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) nutrients
(b) dissolved salts
(c) dissolved oxygen
(d) All of these
The correct answers to the above question in:
Answer: (c)
Eutrophication causes reduction in D.O.
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
Minimata disease is a pollution-related disease, which results from –
a) accumulation of arsenic into atmosphere
b) release of industrial waste mercury into fishing water
c) release of human organic waste into drinking water
d) oil spills into sea
Answer »Answer: (b)
Question : 2
Which of the following is not a synthetic fibre:
a) Nylon
b) Rayon
c) Angora
d) Polyester
Answer »Answer: (c)
Question : 3
Which of the following chemicals is used in foam fire extinguishers? [NDA]
a) Cobalt sulphate
b) Copper sulphate
c) Aluminium sulphate
d) Nickel sulphate
Answer »Answer: (c)
Question : 4
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 : 5
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 : 6
Which one of the following is associated with the formation of brown air in traffic congested cities?
a) Carbon dioxide
b) Nitrogen oxide
c) Sulphur dioxide
d) Carbon monoxide
Answer »Answer: (b)
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