Question

Which of the following is an insulator? (a) Human body
(b) Graphite
(c) Pure water
(d) Copper
2.In electroplating, the object to be electroplated is made:
(a) anode
(b) cathode
(c) none
(d) both
3.The extraction of metals from their ores by electrolysis is called: (a) electroplating
(b) electrometallurgy
(c) electro refining
(d) none
Worksheet

Ryan International Group of Institutions
Worksheet/Assignment
Science/VIII/Chemical Effects of Current/WS01
4.The refining or purification of metals by passing electric current is called: (a) electroplating
(b) electrolysis
(c) electro refining
(d) none
5.Carbon rods, used as electrodes are made up of: (a) graphite
(b) wood
(b) iron
(d) diamond
Answer the following question:
1. What is an electric current?
2. How can distilled water be made a conductor of electricity?
3. Will a bulb glow when a circuit is completed in an insulating solution?

Answer 1

1. Pure water

2.None

3.None

4.Electro refining

Answer 2

Answer:

1.c) pure water

2.d)both

3.d) none.

4.b) electrolysis

5.c)iron

1. continuous flow of electrons in an electric circuit is called an electric current.

2.distilled water can be made a good conductor of electricity by adding some common salt to it. distilled water can be made a good conductor by adding salt,and sugar to it.

3.The bulb will not glow.