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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Which of the following is absent in polluted water

1. Hydrilla

2. Water hyacinth

3. Larva of stone fly

4. Blue green algae

Subtopic:  Water Pollution - Biological Oxygen Demand |
 52%
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Maximum green house gas released by which country

(1) India

(2) China

(3) U.S.A

(4) Britain

Subtopic:  Air Pollution - Greenhouse Effect |
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The ozone layer of the upper atmosphere is being destroyed by : 

1. Sulphur dioxide

2. Carbon dioxide

3. Chlorofluorocarbon

4. Smog

Subtopic:  Air Pollution - Greenhouse Effect |
 93%
From NCERT
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Most hazardous metal pollutant of automobile exhaust is

(1) Hg

(2) Cd

(3) Pb

(4) Cu

Subtopic:  Air Pollution - Global Warming |
 73%
From NCERT
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SO2 pollution is indicated by

1. Grasses

2. Mosses

3. Lichens

4. Fossils

Subtopic:  Air Pollution - Smog |
 87%
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B.O.D is connected with

(1) Organic matter

(2) Microbes

(3) Both

(4) None

Subtopic:  Water Pollution - Biological Oxygen Demand |
 76%
From NCERT
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Acid rain is due to an increase in the atmospheric concentration of : 

1. Ozone, and dust

2. CO2, and CO

3. SO3, and CO

SO2, and NO2

Subtopic:  Air Pollution - Acid Rain |
 92%
From NCERT
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