320+ Concrete Technology and Design Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .

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201.	Shrinkage in concrete can be reduced by using
A.	low water cement ratio
B.	less cement in the concrete
C.	proper concrete mix
D.	all the above
Answer» D. all the above

discuss

202.	The shuttering of a hall measuring 4 m × 5 m, can be removed after
A.	5 days
B.	7 days
C.	10 days
D.	14 days
Answer» B. 7 days

discuss

203.	The approximate value of the ratio between direct tensile strength and flexural strength is
A.	0.33
B.	0.5
C.	0.75
D.	1.0
Answer» B. 0.5

discuss

204.	An aggregate is said to be flaky if its least dimension is less than
A.	1/5th of mean dimension
B.	2/5th of mean dimension
C.	3/5th of mean dimension
D.	4/5th of mean dimension
Answer» C. 3/5th of mean dimension

discuss

205.	Workability improved by adding
A.	fly ash
B.	hydrated lime
C.	calcium chloride
D.	all the above
Answer» D. all the above

discuss

206.	Workability of concrete is inversely proportional to
A.	time of transit
B.	water-cement ratio
C.	the air in the mix
D.	size of aggregate
Answer» A. time of transit

discuss ⁽¹⁾

207.	Inert material of a cement concrete mix, is
A.	water
B.	cement
C.	aggregate
D.	none of these
Answer» C. aggregate

discuss

208.	If a beam fails in bond, then its bond strength can be increased most economically by
A.	increasing the depth of beam
B.	using thinner bars but more in number
C.	using thicker bars but less in number
D.	providing vertical stirrups
Answer» B. using thinner bars but more in number

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209.	Pick up the incorrect statement from the following:
A.	a rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water
B.	the strength of concrete decreases as the water cement ratio increases
C.	good compaction by mechanical vibrations, increases the strength of concrete
D.	none of these
Answer» A. a rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water

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210.	Ordinary Portland cement is manufactured from
A.	lime stone and clay
B.	gypsum and lime
C.	pozzolana
D.	lime, pozzolana and clay
Answer» B. gypsum and lime

discuss

211.	The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than
A.	0.15
B.	0.12
C.	0.30
D.	1.00
Answer» B. 0.12

discuss

212.	Addition of pozzolana to cement
A.	decreases workability
B.	increases strength
C.	increases heat of hydration
D.	none of these
Answer» D. none of these

discuss

213.	If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is
A.	8 kg
B.	10 kg
C.	12 kg
D.	14 kg
Answer» C. 12 kg

discuss

214.	The minimum cover to the ties or spirals should not be less than
A.	15 mm
B.	20 mm
C.	25 mm
D.	50 mm
Answer» C. 25 mm

discuss

215.	According to Water-Cement Ratio Law, the strength of workable plastic concrete
A.	depends upon the amount of water used in the mix
B.	does not depend upon the quality of cement mixed with aggregates
C.	does not depend upon the quantity of cement mixed with aggregates
D.	all the above
Answer» D. all the above

discuss

216.	Sands of zone I are:
A.	course
B.	medium
C.	medium to fine
D.	fine
Answer» A. course

discuss

217.	According to Whitney's theory, ultimate strain of concrete is assumed to be
A.	0.03 %
B.	0.1 %
C.	0.3 %
D.	3 %
Answer» C. 0.3 %

discuss

218.	The condition not applicable to water cement ratio law, is
A.	internal moisture conditions on hydration continue till complete strength is gained
B.	concrete specimens may be tested at any temperature
C.	concrete specimens need be of same age
D.	concrete specimens need be of same size
Answer» B. concrete specimens may be tested at any temperature

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219.	If the slump of a concrete mix is 60 mm, its workability is
A.	very low
B.	low
C.	medium
D.	high
Answer» C. medium

discuss

220.	Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than
A.	35 mpa and 42 mpa
B.	42 mpa and 35 mpa
C.	42 mpa and 53 mpa
D.	53 mpa and 42 mpa
Answer» B. 42 mpa and 35 mpa

discuss

221.	The void ratio of
A.	single size coarse aggregate is roughly 0.45
B.	graded coarse aggregate is roughly 0.040
C.	fine aggregate is roughly 0.45
D.	all the above
Answer» D. all the above

discuss

222.	According to IS : 382-1963, a good aggregate should be
A.	chemically inert
B.	sufficiently strong
C.	hard and durable
D.	all the above
Answer» D. all the above

discuss

223.	The compressive strength of 100 mm cube as compared to 150 mm cube is always
A.	less
B.	more
C.	equal
D.	none of the above
Answer» B. more

discuss

224.	The diameter of the Vicat plunger is 10 mm and its length varies from
A.	20 mm to 30 mm
B.	30 mm to 40 mm
C.	40 mm to 50 mm
D.	50 mm to 60 mm
Answer» C. 40 mm to 50 mm

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225.	Gypsum is added for
A.	colour
B.	strength
C.	controlling setting time
D.	none of these
Answer» C. controlling setting time

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226.	Modulus of elasticity of steel as per IS: 4561978 shall be taken as
A.	20 kn/cm²
B.	200 kn/cm²
C.	200 kn/mm²
D.	2 × 106 n/cm²
Answer» C. 200 kn/mm²

discuss

227.	The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
A.	100 kg/cm2
B.	150 kg/cm2
C.	200 kg/cm2
D.	250 kg/cm2
Answer» B. 150 kg/cm2

discuss

228.	The cement becomes useless if its absorbed moisture content exceeds
A.	1 %
B.	2 %
C.	3 %
D.	5 %
Answer» D. 5 %

discuss

229.	In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
A.	100 mm
B.	150 mm
C.	200 mm
D.	250 mm
Answer» B. 150 mm

discuss

230.	For preparing a test-specimen, it is necessary
A.	to mix cement and fine aggregate by dry hand
B.	to mix coarse aggregates
C.	to mix water to the cement, fine aggregates and coarse aggregates
D.	all the above
Answer» D. all the above

discuss

231.	For a good concrete
A.	aggregates should be hard and durable
B.	water should be free from organic materials
C.	cement should be sufficient to produce the required strength
D.	all the above
Answer» D. all the above

discuss

232.	The process of hardening the concrete by keeping its surface moist is known
A.	placing
B.	wetting
C.	curing
D.	compacting
Answer» C. curing

discuss

233.	For the construction of the retaining structures, the type of concrete mix to be used, is
A.	1 : 3 : 6
B.	1 : 2 : 4
C.	1 : 1½ : 3
D.	1 : 4 : 8
Answer» C. 1 : 1½ : 3

discuss

234.	The produce impermeable concrete
A.	thorough mixing of concrete is required
B.	proper compaction of concrete is required
C.	proper curing of concrete is required
D.	all the above
Answer» D. all the above

discuss

235.	Pozzolanic properties exist in
A.	shales
B.	fly ash
C.	pumicite
D.	all the above
Answer» D. all the above

discuss

236.	A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than
A.	1.5
B.	2.0
C.	2.5
D.	3.0
Answer» C. 2.5

discuss

237.	Pick up the correct statement from the following:
A.	the weight of ingredients of concrete mix, is taken in kilograms
B.	water and aggregates are measured in litres
C.	20 bags of cement make one tonne
D.	all the above
Answer» D. all the above

discuss

238.	If fineness modulus of sand is 2.5, it is graded as
A.	very fine sand
B.	fine sand
C.	medium sand
D.	coarse sand
Answer» B. fine sand

discuss

239.	Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
A.	28 liters
B.	30 liters
C.	32 liters
D.	34 liters
Answer» C. 32 liters

discuss

240.	The increased cohesiveness of concrete, makes it
A.	less liable to segregation
B.	more liable to segregation
C.	more liable to bleeding
D.	more liable for surface scaling in frosty weather
Answer» A. less liable to segregation

discuss

241.	Concrete is unsuitable for compaction by a vibrator if it is
A.	dry
B.	earth moist
C.	semi-plastic
D.	plastic
Answer» D. plastic

discuss

242.	In order to obtain the best workability of concrete, the preferred shape of aggregate is
A.	rounded
B.	elongated
C.	angular
D.	all of the above
Answer» A. rounded

discuss

243.	Hydration of cement is due to chemical action of water with
A.	tricalcium silicate and dicalcium silicate
B.	dicalcium silicate and tricalcium aluminate
C.	tricalcium aluminate and tricalcium alumino ferrite
D.	all the above
Answer» D. all the above

discuss

244.	An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
A.	22.5 mm
B.	18.5 mm
C.	16.5 mm
D.	13.5 mm
Answer» D. 13.5 mm

discuss

245.	Approximate value of shrinkage strain in concrete, is
A.	0.003
B.	0.0003
C.	0.00003
D.	0.03
Answer» B. 0.0003

discuss

246.	For quality control of Portland cement, the test essentially done is
A.	setting time
B.	tensile strength
C.	consistency
D.	all the above
Answer» D. all the above

discuss

247.	Strength of concrete with passage of time
A.	increases
B.	decreases
C.	fluctuates
D.	remains constant
Answer» A. increases

discuss

248.	Which of the following statements is incorrect?
A.	higher vee-bee time shows lower workability
B.	higher slump shows higher workability
C.	higher compacting factor shows higher workability
D.	none of the above
Answer» D. none of the above

discuss

249.	To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between
A.	1100° and 1200°c
B.	1200° and 1300°c
C.	1300° and 1400°c
D.	1400° and 1500°c
Answer» D. 1400° and 1500°c

discuss

250.	In a pile of length , the points of suspension from ends for lifting it are located at
A.	0.207 l
B.	0.25 l
C.	0.293 l
D.	0.333 l
Answer» A. 0.207 l

discuss

320+ Concrete Technology and Design Solved MCQs

Shrinkage in concrete can be reduced by using

The shuttering of a hall measuring 4 m × 5 m, can be removed after

The approximate value of the ratio between direct tensile strength and flexural strength is

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

Workability improved by adding

Workability of concrete is inversely proportional to

Inert material of a cement concrete mix, is

If a beam fails in bond, then its bond strength can be increased most economically by

Pick up the incorrect statement from the following:

Ordinary Portland cement is manufactured from

The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

Addition of pozzolana to cement

If 50 kg of fine aggregates and 100 kg of coarse aggregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is

The minimum cover to the ties or spirals should not be less than

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

Sands of zone I are:

According to Whitney's theory, ultimate strain of concrete is assumed to be

The condition not applicable to water cement ratio law, is

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

Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than

The void ratio of

According to IS : 382-1963, a good aggregate should be

The compressive strength of 100 mm cube as compared to 150 mm cube is always

The diameter of the Vicat plunger is 10 mm and its length varies from

Gypsum is added for

Modulus of elasticity of steel as per IS: 4561978 shall be taken as

The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

The cement becomes useless if its absorbed moisture content exceeds

In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

For preparing a test-specimen, it is necessary

For a good concrete

The process of hardening the concrete by keeping its surface moist is known

For the construction of the retaining structures, the type of concrete mix to be used, is

The produce impermeable concrete

Pozzolanic properties exist in

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

Pick up the correct statement from the following:

If fineness modulus of sand is 2.5, it is graded as

Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

The increased cohesiveness of concrete, makes it

Concrete is unsuitable for compaction by a vibrator if it is

In order to obtain the best workability of concrete, the preferred shape of aggregate is

Hydration of cement is due to chemical action of water with

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

Approximate value of shrinkage strain in concrete, is

For quality control of Portland cement, the test essentially done is

Strength of concrete with passage of time

Which of the following statements is incorrect?

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

In a pile of length , the points of suspension from ends for lifting it are located at