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 |
 69%
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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 |
 61%
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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 |
 53%
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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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The common nitrogen-fixer in paddy fields is
1. Azospirillum

2. Oscillatoria

3. Frankia

4. Rhizobium

Subtopic:  Microbes as Biofertilizer |
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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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SO2 pollution is indicated by

(1) Grasses

(2) Mosses

(3) Lichens

(4) Fossils

Subtopic:  Air Pollution - Smog |
 93%
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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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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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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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