Physics 8th grade final test sem.2

Please answer the following questions briefly

1. what is meant by neutral wire, live wire and earth wire?
2. what is the main function of circuit breaker?
3. what are the hazards of using electricity?
4. why do we need double insulation?
5. What are the properties of magnet?
6. how to do magnetic induction?
7. how to do magnetisation by using electricity?
8.what are the uses of magnet in daily life (3 answers)