Q4. Assertion: a metal rod with a plastic handle can be charged by rubbing. Reason: the plastic handle, an insulator, stops the charge from leaking through the body to the ground. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion (NCERT pages 3–4).
Q5. Is the earth a conductor or an insulator?
A conductor (NCERT page 3).
Q6. Some charge is transferred to a small region of an isolated copper plate. What happens to it?
It readily spreads over the entire surface of the plate, because copper is a conductor (NCERT page 3).