MCQOPTIONS
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MCQOPTIONS
This section includes 255 Mcqs, each offering curated multiple-choice questions to sharpen your Arithmetic Ability knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The earth\'s atmosphere is an envelope of gases present upto a height of about __________ kms. |
| A. | 200 |
| B. | 10 |
| C. | 2000 |
| D. | 1000 |
| Answer» D. 1000 | |
| 2. |
Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer). |
| A. | 450 |
| B. | 250 |
| C. | 750 |
| D. | 650 |
| Answer» E. | |
| 3. |
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is |
| A. | 0.107 |
| B. | 0.31 |
| C. | 0.215 |
| D. | 0.017 |
| Answer» D. 0.017 | |
| 4. |
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures. |
| A. | 750 |
| B. | 350 |
| C. | 1500 |
| D. | 1050 |
| Answer» B. 350 | |
| 5. |
Fenske\'s equation for determining the minimum number of theoretical stages in distillation column holds good, when the |
| A. | mixture (to be separate shows negative deviation from ideality. |
| B. | relative volatility is reasonably constant. |
| C. | multicomponent distillation is involve |
| D. | mixture (to be separate shows positive deviation from ideality. |
| Answer» C. multicomponent distillation is involve | |
| 6. |
World\'s worst radioactive pollution was caused by nuclear reactor disaster which occured in |
| A. | Chernobyl (undivided U.S.S.R.) |
| B. | Arizona (U.S.) |
| C. | Moscow (U.S.S.R.) |
| D. | Pensylvania (U.S.) |
| Answer» B. Arizona (U.S.) | |
| 7. |
Noise level during normal conversation among men is about __________ decibles |
| A. | 45 |
| B. | 10 |
| C. | 115 |
| D. | 90 |
| Answer» E. | |
| 8. |
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the |
| A. | 60 |
| B. | 5 |
| C. | 40 |
| D. | 20 |
| Answer» E. | |
| 9. |
Which of the following solutions will follow Raoult\'s law most closely ? |
| A. | 35% solution of camphor in water. |
| B. | A solution of benzene, toluene and oxylene |
| C. | A solution of polar organic compounds (not of homologs of a series) |
| D. | 35% solution of NH3 in water. |
| Answer» C. A solution of polar organic compounds (not of homologs of a series) | |
| 10. |
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the |
| A. | 51 min |
| B. | 15 min |
| C. | 94 min |
| D. | 71 min |
| Answer» E. | |
| 11. |
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperatu |
| A. | the system comprises of miscible liquids |
| B. | the system comprises of partially mis-cible liquids. |
| C. | on heating, a vapor phase will appear ; while on cooling, a solid phase will appear |
| D. | the system comprises of an azeotrope |
| Answer» D. the system comprises of an azeotrope | |
| 12. |
Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C. |
| A. | 100 |
| B. | 50 |
| C. | 200 |
| D. | 150 |
| Answer» E. | |
| 13. |
The term \"cooling range\" in a cooling tower refers to the difference in the temperature of |
| A. | hot water entering the tower and the wet bulb temperature of the surrounding air. |
| B. | cold water leaving the tower and the wet bulb temperature of the surrounding air. |
| C. | none of these |
| D. | hot water entering the tower and the cooled water leaving the tower. |
| Answer» E. | |
| 14. |
\'Light water\' used as a coolant in nuclear reactor is nothing but |
| A. | mildly acidic (pH = 6) water. |
| B. | ordinary water. |
| C. | none of these. |
| D. | mildly alkaline (pH = 8) water. |
| Answer» C. none of these. | |
| 15. |
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a |
| A. | higher absolute (specifi humidity. |
| B. | higher dew point. |
| C. | higher wet bulb temperature. |
| D. | higher relative humidity |
| Answer» E. | |
| 16. |
Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is |
| A. | more |
| B. | less |
| C. | unpredictable |
| D. | same |
| Answer» C. unpredictable | |
| 17. |
The new nucleus formed after β-decay of a radioactive element has |
| A. | less atomic weight |
| B. | less atomic number |
| C. | more atomic weight |
| D. | more atomic number |
| Answer» C. more atomic weight | |
| 18. |
The progressive warming up of the earth\'s surface is mainly due to the |
| A. | blanketing effect of CO2 in the atmosphere. |
| B. | automobile exhaust. |
| C. | thickening of ozone layer. |
| D. | de-forestation |
| Answer» B. automobile exhaust. | |
| 19. |
When the liquid phase and vapour phase of a binary system obeys Raoult\'s and Dalton\'s law respectively, the relative volatility is the ratio of |
| A. | vapour pressure of component A to the total pressure. |
| B. | vapour pressure of component A to that of component |
| C. | partial pressure of component A to the total pressure. |
| D. | vapour pressure of component A to the partial pressure of |
| Answer» C. partial pressure of component A to the total pressure. | |
| 20. |
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels |
| A. | 120 |
| B. | 90 |
| C. | 180 |
| D. | 150 |
| Answer» B. 90 | |
| 21. |
Raoult\'s law applies to the |
| A. | non-ideal solution only. |
| B. | all liquid solutions |
| C. | solvents. |
| D. | non-volatile solute. |
| Answer» D. non-volatile solute. | |
| 22. |
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by |
| A. | convection |
| B. | conduction |
| C. | can not be predicte |
| D. | radiation |
| Answer» E. | |
| 23. |
A train overtakes two persons walking along a railway track. The first one walks at 4.5 km/hr. The other one walks at 5.4 km/hr. The train needs 8.4 and 8.5 seconds respectively to overtake them. What is the speed of the train if both the persons are |
| A. | 72 km/hr |
| B. | 66 km/hr |
| C. | 81 km/hr |
| D. | 78 km/hr |
| Answer» D. 78 km/hr | |
| 24. |
Positive deviation from Raoult\'s law means a mixture whose total pressure is |
| A. | less than that computed for ideality. |
| B. | greater than that computed for ideality. |
| C. | none of these. |
| D. | less than the sum of the vapour pressure of the components. |
| Answer» C. none of these. | |
| 25. |
Test Question |
| A. | Option B |
| B. | Option A |
| C. | Option D |
| D. | Option C |
| Answer» C. Option D | |
| 26. |
The McCabe Δ L law states that the |
| A. | linear crystal growth rate depends on the degree of supersaturation. |
| B. | molar heats of vaporisation of components are nearly equal. |
| C. | linear crystal growth rate depends on the crystal size. |
| D. | linear crystal growth rate does not depend on the crystal size. |
| Answer» C. linear crystal growth rate depends on the crystal size. | |
| 27. |
__________ strain is measured using a \'strain rosetter\'. |
| A. | Shear |
| B. | Volumetric |
| C. | none of these |
| D. | Linear |
| Answer» E. | |
| 28. |
Compound A is extracted from a solution of A B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. |
| A. | 0.5 |
| B. | 0.25 |
| C. | 0.9 |
| D. | 0.7 |
| Answer» B. 0.25 | |
| 29. |
Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly use |
| A. | 19 |
| B. | 16 |
| C. | 38 |
| D. | 28 |
| Answer» B. 16 | |
| 30. |
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m3.(μg-microgram) |
| A. | 90 |
| B. | 10 |
| C. | 750 |
| D. | 800 |
| Answer» B. 10 | |
| 31. |
5-200 μm size particles are called |
| A. | powder |
| B. | colloids or aerosols |
| C. | smoke |
| D. | dust |
| Answer» C. smoke | |
| 32. |
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C |
| A. | 3000 |
| B. | 2000 |
| C. | 6000 |
| D. | 4500 |
| Answer» E. | |
| 33. |
Raoult\'s law is applicable to the |
| A. | real solutions |
| B. | ideal solutions |
| C. | non-ideal gases |
| D. | mixture of water and alcohol |
| Answer» C. non-ideal gases | |
| 34. |
Stefan\'s law describes the mass transfer by |
| A. | bulk flow |
| B. | diffusion |
| C. | neither 'a' nor 'b' |
| D. | both 'a' & 'b' |
| Answer» E. | |
| 35. |
Which of the following radioactive wastes emits all %u03B1, %u03B2 & %u03B3 rays and hence is the most hazardous of all radioactive emitters? |
| A. | Sr-90 |
| B. | I-131 |
| C. | Ra-226 |
| D. | Au-198 |
| Answer» D. Au-198 | |
| 36. |
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it. |
| A. | potassium cyanide |
| B. | coal ash |
| C. | none of these |
| D. | ortho-xylene |
| Answer» B. coal ash | |
| 37. |
A train 60 m long passes a platform 90 m long in 10 seconds. The speed of the train is |
| A. | 60 km/h |
| B. | 58 km/h |
| C. | 54 km/h |
| D. | 50 km/h |
| Answer» D. 50 km/h | |
| 38. |
A train 110 m long is traveling at a speed of 59kmph. The time in which it will pass a passer by, walking at 4kmph in the same directions, is |
| A. | 7 1/5 s |
| B. | 3 2/3 s |
| C. | 4 3/5 s |
| D. | 5 1/3 s |
| Answer» B. 3 2/3 s | |
| 39. |
A train crosses a platform 100 m long in 60 seconds at a speed of 45kmph. The time by the train to cross an electric pole is |
| A. | 52 s |
| B. | 48 s |
| C. | 43 s |
| D. | 38 s |
| Answer» B. 48 s | |
| 40. |
With a speed of 60kmph a train crosses a pole in 30 seconds. The length of the train is |
| A. | 300m |
| B. | 400m |
| C. | 500m |
| D. | 600m |
| Answer» D. 600m | |
| 41. |
A train takes 18 seconds to pass completely though a station162 m long and 15 seconds though another station 120 m long. The length of the train is |
| A. | 60m |
| B. | 70m |
| C. | 80m |
| D. | 90m |
| Answer» E. | |
| 42. |
A train 120 m long crosses a standing man in 15 seconds. The speed of the train is |
| A. | 19.6 km/h |
| B. | 18.8 km/h |
| C. | 28.8 km/h |
| D. | 22.6 km/h |
| Answer» D. 22.6 km/h | |
| 43. |
Two trains each 200 m long are running on parallel rails at the rate of 40kmph and 45kmph respectively. In how much time will they cross each other, if they are running in the same direction? |
| A. | 128 s |
| B. | 288 s |
| C. | 342 s |
| D. | 368 s |
| Answer» D. 368 s | |
| 44. |
A train 150 m long takes 20 seconds to cross a platform 450 m long. The speed of the train is |
| A. | 20 m/s |
| B. | 25 m/s |
| C. | 30 m/s |
| D. | 40 m/s |
| Answer» D. 40 m/s | |
| 45. |
X and Y are two stations which are 280 km apart. A train starts at a certain time from X and travels towards Y at 60 km/h. After 2 hours, another train starts from Y and travels towards X at 20 km/h. After how many hours does the train leaving from X meets the train which left from Y?_x005F_x000D_ |
| A. | 2 hours |
| B. | 6 hours |
| C. | 3 hours |
| D. | 4 hours |
| Answer» E. | |
| 46. |
Two trains, one from Hyderabd to Bangalore and the other from Bangalore to Hyderabad, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds is  ? |
| A. | 0.12777777777778 |
| B. | 0.16875 |
| C. | 0.085416666666667 |
| D. | 0.12638888888889 |
| Answer» C. 0.085416666666667 | |
| 47. |
Two trains start moving from stations S and R. Both trains move towards each other at speeds of 35 km/hr and 42 km/hr respectively. When they meet each other, the second train has travelled 90 km more than the first. What is the distance (in km) between S and R?_x005F_x000D_ |
| A. | 450 |
| B. | 990 |
| C. | 540 |
| D. | 1040 |
| Answer» C. 540 | |
| 48. |
Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is  ? |
| A. | 0.043055555555556 |
| B. | 0.12569444444444 |
| C. | 0.17152777777778 |
| D. | 0.12638888888889 |
| Answer» E. | |
| 49. |
What is the time taken by a 180 m long train running at 54 kmph to cross a man standing on a platform? |
| A. | 10 sec |
| B. | 12 sec |
| C. | 11 sec |
| D. | 13 sec |
| Answer» C. 11 sec | |
| 50. |
Two trains started at the same time, one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other the ratio of the speeds of the two trains was |
| A. | 0.084027777777778 |
| B. | 0.12638888888889 |
| C. | 0.16875 |
| D. | 0.21111111111111 |
| Answer» C. 0.16875 | |