Water Pollution Test

Water Pollution

This is online test 01 for CBSE class 12 Biology Environmental Issues (Water pollution).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
The neurotoxic form of Mercury which can be directly absorbed by fishes :
  • A
    methyl mercury
    Correct
  • B
    acetyl mercury
  • C
    benzomercury
  • D
    ethyl mercury
2
Oil spills prevent oxygenation of water so they are :
  • A
    None of these
  • B
    physical pollutants
    Correct
  • C
    chemical pollutants
  • D
    biological pollutants
3
That species which is found in highest concentration within a polluted water reservoir is called :
  • A
    Pioneer species
  • B
    Index species
    Correct
  • C
    Climax species
  • D
    Fugitive species
4
Which of the following is a wrong matched pair:
  • A
    Dystrophic lake – high production
    Correct
  • B
    Acidotrophic lake – low production
  • C
    Eutrophic lake – high production
  • D
    Oligotrophic lake – low production
5
Read the following statements: i. Based on emission, there are point and diffusion sources of water pollution. ii. Fertilisers are example of point sources of water pollution. iii. Industrial discharge pipes are examples of diffusion sources of water pollution.
  • A
    all statements are correct.
  • B
    only statements i) and ii) are correct.
  • C
    only statements i) and iii) are correct.
  • D
    only statement i) is correct.
    Correct
6
Low BOD will be characteristic feature of :
  • A
    a deoxygenated water body with rich flora
  • B
    a polluted river
  • C
    an oligotrophic lake
    Correct
  • D
    a eutrophic lake
7
Water bodies and aquatic flora will be badly affected by :
  • A
    use of arrestors
  • B
    sewage treatment
  • C
    bioremediation
  • D
    acid rain
    Correct
8
Correct sequence for the amount of dissolved oxygen in water body is:
Question 8 figure 1
  • A
    mesotrophic> oligotrophic > eutrophic
  • B
    oligotrophic > eutrophic >mesotrophic
  • C
    oligotrophic >mesotrophic> eutrophic
    Correct
  • D
    eutrophic >mesotrophic> oligotrophic
9
If DDT content in the water of a lake is found to be 0.004 ppm then pelicans of that area will have:
  • A
    2 ppm of DDT
    Correct
  • B
    0.008ppm of DDT
  • C
    0.004 ppm of DDT
  • D
    0.003 ppm of DDT
10
Effects of thermal pollution of water include : a) increased BOD b) increased toxicity of discharged chemicals c) decreased microbial activity
  • A
    only a) & b) are correct.
    Correct
  • B
    only b) & c) are correct.
  • C
    only a) & c) are correct.
  • D
    only b) is correct.