ENVIRONMENTAL POLLUTION & CONTROL MCQS 03
1.
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
2. '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
3. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
(A) 20
(B) 230
(C) 750
(D) 1500
Answer: Option B
4. __________ 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
5. 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
6. The main type of sludge gas evolved during sewage treatment in Imhoff tank is
(A) CO2
(B) CH4
(C) CO
D) H2
Answer: Option B
7. The upper layer of atmosph re is called the(A) 105
(B) 135
(C) 160
(D) 185
Answer: Option B
2. '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
3. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
(A) 20
(B) 230
(C) 750
(D) 1500
Answer: Option B
4. __________ 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
5. 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
6. The main type of sludge gas evolved during sewage treatment in Imhoff tank is
(A) CO2
(B) CH4
(C) CO
D) H2
Answer: Option B
(A) Stratosphere
(B) Troposphere
(C) Ionosphere
(D) None of these
Answer: Option A
8. Brown spots in fabrics will be caused by washing with water containing large amount of:
(A) Iron
(B) Zinc
(C) Iodine
(D) Bromine
Answer: Option A
9. The term Biological Oxygen Demand (BOD) is used in relation to
(A) Potable water
(B) Cooling water
(C) Distilled water
(D) Industrial effluents
Answer: Option D
10. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas air mixture), rendering it the property of the most explosive gas?
(A) Hydrogen
(B) Acetylene
(C) Carbon monoxide
(D) Ammonia
Answer: Option B
No comments:
Post a Comment