Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): There is always a sharp decline in dissolved oxygen downstream from the point of sewage discharge, which causes mortality of fish and other aquatic creatures
Reason (R): Micro-organisms involved in bio-degradation of organic matter in the receiving water body consume a lot of oxygen
In the light of the above statements, choose the correct 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. (A) is False but (R) is True.
Subtopic:  Water Pollution |
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The thickness of ozone in a column of air in the atmosphere is measured in terms of :
1.Kilobase 2.Dobson unit 
3.Decibels 4.Decameter
Subtopic:  Ozone Layer Depletion |
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Which one of the following statements is not correct?
 
1. The amount of some toxic substances of industrial wastewater increases in the organisms at successive trophic levels. 
2. The micro-organisms involved in biodegradation of organic matter in a sewage-polluted water body consume aquatic organisms.
3. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries.
4. Water hyacinth grows abundantly in eutrophic water bodies and lead to an imbalance in the ecosystem dynamics of the water body.
Subtopic:  Water Pollution |
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Given below are two statements:

I: Electrostatic precipitator is most widely used in a thermal power plant.
II: Electrostatic precipitator in a thermal power plant removes ionising radiations.
 
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic:  Air Pollution |
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Which of the following statements is correct?
 
1. Algal Bloom decreases fish mortality.
2. Eutrophication refers to increase in domestic sewage and waste water in lakes.
3. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.
4. Presence of large amounts of nutrients in water restricts 'Algal Bloom'.
Subtopic:  Water Pollution |
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Nitrates and phosphates flowing from agricultural farms into water bodies are a significant cause of:
1.Eutrophication2.Humification
3.Mineralisation4.Stratification
Subtopic:  Water Pollution |
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What will happen if fresh water lake gets contaminated by the addition of polluted water with high BOD?
1. Amount of dissolved oxygen in the lake will decrease.
2. The lake will remain unaffected
3. Number of submerged aquatic plants in the lake will increase
4. Number of aquatic animals in the lake will increase.
Subtopic:  Water Pollution |
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Match List - I with List - II
List-I List-II
(A) Deforestation (I) Responsible for heating of Earth's surface and atmosphere
(B) Reforesation (II) Conversion of forested areas to non-forested areas
(C) Green-house effect (III) Natural ageing of lake by nutrient enrichment of its water
(D) Eutrophication (IV) Process of restoring a forest that once existed but was removed
Choose the correct answer from the options given below:
Options: (A) (B) (C) (D)
1. IV III II I
2. I II III IV
3. III I II IV
4. II IV I III
Subtopic:  Green House Effect & Global Warming | Resource Utilisation & Maintenance | Water Pollution |
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Select the correct statements regarding dissolved Oxygen and Biochemical Oxygen demand.
A: BOD is inversely related to dissolved oxygen
B: Low dissolved oxygen and high BOD lead to loss of aquatic life.
C: High BOD leads to high dissolved oxygen
D: Both BOD and dissolved oxygen are indicator of health of a water body
E: Both BOD and dissolved oxygen are affected by amount of organic matter in the water body.
Choose the most appropriate answer from the options given below:
1. (A), (B), (C), (E) only 2. (A), (B), (D), (E) only
3. (A), (B), (C), (D) only 4. (B), (C), (D), (E) only
Subtopic:  Water Pollution |
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The device which can remove particulate matter present in the exhaust from a thermal power plant is : 
1. Catalytic Convertor
2. STP
3. Incinerator
4. Electrostatic Precipitator

Subtopic:  Air Pollution |
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