Water Pollution Test

Water Pollution

This is online test 02 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
In polluted water body : i. Species diversity is low. ii. High species diversity is indication of pollution.
  • A
    Statement i) is correct but ii) is wrong
    Correct
  • B
    Statement ii) is correct but i) is wrong
  • C
    both the statements are wrong
  • D
    both the statements are correct
2
Deoxygenation of water causes : i. conversion of eutrophic water body back into oligotrophic. ii. growth of anaerobic microbes producing secondary pollutants like \({H_{\mathbf{2}}}S\).
  • A
    Statement i) is correct but ii) is wrong
  • B
    both the statements are wrong
  • C
    Statement ii) is correct but i) is wrong
    Correct
  • D
    both the statements are correct
3
Huge quantity of sewage is dumped in a river, the BOD will
  • A
    Slightly decrease
  • B
    Decrease
  • C
    Increase
    Correct
  • D
    Remain unchanged
4
Domestic waste is
  • A
    Effluent
  • B
    Air pollutant
  • C
    Biodegradable
    Correct
  • D
    Non-biodegradable
5
Acid rain is due to
  • A
    Automobile pollution
  • B
    Pesticide pollution
  • C
    Air pollution
    Correct
  • D
    Water pollution
6
Eutrophication of water body occurs due to addition of
  • A
    Only sewage
  • B
    Detergents, fertilizers and sewage.
    Correct
  • C
    Only detergents
  • D
    Only fertilizers
7
Terrestrial life would become impossible with
  • A
    Change in orbit of earth
  • B
    Disappearance of moon
  • C
    Decrease in mean annual temperature by 100 C.
  • D
    Change in atmosphere permitting all solar radiations to reach lithosphere
    Correct
8
Minamata disease is due to pollution of
  • A
    Oil spill in water
  • B
    Industrial waste mercury into fishing water.
    Correct
  • C
    Organic waste into drinking water.
  • D
    Arsenic into the atmosphere
9
Addition of phosphates and nitrates/fertilizers into water leads to
  • A
    Increased algal growth
  • B
    Reduced algal growth
  • C
    Nutrient enrichment /eutrophication.
    Correct
  • D
    Increased growth of decomposers
10
In pollution, the term synergism is used for
  • A
    Decreasing effect to degradable pollutant.
  • B
    Formation of more potent secondary pollutant from primary pollutant.
    Correct
  • C
    Biomagnifications of non-biodegradable pollutants.
  • D
    Dangerous effect when two pollutants are present together.