The loudness of a sound that a person can withstand without discomfort is about
150 dB
215 dB
30 dB
80 dB
The major source of noise pollution, world wide is due to
office equipment
transport system
sugar, textile and paper industries
oil refineries and thermal power plants
$$ \text { Match correctly the following and choose the correct option } $$
| A. | Environment Protection Act | 1. | 1974 |
|---|---|---|---|
| B. | Air Prevention and Control of Pollution Act | 2. | 1987 |
| C. | Water Act | 3. | 1986 |
| D. | Amendment of Air Act to include noise | 4. | 1981 |
The correct matches are
A B C D
$3 \quad 4 \quad 1 \quad 2$
A B C D
$1 \quad 3 \quad 2 \quad 4$
A B C D
$4 \quad 1 \quad 2 \quad 3$
A B C D
$3 \quad 4 \quad 2 \quad 1$
Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into
carbon dioxide and water
carbon mono oxide
methane
carbon dioxide and methane
Why is it necessary to remove sulphur from petroleum products?
To reduce the emission of sulphur dioxide in exhaust fumes
To increase efficiency of automobiles engines
To use sulphur removed from petroleum for commercial purposes
To increase the life span of engine silencers