set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which are the most abundant elements in the universe ?

a) Hydrogen and Oxygen

b) Hydrogen and Helium

c) Oxygen and Nitrogen

d) Carbon and Nitrogen

Question : 2

What are Rubies and Sapphires chemically known as?

a) Aluminium Oxide

b) Lead Tetroxide

c) Silicon Dioxide

d) Boron Nitride

Question : 3

Sodium is obtained by the electrolysis of

a) fused sodium chloride

b) an aqueous solution of sodium chloride

c) an aqueous solution of sodium hydroxide

d) fused sodium sulphate

Question : 4

Doctors, Artists and Sculptors use Calcium Sulphate which is popularly known as

a) Limestone

b) Bleaching powder

c) Quick lime

d) Plaster of Paris

Question : 5

Sodium Vapour Lamp is usually used as street light, because

a) Light from this is monochromatic and will not split through water droplets

b) It is pleasing to the eyes

c) These are cheap

d) It is brightly illuminating

Question : 6

Match List-I with List-II:

a) 2 3 4 1

b) 2 3 1 4

c) 3 2 1 4

d) 3 2 4 1