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chemical engineering chemical environmental engineering chemical engineering MCQs

Practise multiple-choice questions from chemical engineering chemical environmental engineering chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical environmental engineering chemical engineering Mcqs
1. Infective bacteria in water is killed by the _____________ process?
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A. Sterilisation

B. Aeration

C. Disinfection

D. None of these

2. Pick out the wrong statement ?
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A. The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere

B. Troposphere is a turbulent dusty zone containing much of water vapor and clouds

C. The earths atmosphere is an envelope of gases extending upto a height of about 200 kms

D. Stratosphere is rich in ozone and is located just above the troposphere

E. characterised by a steady decrease in temperature is called stratosphere</strong>

3. Corrosion in boilers can be prevented by _________________?
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A. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen

B. All A., B. and C.

C. Deaeration of feed water

D. prevents corrosion

E. Enhancing pH of feed water by adding alkali

4. TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?
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A. Skin disorder

B. Bronchitis

C. Cancer

D. Bone disease

5. In a sedimentation tank, the detention period for water ranges from _____________ hours?
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A. 2 to 4

B. 24 to 32

C. 8 to 12

D. 16 to 20

6. Fresh domestic sewage is _______________ in color?
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A. Grey

B. Black

C. Red

D. Dark brown

7. Exposure to chemicals having carcinogenic properties cause ____________________?
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A. Cancer

B. Asphyxiation (suffocation)

C. Asthma

D. Dermatitis (skin disorder)

8. The weakest sound that can be heard by a person in a quiet environment is equivalent to ____________ decibel ?
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A. 50

B. 10

C. 5

D. 1
9. The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________?
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A. Phosphate

B. None of these

C. Brine

D. Mercury
10. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?
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A. Of jamming of respiratory tract

B. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it

C. apable of absorbing oxygen</strong>

D. It forms CO2 by combining with oxygen present in the blood

E. Of clotting of blood

11. Aerosols present in atmospheric air may be__________________?
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A. Neutral

B. Positively charged

C. Combination of all A., B. & C.

D. Negatively charged

12. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?
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A. Hydrogen

B. Acetylene

C. Carbon monoxide

D. Ammonia

13. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?
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A. 0.002

B. 4.8

C. 1.2

D. 0.2
14. Exposure to chemicals having carcinogenic properties cause___________________?
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A. Asphyxiation

B. Dermatitis (skin disorder)

C. Cancer

D. Asthma

15. Which of the following is the most lethal water pollutant ?
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A. Phenol and cyanide

B. Alkalis

C. Suspended solids

D. Chlorine

16. Which of the following air pollutants is not toxic to vegetation i.e., doesnt cause vegetation damage ?
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A. Hydrogen fluoride & nitrogen oxides

B. Sulphur dioxide & spray of weed killers

C. Smog & ozone

D. Carbon monoxide
17. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?
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A. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter

B. Coagulation and flocculation of colloids

C. All A., B. and C.

D. Oxidation of carbonaceous matter to CO2

E. the nitrite and eventually to the nitrate

18. In water treatment plant, zeolite process is used to remove the _____________ of water?
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A. Acidity

B. Iron & zinc

C. Hardness

D. Alkalinity

19. Noise level inside a jet airliner in normal flight is about ______________ decibels?
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A. 80

B. 125

C. 150

D. 100
20. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?
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A. All A., B. and C.

B. Vapor pressure

C. Biological oxygen demand

D. Dissolved oxygen content