1. Which of the following is the lightest metal?

(a) Mercury

(b) Silver

(c) Lithium

(d) Lead

2. The most important ore of Aluminium is

(a) bauxite

(b) calamine

(c) calcite

(d) galena

3. The element present in the largest amount in rocks and minerals is

(a) carbon

(b) silicon

(c) hydrogen

(d) aluminium

4. An alloy used in making heating elements for electric heating devices is

(a) solder

(b) alloy steel

(c) nichrome

(c) German silver

5. German silver is an alloy of

(a) copper, nickel and silver

(b) silver, copper and aluminium

(c) zinc, copper, and nickel

(d) silver, zinc and copper

6. Match the following:

A. Aluminum. 1. Monazite

B. Uranium. 2. Pitchblende

C. Thorium. 3. Bauxite

D. Lead. 4. Galena

5. Haematite

(a) A 5, B 3, C 2, D 4

(b) A 3, B 2, C 4, D 1

(c) A 3, B 2, C 1, D 4

(d) A 2, B 3, C 1, D 5

7. Diamond is an allotropic form of

(a) silicon

(b) carbon

(c) sulphur

(d) germanium

8. Air is a/an

(a) compound

(b) element

(c) mixture

(d) electrolyte

9. Which of the following is the best conductor of electricity?

(a) Ordinary water

(b) Seawater

(c) Boiled water

(d) Distilled water

(e) Rainwater

10. Balloons are filled with

(a) helium

(b) oxygen

(c) nitrogen

(d) argon

1. c. 2. a. 3. b. 4. c. 5. c. 6. c. 7. b. 8. c. 9. b. 10. a