Concrete Technology MCQs

Question 1

To obtain a very high strength concrete, use very fine grained

Accepted Answer

Granite

Answer

Magnetite

Answer

Barite

Answer

Volcanic scoria

Question 2

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

Sand obtained from pits, is washed to remove clay and silt

Answer

Sand obtained from flooded pits, need not be washed before use

Answer

Sea shore sand contains chlorides which cause effloresance

Question 3

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones

Answer

Concrete using sand stones, cracks due to excessive shrinkage

Answer

Very hard and close grained crystallined lime stones are suitable aggregates but provide low strength

Question 4

Saw dust can be rendered chemically inert by boiling it in water containing

Accepted Answer

ferrous sulphate

Answer

potassium chloride

Answer

ammonia

Answer

nitric acid

Question 5

For given workability the grading requiring the least amount of water is one that gives

Accepted Answer

greatest surface area for the given cement and aggregates

Answer

least surface area for the given cement and aggregates

Answer

least weight for the given cement and aggregates

Answer

greatest weight for the given cement and aggregates

Question 6

Sand requiring a high water cement ratio, belongs to

Accepted Answer

Zone I

Answer

Zone II

Answer

Zone III

Answer

Zone IV

Question 7

Sands of zone I are

Accepted Answer

coarse

Answer

medium

Answer

medium to fine

Answer

fine

Question 8

Pick up the incorrect statement from the following :

Accepted Answer

In single size aggregates, bulk density is maximum

Answer

In properly graded aggregates, bulk density is more

Answer

In single size aggregates, bulk density is least

Answer

None of these

Question 9

The bulk density of aggregates, depends upon

Accepted Answer

all the above

Answer

shape

Answer

grading

Answer

compaction