Class 12 Chemistry · Chapter 17 · Test 2
Water Pollutants and Effects
50 MCQs
50 questions · 40 min · 50 marks
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Sample questions
The first 5 of 50. Try each one, then tap to see the answer.
Question 1
Microbiological pollution is the contamination of water by harmful:
- AMicroorganisms such as bacteria, viruses, protozoa and parasites
- BHeavy metals
- COil
- DPlastics
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Answer: A
These pose serious health risks to humans and animals.
Question 2
Microbiological pollution typically results from the discharge of:
- AIndustrial acids
- BUntreated or inadequately treated sewage and animal waste and hospital waste
- CPesticides only
- DPlastic bags only
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Answer: B
Runoff from agricultural land also contributes.
Question 3
Which are common pathogens found in microbiologically polluted water?
- ALead and mercury
- BNitrates and phosphates
- CEscherichia coli, Salmonella and Giardia
- DDDT and PCBs
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Answer: C
These cause water-borne diseases.
Question 4
Which are common water-borne diseases?
- AMinamata and itai-itai
- BBlue baby syndrome and chloracne
- CMalaria and dengue
- DCholera, typhoid, dysentery and hepatitis A
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Answer: D
They are caused by microorganisms in water.
Question 5
Boiling water can make it drinkable but it cannot remove:
- AHeavy metals and other chemical pollutants
- BBacteria
- CViruses
- DProtozoa
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Answer: A
Boiling kills microorganisms only.
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