Q13 of 55 Page 113

The major source of noise pollution worldwide is due to

With increasing number of vehicles, the noise created by honking horns of vehicles is also increasing. The rest of the machines are also sources of noise pollutions but the major source of noise pollution in every part of the world is transport system.

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11

The green scum seen in the fresh water bodies is

 12

The loudness of a sound that a person can withstand without discomfort is about

 14

Match the following and choose the correct option

The correct matches is;


 15

Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into: