RPSC POLY. TECH. LECT. 2011
⭕ A. Turbidity
⭕ B. Colour
⭕ C. Odour
⭕ D. Bacteria’s
📚 Explanation:
Disinfection of drinking water is mainly done to eliminate pathogenic bacteria that cause water-borne diseases.
🔹 It helps prevent diseases like cholera, typhoid, dysentery, etc.
🔹 The most commonly used disinfectant is bleaching powder (chlorine).
Why not other options?
🔸 Turbidity: Removed by sedimentation & filtration, not disinfection.
🔸 Colour: Removed by coagulation or activated carbon.
🔸 Odour: Treated using aeration or activated carbon.
Disinfection of drinking water is mainly done to eliminate pathogenic bacteria that cause water-borne diseases.
🔹 It helps prevent diseases like cholera, typhoid, dysentery, etc.
🔹 The most commonly used disinfectant is bleaching powder (chlorine).
Why not other options?
🔸 Turbidity: Removed by sedimentation & filtration, not disinfection.
🔸 Colour: Removed by coagulation or activated carbon.
🔸 Odour: Treated using aeration or activated carbon.
👉 Therefore, the correct answer is: D. Bacteria’s
Key Points on Water Disinfection:
- Purpose: Removes pathogenic microorganisms.
- Bleaching powder: Most commonly used disinfectant.
- Not for turbidity/colour: These require filtration or chemical treatment.
- Safety: Essential last step before water supply.
