Soil conservation is the process where

(1) Soil is aerated

(2) Soil erosion is allowed

(3) Soil is protected against loss

(4) Sterile soil is converted into fertile soil

Subtopic:  Soil Pollution & Waste Management |
 78%
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Which of the following is not a greenhouse gas :-

(1) Hydrogen

(2) Carbon dioxide

(3) Methane

(4) Nitrous oxide or N2O

Subtopic:  Air Pollution - Greenhouse Effect |
 90%
From NCERT
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The concentration of Peroxy Acetyl Nitrate (PAN) maximum in:-

(1) Fog

(2) Smoke

(3) Smog

(4) Photochemical smog

Subtopic:  Air Pollution - Smog |
 86%
From NCERT
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Soil erosion is greater when

(1) No rain occurs

(2) Winds do not blow

(3) The rainfall is evenly distributed

(4) The Rainfall is received in heavy down pour

Subtopic:  Soil Pollution & Waste Management |
 87%
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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

(4) SO2 and NO2

Subtopic:  Air Pollution - Acid Rain |
 95%
From NCERT
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B.O.D is connected with-

1. Organic matter

2. Microbes

3. Both (1) and (2) 

4. None of the above.

Subtopic:  Water Pollution - Biological Oxygen Demand |
 83%
From NCERT
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SO2 pollution is indicated by

(1) Grasses

(2) Mosses

(3) Lichens

(4) Fossils

Subtopic:  Air Pollution - Smog |
 93%
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The most hazardous metal pollutant of automobile exhaust is : 

1. Hg

2. Cd

3. Pb

4. Cu

Subtopic:  Air Pollution - Global Warming |
 72%
From NCERT
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The common nitrogen-fixer in paddy fields is
1. Azospirillum

2. Oscillatoria

3. Frankia

4. Rhizobium

Subtopic:  Microbes as Biofertilizer |
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Ozone layer of upper atmosphere is being destroyed by

(1) Sulphur dioxide

(2) Carbon dioxide

(3) Chlorofluorocarbon

(4) Smog

Subtopic:  Air Pollution - Greenhouse Effect |
 94%
From NCERT
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