Q. No.
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
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
The group most profoundly affected by global warming normally is:
| 1. | Plants | 2. | Insects |
| 3. | Birds | 4. | Mammals |
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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
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What would be true for acid rain?
| 1. | Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. |
| 2. | The pH of acid rain is most commonly below 4. |
| 3. | Acid rain has direct significant effects on human health. |
| 4. | Both the higher pH and lower aluminium concentrations in surface water that occur as a result of acid rain can cause damage to fish and other aquatic animals. |
Catalytic converters can also contribute to environmental pollution by increasing the emission of:
| 1. | Methane | 2. | Hydrogen cyanide |
| 3. | Particulate matter | 4. | Carbon dioxide |
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Which of the following are commonly used as a bacterial indicator of water pollution?
| 1. | Coliforms | 2. | Shigella |
| 3. | Giardia | 4. | Salmonella |
Eutrophication of lakes would lead to:
1. Decreased biomass of phytoplankton
2. Increased dissolved oxygen levels in water
3. Decreased biodiversity
4. Increase in the aesthetic value of the lake
Identify the incorrect statement regarding the ecological impact of DDT:
| 1. | It is a persistent organic pollutant. |
| 2. | As it is lipophilic, it bioaccumulates especially in predatory birds. |
| 3. | It can be metabolized to non-toxic forms by human beings. |
| 4. | It causes eggshell thinning in predatory birds. |
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