Practice Concrete Technology Multiple Choice Questions with Answers Quiz-5

Q.1.

For preparing ordinary concrete, the quantity of water used, is

5% by weight of aggregates plus 20% of weight of cement
10% by weight of aggregates plus 10% of weight of cement
5% by weight of aggregates plus 30% of weight of cement
30% by weight of aggregates plus 10% of weight of cement
none of these.

Q.2.

Vicat apparatus is used for

fineness test
consistency test
test for setting time
test for tensile strength
none of these.

Q.3.

Water cement ratio is generally expressed in volume of water required per

10 kg
20 kg
30 kg
40 kg
50 kg

Q.4.

Sand requiring a high water cement ratio, belongs to

Zone I
Zone II
Zone III
Zone IV.

Q.5.

Pick up the correct statement from the following:

The quality of water governs the strength of concrete
The quantity of water required for concreting, depends upon the grading of aggregate amd method of compaction
10% excess of water reduces the strength of concrete by 15%
30% excess of water reduces the strength of concrete by 50%
All the above.

Q.6.

The specifications of a cement bag for storage, are

all the above.
weight 50 kg
height 18 cm
plan area 3000 sq. cm
volume 35 litres

Q.7.

In the method of voids for determination of the quantity of cement paste, it is assumed that

Voids in coarse aggregates are filled by fine aggregates
Voids in fine aggregates are filled by the cement paste
Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
Volume of cement paste required is equal to total volume of voids in fine aggregates plus 15% extra
All the above.

Q.8.

The surface where two successive placements of concrete meet, is known as

Contraction joint
Expansion joint
Construction joint
both (a) and (b)
both (6) and (c).

Q.9.

Pick up the correct statement from the following:

Continuous grading is not necessary for obtaining a minimum of air voids
The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
All the above.

Q.10.

Pick up the correct statement from the following:

Construction joints in columns are provided a few cm below the junction of beam
Construction joints in columns are provided at the bottom haunching
Construction joints in beams and slabs are provided within middel third
Constructionjoints are generally provided in positions subjected to least shear force
All the above.

Q.11.

The maximum percentage of chemical ingredient of cement is that of

magnesium oxide
iron oxide
aluminium
lime
silica.

Q.12.

The void ratio of

single size coarse aggregate is roughly 0.45.
graded coarse aggregate is roughly 0.040
fine aggregate is roughly 0.45
all the above.

Q.13.

Particles of 0.mm size are that of

clay
sand
gravel
none of these.

Q.14.

If a grading curve is horizontal bet-wen the portions ofmm I.S. Sieve and 4.mm I.S. Sieve, the graded aggregates do not contain

20 mm particles
10 mm particles
4.75 mm particles
all the above.

Q.15.

Di-calcium silicate (C₂S)

hydrates rapidly
generates less heat of hydration
hardens rapidly
provides less ultimate strength to cement
has less resistance to sulphate attack.

Q.16.

For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is

10 kg
12 kg
14 kg
16 kg
20 kg

Q.17.

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

rounded aggregate
irregular aggregate
angular aggregate
flaky aggregate
none of these.

Q.18.

An ideal ware house, is provided

water proof masonry walls
water proof roof
few windows which remain generally closed
15 cm thick concrete floor laid on a dry course of soling
all the above.

Q.19.

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

rounded aggregate
irregular aggregate
angular aggregate
flaky aggregate
none of these.

Q.20.

Pick up the correct statement from the following:

Calcium chloride acts as a retarder
Gypsum (calcium sulphate) acts as an accelerator
Gypsum (calcium sulphate) acts as a retarder
Calcium chloride acts as an accelerator
Both (c) and (d).

Q.21.

Slump test of concrete is a meausre ofits

consistency
compressive strength
tensile strength
impact value.

Q.22.

Joints in concrete structures, are provided

to reduce the tensile stresses likely to be developed due to evaporation of water
to minimise the change in the dimensions of the slab
to minimise the necessary cracking
all the above.

Q.23.

According to Water-Cement Ratio Law, the strength of workable plastic concrete

depends upon the amount of water used in the mix
does not depend upon the quality of cement mixed with aggregates
does not depend upon the quanity of cement mixed with aggregates
all the above.

Q.24.

If the engineer-in-charge approves, thecm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

10 cm
15 cm
20 cm
25 cm
30 cm

Q.25.

The aggregate containing moisture in pores and having its suface dry, is known as

moist aggregates
very dry aggregates
dry aggregates
saturated surface dry aggregate
none of these.

Q.26.

The bulk density of aggregates, is generally expressed as

tonnes/cubic metre
kg/cubic metre
kg/litre
g/cm³
none of these.

Q.27.

The factor which affects workability, is

water content and its temperature
shape and size of the aggregates
grading and surface textures of the aggregates
air entraining agents
all the above.

Q.28.

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer oflitre capacity, is

15, 900 litres
16, 900 litres
17, 900 litres
18, 900 litres

Q.29.

An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No.more than

5%
10%
15%
20%
25%

Q.30.

Permissible compressive strength of Mconcrete grade is

100 kg/cm²
150 kg/cm²
200 kg/cm²
250 kg/cm²
300 kg/cm²

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