Environmental Degradation & Pollution — MCQs

All questions with answers and explanations

Read the full set here, or use the practice card above to test yourself one question at a time.

1. Environmental degradation is best described as:

   • A synonym for pollution with no difference
   • The broader deterioration of the environment through resource depletion, ecosystem destruction, and biodiversity loss (correct answer)
   • Only air pollution
   • A legal remedy under the Water Act

   Explanation. Environmental degradation is the broader process of environmental deterioration — pollution is one of its principal causes, not the whole of it.

2. Pollution occurs when harmful substances:

   • Are present in any trace amount, however small
   • Accumulate beyond the environment's natural capacity to absorb or neutralise them (correct answer)
   • Are only found in industrial areas
   • Only come from natural sources

   Explanation. Pollution occurs specifically when harmful substances exceed the environment's natural absorption capacity, causing adverse effects — mere trace presence isn't pollution in the legal sense.

3. Which of the following is NOT one of the six main kinds of pollution?

   • Thermal pollution
   • Radioactive pollution
   • Light pollution (correct answer)
   • Noise pollution

   Explanation. The six main kinds are air, water, soil, noise, thermal and radioactive pollution. Light pollution is not among them.

4. A sudden rise in a river's temperature caused by discharge of heated water from a power plant is an example of:

   • Radioactive pollution
   • Thermal pollution (correct answer)
   • Noise pollution
   • Global warming

   Explanation. Thermal pollution refers specifically to a sudden temperature change in a water body, typically from discharged heated water — distinct from the atmosphere-wide phenomenon of global warming.

5. Which of the following is a human-induced (anthropogenic) cause of pollution?

   • Volcanic eruptions
   • Industrial activities and urbanisation (correct answer)
   • Ocean currents
   • Solar radiation

   Explanation. Industrial activities, urbanisation, agriculture, waste disposal, mining, deforestation, and overpopulation are human causes of pollution. Natural causes, such as volcanic ash and dust storms, are far smaller today.

6. The effects of pollution fall on which four broad areas?

   • Human health, ecosystems, climate, economy (correct answer)
   • Only politics and law
   • Only agriculture
   • Only urban planning

   Explanation. The effects of pollution fall on human health, nature, the climate and the economy.

7. Which Act defines "environmental pollution" as the presence in the environment of any environmental pollutant?

   • The Wild Life (Protection) Act, 1972
   • The Environment (Protection) Act, 1986, section 2(c) (correct answer)
   • The Motor Vehicles Act, 1988
   • The Indian Forest Act, 1927

   Explanation. Section 2(b) of the Environment (Protection) Act, 1986 defines an environmental pollutant, and section 2(c) defines environmental pollution as the presence in the environment of any environmental pollutant.

8. Which relationship correctly describes environmental degradation and pollution?

   • They are interchangeable terms with no difference
   • Every case of degradation requires pollution, with no exceptions
   • Pollution is one specific mechanism of harm; degradation is the broader, cumulative decline it (along with other causes) contributes to (correct answer)
   • Degradation only happens in cities, pollution only in villages

   Explanation. Pollution is one specific mechanism of harm; degradation is the broader, longer-term decline it contributes to, alongside deforestation, overexploitation, and habitat loss — degradation can occur even without pollution (e.g. pure overharvesting).