ENVIRONMENTAL POLLUTION & CONTROL MCQS 27

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 27

1. Noise level during normal conversation among men is about __________ decibels.
(A) 10
(B) 45
(C) 90
(D) 115
Answer: Option B

2. Exposure to chemicals having carcinogenic properties cause
(A) Dermatitis (skin disorder)
(B) Cancer
(C) Asphyxiation (suffocation)
(D) Asthma
Answer: Option B
 

3. Ionisation potential employed in the industrial electrostatic precipitator is of the order of
(A) 30 to 70 kV DC
(B) 30 to 70 kV AC
(C) 230 V AC
(D) 230 V DC
Answer: Option A

4. World's worst radioactive pollution was caused by nuclear reactor disaster which occurred in
(A) Arizona (U.S.A.)
(B) Chernobyl (undivided U.S.S.R.)
(C) Pennsylvania (U.S.A.)
(D) Moscow (U.S.S.R.)
Answer: Option B

5. Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
(A) Chlorination
(B) Treating in biological oxygen pond
(C) Chemical coagulation
(D) None of these
Answer: Option B

6. High noise level in a chemical plant can be controlled by the
(A) Suppression of noise at the source itself
(B) Path control of noise
(C) Protection of operating personnel
(D) All (A), (B) & (C)
Answer: Option D

7. Industrial workers working in leather tanning & manufacturing units are prone to suffer from
(A) Respiratory ailments (e.g. bronchitis)
(B) Skin diseases (e.g. dermatitis)
(C) Silicosis
(D) Blurred vision
Answer: Option B
8. 80% less than 200 mesh size particles are called
(A) Smoke
(B) Powder
(C) Grit
(D) Aggregates
Answer: Option B

9. __________ substances present in sewage are removed in grit chamber during sewage treatment.
(A) Organic
(B) Fatty
(C) Inorganic
(D) Dissolved
Answer: Option C

10. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?
(A) NOx
(B) Hg
(C) SO2
(D) F
Answer: Option C