Question

E. Choose the correct option in each of the following.
1. Which of the following affect(s) the ozone layer?
(a) Carbon dioxide
(b) CFCs
(c) Soot
(d) Dust
2. The ozone layer in our atmosphere protects us from the bad effects of
(a) the sun's ultraviolet rays
(b) carbon dioxide
(c) CFCs
(d) all of these
3. Which of the following is an oxygen-demanding waste?
(a) Pesticides
(b) Oil
(c) Grease
(d) Domestic sewage
4. Which of the following is/are used for disinfecting water?
(a) Chlorine
(b) Ozone
(c) Ultraviolet rays
(d) All of these
5. Reverse osmosis is used for the purification of
(a) air
(b) water
(c) air as well as water
(d) neither air nor water​

Answer 1

Answer:

1) (B) CFCs

2) (A) Sun's uv rays

3) (D) Domestic sewage

4) (A) chlorine

5) (B) water