Concrete Technology MCQs

Question 1

Pick up the correct statement from the following:

Accepted Answer

All the above

Answer

The property of expanding rocks more in direction parallel to one crystallograhic axis than another is called anisotropic property

Answer

The most anisotropic rock is calcite

Answer

The coefficeint of thermal expansion of aggregae is of prime importance for fire resistance of concrete

Question 2

The flankiness index of aggregates is the percentage by weight of particles in it whose thickness is less than

Accepted Answer

3/5th of mean length

Answer

2/5th of mean length

Answer

4/5th of mean length

Answer

none of these

Question 3

Sea water:

Accepted Answer

all the above

Answer

contains a salinity of about 35 percent

Answer

corrodes the reinforcement of R0

Answer

acceleraes the setting time of cement

Question 4

Which one of the following pro; rties of plastic concrete is modified by the air-entraining agt-its

Accepted Answer

all of these

Answer

workability

Answer

segregation

Answer

bleeding

Question 5

Common sugar can be suitably used:

Accepted Answer

to delay the setting time of concrete

Answer

to accelerate the setting time of concrete

Answer

to increase the strength of concrete

Answer

none of these

Question 6

Which one of the following materials is used as a bonding admixture

Accepted Answer

All of these

Answer

natural rubber

Answer

synthetic rubber

Answer

organic polymers

Question 7

Pick up the correct dimensions of the mould for slump test from the following:(Top-Bottom diameter-Height diameter)

Accepted Answer

10-20-30

Answer

20-30-10

Answer

30-10-20

Answer

20-30-40

Question 8

Pick up the correct statement from the following: Drying shrinkage is affected by

Accepted Answer

All the above

Answer

the relative humidity of the atfriosphere when the concrete is placed

Answer

the length of time

Answer

the water/cement ratio of the concrete

Question 9

No shrinkage occurs if the concrete is placed in a relative humidity of

Accepted Answer

100 percent

Answer

85 percent

Answer

70 percent

Answer

50 percent