |
| D. | wetted wall |
| Answer» E. | |
| 28. |
With the lowering of equiliDrium pressure, at a given temperature, the amount of ad-sorbate on the adsorbent |
| A. | increases. |
| B. | decreases. |
| C. | remains same. |
| D. | either (a) or (b), depends on the system. |
| Answer» C. remains same. | |
| 29. |
Mass transfer co-efficient is defined as |
| A. | Flux = Co-efficient/concentration difference. |
| B. | Co-efficient = Flux/concentration difference. |
| C. | Flux=concentration difference/co-effi-cient. |
| D. | none of these. |
| Answer» C. Flux=concentration difference/co-effi-cient. | |
| 30. |
When an unsaturated air-water mixture is heated at constant pressure, then |
| A. | the partial pressure of water vapour increases. |
| B. | the specific humidity decreases. |
| C. | The relative humidity increases. |
| D. | the relative humidity decreases. |
| Answer» E. | |
| 31. |
During sensible cooling process |
| A. | relative humidity decreases |
| B. | relative humidity increases |
| C. | wet bulb temperature decreases |
| D. | both (b) and (c) |
| Answer» E. | |
| 32. |
Leaching of coarse solid lumps is also termed as |
| A. | decoction |
| B. | dissolution |
| C. | percolation |
| D. | agitation and settling |
| Answer» D. agitation and settling | |
| 33. |
The main reason for dividing a tall packed tower into series of small towers is to |
| A. | minimise the overall pressure drop. |
| B. | avoid flooding. |
| C. | reduce liquid hold up. |
| D. | avoid channeling. |
| Answer» E. | |
| 34. |
In liquid extraction, if the selectivity is unity, then |
| A. | separation of the constituents is the most effective. |
| B. | no separation will occur. |
| C. | amount of solvent required will be minimum. |
| D. | solvent flow rate should be very low. |
| Answer» C. amount of solvent required will be minimum. | |
| 35. |
Co-current absorbers are usually used when the gas to be dissolved in the liquid is |
| A. | sparingly soluble |
| B. | highly soluble |
| C. | a pure substance |
| D. | a mixture |
| Answer» D. a mixture | |
| 36. |
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ? |
| A. | 90 |
| B. | 91.5 |
| C. | 95 |
| D. | 99 |
| Answer» D. 99 | |
| 37. |
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent. |
| A. | 100 |
| B. | 0 |
| C. | 50 |
| D. | between 0 and 100 |
| Answer» C. 50 | |
| 38. |
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is |
| A. | equal to the heat of formation of surface compound. |
| B. | equal to the heat of wetting. |
| C. | zero. |
| D. | called integral heat of adsorption. |
| Answer» C. zero. | |
| 39. |
The value of L/mG ratio for economical absorption operation ranges from |
| A. | 0.5 to 0.8 |
| B. | 0.8 to 1.2 |
| C. | 1.25 to 2.0 |
| D. | 2.5 to 3.5 |
| Answer» D. 2.5 to 3.5 | |
| 40. |
Large scale usage of flash distillation is practised in |
| A. | soap manufacturing |
| B. | ammonia synthesis plant |
| C. | polymerisation industry |
| D. | petroleum refinning |
| Answer» E. | |
| 41. |
Paper industry employs __________ driers. |
| A. | cylinder |
| B. | rotary |
| C. | spray |
| D. | fluidised bed |
| Answer» B. rotary | |
| 42. |
Which of the following has the same dimension as mass diffusivity ? |
| A. | Momentum flux |
| B. | Kinematic viscosity |
| C. | Thermal diffusivity |
| D. | Both (b) and (c) |
| Answer» E. | |
| 43. |
Pick out the wrong statement pertaining to the cooling towers. |
| A. | In case of induced draft cooling tower, the fan is placed at the top of the tower. |
| B. | Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air. |
| C. | A natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low. |
| D. | Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature. |
| Answer» E. | |
| 44. |
For water-ethanol system, the minimum reflux ratio |
| A. | is computed from the slope of the upper operating line that is tangent to the equilibrium curve. |
| B. | is computed from the intercept of the operating line. |
| C. | cannot be computed. |
| D. | is the optimum reflux ratio. |
| Answer» B. is computed from the intercept of the operating line. | |
| 45. |
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) |
| A. | 500 |
| B. | 1200 |
| C. | 900 |
| D. | 800 |
| Answer» B. 1200 | |
| 46. |
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption. |
| A. | lower than |
| B. | higher than |
| C. | same as |
| D. | either same or higher than |
| Answer» B. higher than | |
| 47. |
Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is |
| A. | not possible in the second case unless vacuum is applied. |
| B. | not possible in the second case unless high pressure is applied. |
| C. | more readily done in the second case compared to first one. |
| D. | none of these |
| Answer» D. none of these | |
| 48. |
'ADDUCTS' and 'CLATHRATES' are used in case of |
| A. | extractive distillation. |
| B. | crystallisation. |
| C. | absorption. |
| D. | none of these. |
| Answer» C. absorption. | |
| 49. |
Adsorption is an unit operation which generally involves __________ systems. |
| A. | liquid-solid |
| B. | gas-solid |
| C. | fluid-solid |
| D. | solid-solid |
| Answer» D. solid-solid | |
| 50. |
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated. |
| A. | molecular |
| B. | azeotropic |
| C. | extractive |
| D. | flash. |
| Answer» D. flash. | |