Question

1.Which of the following rivers is called the world’s most polluted river?
(a) Ganga River
(b) Chenab River
(c) Cauvery River
(d) Yamuna River
2. Which of the following techniques is used for reducing the total dissolved solids (TDS) in the water?
(a) Osmosis
(b) Ion exchange
(c) Distillation
(d) Both b and c
3. Which of the following salts is the main cause of permanent hardness of water?
(a) Magnesium sulphate
(b) Magnesium bicarbonate
(c) Magnesium carbonate
(d) None of the above

4. Chlorofluorocarbon are nonflammable chemicals mainly used in _________.
(a) Perfumes
(b) Refrigerators
(c) Air conditioners
(d) All of the above

5.What are the health effects of excess fluoride in drinking water?
(a) Fluorosis
(b) Toothaches
(c) Lung disease
(d) Intestinal infection

Answer 1

Answer:

1. (a) ganga river
2. (a) osmosis
3. (d) none of the above
4. (b) refrigerators
5. (a) fluorosis

Answer 2

Answers for all the questions are as follows -

1. Which of the following rivers is called the world’s most polluted river?

(a) Ganga River

Ganga river is one of the most polluted river.

2. Which of the following techniques is used for reducing the total dissolved solids (TDS) in the water?

(a) Osmosis

Reverse Osmosis is the technique used to reduce Total Dissolved Solids (TDS).

3. Which of the following salts is the main cause of permanent hardness of water?

(d) None of the above

Permanent hardness of water is caused due to sulphate and chloride salt of magnesium, calcium etc.

4. Chlorofluorocarbon are nonflammable chemicals mainly used in _________.

(d) All of the above

Perfumes, refrigerators and air conditioners, all of these contain chlorofluorocarbon which is cause of environment degradation.

5.What are the health effects of excess fluoride in drinking water?

(a) Fluorosis

Fluorosis effects bones and teeth and deposits in tissues of body.