Concrete Technology MCQs

Question 1

Slump test of concrete is a meausre of its

Accepted Answer

consistency

Answer

compressive strength

Answer

tensile strength

Answer

impact value

Question 2

ISI has specified full strength of concrete after

Accepted Answer

none of these

Answer

7 days

Answer

14 days

Answer

21 days

Question 3

Strength of concrete with passage of time

Accepted Answer

increases

Answer

decreases

Answer

fluctuates

Answer

remains constant

Question 4

Concrete gains strength due to

Accepted Answer

hydration of cement

Answer

chemical reaction of cement with sand and coarse aggregates

Answer

evaporation of water from concrete

Answer

All the above

Question 5

Pick up the correct statement the following:

Accepted Answer

all the above

Answer

Ordinary portland cement is susceptible to the attack of magneisum sulphate

Answer

In set-cement, sulphates reactwiththe free calcium hydroxide to form calcium sulphate

Answer

Solid sulphates do not attck the cement compound

Question 6

For the preparaton of lowheat cement, the contents of

Accepted Answer

C3S and C3A are reduced and content of C2S is increased

Answer

C2S and C3S are reduced and content of C3S is increased

Answer

C3A and C2S are reduced and that of C3S is increased

Answer

C2S, C3S and C3A are reduced

Question 7

Vicat apparatus is not sued for

Accepted Answer

compressive strength of cement

Answer

normal consistency test of cement

Answer

initial setting time of cement

Answer

final seting time of cement

Question 8

Pick up the wrong specification of Vicat apparatus from the following:

Accepted Answer

Length of the Vicat plungr-50 mm

Answer

Diameter of Vicat mould-80 mm

Answer

Height of Vicat mould-40 mm

Answer

Diameter of the Vicat plunger -10 mm

Question 9

The initial setting time of ordinary port land cement should be:

Accepted Answer

less than 30 minutes

Answer

30 minutes

Answer

more than 30 minutes

Answer

None of the above