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Environmental Science MCQ Questions and answers | EVS MCQ

Learn and practice General Knowledge questions and answers on Environmental Science MCQ with very easy and understandable explanations. EVS MCQ questions are very helpful different type of competitive ex Page-4 section-6

Each section contains 100 MCQs on Environmental Science .
31
Acid rain contains
Discuss
Answer & Solution
Answer: Option A
Solution:
Acid rain contains Sulphuric acid.
32
Water from springs contain dissolved __________ compounds which are used to cure some skin diseases.
Discuss
Answer & Solution
Answer: Option D
Solution:
Water from springs contain dissolved Sulphur compounds which are used to cure some skin diseases.
33
Which of the following is considered a variable gas in the earth's atmosphere?
Discuss
Answer & Solution
Answer: Option A
Solution:
Water vapour is considered a variable gas in the earth's atmosphere.
34
The limitating factor in temperate and boreal forest is
Discuss
Answer & Solution
Answer: Option D
Solution:
Due to the older age and species diversity of the temperate forest ecosystems, many grasses and lower lying shrubs have difficulty growing to the breadth of the canopy composed of the taller trees. As a result, little sunlight actually reaches the forest floor, which serves as its own limiting factor.
35
Eutrophication of water bodies resulting to killing of fishes is mainly due to non-availability of
Discuss
Answer & Solution
Answer: Option C
Solution:
The concentration of the oxygen would fall and this causes the death of the aquatic animals due to the suffocation. Hence, the correct answer is 'non-availability of oxygen'.
36
The ozone at ground level is primarily from __________ precursors.
Discuss
Answer & Solution
Answer: Option A
Solution:
The ozone at ground level is primarily from fossil fuel precursors.
37
Gas released during photosynthesis is
Discuss
Answer & Solution
Answer: Option C
Solution:
Oxygen is released during the process of photosynthesis.
38
The earth's first atmosphere was composed primarily of:
Discuss
Answer & Solution
Answer: Option B
Solution:
At its initial formation, the Earth's first atmosphere was composed primarily of the light elements hydrogen and helium.
39
Which gas is likely to be reduced in the atmosphere by deforestation?
Discuss
Answer & Solution
Answer: Option C
Solution:
Oxygen is the gas which is likely to be reduced in the atmosphere by deforestation. One of the most dangerous threats to life on earth is the increase in pollution which is caused because of the increase in the concentration of carbon dioxide and carbon monoxide in the environment.
40
In a volume of air near the earth's surface, ____ occupies 78 percent and ____ nearly 21 percent.
Discuss
Answer & Solution
Answer: Option A
Solution:
In a volume of air near the earth's surface, nitrogen occupies 78 percent and oxygen nearly 21 percent.