some important man made materials - Category wise Question and Answer Practice Test with Solutions

Question : 6

The principle of cleaning by soap is

a) viscosity

b) floatation

c) surface tension

d) elasticity

Question : 7

The aqueous solution of one of the following vitamins is dark in colour

a) B₆

b) B₂

c) B₁

d) B₁₂

Question : 8

The property of plasticity is shown by clay , when it is

a) dried at room temperature after kneading

b) heated strongly

c) mixed with proper proportion of water

d) glazed

Question : 9

The most important raw materials used in the manufacture of cement are

a) transition metal oxides, sodium hydroxide or potassium hydroxide

b) limestone, clay and gypsum

c) potassium nitrate, charcoal and sulphur

d) limestone, sodium carbonate and silica

Question : 10

Glass is actually

a) an elastic solid

b) an ionic solid

c) a crystalline solid

d) a vitrified liquid