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1.
Catalytic converters are fitted into automobiles to reduce the emission of harmful gases. Catalytic converters changes unburnt hydrocarbons into
2.
What percentage of total area in hilly regions does the National Forest Policy (1988) suggest to be under forests?
3.
Increase the atmospheric temperature due to 
is called
is called
4.
Which one of following is not an air pollutant?
5.
DDT residues are rapidly passed through food chain causing biomagnifications because DDT is
6.
Rain is called acid rain when its 
is below
is below
7.
are responsible for
are responsible for
8.
Acid rain is due to
9.
Noise is
10.
Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic (free floating) algae which can accelerate which of the following phenomenon?