ENVIRONMENTAL POLLUTION & CONTROL MCQS 08

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 08

1. Global warming may result in
(A) Flood
(B) Cyclone
(C) Decrease in food productivity
(D) All (A), (B) and (C)
Answer: Option D
2. Maximum permissible residual chlorine in treated water should be __________ mg/litre.
(A) 0.001 to 0.01
(B) 0.2 to 0.3
(C) 2 to 3
(D) 5 to 10
Answer: Option B
3. Ringelmann chart No. 2 corresponds to __________ percent black smoke.
(A) 10
(B) 20
(C) 40
(D) 80
Answer: Option C
4. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
(A) 60
(B) 90
(C) 105
(D) 120
Answer: Option B
5. 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
Answer: Option A
6. 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
Answer: Option D
7. 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
Answer: Option C
8. Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
(A) 10 to 20
(B) 100 to 200
(C) 1500 to 2500
(D) 4000 to 5000
Answer: Option B
9. __________ content of the phosphate rock is the pollutant of primary interest in a
phosphatic fertiliser plant.
(A) Calcium
(B) Fluorine
(C) Phosphorous
(D) Sulphur
Answer: Option B
10. Color test of water is done with an instrument called
(A) Tintometer
(B) Colorimeter
(C) Electro-chemical cell
(D) Turbidimeter
Answer: Option A