Q. No.
The intensity of noise beyond which physical discomfort is:
1. 70 dB
2. 80 dB
3. 100 dB
4. 120 dB
1. 70 dB
2. 80 dB
3. 100 dB
4. 120 dB
The CPCB has recommended zone-wise ambient noise levels. The limit during the day in residential areas is:
1. 75 dB
2. 65 dB
3. 55 dB
4. 50 dB
Radiatively active gases do not include:
1. Methane
2. Ammonia
3. Nitrous oxide
4. Chloroflouro carbons
Identify the incorrect statement regarding CFCs:
| 1. | They are synthetic gaseous compounds of carbon and halogens |
| 2. | Major sources are the refrigeration industry and industrial solvents |
| 3. | They have been only recently added to the atmosphere - synthesized during the 20th century |
| 4. | They have a short life in the atmosphere - 5 to 12 years |
The group most profoundly affected by global warming normally is:
| 1. | Plants | 2. | Insects |
| 3. | Birds | 4. | Mammals |
Which of the following is not a consequence of global warming?
| 1. | a rise in sea levels |
| 2. | a change in precipitation patterns |
| 3. | an equatorial shift of many species |
| 4. | eruption of plant diseases, pests, and weeds |
The concentration of ozone in the stratosphere is normally lowest during the period:
1. February - April
2. May - July
3. July - October
4. November - January
Which of the following commits the industrialised nations to reduce greenhouse gas emissions?
1. Montreal protocol
2. Kyoto protocol
3. UNECD earth summit
4. Alma Atta conference
A substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource is called:
| 1. | Pathogen | 2. | Allergen |
| 3. | Pollutant | 4. | Secondary metabolite |
Identify the incorrect statement regarding primary air pollutants:
| 1. | Carbon monoxide is a product of incomplete combustion of fossil fuels. |
| 2. | Methane is the most abundant hydrocarbon in the atmosphere |
| 3. | A high concentration of sulphur dioxide causes severe respiratory problems |
| 4. | Particulate matter less than 1 micrometer in diameter generally settle out in less than a day. |
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