Environmental Issues

Q1 FREE PREVIEW

PYQ

A river with an inflow of domestic sewage rich in organic waste may result in:

aIncreased population of aquatic food web organisms

bAn increased production of fish due to biodegradable nutrients

cDeath of fish due to lack of oxygen

dDrying of the river very soon due to algal bloom

✓ Correct answer: c) Death of fish due to lack of oxygen

ExplanationWhen domestic sewage rich in organic waste enters a river, it increases the biochemical oxygen demand (BOD) due to microbial decomposition.This leads to oxygen depletion in water, thus causing the death of fish and other aquatic organisms due to a lack of dissolved oxygen.Hence, the correct answer is option C.

Q2

PYQ

Dobson units are used to measure thickness of:

[NEET 2021]

a

CFCs

b

Stratosphere

c

Ozone

d

Troposphere

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Q3

PYQ

Given below are two statements:
Statement I : Electrostatic precipitator is most widely used in thermal power plant.
Statement II : Electrostatic precipitator in thermal power plant removes ionising radiations
In the light of the above statements, choose the most appropriate answer from the options given below :

[NEET 2023]

a

Both Statement I and Statement II are incorrect.

b

Statement I is correct but Statement II is incorrect.

c

Statement I incorrect but Statement II is correct.

d

Both Statement I and Statement II are correct.

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Q4

PYQ

Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants

[Re-NEET 2020]

a

Particulates of size 2.5 micrometer or below

b

Vehicular exhaust

c

Allergy causing pollen

d

Noise

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Q5

PYQ

The thickness of ozone in a column of air in the atmosphere is measured in terms of

[NEET 2023]

a

Decibels

b

Decameter

c

Kilobase

d

Dobson units

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Q6

PYQ

Which one of the following statements is NOT correct?

[NEET 2023]

a

Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries.

b

Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body.

c

The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels.

d

The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot oxygen causing the death of aquatic organisms.

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Q7

PYQ

According to Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health?

[Re-NEET 2020]

a

3.0 micrometers

b

3.5 micrometers

c

2.5 micrometers

d

4.0 micrometers

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Q8

PYQ

Snow-blindness in Antarctic region is due to

[NEET 2020]

a

High reflection of light from snow

b

Damage to retina caused by infra-red rays

c

Freezing of fluids in the eye by low temperature

d

Inflammation of cornea due to high dose of UV-B radiation

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Q9

PYQ

The thickness of ozone in a column of air in the atmosphere is measured in terms of

a

Decibels

b

Decameter

c

Kilobase

d

Dobson units

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Q10

PYQ

Which of the following statements is correct ?

[NEET 2023]

a

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.

b

Presence of large amount of nutrients in water restricts 'Algal Bloom'

c

Algal Bloom decreases fish mortality

d

Eutrophication refers to increase in domestic sewage and waste water in lakes.

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