ENVIRONMENTAL POLLUTION & CONTROL MCQS 06

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 06

 

1. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
(A) 5
(B) 50
(C) 500
(D) 5000
Answer: Option A
 
2. Carcinogenic air pollutants cause
(A) Bone decay
(B) Cancer
(C) Asphyxiation (suffocation)
(D) Anemia
Answer: Option B
 
3. Fresh sewage is __________ in nature.
(A) Acidic
(B) Neutral
(C) Alkaline
(D) Highly acidic
Answer: Option C
 
4. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
(A) Chlorine
(B) Alkalis
(C) Benzene hexachloride
(D) Alkyl benzene sulphonate (ABS)
Answer: Option A
 
5. __________ is the process of killing organism in water.
(A) Coagulation
(B) Sterilisation
(C) Disinfection
(D) Sedimentation
Answer: Option C
 
6. The lowest layer of atmosphere is known as the
(A) Stratosphere
(B) Troposphere
(C) Ionosphere
(D) None of these
Answer: Option B
 
7. Salt content in sea water is about __________ percent.
(A) 0.5
(B) 1
(C) 3.5
(D) 9.05
Answer: Option C
 
8. Inhalation of silica dust by human being causes
(A) Asphyxiation
(B) Shortness of breath
(C) Tuberculosis
(D) Both (B) & (C)
Answer: Option D
 
9. High noise levels produced during operation of fans and compressors can be reduced by using
(A) Mufflers (silencers)
(B) Acoustic absorbent
(C) Lagging of noisy duct
(D) None of these
Answer: Option A
 
10. Photochemical smog is formed from automobile exhaust
(A) By reaction of hydrocarbon & nitric oxide in presence of sunlight
(B) Appears only on sunny days
(C) Is harmful for crops and trees also besides causing eye irritation & asthma
(D) All (A), (B) & (C)
Answer: Option D