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) oxygen deficiency
(b) excessive nutrient availability
(c) nutrient deficiency
(d) absence of herbivores in the lake
The correct answers to the above question in:
Answer: (a)
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
Consider the following statements:
- Use of fertilizers has role on water pollution
- Excessive use of pesticides help to decrease water pollution.
a) 2 only
b) 1 only
c) 1 and 2
d) None
Answer »Answer: (a)
Question : 2
Acid rains is caused due to emission of which of the following into the atmosphere?
a) Carbon dioxide and carbon monoxide
b) Oxides of nitrogen and sulphur
c) Ozone and carbon dioxide
d) Carbon monoxide and nitrogen
Answer »Answer: (b)
Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
Question : 3
Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.
a) poor in dissolved oxygen
b) highly polluted
c) rich in dissolved oxygen
d) not suitable for aquatic life
Answer »Answer: (c)
Question : 4
Statement I :
Coal-based thermal power stations contribute to acid-rain.
Statement II :
Oxides of carbon are emitted when coal burns.
a) Statement I is true but Statement II is false
b) Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I
c) Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I
d) Statement I is false but Statement II is true
Answer »Answer: (b)
Question : 5
Eutrophication causes reduction in
a) nutrients
b) dissolved oxygen
c) dissolved salts
d) All the above
Answer »Answer: (b)
Eutrophication causes reduction in D.O.
Question : 6
The greenhouse effect is because of the
a) presence of CO2 only in the atmosphere
b) pressure of O3 and CH4 in the atmosphere
c) presence of gases, which in general are strong infrared absorbers, in the atmosphere
d) N2O and chlorofluorohydrocarbons in the atmosphere
Answer »Answer: (c)
Greenhouse gases such as CO2, ozone, methane, chlorofluorocarbon compounds and water vapour from a thick cover around the earth prevent the IR rays emitted by the earth to escape.
It gradually leads to an increase in the temperature of the atmosphere.
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