MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4501. |
Presence of high concentration of ozone and smog in atmospheric air causes the |
| A. | embrittlement & decrease of folding resistance of paper. |
| B. | cracking of rubber products. |
| C. | fading of dye on textiles. |
| D. | damage of electrical insulator on high tension power line. |
| Answer» C. fading of dye on textiles. | |
| 4502. |
__________ is removed from water by lime-soda process. |
| A. | Foul smell and taste |
| B. | Iron and manganese |
| C. | Temporary hardness |
| D. | Permanent hardness |
| Answer» D. Permanent hardness | |
| 4503. |
BOD of raw municipal sewage may be in the range of about __________ mg/litre. |
| A. | 1-2 |
| B. | 5-10 |
| C. | 150-300 |
| D. | 2000-3000 |
| Answer» D. 2000-3000 | |
| 4504. |
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in |
| A. | food industry. |
| B. | municipal sewage treatment. |
| C. | petroleum refinery. |
| D. | iron & steel plant. |
| Answer» B. municipal sewage treatment. | |
| 4505. |
When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 4 |
| Answer» E. | |
| 4506. |
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent |
| A. | dental cavities |
| B. | scale formation |
| C. | water-borne disease |
| D. | corrosion |
| Answer» B. scale formation | |
| 4507. |
Lagooning process is mainly a means of the |
| A. | sludge disposal. |
| B. | reduction of excessive flow in sewers. |
| C. | biological treatment of wastes. |
| D. | none of these. |
| Answer» B. reduction of excessive flow in sewers. | |
| 4508. |
Carbon monoxide is a pollutant, which causes |
| A. | respiratory disease (e.g. asthma). |
| B. | asphyxiation (suffocation) leading to death. |
| C. | retardation in crop growth. |
| D. | damage to building materials like marble. |
| Answer» C. retardation in crop growth. | |
| 4509. |
Pollution by particulate matter emission in the atmosphere does not take place during metal |
| A. | grinding |
| B. | machining |
| C. | cutting |
| D. | polishing |
| Answer» E. | |
| 4510. |
Direct reaction of unsaturated hydrocarbons with either NO or NO2 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. | |
| 4511. |
High noise level in a chemical plant can be controlled by the |
| A. | suppression of noise at the source itself. |
| B. | path control of noise. |
| C. | protection of operating personnel. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 4512. |
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels. |
| A. | 35 |
| B. | 75 |
| C. | 95 |
| D. | 105 |
| Answer» C. 95 | |
| 4513. |
Which of the following is a green house gas other than CO2 ? |
| A. | Methane |
| B. | Nitrous oxide |
| C. | Chlorofluro carbons (CFC) |
| D. | All (a), (b) and (c) |
| Answer» E. | |
| 4514. |
Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm. |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 4515. |
Which of the following acts as a natural source of air pollution ? |
| A. | Forest fire |
| B. | Deforestation |
| C. | Volcanic eruption |
| D. | None of these |
| Answer» D. None of these | |
| 4516. |
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel. |
| A. | 1 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 5 | |
| 4517. |
Inorganic impurities causing water pollution is |
| A. | fats |
| B. | carbohydrates |
| C. | salts of metals |
| D. | protein |
| Answer» D. protein | |
| 4518. |
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm. |
| A. | 1 |
| B. | 5 |
| C. | 50 |
| D. | 500 |
| Answer» C. 50 | |
| 4519. |
The pH value of oxidised sewage is about |
| A. | 1.8 |
| B. | 6.2 |
| C. | 7.3 |
| D. | 13.4 |
| Answer» D. 13.4 | |
| 4520. |
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU). |
| A. | 20 |
| B. | 230 |
| C. | 750 |
| D. | 1500 |
| Answer» C. 750 | |
| 4521. |
Polyvinyl chloride containers are not suitable for storing |
| A. | foodstuffs |
| B. | woolen clothes |
| C. | metallic powder |
| D. | none of these |
| Answer» B. woolen clothes | |
| 4522. |
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 N2 in contaminated air at which it acts as a natural asphyxant is __________ percent. |
| A. | 84 |
| B. | 88 |
| C. | 80 |
| D. | 92 |
| Answer» B. 88 | |
| 4523. |
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm. |
| A. | 5 |
| B. | 100 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 100 | |
| 4524. |
Corrosion in boilers can be prevented by |
| A. | deaeration of feed water. |
| B. | enhancing pH of feed water by adding alkali. |
| C. | feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4525. |
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million). |
| A. | 0.002 |
| B. | 0.2 |
| C. | 1.2 |
| D. | 4.8 |
| Answer» C. 1.2 | |
| 4526. |
Biological oxidation ponds remove organic matters present in the polluted water by |
| A. | using the activities of bacteria and other micro organisms. |
| B. | aerobic oxidation. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4527. |
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air ? |
| A. | Active carbon |
| B. | Silica gel |
| C. | Bog iron (iron oxide) |
| D. | Pulverised limestone |
| Answer» C. Bog iron (iron oxide) | |
| 4528. |
Out of the following, TLV of __________ is the minimum (about 0.02 ppm). |
| A. | phosgene |
| B. | bromine |
| C. | MIC (methyl iso-cynate) |
| D. | ozone |
| Answer» D. ozone | |
| 4529. |
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm. |
| A. | <1 |
| B. | 10-100 |
| C. | 100-200 |
| D. | 100-1000 |
| Answer» B. 10-100 | |
| 4530. |
Which of the following industries discharge mercury as a pollutant ? |
| A. | Chloro-alkali industry |
| B. | Tanneries |
| C. | Beverage plant |
| D. | Phosphoric acid plant |
| Answer» B. Tanneries | |
| 4531. |
Threshold limit value (TLV) of CO in air is __________ ppm. |
| A. | 5 |
| B. | 50 |
| C. | 2000 |
| D. | 5000 |
| Answer» C. 2000 | |
| 4532. |
Photochemical smog is formed from automobile exhaust |
| A. | by reaction of hydrocarbon & nitric oxide in presence of sunlight. |
| B. | appears only on sunny days. |
| C. | is harmful for crops and trees also besides causing eye irritation & asthma. |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 4533. |
Disinfection of water is done to remove |
| A. | color |
| B. | bad taste |
| C. | foul odour |
| D. | bacteria |
| Answer» E. | |
| 4534. |
Which of the following fine dust removal equipments is the most efficient ? |
| A. | Bag filter |
| B. | Scrubber |
| C. | Electrostatic precipitator |
| D. | Cyclone separator |
| Answer» D. Cyclone separator | |
| 4535. |
Reinglemann chart is used for the measurement of the |
| A. | combustibles present in automobile exhaust. |
| B. | smoke density from a chimey. |
| C. | exhaust gas density. |
| D. | flue gas temperature. |
| Answer» C. exhaust gas density. | |
| 4536. |
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ? |
| A. | Thermosphere |
| B. | Troposphere |
| C. | Stratosphere |
| D. | none of these |
| Answer» C. Stratosphere | |
| 4537. |
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres. |
| A. | 100 |
| B. | 1000 |
| C. | 400 |
| D. | 4000 |
| Answer» C. 400 | |
| 4538. |
Maximum permissible residual chlorine in treated water should be __________ mg/litre. |
| A. | 0.001 to 0.01 |
| B. | 02 to 0.3 |
| C. | 2 to 3 |
| D. | 5 to 10 |
| Answer» C. 2 to 3 | |
| 4539. |
Which is the most widely used coagulant for the treatment of turbid water ? |
| A. | Alum (aluminium sulphate) |
| B. | Lime |
| C. | Ferric chloride |
| D. | Sodium aluminate |
| Answer» B. Lime | |
| 4540. |
Which of the following is not a natural source of air pollution ? |
| A. | Volcanic eruptions and lightening discharges. |
| B. | Biological decay of vegetable matter. |
| C. | Photochemical oxidation of organic matter. |
| D. | None of these. |
| Answer» E. | |
| 4541. |
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes |
| A. | poor visibility due to sky darkening. |
| B. | irritation in eyes. |
| C. | respiratory trouble. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4542. |
Deaeration of high pressure boiler feed water is done to reduce |
| A. | foaming from boilers. |
| B. | its dissolved oxygen content. |
| C. | its silica content. |
| D. | caustic embrittlement. |
| Answer» C. its silica content. | |
| 4543. |
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant. |
| A. | Calcium |
| B. | Fluorine |
| C. | Phosphorous |
| D. | Sulphur |
| Answer» C. Phosphorous | |
| 4544. |
Exposure to SO2 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. | |
| 4545. |
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank. |
| A. | filtration |
| B. | digestion |
| C. | sedimentation |
| D. | both (b) and (c) |
| Answer» E. | |
| 4546. |
Presence of __________ bacteria in water causes disease like typhoid. |
| A. | aerobic |
| B. | pathogenic |
| C. | anaerobic |
| D. | non-pathogenic |
| Answer» C. anaerobic | |
| 4547. |
The common pollutant generated in chlor-alkali industry and battery manufacture is |
| A. | mercury |
| B. | brine |
| C. | phosphate |
| D. | none of these |
| Answer» B. brine | |
| 4548. |
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water. |
| A. | dissolved oxygen content |
| B. | biological oxygen demand |
| C. | vapor pressure |
| D. | all (a), (b) and (c) |
| Answer» B. biological oxygen demand | |
| 4549. |
Beyond what concentration of H2S in air, acute danger to human life exists ? |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 300 ppm |
| D. | 700 ppm |
| Answer» E. | |
| 4550. |
Reingleman chart is used for the evaluation of __________ pollution. |
| A. | air |
| B. | water |
| C. | noise |
| D. | radioactive |
| Answer» B. water | |