263 + Mcqs in General Page 4 McqOptions

151.	The gypsum is added to the cement for
A.	providing high strength to the cement
B.	controlling the initial setting time of cement
C.	lowering the clinkering temperature of cement
D.	all of the above
Answer» C. lowering the clinkering temperature of cement

Discussion

152.	Each layer of concrete placed in the mould, in preliminary test, is compacted 25 times with a 20 mm diameter rod and 60 cm in length
A.	Right
B.	Wrong
Answer» C.

Discussion

153.	In Vicat's apparatus, the diameter of Vicat plunger is
A.	5 mm
B.	10 mm
C.	15 mm
D.	20 mm
Answer» C. 15 mm

Discussion

154.	When vibrators are used for compaction, the consistency of concrete depends upon the
A.	type of mix
B.	placing conditions
C.	efficiency of vibrator
D.	all of these
Answer» E.

Discussion

155.	Vicat's apparatus is used to perform
A.	fineness test
B.	soundness test
C.	consistency test
D.	compressive strength test
Answer» D. compressive strength test

Discussion

156.	The main object of proportioning concrete is to obtain
A.	required strength and workability
B.	desired durability
C.	water tightness
D.	all of these
Answer» E.

Discussion

157.	The process of proper and accurate measurement of all concrete materials for uniformity of proportions and aggregate grading is called
A.	proportioning
B.	grading
C.	mixing
D.	batching
Answer» E.

Discussion

158.	The apparent specific gravity of an aggregate is defined as
A.	the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
B.	the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
C.	the weight of aggregate required to fill a container of unit volume
D.	the difference in weight of the aggregate in saturated surface dry condition and in moist condition
Answer» B. the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles

Discussion

159.	Bulk specific gravity of an aggregate is defined as
A.	the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
B.	the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
C.	the weight of aggregate required to fill a container of unit volume
D.	the difference in weight of the aggregate in saturated surface dry condition and in moist condition
Answer» C. the weight of aggregate required to fill a container of unit volume

Discussion

160.	The term 'ware-hourse pack' means
A.	the total capacity of ware-house
B.	packing of ware-house
C.	pressure compaction of bags on lower layers
D.	pressure exertion of bags on upper layers
Answer» D. pressure exertion of bags on upper layers

Discussion

161.	Weight batching is done by
A.	spring dial scale
B.	platform weighing machine
C.	portable weigh batchers
D.	all of these
Answer» E.

Discussion

162.	The cement concrete prepared by mixing aluminium in it, is called
A.	air-entrained concrete
B.	cellular concrete
C.	aerated concrete
D.	any one of the above
Answer» E.

Discussion

163.	The cement concrete in which high compressive stresses are artificially induced before its actual use, is called
A.	plain cement concrete
B.	reinforced cement concrete
C.	prestressed cement concrete
D.	lime concrete
Answer» D. lime concrete

Discussion

164.	For a structure subjected to the action of sea water, the cement used is
A.	rapid hardening cement
B.	low heat cement
C.	high alumina cement
D.	sulphate resisting cement
Answer» D. sulphate resisting cement

Discussion

165.	The top diameter, bottom diameter and height of the mould used for slump test are respectively
A.	100 mm, 200 mm, 300 mm
B.	200 mm, 100 mm, 300 mm
C.	200 mm, 300 mm, 100 mm
D.	100 mm, 300 mm, 200 mm
Answer» B. 200 mm, 100 mm, 300 mm

Discussion

166.	Plain cement concrete is strong in taking
A.	tensile stress
B.	compressive stress
C.	shear stress
D.	all of these
Answer» C. shear stress

Discussion

167.	As per IS : 459-1978, the concrete mixes are designated into
A.	4 grades
B.	5 grades
C.	6 grades
D.	7 grades
Answer» E.

Discussion

168.	The factor which effect the quality of compaction, is
A.	density of concrete
B.	strength of concrete
C.	durability of concrete
D.	all of these
Answer» E.

Discussion

169.	The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as
A.	cyclopean aggregate
B.	coarse aggregate
C.	fine aggregate
D.	all-in-aggregate
Answer» C. fine aggregate

Discussion

170.	The fineness modulus of an aggregate is roughly proportional to
A.	specific gravity of the aggregate
B.	shape of the aggregate
C.	average size of particles in the aggregate
D.	grading of the aggregate
Answer» D. grading of the aggregate

Discussion

171.	For concreting of tunnel lining, the concrete is transported by
A.	pumps
B.	pans
C.	wheel barrows
D.	containers
Answer» B. pans

Discussion

172.	The length of Vicat plunger in Vicat's apparatus varies from
A.	20 to 30 mm
B.	30 to 40 mm
C.	40 to 50 mm
D.	50 to 60 mm
Answer» D. 50 to 60 mm

Discussion

173.	For the improvement of workability of concrete, the shape of aggregate recommended is
A.	irregular
B.	angular
C.	round
D.	flaky
Answer» D. flaky

Discussion

174.	Grading of aggregates should be continuous for
A.	lean
B.	rich
Answer» B. rich

Discussion

175.	Water cement ratio may be defined as the ratio of
A.	volume of water to that of cement in a concrete mix
B.	weight of water to that of cement in a concrete mix
C.	volume of water to that of concrete in a concrete mix
D.	weight of water to that of concrete in a concrete mix
Answer» F.

Discussion

176.	The internal friction between the ingredients of concrete is minimised by
A.	adopting coarse aggregates
B.	using more water
C.	reducing the surface area
D.	all of these
Answer» E.

Discussion

177.	The lime concrete has
A.	less
B.	more
C.	same
Answer» B. more

Discussion

178.	The tetra calcium alumino ferrite in cement has
A.	good
B.	poor
Answer» C.

Discussion

179.	The presence of
A.	sodium carbonate and bicarbonate
B.	calcium chloride
C.	sodium chloride
D.	sodium sulphate
Answer» B. calcium chloride

Discussion

180.	For reinforced concrete, the aggregate used is
A.	sand
B.	gravel
C.	crushed rock
D.	all of these
Answer» E.

Discussion

181.	For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is
A.	internal vibrator
B.	screed vibrator
C.	form vibrator
D.	all of these
Answer» C. form vibrator

Discussion

182.	For compacting large sections of mass concrete in structures, the type of vibrator used is
A.	internal vibrator
B.	screed vibrator
C.	both (a) and (b)
D.	either (a) or (b)
Answer» B. screed vibrator

Discussion

183.	The resistance of an aggregate to compressive forces is known as
A.	crushing value
B.	impact value
C.	abrasion value
D.	none of these
Answer» B. impact value

Discussion

184.	The steel mould used for slump test is in the form of a
A.	cube
B.	cylinder
C.	frustrum of a cone
D.	none of these
Answer» D. none of these

Discussion

185.	The surface moisture of aggregates increases the water-cement ratio in the mix and thus
A.	increases
B.	decreases
Answer» C.

Discussion

186.	The aggregates of
A.	irregular
B.	angular
C.	rounded
D.	flaky
Answer» C. rounded

Discussion

187.	The size of an aggregate is determined by length gauge.
A.	Yes
B.	No
Answer» C.

Discussion

188.	Harshness in concrete is due to the excess of
A.	water
B.	finer particles
C.	middle sized particle
D.	coarser particles
Answer» D. coarser particles

Discussion

189.	The concrete
A.	should
B.	should not
Answer» B. should not

Discussion

190.	The strength of concrete using air entraining cement gets reduced by
A.	5 to 10%
B.	10 to 15%
C.	15 to 20%
D.	20 to 25%
Answer» C. 15 to 20%

Discussion

191.	At freezing point, the concrete sets easily.
A.	Right
B.	Wrong
Answer» C.

Discussion

192.	In order to prepare a test specimen, it is necessary to
A.	mix the cement and fine aggregate (sand) by dry hand
B.	mix the coarse aggregate
C.	mix water to the cment, fine aggregate and coarse aggregates
D.	all of the above
Answer» E.

Discussion

193.	The importance of batching is to obtain
A.	strength
B.	workability
C.	durability
D.	all of these
Answer» E.

Discussion

194.	In designing a ware-house, it is assumed that
A.	each bag contains 50 kg of cement
B.	floor area occupied by one bag of cement is 0.3 m2
C.	height of each cement bag containing 35 litres of cement is 0.18 m
D.	all of the above
Answer» E.

Discussion

195.	Too much finencess of cement
A.	results cracks in concrete
B.	generates greater heat
C.	develops early strength
D.	both (a) and (b)
Answer» E.

Discussion

196.	In making precast structural units for partition and wall lining purposes, the concrete should be
A.	sawdust concrete
B.	air-entrained concrete
C.	light-weight concrete
D.	vacuum concrete
Answer» D. vacuum concrete

Discussion

197.	Los Angeles machine is used to perform the abrasion resistance test of an aggregate.
A.	Right
B.	Wrong
Answer» B. Wrong

Discussion

198.	The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates.
A.	True
B.	False
Answer» B. False

Discussion

199.	If the fineness modulus of sand is 3, then the sand is graded as
A.	very fine sand
B.	fine sand
C.	medium sand
D.	coarse sand
Answer» E.

Discussion

200.	The maximum particle size of fine aggregate is
A.	2.5 mm
B.	4.75 mm
C.	5.85 mm
D.	6.5 mm
Answer» C. 5.85 mm

Discussion

Explore topic-wise MCQs in Concrete Technology.

The gypsum is added to the cement for

Each layer of concrete placed in the mould, in preliminary test, is compacted 25 times with a 20 mm diameter rod and 60 cm in length

In Vicat's apparatus, the diameter of Vicat plunger is

When vibrators are used for compaction, the consistency of concrete depends upon the

Vicat's apparatus is used to perform

The main object of proportioning concrete is to obtain

The process of proper and accurate measurement of all concrete materials for uniformity of proportions and aggregate grading is called

The apparent specific gravity of an aggregate is defined as

Bulk specific gravity of an aggregate is defined as

The term 'ware-hourse pack' means

Weight batching is done by

The cement concrete prepared by mixing aluminium in it, is called

The cement concrete in which high compressive stresses are artificially induced before its actual use, is called

For a structure subjected to the action of sea water, the cement used is

The top diameter, bottom diameter and height of the mould used for slump test are respectively

Plain cement concrete is strong in taking

As per IS : 459-1978, the concrete mixes are designated into

The factor which effect the quality of compaction, is

The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as

The fineness modulus of an aggregate is roughly proportional to

For concreting of tunnel lining, the concrete is transported by

The length of Vicat plunger in Vicat's apparatus varies from

For the improvement of workability of concrete, the shape of aggregate recommended is

Grading of aggregates should be continuous for

Water cement ratio may be defined as the ratio of

The internal friction between the ingredients of concrete is minimised by

The lime concrete has

The tetra calcium alumino ferrite in cement has

The presence of

For reinforced concrete, the aggregate used is

For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is

For compacting large sections of mass concrete in structures, the type of vibrator used is

The resistance of an aggregate to compressive forces is known as

The steel mould used for slump test is in the form of a

The surface moisture of aggregates increases the water-cement ratio in the mix and thus

The aggregates of

The size of an aggregate is determined by length gauge.

Harshness in concrete is due to the excess of

The concrete

The strength of concrete using air entraining cement gets reduced by

At freezing point, the concrete sets easily.

In order to prepare a test specimen, it is necessary to

The importance of batching is to obtain

In designing a ware-house, it is assumed that

Too much finencess of cement

In making precast structural units for partition and wall lining purposes, the concrete should be

Los Angeles machine is used to perform the abrasion resistance test of an aggregate.

The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates.

If the fineness modulus of sand is 3, then the sand is graded as

The maximum particle size of fine aggregate is