Building Materials MCQs

Question 1

In order of increasing percentage of silica, the correct sequence is

Accepted Answer

calcareous clay, pure clay, sandy clay

Answer

sandy clay, calcar(tous clay, pure clay

Answer

pure clay, sandy clay, calcareous clay

Answer

None of these.

Question 2

Pick up the correct statement from the following :

Accepted Answer

All the above.

Answer

The percentage of absorption for fire-bricks varies from 5 to 10

Answer

The percentage of silica in silica bricks is to the extent of about 95 to 97 percent

Answer

Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material

Question 3

Pick up the correct statement from the following:

Accepted Answer

All the above.

Answer

The heating of a material to redness in contact with air, is known as calcinations

Answer

The property of lime by which it sets or hardens in damp places having no free circulation of ail. is Called setting

Answer

The product that remains after calcination oflimestone, is called lime

Question 4

Pick up the compound responsible for early strength of cement from the following :

Accepted Answer

Tricalcium silicate

Answer

Tetra-calcium alumino-ferrite

Answer

Tricalcium aluminate

Answer

Dicalcium silicate.

Question 5

In the cement the compound quickest to react with water, is

Accepted Answer

Tricalcium aluminate

Answer

Tetra-calcium aluxnino-ferrite

Answer

Tricalcium silicate

Answer

Dicalcium silicate.

Question 6

When a brick is immersed in water for 24 hours and then dried, if

Accepted Answer

All the above.

Answer

no grey or white deposits appear on the surface, the brick is free from soluble salts

Answer

10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence

Answer

50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence

Question 7

Rapid hardening cement contains

Accepted Answer

Tr-calcium silicate

Answer

Tr-calcium aluminate

Answer

Tetra-calcium alumino-ferrite

Answer

Dicalcium silicate.

Question 8

Name the type of cement from the following for canal linings :

Accepted Answer

sulphate resisting cement

Answer

rapid hardening cement

Answer

quick setting cement

Answer

pozzuolana cement.

Question 9

If water required for 1 bag of cement is 30 litres, the water cement ratio is :

Accepted Answer

0.6

Answer

0.4

Answer

0.5

Answer

None of these.