CONCRETE TECHNOLOGY IS A VERY IMPORTANT SUBJECT OF CIVIL ENGINEERING AND IT IS USEFUL ALL THE TIMES AS WELL AS IN FIELD.IF YOU WANT TO CRACK ANY JOB INTERVIEW OR WRITTEN EXAM OF ANY PSU, PSC, SSC THEN YOU HAVE TO A GREAT KNOWLEDGE IN CONCRETE TECHNOLOGY IS HELP YOU IN DESIGN OF RCC,CONSTRUCTION ETC.
HERE YOU GET MCQ ON CONCRETE TECHNOLOGY
CLICK HERE TO PART-2
1 Water cement ratio is the ratio of
[ A ] Water to cement by weight
[ B ] Water to cement by volume
[ C ] Cement to water by weight
[ D ] Cement to water by volume
Answer : A
[ A ] Water to cement by weight
[ B ] Water to cement by volume
[ C ] Cement to water by weight
[ D ] Cement to water by volume
Answer : A
2 Concrete is
[ A ] Weak in tension
[ B ] Strong in tension
[ C ] Strong in both tension and compression
[ D ] Weak in compression
Answer : A
[ A ] Weak in tension
[ B ] Strong in tension
[ C ] Strong in both tension and compression
[ D ] Weak in compression
Answer : A
3 The entrained air in concrete
[ A ] Increases the strength
[ B ] Decreases the resistance to weathering
[ C ] Increases the workability
[ D ] Decreases the workability
Answer : C
4 Concrete is unsuitable for compaction by vibration if it is
[ A ] Increases the strength
[ B ] Decreases the resistance to weathering
[ C ] Increases the workability
[ D ] Decreases the workability
Answer : C
4 Concrete is unsuitable for compaction by vibration if it is
[ A ] Semi – plastic [ B ] Plastic [ C ] Earth moist [ D ] Dry
Answer : B
5 The strength and quality of concrete depends upon
(i)Grading of aggregates
(ii)Shape of aggregates
(iii)Surface area of aggregates
(iv)Surface texture of aggregates
[ A ] i, ii and iv [
B ] ii, iii and iv [ C ] i, iii and iv [ D ]
i, ii, iii and iv
Answer : D
6 In order to avoid segregation, fresh concrete should be
dropped from a height of
[ A ] Less than one
meter [ B ]
Less than two metres
[ C ] More than one
metre [ D ] More than two metres
Answer : A
7 The process of hardening of concrete in the presence of
water is called
[ A ] Creep [ B ] Hydration [ C ] Shrinkage [ D ] Curing
Answer : B
8 The process of keeping the concrete structure moist is
called
[ A ] Hydration [ B ] Curing [ C ] Creep [ D ] Shrinkage
Answer : B
9 The separation of water or water cement mixture from the
freshly laid concrete is known as
[ A ] Workability [ B ] Segregation [ C ] Bleeding [ D ] Creep
Answer : C
10 The continuous strain, which the concrete undergoes due
to application of external loads is called
[ A ] Creep [ B ] Bleeding [ C ] Workability [ D ]
Segregation
Answer : A
11 The process of conversion of plastic concrete to solid
stage is called
[ A ] Hydration [ B ] Hardening [ C ] Setting [ D ] Curing
Answer : C
At 28 days of curing concrete attains a strength of
[ A ] 20 to 25% [ B ] 60 to 70% [ C ] 65 to 80% [ D ] 90 to
95%
Answer : D
12 In a mass concrete, the aggregates occupy a space of
[ A ] 25% [ B ] 75% [ C ] 40% [ D ] 60%
Answer : B
13 The coarse aggregate which possess the property of good
interlocking are
[ A ] rounded shape [ B ] elongated shape [ C ] angular
shape [ D ] none of the above
Answer : C
14 While placing of concrete the thickness of each layer for R.C.C. is
14 While placing of concrete the thickness of each layer for R.C.C. is
[ A ] 150 to 300 mm [ B ] 450 mm [ C ] 500 to 750 mm [ D ]
500 mm Answer : A
15 Increase in water content in a cement concrete
(i)
Increases workability
(ii)
Increases the strength
[ A ] i [ B ] ii [ C ] both (i)
and (ii) [ D ] neither (i) nor (ii)
Answer : A
16 Slump cone test is used to
determine
[ A ] Shrinkage of concrete mix [
B ] Creep of concrete
[ C ] Workability of concrete mix [ D ] Soundness of
concrete
Answer : C
17 While determining the
workability of concrete mix, the compaction factor test is ------than the slump
cone test
[ A ] Less accurate [ B ] More accurate [ C ]
Approximate method [ D ] None of the above
Answer : B
18 Workability of concrete mix
with low water cement ratio is determined by
[ A ] Tensile strength test [ B ]
Slump cone test
[ C ] Compaction factor test [ D ] Flexural strength test
Answer : C
19 If the slump of a concrete mix
is 50 to 100 mm, its workability
[ A ] Very low [ B ] Low [ C ] Medium [ D ]
HigH
Answer : C
20 A compaction factor of 0.75
indicates ________workability
[ A ] Very low [ B ] Low [ C ] Medium
[ D ] High
Answer : A
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