Photochemical smog was first observed in -

(1) London

(2) Los Angeles

(3) Paris

(4) Tokyo

Subtopic:  Air Pollution - Smog |
 62%
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An increase in CO2 concentration in the atmosphere will result in

(1) Adverse effects of natural vegetation

(2) Global warming

(3) Temperature decrease in a global atmosphere

(4) Genetic disorders in plants and animals

Subtopic:  Air Pollution - Global Warming |
 93%
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 |
 83%
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 |
 85%
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If a lake is contaminated with DDT, it's highest concentration would be found in :

1. Primary consumer

2. Secondary consumer

3. Tertiary consumer

4. None of the above.

Subtopic:  Water Pollution - Water Pollution & Portable Water |
 81%
From NCERT
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The most harmful air pollutant produced by automobiles is:

1. HNO2

2. NOX

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 |
 85%
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Major pollutant in Jet plane emission is -

(1) SO2

(2) CFC

(3) CO

(4) CCl4

Subtopic:  Air Pollution - Greenhouse Effect |
 60%
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B.O.D is-

1. The amount of O2 utilized by organisms in the water. 
2. The amount of O2 utilized by microorganisms for decomposition.
3. The total amount of O2  present in water.
4. All of the above

Subtopic:  Water Pollution - Biological Oxygen Demand |
 68%
From NCERT
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What is the intensity of sound in normal conversation 

1. 10 -20 decibal

2. 30 - 60 decibal

3. 70 - 90 decibal

4. 120 - 150 decibal

Subtopic:  Introduction |
 60%
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