Practice Test: Question Set - 06
1. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by
- (A) Chemical coagulation
- (B) Floatation & skimming
- (C) Centrifugation
- (D) Ultra filtration
2. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
- (A) Cesspool
- (B) Lagoon
- (C) Skimming mill
- (D) Septic tank
3. Pick out the wrong statement
- (A) Low ozone layer thickness in polar regions is due to cold climatic
conditions
- (B) Amount of unburnt hydrocarbons emitted by two stroke petrol engine
is more as compared to that emitted by a four stroke engine
- (C) Carbon monoxide present in the two stroke petrol engine exhaust is
much less as compared to that emitted from a four stroke engine
- (D) Mercury as a pollutant can enter the blood stream & the
digestive system/ lungs and is responsible for causing Minamata disease
4. Water filtration rate in a slow sand filter ranges from __________ liters/m2/hr.
- (A) 10 to 20
- (B) 100 to 200
- (C) 1500 to 2500
- (D) 4000 to 5000
5. __________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertilizer plant.
- (A) Calcium
- (B) Fluorine
- (C) Phosphorous
- (D) Sulphur
6. Color test of water is done with an instrument called
- (A) Tintometer
- (B) Colorimeter
- (C) Electro-chemical cell
- (D) Turbidimeter
7. 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
8. The maximum CO2 is emitted into the atmosphere by
- (A) Combustion
- (B) Urea
- (C) Biomass burning
- (D) Trees
9. Workers working in __________ industry are most prone to white lung cancer.
- (A) Coal mining
- (B) Limestone mining
- (C) Textile
- (D) Asbestos
10. Which of the following processes is involved in the biochemical treatment of sewage effluents?
- (A) Oxidation
- (B) Reduction
- (C) Dehydration
- (D) Fermentation
11. 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)
12. The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.
- (A) 10
- (B) 200
- (C) 1000
- (D) 2000
13. 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
14. 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
15. 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)
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