ENVIRONMENTAL POLLUTION & CONTROL MCQS 12

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 12

1. Pick out the wrong statement.
(A) Biological oxygen demand (BOD) is a characteristic and not a constituent of water
(B) BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism
(C) BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)
(D) None of these
Answer: Option D
2. A man exposed to excessive noise level in the working environment may suffer from
(A) Hearing loss
(B) Rupture of ear drum
(C) Nervousness & fatigue
(D) All (A), (B) & (C)
Answer: Option D
3. Presence of nitrates in water in excess of 50 ppm causes
(A) Methemoglobinemia
(B) Gastroenteritis
(C) Asphyxiation
(D) Tooth decay
Answer: Option A
4. Which is the most widely used coagulant for the treatment of turbid water?
(A) Alum (aluminium sulphate)
(B) Lime
(C) Ferric chloride
(D) Sodium aluminate
Answer: Option A
5. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
(A) Low amount of excess combustion air
(B) Large quantity of excess combustion air
(C) Hydrocarbon fuel
(D) Pulverised coal as fuel
Answer: Option A
6. Higher concentration of nitrogen dioxide in atmospheric air causes
(A) Cancer
(B) Bronchitis
(C) Asphyxiation
(D) Corrosion
Answer: Option B
7. Biological oxidation ponds remove organic matters present in the polluted water by
(A) Using the activities of bacteria and other micro organisms
(B) Aerobic oxidation
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Answer: Option C
8. Exposure to SO2 containing chimney gases results in the
(A) Reduction in strength of leather & cloth
(B) Acceleration of corrosion rates of metals
(C) Increased drying & hardening time of paints
(D) All (A), (B) and (C)
Answer: Option D
9. Pick out the correct statement.
(A) Deforestation helps in controlling the green house effect
(B) Global warming is detrimental for increase in food productivity and may cause flood and cyclone
(C) Lightening discharges are natural source of production of SO2 & H2S pollutant
(D) Sulphur dioxide causes death by asphyxiation
Answer: Option B
10. The principal gas evolved from sludge digestion tank is
(A) CO
(B) CO2
(C) CH4
(D) N2
Answer: Option C