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Concrete Technology
mcqs by everyone
The maximum percentage of chemical ingredient of cement is that of
magnesium oxide
Silica.
Iron oxide
Aluminium
lime
Slump test of concrete is a meausre ofits
Compressive strength
Tensile strength
consistency
impact value.
The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known
batching
None of these.
curing
Grading
mixing
Segregation is responsible for
sand streaks in concrete
surface scaling in concrete
honey-combed concrete
porous layers in concrete
All the above.
Pozzolanic properties exist in
pumicite
shales
Fly ash
All the above.
diatomaceous clay
For given water content, workability decreases if the concrete aggregates contain an excess of
All the above.
flat particles
thin particles
elongated particles
flaky paticles
Batching error means inaccuracy in the quantity of
aggregates
All the above.
Cement
Water
Pick up the correct statement from the following i
All the above.
Higher workability indicates deficiency of sand
Concrete mix having zero slump, is unsuitable for high strength.
Higher workability indicates unexpected increase in the moisture content
If the concrete mix is dry, the slump is zero
M10 grade of concrete approximates
None of these.
1 : 1.5 : 3 mix
1 : 1 : 2 mix
1 : 3 : 6 mix
1 : 2 : 4 mix
Strength of concrete with passage of time
Decreases
remains constant.
Increases
fluctuates
According to IS : 382-1963, a good aggregate should be
All the above.
hard and durable
sufficiently strong
chemically inert
For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is
16 kg
14 kg
10 kg
20 kg
12 kg
The light weight aggregates are obtained from
volcanic source.
Metamorphic rocks
igneous rocks
Sedimentary rocks
While designing an air entrained concrete
strength of the concrete, is reduced
proportion of aggregates is reduced
All the above.
an allowance for the entrained air is made
water cement ratio is reduced
Sands of zone I are
fine.
Medium
coarse
medium to fine
The commonly used material in the manufacture of cement is
sand stone
graphite.
Lime stone
Slate
The final operation of finishing floors, is known as
trowelling
screeding
finishing
All the above.
floating
The maximum thickness of concrete floor of a cement warehouse, is
20 cm
10 cm
25 cm
30 cm
15 cm
The produce impermeable concrete
All the above.
proper curing of concrete is required
proper compaction of concrete is required
properly graded and non-porous aggregates are requied
thorough mixing of concrete is required
A concrete using an air entrained cement
has more resistance to weathering
All the above.
has strength less than 10% to 15%
is free from segregation and bleeding
is more plastic and workable
C.R.R.
I. charts are used to obtain a relatioship between strength of concrete and
None of these.
Workability
fineness modulus
grading of aggregate
water cement ratio
For given workability the grading requiring the least amount of water is one that gives
None of these.
greatest weight for the given cement and aggregates
least surface area for the given cement and aggregates
least weight for the given cement and aggregates
greatest surface area for the given cement and aggregates
The ratio of the length to breadth of a wooden float, is
4.5
5.5
6.5
7.5
8.5
The ratio of various ingredients
(cement, sand, aggregates) in concrete of grade M 200, is
1 : 1 : 2
4 : 2 : 1
1 : 3 : 6
1 : 2 : 4
The high strength of rapid hardening cement at early stage, is due to its
burning at high temperature
increased lime cement
higher content of tricalcium.
finer grinding
To hydrate 500kg of cement full water needed, is
140 kg
130 kg
120 kg
110 kg
100 kg
The size of fine aggregates does not exceed
3.75 mm
5.75 mm
4.75 mm
3.00 mm
2.75 mm
The commercial name of white and coloured cement in India, is
rainbow cement
All the above.
snowcem
colocrete
silvicrete
The specifications of a cement bag for storage, are
height 18 cm
plan area 3000 sq. cm
All the above.
volume 35 litres
weight 50 kg
Water required per bag of cement, is
21 kg
7 kg
28 kg
35 kg
14 kg
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