1.
Which of the following non-metals conduct electricity?
Diamond
Graphite
Silicon
Vanadium
2.
Which of the following alloys contain copper?
I. Brass
II. Bronze
III. Duralumin
I and II only
I and III only
II and III only
I, II and III
3.
Aluminium is used for making high tension cables because it is
I. light.
II. highly conducting.
III. brittle.
I and II only
I and III only
II and III only
I, II and III
4.
Which of the following metals is a liquid at room temperature?
Lead
Aluminium
Silver
Mercury