The green scum seen in the freshwater bodies is
blue green algae
red algae
green algae
Both (a) and (c)
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