ENVIRONMENTAL POLLUTION & CONTROL MCQS 28

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 28

1. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
(A) 50
(B) 1000
 (C) 2000
(D) 5000
Answer: Option D

2. Higher concentration of CO2 in atmosphere
(A) Allows visible solar radiation (ultraviolet) of short wave-length to pass through
(B) Reflects and absorbs the longer wavelength (infra-red) radiations
(C) Prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming
(D) All (A), (B) and (C)
Answer: Option D

3. Dissolved oxygen content in river water is around __________ ppm.
(A) 5
(B) 100
(C) 250
(D) 500
Answer: Option A

4. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
(A) Blood poisoning
(B) Anaemia
(C) Nervous system disorder
(D) All (A), (B) & (C)
Answer: Option D

5. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as
(A) Photochemical smog
(B) Peroxyacetyl nitrate (PAN) or methyl nitrite
(C) Benzopyrene
(D) Polyacrylonitrile
Answer: Option B
6. Maximum permissible turbidity in potable water is __________ ppm.
(A) 1
(B) 10
(C) 250
(D) 1000
Answer: Option B

7. Presence of excess fluorine in water causes
(A) Dental cavity
(B) Tooth decay
(C) Fluorosis
(D) Respiratory disease
Answer: Option C

8. TLV of aldrin in public water supply system is about __________ μg/litre.
(A) 0.5
B) 17
(C) 357
(D) 1097
Answer: Option B

9. H2S present in gaseous stream can be removed by adsorption on
(A) Silica gel
(B) Active carbon
(C) Bog iron
(D) Limestone powder
Answer: Option C

10. Aerobic biological oxidation ponds used for the purification of polluted water
(A) Destroys/removes pathogen from the sewage
(B) Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
(C) Destroys/removes pathogen much more effectively if the sewage is chlorinated
(D) All (A), (B) & (C)
Answer: Option D