Given below is a representation of a kind of pollution (a scene showing heavy traffic, horns and loudspeakers). Study the same and answer the questions that follow: Given below is a representation of a kind of pollution (a scene showing heavy traffic, horns and loudspeakers). Study the same and answer the questions that follow:

List any three common sources of this pollution.
Topic: Sources of noise pollution
Answer
- VEHICULAR TRAFFIC — horns, engines and exhausts.
- INDUSTRIAL MACHINERY and workshops.
- LOUDSPEAKERS at functions, processions and public gatherings.
(Also acceptable: aircraft, construction work, bursting of crackers.)
THREE are asked for, so give exactly three, and make them DIFFERENT IN KIND rather than three sorts of vehicle.
A useful way to group them: TRANSPORT — traffic, railways, aircraft INDUSTRY — machinery, generators, construction SOCIAL — loudspeakers, crackers, processions
The last group is the one most within ordinary control, which matters because part (iii) leads towards the harm done and any follow-up question would ask about remedies.