Building Materials MCQs

Question 1

The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is

Accepted Answer

0

Answer

20

Answer

15

Answer

10

Question 2

The initial setting time of hydraulic lime, is

Accepted Answer

120 minutes

Answer

30 minutes

Answer

60 minutes

Answer

90 minutes

Question 3

The initial setting time of lime-pozzolona, is

Accepted Answer

120 minutes.

Answer

30 minutes

Answer

60 minutes

Answer

90 minutes

Question 4

The normal curing period for lime mortar, is :

Accepted Answer

7 days

Answer

one day

Answer

3 days

Answer

10 days

Question 5

For lime concrete,

Accepted Answer

all the above.

Answer

slump is 50 to 75 mm

Answer

flexural strength at 90 days is 0.2 N/mm2

Answer

compressive strength at 90 days is 1.5 N/mm2

Question 6

Plaster of Paris is obtained by calcining

Accepted Answer

gypsum

Answer

bauxite

Answer

kankar

Answer

lime stone

Question 7

For the manufacture of Portland cement, the proportions of raw materials used, are

Accepted Answer

lime 63% ; silica 22% ; other ingredients 15%

Answer

silica 22% ; lime 60%; other ingredients 18%

Answer

silica 40% ; lime 40%; other ingredients 20%

Answer

silica 70% ; lime 20% ; other ingredients 10%.

Question 8

Good quality cement contains higher percentage of

Accepted Answer

Tricalcium silicate

Answer

Di-calcium silicate

Answer

Tr-calcium aluminate

Answer

Tetra calcium alumino ferrite

Question 9

Initial setting of cement is caused due to

Accepted Answer

Tr-calcium aluminate

Answer

Tr-calcium silicate

Answer

Di-calcium silicate

Answer

Tetra calcium alumino ferrite.