Which of the following measures is/are to be adopted against the water pollution? 1. The sewage before discharging into the water body may need not be treated 2. The industrial waste should not be treated before disposing it off 3. As far as possible water sources should not be used for discharging the sewage Select the correct answer.
- A1, 2 and 3
- B1 only
- C3 onlyCorrect
- D1 and 2 only
Solution
Concept
Measures against water pollution
Step-by-step solution
1. Sewage and industrial wastes must be treated before disposal (statements 1 and 2 are wrong). 2. Water sources should not be used for dumping sewage (statement 3 is right).
Explanation
Treatment of wastes before discharge and keeping water bodies free from waste are the basic measures.
Why the other options are wrong
Statements 1 and 2 recommend leaving wastes untreated, which is contrary to pollution control.
Shortcut
Treat first; do not use sources as sewers.
Common mistake
Choosing a statement that allows untreated disposal.
Correct answer: C) 3 only