Which is the greatest air pollutant these days

(1) Factories

(2) Motor vehicles

(3) Domestic appliances

(4) animals

Subtopic:  Air Pollution - Smog |
 77%
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Removal of the soil by the action of wind and water is known as

(1) Erosion

(2) Fossilization

(3) Leaching

(4) Calcification

Subtopic:  Soil Pollution & Waste Management |
 91%
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Acid rain occurs due to the presence of : 

1. SO2 in the atmosphere

2. NH3  in the atmosphere

3. CO2  in the atmosphere

4. N2O  in the atmosphere

Subtopic:  Air Pollution - Acid Rain |
 92%
From NCERT
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Photochemical smog was first observed in -

(1) London

(2) Los Angeles

(3) Paris

(4) Tokyo

Subtopic:  Air Pollution - Smog |
 65%
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An increase in CO2 concentration in the atmosphere will result in : 

1. Adverse effects on natural vegetation.

2. Global warming.

3. Temperature decrease in a global atmosphere.

4. Genetic disorders in plants and animals.

Subtopic:  Air Pollution - Global Warming |
 92%
From NCERT
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Domestic waste will lead to -

(1) Biodegradable pollution

(2) Nondegradable pollution

(3) Thermal pollution of soil

(4) Air pollution

Subtopic:  Soil Pollution & Waste Management |
 87%
From NCERT
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The major source of BOD in the river Ganga is 

(1) Leaf litter

(2) Fishes

(3) Human waste

(4) Aquatic plants

Subtopic:  Water Pollution - Biological Oxygen Demand |
 89%
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If a lake is contaminated with DDT, its highest concentration would be found in

(1) Primary consumer

(2) Secondary consumer

(3) Tertiary consumer

(4) None of these

Subtopic:  Water Pollution - Water Pollution & Portable Water |
 87%
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The most harmful air pollutant produced by automobiles is- 

1. HNO2

2. NO

3. SO2

4. CO

Subtopic:  Air Pollution - Global Warming |
 63%
From NCERT
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Sewage water can be purified by

(1) Aquatic plant

(2) Microorganism

(3) Penicillin

(4) Fishes

Subtopic:  Water Pollution - Water Pollution & Portable Water |
 89%
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