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

some important man made materials PRACTICE TEST [2 - EXERCISES]

set 1

set 2

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

Answer: (c)

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

Answer: (d)

A typical composition for portland cement is CaO, SiO2, Al2O3, Fe2O3, CaSO4 .2H2O.

∴ Ca3 (PO4)2 is not contained in portland cement.

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

Answer: (a)

Question : 9

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

a) CaSO4 , 2H2O

b) Al2O3

c) CaO

d) Na2O + K2O

Answer: (a)

CaSO4 . 2H2O (gypsum) is added to cement clinker to retard setting action of cement.

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

Answer: (a)

Any oils which are good for eating or cooking, can be used in making soap. One of the best is said to be Coconut oil. Groundnut, shea butter, cocoa butter, sun flower and many other vegetable oils are also used.

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