1Write the difference between a closed circuit and an open circuit.
2Write the difference between a fuse wire and an MCB.
3Give the reason: an MCB is easier to use than a fuse.
4Give the reason: a fuse is called a protective wire.
5What is a magnetic field?
6Define an electromagnet. Describe how an iron nail is made into an electromagnet.
7What is an electric circuit? What is the minimum equipment needed to make one?
8What is a heating element? Give any two examples of it.
9What is a simple cell? Describe how to make a simple cell from a potato.
10Draw an electric circuit using the symbols for a cell, a lamp, a wire and a switch.
11What would you do if the fuse of your house blew while you were alone at home? Write your own view.
12The fuse in Ronis's house keeps blowing and has to be replaced again and again. A neighbour advises putting a slightly thicker copper wire in place of the fuse, saying it will not need changing and the family can use electricity without worry. Give your response to this advice, with reasons.
13An MCB in a house keeps tripping down and cutting off the supply. The owner wedges it with a piece of wood so that it cannot trip, and goes on using electricity. What will happen? Write the advice you would give as well.
14Electricity has become an essential thing for people today. Support this statement with your own arguments.
15Why do more iron filings gather at the two ends of a magnet than in its middle?
16What can be done to increase the strength of an electromagnet?
17Why is a simple cell of little use in our daily life?
18What are the effects of current electricity? Name them and give one example of each.
19Why must the mains line of a house not be used when making an electromagnet?