Electricity does not flow through:

1. human body
2. animal's body
3. rubber
4. silver

We should not touch the switch with wet hands, otherwise:

1. electricity may pass through our body
2. electricity may not pass through the appliance
3. circuit may break
4. the switch may get off

How will you test whether a given rod is a magnet or not?

How will you test whether a given rod is made of iron or not?