set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on environmental chemistry topic of general science mcq
(a) Carbon dioxide
(b) Nitrogen oxide
(c) Sulphur dioxide
(d) Carbon monoxide
The correct answers to the above question in:
Answer: (b)
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
Which one of the following statement is not true?
a) Concentration of DO below 6 ppm is good for the growth of fish.
b) Clean water would have a BOD value of less than 5 ppm.
c) pH of drinking water should be between 5.5 – 9.5.
d) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
Answer »Answer: (a)
The ideal value of D.O for the growth of fishes is 8 mg/l.
7mg /l is a desirable range, below this value fishes get susceptible to disease.
A value of 2 mg/ l or below is lethal for fish.
Question : 2
Statement I :
Phenyl is used as a household germicide.
Statement II :
Phenyl is phenol derivative and phenol is an effective germicide.
a) Statement I is true but Statement II is false
b) Both Statement I and Statement II are true but Statement II is NOT the correct explanation of Statement I
c) Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I
d) Statement I is false but Statement II is true
Answer »Answer: (c)
Question : 3
Eutrophication causes reduction in
a) nutrients
b) dissolved salts
c) dissolved oxygen
d) All of these
Answer »Answer: (c)
Eutrophication causes reduction in D.O.
Question : 4
Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog, identify it.
a) O3
b) SO2
c) NO2
d) Unsaturated hydrocarbon
Answer »Answer: (b)
Question : 5
What is DDT among the following ?
a) A fertilizer
b) Biodegradable pollutant
c) Greenhouse gas
d) Non-biodegradable pollutant
Answer »Answer: (d)
DDT is a non-biodegradable pollutant.
Question : 6
Ozone layer in upper atmosphere (stratosphere) is destroyed by –
a) chlorofluoro carbon (CFC)
b) photochemical smog
c) hydrochloric acid
d) sulphur dioxide
Answer »Answer: (a)
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