Concrete Technology MCQs

Question 1

Construction joints are generally provided in concrete

Accepted Answer

all the above

Answer

roads

Answer

retaining walls

Answer

lining of canals

Question 2

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

Construction joints are necessarily planned for their locations

Answer

Expansion joints are provided to accommodate thermal expansion

Answer

Construction joints are provided to control shrinkage cracks

Question 3

An aggregate which passes through 25 mm IS sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than

Accepted Answer

135 mm

Answer

225 mm

Answer

185 mm

Answer

165 mm

Question 4

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

Accepted Answer

rounded aggregate

Answer

irregular aggregate

Answer

angular aggregate

Answer

flaky aggregate

Question 5

Workability of concrete for a given watercentent is good if the aggregates, are

Accepted Answer

rounded aggregate

Answer

irregular aggregate

Answer

angular aggregate

Answer

flaky aggregates

Question 6

An excess of flaky particles in concrete aggregates

Accepted Answer

all the above

Answer

decreases the workability

Answer

increases the quantity of water and sand

Answer

affects the durability of concrete

Question 7

A flaky aggregate is said to be elongated if its length is

Accepted Answer

twice the mean size

Answer

equal to the mean size

Answer

thrice the mean size

Answer

four times the mean size

Question 8

An aggregate is said to be flaky if its least dimension is less than

Accepted Answer

3/5th of mean dimension

Answer

1/5th of mean dimension

Answer

2/5th of mean dimension

Answer

4/5th of mean dimension

Question 9

For given water content, workability decreases if the concrete aggregates contain an excess of

Accepted Answer

all the above

Answer

thin particles

Answer

flat particles

Answer

elongated particles