Concrete Technology MCQs

Question 1

ISI has specified the full strength of concrete after

Accepted Answer

28 days

Answer

7 days

Answer

14 days

Answer

21 days

Question 2

High temperature

Accepted Answer

decreases the strength of concrete

Answer

increases the strength of concrete

Answer

has no effect on the strength of concrete

Answer

none of these

Question 3

Placing of concrete should preferably be done at temperature of

Accepted Answer

27 ? 2?C

Answer

0?C

Answer

10?C

Answer

20?C

Question 4

Water required per bag of cement, is

Accepted Answer

35 kg

Answer

7 kg

Answer

14 kg

Answer

21 kg

Question 5

CRR1 charts are used to obtain a relatioship between strength of concrete and

Accepted Answer

water cement ratio

Answer

workability

Answer

grading of aggregate

Answer

fineness modulus

Question 6

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

Water enables chemical reaction to take place with cement

Answer

Water lubricates the mixture of gravel, sand and cement

Answer

Only a small quantity of water is required for hydration of cement

Question 7

Higher workability of concrete is required if the structure is

Accepted Answer

thick and heavily reinfored

Answer

made with cement concrete

Answer

thick and reinforced

Answer

thin and heavily reinforced

Question 8

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

Higher workability indicates unexpected increase in the moisture content

Answer

Higher workability indicates deficiency of sand

Answer

If the concrete mix is dry, the slump is zero

Question 9

Internal friction between the ingredients of concrete, is decreased by using

Accepted Answer

more water and coarse aggregates

Answer

less water

Answer

fine aggregates

Answer

rich mix