Q. No.In an algal bloom, the cause of death of other algae is usually:
1. toxins
2. decreased DO
3. decreased sunlight
4. decreased nutrients
1. toxins
Identify the incorrectly matched pair with respect to contamination of water:
1. Minamata disease: Mercury
2. Blue bay syndrome: excessive nitrates
3. Black foot disease: excessive arsenic
4. Dental caries: excessive fluoride
A painful bone condition is produced when the drinking water is contaminated with:
1. Lead
2. Mercury
3. Cadmium
4. Arsenic
Combustion of solid wastes in the absence of oxygen is known as:
| 1. | Incineration | 2. | Pyrolysis |
| 3. | Anaerobiosis | 4. | Burning |
The intensity of noise beyond which physical discomfort is:
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 |
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