Q41. When electric cell has to be replaced with a new one?
Q42. Conductors and insulators are equally important for us. Give reasons.
Q43. What is the function of a switch in an electric circuit?
Q44. Differentiate between primary cells and secondary cells.
Q45. When we touch live wire we get a shock whereas bird sitting on wire does not get shock. Why?
Q46. Write some purposes for which we use electricity.
Q47. How conductors are different from insulators?
Q48. Why handles of tools like screwdrivers, pliers and electric tester are covered with plastic or rubber?
Q49. Why we should not join the two terminals of an electric cell without connecting them through a switch or a device like a bulb?
Q50. Fused bulb does not glow. Give reason.