Water Worksheet-6

Water Worksheet-6

Multiple-Choice Question:

11. When water is cooled it contracts until it reaches ___ then it starts expanding.

(A) 40°C               (B) 37°C               (C) 0°C                 (D) 4°C

12. Water, ice and steam are all:

(A) Elements       (B) Mixtures        (C) Compounds   (D) None of these

13. Solubility of gases in water:

(A) Decreases with increase in pressure

(B) Increases with increase in pressure

(C) Pressure has no effect on solubility

(D) None of these

14. By burning which of the following elements would you get water?

(A) Hydrogen      (B) Oxygen          (C) Carbon           (D) Nitrogen

15. Pure water can be made good conductor of electricity by adding:

(A) Sodium hydroxide                     (B) Sodium chloride

(C) Sulphuric acid                            (D) Any of these

16. Chemical treatment of surface water can be carried out by the addition of:

(A) Bleaching powder                     (B) Alum

(C) Oxygen                                       (D) Carbon dioxide

17. Cathode is a ________ terminal of battery.

(A) Positive          (B) Negative        (C) Neutral

18. The electrodes used in electrolysis of water are made up of:

(A) Platinum        (B) Iron                (C) Nickel             (D) Chromium

19. Residual amount of artificial fertilizer, pesticide, insecticide:

(A) Pollutes underground water    (B) Favours growth of algae

(C) Affects aquatic organism (D) All of these

Answer Key:

11. (D)
12. (C)
13. (B)
14. (A)
15. (D)
16. (A)
17. (B)
18. (A)
19. (D)