Concrete Technology MCQs

Question 1

Water cement ratio is

Accepted Answer

both A and B of the above

Answer

volume of water to that of cement

Answer

weight of water to that of cement

Answer

weight of concrete to that of water

Question 2

Water cement ratio is generally expressed in volume of water required per

Accepted Answer

50 kg

Answer

10 kg

Answer

20 kg

Answer

30 kg

Question 3

Pick up the incorrect statement from the following :

Accepted Answer

A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive ?quantity of water

Answer

The strength of concrete decreases as the water cement ratio increases

Answer

If the water cement ratio is less than 045, the concrete is not workable and causes honey-combed structure

Answer

Good compaction by mechanical vibrtions, increases the strength of concrete

Question 4

According to Water-Cement Ratio Law, the strength of workable plastic concrete

Accepted Answer

all the above

Answer

depends upon the amount of water used in the mix

Answer

does not depend upon the quality of cement mixed with aggregates

Answer

does not depend upon the quanity of cement mixed with aggregates

Question 5

The condition not applicable to water cement ratio law, is

Accepted Answer

concrete specimens may be tested at any temperature

Answer

internal moisture conditions on hydration continue till complete strength is gained

Answer

concrete specimens need be of same age

Answer

concrete specimens need be of same size

Question 6

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

The concrete gains strength due to hydration of cement

Answer

The concrete cured at a temperature below 23?C, gains strength up to 28 days

Answer

The concrete does not set at freezing point

Question 7

The datum temperature for maturity by Plowman, is

Accepted Answer

117?C

Answer

23?C

Answer

0?

Answer

( c) - 56?C

Question 8

Hydration of cement is due to chemical action of water with

Accepted Answer

All the above

Answer

Tricalcium silicate and dicalcium silicate

Answer

Dicalcium silicate and tricalcium aluminate

Answer

Tricalcium aluminate and tricalcium alumino ferrite

Question 9

Ilardening of cement occurs at

Accepted Answer

none of these

Answer

rapid rate during the first few days and afterwards it continues to increase at a decreased rate

Answer

slow rate during the first few days and afterwards it continues to increase at a rapid rate

Answer

uniform rate throughout its age