The phenomenon in which atmospheric gases trap the heat radiations from the sun near the earth’s surface and keeps it warm is known as-

1. Natural greenhouse effect

2. Tyndall effect

3. Heating effect

4. Joule’s effect

Subtopic:  Air Pollution - Greenhouse Effect |
 92%
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CO gas is more dangerous than CO2 gas because : 

1. CO is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is more stable than the oxygen-haemoglobin complex. 

2. CO is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is less stable than the oxygen-haemoglobin complex. 

3. CO2 is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is more stable than the oxygen-haemoglobin complex. 

4. CO2 is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is less stable than the oxygen-haemoglobin complex. 

Subtopic:  Air Pollution - Greenhouse Effect |
 91%
From NCERT
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Gases responsible for greenhouse effect are : 
1. Carbon dioxide (CO2)
2. Ozone (O3)
3. Nitrous oxide (N2O)
4. All of the above.

Subtopic:  Air Pollution - Greenhouse Effect |
 90%
From NCERT
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... is not a greenhouse gas :-
1. Hydrogen
2. Carbon dioxide
3. Methane
4. Nitrous oxide or N2O

Subtopic:  Air Pollution - Greenhouse Effect |
 89%
From NCERT
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In the absence of greenhouse gases -

1. Life on earth would be impossible.
2. Average temperature of the earth will decrease drastically.
3. There will be no effect on Earth
4. Both (1) and (2)

Subtopic:  Air Pollution - Greenhouse Effect |
 84%
From NCERT
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Among the following gases, the one that is not a greenhouse gas is :

1. CO

2. O3 

3. CH4

4. H2O vapor

Subtopic:  Air Pollution - Greenhouse Effect |
 59%
From NCERT
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