Select conductors and insulators from the following:

Glass, silver, copper, wood, paper, pure water, impure water, aluminium, iron, leather, plastic, steel, human body and ebonite

The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer.

In which arrangements are the appliances connected in the electric circuit of our homes, Series or Parallel? Give one reason for your answer.

Karuna carried a magnetic compass with her on a school picnic. When she placed the compass near the metal flask, the needle only jerked. Monika had two bar magnets. When the magnet was brought near the compass, the needle turned strongly towards the magnet.

Answer the following :

(i) Why did the metal flask not attract the compass needle much ?

(ii) Why did the needle move strongly towards the bar magnet ?

(iii) If Monika flips the magnet, what will happen to the direction of the compass needle ?

(iv) Why is repulsion the only test of a magnet ?