Water Purification — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Water Purification MCQs with step-by-step solutions (5 questions). Part of Substances in Daily Use & Applied Chemistry. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Water Purification · medium · theory
The settling down of heavy insoluble impurities in water on standing is called:
A. aeration
B. sedimentation ✓ Correct
C. evaporation
D. chlorination
Solution: In sedimentation, suspended solid impurities settle at the bottom.
Q2 — Water Purification · hard · theory
Chlorine is added to drinking water in a treatment plant mainly to:
A. add taste
B. kill disease-causing germs ✓ Correct
C. increase hardness
D. remove colour only
Solution: Chlorination disinfects water by killing bacteria and other pathogens.
Q3 — Water Purification · medium · theory
A simple household method to make water safe for drinking by killing microbes is:
A. colouring
B. shaking
C. freezing
D. boiling ✓ Correct
Solution: Boiling water kills most disease-causing microorganisms, making it safer to drink.
Q4 — Water Purification · hard · theory
Reverse osmosis (RO) purifiers are used mainly to remove:
A. dissolved salts and impurities ✓ Correct
B. only large solid particles
C. only colour
D. oxygen
Solution: RO forces water through a semipermeable membrane, removing dissolved salts and fine impurities.
Q5 — Water Purification · medium · theory
Water that is safe and fit for drinking is described as:
A. distilled sea water only
B. hard water only
C. potable water ✓ Correct
D. polluted water
Solution: Potable water is clean water that is safe to drink.