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. 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. 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

Q.

Classify the following as good conductors and insulators:

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

Q.

State one use each of the following non-metals:
Copper, Aluminium, Iron, Silver, Gold, Mercury

Q.

Define electrical conductivity. Which of the following do not conduct electricity.

Carbon, Aluminium, Copper, Glass, Wood and Iron.