Question

Which of the following is a weightless pollutant?

• A. Photochemical smog
• B. Heat, Sound and Radioactive waste
• C. SO${}_2$ and NO${}_2$
• D. Sewage and Exhaust emissions

Answer 1

The correct option is B Heat, Sound and Radioactive waste

Heat, sound and radioactive wastes are weightless pollutants. Heat causes pollution in the form of energy as thermal waste waters flowing out of electricity-generating units reduces the number of organisms and damage the indigenous flora and fauna. Noise causes pollution in the form of sound which produces unpleasant effects and discomfort on the ears and sometimes leads to permanent loss of hearing. Radiations are the electromagnetic waves that are given off by nuclear waste. These are extremely dangerous to organisms because it causes mutations at a very high rate. All the three are pollutants but does not have any physical weight.

So, the correct answer is option B.