Question

II. Fill in the Blanks
Fill in the blanks with suitable word/s.
1. Substances that conduct electricity are called ___________.
2. Substances that do not conduct electricity are called ___________.
3. A cation has ___________ charge.
4. Some liquids are ___________ conductors of electricity and some are ___________ conductors of electricity.
5. Distilled water is an ___________.
6. Distilled water when mixed with salts becomes a ___________ conductor of electricity.
7. Light emitting diodes (LED) glow even when a ___________ electric current flows through it.
8. The passage of an electric current through a conducting solution causes ___________.
9. Change in colour is an example of the ___________ effect of current.
10. There are ___________ wires attached to an LED.
11. In an LED, the longer lead is attached to the ___________ terminal of the battery and the shorter lead to the ___________ terminal.
12. Chromium has a ___________ appearance.
13. Distilled water is made by removing all ___________.
14. Iron tends to ___________ and ___________.
15. A coating of ___________ is deposited on iron to protect it from corrosion and formation of rust.
16. An electric lamp glows due to ___________ effect of electric current.
17. Electrodes are ___________.
18. The deflection in ___________ shows that current is passing.
19. ___________does not corrode easily.
20. An electrolyte is a ___________.

Answer 1

1.The substances whose aqueous solutions conduct electricity are called electrolytes.

2.Materials that are poor conductors of electricity are called insulators. 

4.Metals, graphite and certain liquids are a few examples of good conductors of electricity.

5.Distilled water is water that has been boiled into vapor and condensed back into liquid in a separate container.

6.Dissolve a pinch of common salt in distilled water. When salt is dissolved in distilled water we get salt solution. By passing current through it ,we will find that the magnetic needle of compass shows deflection. Thus, distilled water becomes a good conductor of electricity on dissolving a little of salt in it.

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Answer 2

there are ___wires attached to an LED