Which of the following groups of materials contain only conductors?
(a) copper, zinc, glass, plastic
(b) zinc, cotton, iron, plastic
(c) copper, gold, silver, iron
(d) glass, wood, cotton, air

Q. Which of the following groups of materials contains only metals?
(a) copper, iron, plastic, glass
(b) copper, gold, iron, silver
(c) cotton, iron, wood, gold
(d) glass, wood, cotton, air

Q.

Classify the following as good conductors and insulators:

Wood, plastic, copper, rubber, silver, iron, glass, steel, distilled water, tap water, sea water

Q.

What are conductors and insulators?
Classify the following as conductors and insulators:
Wood, plastic, copper, rubber, silver, iron, glass, steel, distilled water, tap water, sea water

Q. Study these groups of objects. In each, one object does not belong in the group.

Group I	Group II	Group III
cotton	wood	paper
sponge	iron	wood
stone	aluminium	cloth
silk	copper	glass

Which objects do not belong in these groups?
(a) stone, wood, paper
(b) stone, copper, glass
(c) sponge, wood, glass
(d) stone, wood, glass