Question

B. Tick (✓) the correct answer.
1. Pure water is
(a) colourless and opaque
(b) colourless and transparent
(C) coloured and transparent
(d) colourless, odourless and transparent
2. Which of the following is not a water pollutant ?
(a) metal nitrates
(b) sewage
(c) oxygen
(d) human excreta
3. The aerobic bacteria can be grown in clarified water by
(a) filtration
(b) chlorination
(c) aeration
0 (d) sedimentation
4. The fuel obtained by decomposing sludge is
(a) kerosene
(b) petrol
(c) biogas
(d) diesel​

Answer 1

Answer:(d) colourless, odourless and transparent

Explanation:

Answer 2

Answer:

1.(d)

2.(c)

3.(d)

4.(d)