Which one of the following is one of the objects of water treatment?
- ATo detect the dissolved gases, murkiness and colour of water
- BTo detect the pleasant and objectionable tastes of water
- CTo kill all the pathogenic germs, which are harmful to the human healthCorrect
- DTo detect the tuberculating and corrosive properties of water
Solution
Concept
Objectives of water treatment
Step-by-step solution
1. Water treatment aims at removing impurities, making water safe and palatable, and killing pathogens (disinfection). 2. Options (a), (b) and (d) say "detect", which is the work of testing, not of treatment.
Explanation
The main object is to make water safe for drinking by removing or killing harmful germs. Detection of properties belongs to water quality testing.
Why the other options are wrong
(a), (b) and (d) describe detecting qualities, not treating the water.
Shortcut
Treatment removes/kills; testing detects.
Common mistake
Mixing testing and treatment.
Correct answer: C) To kill all the pathogenic germs, which are harmful to the human health