CNG is better than diesel as a fuel for automobiles. This would be most strongly supported by which of the following statements?
1. CNG burns more efficiently.
2. CNG is cheaper.
3. It cannot be adulterated.
4. It cannot be siphoned off by thieves.
Subtopic: Â Air Pollution |
 84%
From NCERT
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Identify the incorrect statement:
| 1. | In human eye, cornea absorbs UV-B. |
| 2. | Good ozone is found in stratosphere. |
| 3. | Thickness of ozone is measured in Dobson Units. |
| 4. | Ozone hole is particularly marked over equatorial regions. |
Subtopic: Â Ozone Layer Depletion |
 85%
From NCERT
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What is the minimum percentage of impurities present that makes domestic sewage unfit for human use?
1. 0.1
2. 1.0
3. 5.0
4. 10.0
1. 0.1
2. 1.0
3. 5.0
4. 10.0
Subtopic: Â Water Pollution |
 87%
From NCERT
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Any gas that absorbs incoming solar radiation or outgoing infrared radiation is called as radiatively active gas. One of such gases which is major contributor to total global warming is:
1. Carbon dioxide
2. Methane
3. CFCs
4. N2O
1. Carbon dioxide
2. Methane
3. CFCs
4. N2O
Subtopic: Â Green House Effect & Global Warming |
 82%
From NCERT
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What is not true regarding the Montreal Protocol?
| 1. | It is an international treaty designed to protect the ozone layer. |
| 2. | It was signed in 1987. |
| 3. | It entered into force on 1 January 1989. |
| 4. | Same roadmap was developed for both developed and developing countries for reducing ozone depleting substances. |
Subtopic: Â Ozone Layer Depletion |
 65%
From NCERT
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What are the consequences of deforestation?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I. | Enhanced carbon dioxide concentration in the atmosphere |
| II. | Loss of biodiversity |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Â Resource Utilisation & Maintenance |
 91%
From NCERT
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If we consider the problem of environmental pollution, CNG is considered a better fuel for motor vehicles than diesel primarily because:
| 1. | it burns more efficiently than diesel |
| 2. | it cannot be adulterated |
| 3. | it cannot be siphoned off by thieves |
| 4. | setting up distribution points is very easy |
Subtopic: Â Air Pollution |
 90%
From NCERT
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Degradation of ozone continues for a very long time when CFCs are added to the stratosphere because of the formation of which of the following catalyst?
1. Carbon
2. Cl
3. Fe
4. Oxygen
1. Carbon
2. Cl
3. Fe
4. Oxygen
Subtopic: Â Ozone Layer Depletion |
 86%
From NCERT
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Match the items given in Column I with those in Column II and select the correct option given below:
| Column I | Column II | ||
| a. | Eutrophication | i. | UV-B radiation |
| b. | Enhanced greenhouse effect | ii. | Deforestation |
| c. | Snow blindness | iii. | Nutrient enrichment |
| d. | Slash and burn agriculture | iv. | Global warming |
| 1. | a-ii b-i c-iii d-iv |
| 2. | a-i b-iii c-iv d-ii |
| 3. | a-iii b-iv c-i d-ii |
| 4. | a-i b-ii c-iv d-iii |
Subtopic: Â Green House Effect & Global Warming |Â Ozone Layer Depletion |Â Resource Utilisation & Maintenance |Â Water Pollution |
 95%
From NCERT
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Two of the most common gases responsible for the ‘greenhouse effect’ are:
1. Carbon dioxide and methane
2. Ozone and Ammonia
3. Oxygen and Nitrogen
4. Nitrogen and Sulphur dioxide
1. Carbon dioxide and methane
2. Ozone and Ammonia
3. Oxygen and Nitrogen
4. Nitrogen and Sulphur dioxide
Subtopic: Â Green House Effect & Global Warming |
 93%
From NCERT
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