ENVIRONMENTAL POLLUTION & CONTROL MCQS 09

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 09

1. 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) 50
Answer: Option A
2. The maximum CO2 is emitted into the atmosphere by
(A) Combustion
(B) Urea
(C) Biomass burning
(D) Trees
Answer: Option A
3. Workers working in __________ industry are most prone to white lung cancer.
(A) Coal mining
(B) Limestone mining
(C) Textile
(D) Asbestos
Answer: Option C
4. Which of the following processes is involved in the biochemical treatment of sewage effluents?
(A) Oxidation
(B) Reduction
(C) Dehydration
(D) Fermentation
Answer: Option A
5. Which of the following is a manmade source of air pollution?
(A) Automobile exhaust
(B) Forest fire
(C) Bacterial action in soil and swamp areas
(D) All (A), (B) and (C)
Answer: Option A
6. The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.
(A) 10
(B) 200
(C) 1000
(D) 2000
Answer: Option B
7. 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: Option B
8. TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes
(A) Skin disorder
(B) Bronchitis
(C) Bone disease
(D) Cancer
Answer: Option B
9. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
(A) CO2
(B) SO2
(C) Hydrocarbons
(D) CFC (chloro fluoro carbon)
Answer: Option D
10. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
(A) Ionosphere
(B) Troposphere
(C) Stratosphere
(D) None of these
Answer: Option B