Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of:

1. Carbon 2. Sulphur
3. Calcium 4. Phosphorus

Subtopic:  Water Pollution |
 76%
From NCERT
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Match the following and choose the correct option.

Column I Column II
A. Environment Protection Act i. 1974
B. Air prevention & Control of pollution Act ii. 1987
C. Water act iii. 1986
D. Amendment of Air Act to include noise as an air pollutant iv.  1981


The correct match is :

Options: A B C D
1. iii iv i ii
2. i iii ii iv
3. iv i ii iii
4. iii iv ii i

Subtopic:  Introduction to Pollution & Types | Air Pollution | Water Pollution |
 84%
From NCERT
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Which of the following are commonly used as a bacterial indicator of water pollution?

1. Coliforms 2. Shigella
3. Giardia 4. Salmonella

Subtopic:  Water Pollution |
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The green scum seen in the freshwater bodies is:
1. Blue-green algae
2. Red algae
3. Green algae
4. Both 1 and 3

Subtopic:  Water Pollution |
 72%
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The expanded form of DDT is:
1. Dichloro diphenyl trichloroethane
2. Dichloro diethyl trichloroethane
3. Dichloro dipyridyl trichloroethane
4. Dichloro diphenyl tetrachloroacetate

Subtopic:  Water Pollution |
 80%
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Identify the incorrectly matched pair:

1.

Ozone depletion

DNA damage

2.

Greenhouse effect

Increased atmospheric carbon dioxide

3.

Acid rain

pH < 5

4.

Eutrophication

Decreased primary productivity

Subtopic:  Ozone Layer Depletion | Water Pollution |
 64%
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Match the items in column I and column II and choose the correct option:

Column I Column II
A. UV i. Biomagnifications
B. Biodegradable organic matter ii. Eutrophication
C. DDT iii. Snow blindness
D. Phosphates iv. BOD

Options: A B C D
1. ii i iv iii
2. iii ii iv i
3. iii iv i ii
4. iii i iv ii

Subtopic:  Ozone Layer Depletion | Water Pollution |
 91%
From NCERT
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Which one of the following diseases is not caused due to contamination of water?

1. Hepatitis-B 2. Jaundice
3. Cholera 4. Typhoid

Subtopic:  Water Pollution |
 87%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The presence of Tubifex in a water sample is a good indicator of high quality [non-polluted] of the water sample.
Reason (R): Tubifex is a nematode that cannot survive in water with low dissolved oxygen content.
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Water Pollution |
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The world’s most problematic aquatic weed is:

1.  Azolla                2.  Wolffia
3. Eichhornia 4. Trapa

Subtopic:  Water Pollution |
 95%
From NCERT
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