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

Question : 6

When glass is heated, it

a) melts only above 1000°C

b) vapourises

c) does not melt at a fixed temperature

d) None of these

Question : 7

Which one of the following is not contained in portland cement ?

a) Ca₂ SiO₄

b) Ca₃ SiO₅

c) Ca₃Al₂O₆

d) Ca₃ (PO₄)₂

Question : 8

Soft soaps are

a) potassium salt of fatty acids

b) sodium salt of fatty acids

c) sodium and potassium salt

d) potassium salt of sulphonic acids

Question : 9

Which substance is used to retard the setting action of cement?

a) CaSO₄ , 2H₂O

b) Al₂O₃

c) CaO

d) Na₂O + K₂O

Question : 10

Washing soap can be prepared by saponification with alkali of which of the following oil

a) Groundnut oil

b) Paraffin oil

c) Rose oil

d) Kerosene oil