Multiple Choice Questions and Answers (MCQ) on Environmental Engineering
01. What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillery, dairy and meat packing industries?
(A) Radioactive substances
(B) Natural organic products
(C) Inorganic pollutants
(D) None of these
Answer: Option B
02. 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 starting the mining is
(A) Neutralised by alkali treatment
(B) Left as such without any treatment
(C) Diluted with fresh water to reduce its acidity
(D) None of these
Answer: Option A
03. If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
(A) 50
(B) 500
(C) 1000
(D) 3000 (i.e. 0.3%)
Answer: Option D
04. Ringelmann chart is used for the measurement of the
(A) Combustibles present in automobile exhaust
(B) Smoke density from a chimney
(C) Exhaust gas density
(D) Flue gas temperature
Answer: Option B
05. The permissible color for domestic water supply is __________ ppm.
(A) 1
(B) 20
(C) 100
(D) 1000
Answer: Option B
06. Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
(A) Fire hazards
(B) Explosion hazards
(C) Persistent foam
(D) Depletion of dissolved oxygen
Answer: Option C
07. Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
(A) Phosgene
(B) Bromine
(C) MIC (Methyl isocyanate)
(D) Ozone
Answer: Option C
08. Smog is not formed due to the presence of __________ in the atmosphere.
(A) SO2
(B) NOx
(C) CO2
(D) Any of these
Answer: Option C
09. Average human body contains about __________ percent water by weight.
(A) 20
(B) 40
(C) 70
(D) 85
Answer: Option C
10. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
(A) Mercury
(B) Arsenic
(C) Aluminium
(D) Lead
Answer: Option C
11. Arsenic pollutant is not generated in __________industries.
(A) Tanneries
(B) Glass & ceramic
(C) Beverages
(D) Any of these
Answer: Option C
12. Pick out the wrong statement.
(A) The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere and characterised by a steady decrease in temperature is called stratosphere
(B) Stratosphere is rich in ozone and is located just above the troposphere
(C) Troposphere is a turbulent dusty zone containing much of water vapor and clouds
(D) The earth’s atmosphere is an envelope of gases extending upto a height of about 200 kms
Answer: Option A
13. The pH value of oxidised sewage is about
(A) 1.8
(B) 6.2
(C) 7.3
(D) 13.4
Answer: Option C
14. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because
(A) Of clotting of blood
(B) Of jamming of respiratory tract
(C) It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen
(D) It forms CO2 by combining with oxygen present in the blood
Answer: Option C
15. Growth of __________ is promoted by the presence of manganese in water.
(A) Files
(B) Algae
(C) Micro-organisms
(D) Mosquitoes
Answer: Option C
16. 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 asphyxiate is ≥ __________ percent.
(A) 84
(B) 88
(C) 80
(D) 92
Answer: Option A
17. In water treatment plant, zeolite process is used to remove the __________ of water.
(A) Acidity
(B) Alkalinity
(C) Hardness
(D) Iron & zinc
Answer: Option C
18. Radioactive solid nuclear wastes are disposed off by
(A) High temperature incineration
(B) Pathological incineration
(C) Pyrolysis
(D) Underground burial in concrete containers
Answer: Option D
19. Disinfection of water is done to remove
(A) Color
(B) Bad taste
(C) Foul odour
(D) Bacteria
Answer: Option D
20. Which of the following is an adsorbent used for the removal of SO2 from gas/air?
(A) Bog iron
(B) Limestone powder or alkalised alumina
(C) Silica gel
(D) Active carbon
Answer: Option B
21. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
(A) 105
(B) 135
(C) 160
(D) 185
Answer: Option B
22. ‘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: Option B
23. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
(A) 20
(B) 230
(C) 750
(D) 1500
Answer: Option B
24. __________ plant emits large amount of SO2 as an air pollutant.
(A) Nitric acid
(B) Sulphuric acid
(C) Chlor alkali
(D) Iron & steel
Answer: Option B
25. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozone.
(A) 102
(B) 105
(C) 109
(D) 1015
Answer: Option B