Class 9 Pollution Mock Test (ICSE)

Topics in Pollution

• Air pollution: sources, effects and prevention
• Water pollution
• Soil pollution
• Noise and radiation pollution

Pollution practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following units is commonly used to measure the intensity or loudness of sound in the context of noise pollution?

   1. (a)Pascal
   2. (b)Hertz
   3. (c)Decibel
   4. (d)Dioptre
   Show answer and step marks

   1. Correct option: (c) Decibel+1

   Answer: (c)
2. Q2Multiple choice·1 mark
   The excessive enrichment of water bodies with nutrients leading to dense growth of plant life and depletion of dissolved oxygen is called:

   1. (a)Salinization
   2. (b)Biomagnification
   3. (c)Sedimentation
   4. (d)Eutrophication
   Show answer and step marks

   1. Correct option: (d)+1

   Answer: (d)
3. Q3Multiple choice·1 mark
   Which of the following gases is primarily responsible for the depletion of the ozone layer and acts as a potent air pollutant?

   1. (a)Chlorofluorocarbons (CFCs)
   2. (b)Carbon dioxide
   3. (c)Methane
   4. (d)Sulphur dioxide
   Show answer and step marks

   1. Correct option: (a)+1

   Answer: (a)
4. Q4Short answer·2 marks
   State any two measures to control air pollution.
   Show answer and step marks

   1. First measure, any one of: using cleaner fuels such as CNG or LPG in vehicles; using public transport or car-pooling; planting trees (afforestation); fitting filters, electrostatic precipitators or scrubbers to factory chimneys; locating industries away from residential areas; using renewable energy such as solar or wind power; regular pollution checks and emission standards for vehicles; or any other valid measure.+1
   2. Second measure, a different one from the same list.+1

   Answer: Any two of: cleaner fuels such as CNG, public transport, afforestation, filters or electrostatic precipitators on chimneys, industries away from residential areas, renewable energy, vehicle emission checks.
5. Q5Long answer·4 marks
   (a) State two major human activities that lead to severe water pollution in Indian rivers. (b) Mention two effective preventive measures that can be adopted to control water pollution.
   Show answer and step marks

   1. (a) First human activity, any one of: discharge of untreated industrial effluents containing toxic chemicals and heavy metals; dumping of untreated domestic sewage and municipal waste; run-off of chemical fertilisers and pesticides from farms; bathing, washing clothes, immersing idols and throwing ashes or half-burnt bodies into rivers; or any other valid human activity.+1
   2. (a) Second human activity, a different one from the same list.+1
   3. (b) First preventive measure, any one of: Effluent Treatment Plants in industries to treat waste water before release; treating municipal sewage in sewage treatment plants; reducing the use of chemical fertilisers and pesticides (organic farming); banning the dumping of waste, idols and bodies in rivers along with public awareness; strict enforcement of pollution laws such as the Water Act, 1974; river-cleaning programmes such as Namami Gange; or any other valid measure.+1
   4. (b) Second preventive measure, a different one from the same list.+1

   Answer: (a) Any two of: untreated industrial effluents, untreated domestic sewage, farm run-off of fertilisers and pesticides, bathing, washing and immersion of idols or ashes in rivers. (b) Any two of: Effluent Treatment Plants in industries, sewage treatment plants, less use of farm chemicals, banning dumping in rivers with public awareness, strict enforcement of pollution laws.
6. Q6Long answer·4 marks
   (a) State two major human activities responsible for the pollution of rivers in India. (b) Mention two effective measures that can be adopted to control water pollution.
   Show answer and step marks

   1. (a) First human activity, any one of: discharge of untreated industrial effluents containing toxic chemicals, acids and heavy metals; release of untreated domestic sewage and municipal waste from towns; run-off of chemical fertilisers and pesticides from farms; bathing, washing clothes, immersing idols and throwing ashes or half-burnt bodies into rivers; or any other valid human activity.+1
   2. (a) Second human activity, a different one from the same list.+1
   3. (b) First measure, any one of: compulsory Effluent Treatment Plants in industries to treat waste water before disposal; sewage treatment plants for towns; reducing the use of chemical fertilisers and pesticides (organic farming); strict enforcement of water pollution laws; public awareness against dumping religious offerings, plastics and waste into rivers; river-cleaning programmes such as Namami Gange; or any other valid measure.+1
   4. (b) Second measure, a different one from the same list.+1

   Answer: (a) Any two of: untreated industrial effluents, untreated domestic sewage, farm run-off of fertilisers and pesticides, bathing, washing and immersion of idols or ashes. (b) Any two of: Effluent Treatment Plants, sewage treatment plants, less use of farm chemicals, strict enforcement of pollution laws, public awareness against dumping, river-cleaning programmes.

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