Concrete Technology MCQs

Question 1

Segregation is responsible for

Accepted Answer

all the above

Answer

honey-combed concrete

Answer

porous layers in concrete

Answer

surface scaling in concrete

Question 2

The concrete mix which causes difficulty in obtaining a smooth finish, possess

Accepted Answer

hardness

Answer

segregation

Answer

internal friction

Answer

bleeding

Question 3

The factor which affects workability, is

Accepted Answer

all the above

Answer

water content and its temperature

Answer

shape and size of the aggregates

Answer

grading and surface textures of the aggregates

Question 4

Pick up the correct statement from the following :

Accepted Answer

All the above

Answer

An increase in water content must be accompanied by an increase in cement content

Answer

Angular and rough aggregates reduce the workability of the concrete

Answer

Large size aggregates increase the workability due to lesser surface area

Question 5

The top diameter, bottom diameter and the height of a slump mould are :

Accepted Answer

10 cm, 20 cm, 30 cm

Answer

10 cm, 30 cm, 20 cm

Answer

20 cm, 10 cm, 30 cm

Answer

20 cm, 30 cm, 10 cm

Question 6

Pick up the incorrect statement from the following :

Accepted Answer

The mould is in the form of a frustum of hexagonal pyramid

Answer

The bottom and top ends of slump mould are parallel to each other

Answer

The axis of the mould is perpendicular to the end faces

Answer

The internal surface of the mould is kept clean and free from set cement

Question 7

If the slump of a concrete mix is 60 mm, its workability is

Accepted Answer

medium -

Answer

very low

Answer

low

Answer

high

Question 8

Workability of concrete ratio is determined by

Accepted Answer

compaction factor test

Answer

tensile strength test

Answer

slump test

Answer

flexural strength test

Question 9

In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for

Accepted Answer

25 times

Answer

20 times

Answer

30 times

Answer

40 times