Question

IV. True or False
State whether the given statements are true or false.
1. Rubber is a good conductor of electricity.
2. Plastics are poor conductor of electricity.
3. All liquids conduct electricity.
4. Distilled water is free of salt.
5. Pure water conducts electricity.
6. Most liquids that conducts electricity are solutions of acids, bases and salts.
7. Electroplating is based on magnetic effect of electricity.
8. Small amount of some mineral salts are naturally present in water.
9. Chromium is carcinogenic.
10. An electric bulb glows due to chemical effect of electricity.
11. Distilled water when mixed with salt conducts electricity.
12. LED is an electric bulb which is used in a tester.
13. Deflection in compass needle is due to magnetic effect of current.
14. When electric current is passed through the copper sulphate solution, copper and sulphate ions are dissociated.
15. In an LED bulb, the shorter lead is connected to the positive terminal of the battery.
16. Electric current produces a magnetic effect.
17. Some liquids are good conductors of electricity and some are poor conductors of electricity.
18. Chromium has a shiny appearance.
19. Jewellery makers electroplate silver and gold on expensive metals.
20. Electroplating wastes are useful to human health and environment.

Answer 1

1. False
2. True
3. False
4. True
5. False
6. True
7. True
8. True
9. False
10. False
11. True
12. False
13. True
14. True
15. False
16. True
17. True
18. True
19. False
20. False

Answer 2

Answer:

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