Radiators in automobiles are not completely filled why ???
How can one determine the north (N) and south (S) pole of a magnet ?
Which gas is used in Mercury vapour ? And why ?
What is an electric circuit? what are the types of the electric circuits? draw the diagram of it.
Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.
Define conductors and insulators with example.
What is electricity? what are the sources of electricity?
What happens when an electric fan is switched on in the closed room?