Q. No.Which of the following material takes the longest time for biodegradation?
1.
Cotton
2.
Paper
3.
Bone
4.
Jute
Choose the incorrect statement:
| 1. | The Montreal Protocol is associated with the control of the emission of ozone-depleting substances |
| 2. | Methane and carbon dioxide are greenhouse gases |
| 3. | Dobson units are used to measure the oxygen content of air |
| 4. | Use of incinerators is crucial to the disposal of hospital wastes |
Among the following, which one causes the maximum indoor chemical pollution?
1. Burning coal
2. Burning cooking gas
3. Burning mosquito coil
4. Room spray
The green scum seen in the freshwater bodies is:
1. Blue-green algae
2. Red algae
3. Green algae
4. Both 1 and 3
The loudness of a sound that a person can withstand without discomfort is about:
| 1. | 150 dB | 2. | 215 dB |
| 3. | 30 dB | 4. | 80 dB |
The major source of noise pollution in the world is:
1. Office equipment
2. Transport system
3. Sugar, textile, and paper industries
4. Oil refineries and thermal power plants
Match the following and choose the correct option.
| Column I | Column II | ||
| A. | Environment Protection Act | i. | 1974 |
| B. | Air prevention & Control of pollution Act | ii. | 1987 |
| C. | Water act | iii. | 1986 |
| D. | Amendment of Air Act to include noise as an air pollutant | iv. | 1981 |
The correct match is :
| Options: | A | B | C | D |
| 1. | iii | iv | i | ii |
| 2. | i | iii | ii | iv |
| 3. | iv | i | ii | iii |
| 4. | iii | iv | ii | i |
Catalytic converters are fitted into automobiles to reduce the emission of harmful gases. Catalytic converters change unburnt hydrocarbons into:
1. Carbon dioxide and water
2. Carbon monoxide
3. Methane
4. Carbon dioxide and methane
It is necessary to remove sulphur from petroleum products to
| 1. | reduce the emission of sulphur dioxide in exhaust fumes |
| 2. | increase efficiency of automobiles' engines |
| 3. | use sulphur removed from petroleum for commercial purposes |
| 4. | increase the life span of engine silencers |
Which one of the following impurities is easiest to remove from wastewater?
| 1. | Bacteria | 2. | Colloids |
| 3. | Dissolved solids | 4. | Suspended solids |
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