Prelims MCQs Quiz 44 : Environment


1. The non-point pollution of river water involves discharge of pollutants through
a) urban sewage drains
b) industrial effluents
c) agricultural fields
d) both (a) and (b)

Answer & Explanation

2. Man causes soil erosion through
1. use of improper ploughing methods.
2. leaving roots of crop in the field after harvest.
3. practicing trash farming.
4. use of heavy machines.
Select the correct answer using the codes given below.
a) 1, 2 and 3 only
b) 1 and 4 only
c) 1, 3 and 4 only
d) 1, 2, 3 and 4 only

Answer & Explanation

3. Which of the following evidences support the theory of gradual rise in air temperature and consequent global warming?
1. spreading of tropical diseases towards temperate regions.
2. downward shifting of snow lines of tropical mountains.
3. freezing of permafrost areas.
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 2 and 3 only
d) 1 and 3 only

Answer & Explanation

4. Biofuels are fuels extracted from plants and crops and these have various advantages. These include
1. increasing agricultural diversity.
2. reduced use of fertilizers.
3. renewable source of energy.
Select the correct answer using the codes given below.
a) 1 and 3 only
b) 3 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

5. The sources of mercury pollution include
1. coal fired thermal power plants.
2. supersonic jets.
3. automobiles.
4. waste incinerators
Select the correct answer using the codes given below.
a) 1, 2 and 3 only
b) 1, 3 and 4 only
c) 1 and 3 only
d) 1 and 4 only

Answer & Explanation

6. A balanced ecosystem is one in which the
1. number of organisms at all levels is equal.
2. amount of biomass at all trophic levels is equal.
3. organisms are interdependent on each other.
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 2 only
c) 3 only
d) none

Answer & Explanation

7. With to the IUCN classification, extinct species are those which have been:
1. completely eliminated from wild areas.
2. completely eliminated from managed areas.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

8. The Great Indian Bustard is a critically endangered species. Its population has been declining due to
1. habitat loss
2. frequent poaching
3. construction of windmills
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 2 only
d) 1, 2 and 3

Answer & Explanation

9. With reference to Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), consider the following statements:
1. BOD is a measurement of consumed oxygen by aquatic microorganisms to decompose organic matter.
2. COD refers to the requirement of dissolved oxygen for the oxidation of organic constituents.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

10. Fertlizers are added to supply mainly three nutrients – Nitrogne (N), Phosphorous (P) and Potassium (K). Biofertlizers can supply which of these nutrients?
1. Nitrogen
2. Phosphorous
3. Potassium
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 1 and 3 only
d) 1, 2 and 3

 

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Please read these important articles about prelims preparation

1. How UPSC asks current affairs in GS Prelims

2. How to practice prelims MCQs for UPSC

3. Applying logic in UPSC General Studies Prelims

 

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