MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Coal mines drainage waste water (acidic in nature) results from the earth\'s water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before sta |
| A. | left as such without any treatment. |
| B. | neutralised by alkali treatment. |
| C. | none of these. |
| D. | diluted with fresh water to reduce its acidity. |
| Answer» C. none of these. | |
| 2. |
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called |
| A. | dust |
| B. | grit |
| C. | smoke |
| D. | powder |
| Answer» C. smoke | |
| 3. |
\'Particulate\' air pollutants are finely divided solids and liquids. Which of the following is not a \'particulate\' ? |
| A. | Smoke & fumes |
| B. | Dust & mists |
| C. | None of these |
| D. | Photochemical smog & soot |
| Answer» D. Photochemical smog & soot | |
| 4. |
The maximum CO 2 is emitted into the atmosphere by |
| A. | combustion |
| B. | urea |
| C. | biomass burning |
| D. | trees |
| Answer» B. urea | |
| 5. |
Which of the following plants does not emit appreciable amount of SO 2 in atmosphere ? |
| A. | Thermal power plant |
| B. | Petroleum refinery |
| C. | Nitric acid plant |
| D. | Sulphuric acid plant |
| Answer» D. Sulphuric acid plant | |
| 6. |
Exposure to SO 2 containing chimney gases results in the |
| A. | reduction in strength of leather & cloth. |
| B. | acceleration of corrosion rates of metals. |
| C. | increased drying & hardening time of paints. |
| D. | all (a), (b)and(c). |
| Answer» E. | |
| 7. |
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km. |
| A. | 0.05 |
| B. | 1 |
| C. | 6.5 |
| D. | 15 |
| Answer» D. 15 | |
| 8. |
Beyond what concentration of H 2 S in air, acute danger to human life exists ? |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 300 ppm |
| D. | 700 ppm |
| Answer» E. | |
| 9. |
TLV of NO 2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO 2 causes |
| A. | skin disorder |
| B. | bronchitis |
| C. | bone disease |
| D. | cancer |
| Answer» C. bone disease | |
| 10. |
Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the |
| A. | industrial chimney exhaust. |
| B. | automobiles exhaust. |
| C. | photochemical reaction in polluted atmosphere. |
| D. | burning of domestic fuel. |
| Answer» C. photochemical reaction in polluted atmosphere. | |
| 11. |
Water filtration rate in a slow sand filter ranges from __________ litres/m 2 /hr. |
| A. | 10 to 20 |
| B. | 100 to 200 |
| C. | 1500 to 2500 |
| D. | 4000 to 5000 |
| Answer» C. 1500 to 2500 | |
| 12. |
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N 2 in contaminated air at which it acts as a natural asphyxant is ? __________ percent. |
| A. | 84 |
| B. | 88 |
| C. | 80 |
| D. | 92 |
| Answer» B. 88 | |
| 13. |
Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m 2 /hr. |
| A. | 0.1 to 1 |
| B. | 3 to 6 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» C. 10 to 15 | |
| 14. |
When the concentration of SO 2 in air is greater than __________ ppm, it gives a pungent smell. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 4 |
| Answer» E. | |
| 15. |
Direct reaction of unsaturated hydrocarbons with either NO or NO 2 produces an eye irritating pollutant compound known as |
| A. | photochemical smog. |
| B. | peroxy acetyl nitrate (PAN) or methyl nitrile. |
| C. | benzopyrene. |
| D. | poly acrylonitrile |
| Answer» C. benzopyrene. | |
| 16. |
Which of the following is a green house gas other than CO 2 ? |
| A. | Methane |
| B. | Nitrous oxide |
| C. | Chlorofluro carbons (CFC) |
| D. | All (a), (b) and (c) |
| Answer» E. | |
| 17. |
In troposphere (the weather domain), the temperature ' t ' at height ' h ' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.) |
| A. | t = 15 - 0.0065 h |
| B. | t = 15 + 0.0065 h |
| C. | t = 0.0035 h -15 |
| D. | t = 15 - 0.0035 h |
| Answer» B. t = 15 + 0.0065 h | |
| 18. |
Higher concentration of CO 2 in atmosphere |
| A. | allows visible solar radiation (ultraviolet) of short wave-length to pass through. |
| B. | reflects and absorbs the longer wavelength (infra-red) radiations. |
| C. | prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 19. |
Death may occur, when SO 2 concentration in atmospheric air exceeds __________ ppm. |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 20. |
In water treatment, alum[Al 2 (SO 4 ) 3 ] is used for the process of |
| A. | filtration |
| B. | coagulation |
| C. | sedimentation |
| D. | disinfection |
| Answer» C. sedimentation | |
| 21. |
__________ plant emits large amount of SO 2 as an air pollutant. |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Chloralkali |
| D. | Iron & steel |
| Answer» C. Chloralkali | |
| 22. |
Which of the following is an adsorbant used for the removal of SO 2 from gas/air ? |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 23. |
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ ?g/m 3 .(?g-microgram) |
| A. | 10 |
| B. | 90 |
| C. | 800 |
| D. | 750 |
| Answer» C. 800 | |
| 24. |
Acute danger to human life (i.e. death) exists, if the concentration of CO 2 in atmospheric air exceeds __________ percent (by volume). |
| A. | 1 |
| B. | 3 |
| C. | 7 |
| D. | 20 |
| Answer» E. | |
| 25. |
Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate' ? |
| A. | Dust & mists |
| B. | Smoke & fumes |
| C. | Photochemical smog & soot |
| D. | None of these |
| Answer» E. | |
| 26. |
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. | coal ash |
| B. | potassium cyanide |
| C. | ortho-xylene |
| D. | none of these |
| Answer» C. ortho-xylene | |
| 27. |
Nitrogen oxides (NO x ) is not produced in the __________ industry. |
| A. | nitric acid making |
| B. | nitrogenous fertiliser |
| C. | detergent |
| D. | any of these |
| Answer» D. any of these | |
| 28. |
Pneumoconiosis' is a disease caused by the inhalation of __________ dust. |
| A. | coal |
| B. | uranium ore |
| C. | iron ore |
| D. | lime |
| Answer» B. uranium ore | |
| 29. |
TLV of ozone (O 3 ) and phosgene (COCl 2 ) in air is __________ ppm. |
| A. | 0.1 |
| B. | 25 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 25 | |
| 30. |
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO 2 in air is __________ ppm. |
| A. | 5 |
| B. | 500 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 500 | |
| 31. |
H 2 S present in gaseous stream can be removed by adsorption on |
| A. | silica gel |
| B. | active carbon |
| C. | bog iron |
| D. | limestone powder |
| Answer» D. limestone powder | |
| 32. |
Maximum allowable concentration of CO 2 in air for safe working is __________ ppm (parts per million). |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |