263 + Mcqs in General Page 5 McqOptions

201.	For highly loaded columns, the concrete mix used is of proportion
A.	1 ; 1 : 2
B.	1 ; 1.5 : 3
C.	1 ; 2 : 4
D.	1 ; 3 : 6
Answer» B. 1 ; 1.5 : 3

Discussion

202.	The concrete mix is said to be workable if it has
A.	compatibility
B.	movability
C.	stability
D.	all of these
Answer» E.

Discussion

203.	The usual proportion of ingredients in plain cement concrete is
A.	Portland cement (1 part), clean sand (1
B.	Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1
C.	Porland cement (1 part), clean sand and coarse aggregate (1
D.	any one of the above
Answer» B. Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1

Discussion

204.	A compaction factor of 0.88 indictes that the workability of concrete mix is
A.	very low
B.	low
C.	medium
D.	high
Answer» D. high

Discussion

205.	Pezzolana is essentially a silicious material containing clay upto
A.	20%
B.	40%
C.	60%
D.	80%
Answer» E.

Discussion

206.	The material having particle size varying from 0.002 to 0.06 mm is termed as
A.	silt
B.	clay
C.	sand
D.	none of these
Answer» B. clay

Discussion

207.	The inert mineral material used for the manufacture of mortars and concretes is
A.	cement
B.	water
C.	aggregate
D.	admixture
Answer» D. admixture

Discussion

208.	When the batching of material is done by weight
A.	the bucket in which the material is to be weighed should be cleaned thoroughly
B.	the weighing machine should be levelled before placing the material
C.	the chart should be prepared indicating the weight of each material used for different strengths of concrete
D.	all of the above
Answer» E.

Discussion

209.	Calcareous material used in the manufacture of cement consists of
A.	lime stone
B.	chalk
C.	shells
D.	all of these
Answer» E.

Discussion

210.	The characteristic, which makes the concrete a versatile and widely used material of modern consturction, is the possibility of
A.	controlling the properties of concrete by using appropriate ingredients
B.	moulding the concrete in any desired shape
C.	complete mechanisation of concrete preparation and its placing process
D.	all of the above
Answer» E.

Discussion

211.	The chemical ingredient of cement which provides quick setting property to the cement is
A.	lime
B.	silica
C.	alumina
D.	iron oxide
Answer» D. iron oxide

Discussion

212.	The sound absorption coefficient of light weight concrete is nearly
A.	twice
B.	three times
C.	four times
D.	six times
Answer» B. three times

Discussion

213.	The bulk density of an aggregate is the weight required to fill a container of unit volume.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

214.	The water used for ordinary concrete is equal to 5% by weight of aggregate plus
A.	10%
B.	20%
C.	30%
D.	40%
Answer» D. 40%

Discussion

215.	The light-weight concrete is prepared by
A.	mixing Portland cement with sawdust in specified proportion in the concrete
B.	using coke-breeze, cinder or slag as aggregate in the concrete
C.	mixing aluminium in the concrete
D.	none of tha above
Answer» C. mixing aluminium in the concrete

Discussion

216.	For the manufacture of concrete of low density, the aggregate used is
A.	furnace clinker
B.	coke breeze
C.	saw dust
D.	all of these
Answer» E.

Discussion

217.	To perform the initial setting time test, the water is added to the cement at the rate of
A.	0.72 P
B.	0.78 P
C.	0.85 P
D.	0.95 P
Answer» D. 0.95 P

Discussion

218.	The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds
A.	0.5 N / mm2
B.	1 N / mm2
C.	1.5 N / mm2
D.	2 N / mm2
Answer» D. 2 N / mm2

Discussion

219.	The resistance of an aggregate to sudden compressive forces is called impact value.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

220.	For performing the compressive strength test of cement, the size of cube mould should be 7.06 cm side.
A.	Right
B.	Wrong
Answer» B. Wrong

Discussion

221.	More water should not be added in the concrete mix, as to increase
A.	strength
B.	durability
C.	water-cement ratio
D.	all of these
Answer» D. all of these

Discussion

222.	If the effective plan area of a warehouse is 54 m2, and the maximum height of pile permitted is 2.7 m, then the number of cement bags to be stord is
A.	2000
B.	2200
C.	2500
D.	2700
Answer» E.

Discussion

223.	The process of mixing, transporting, placing and compacting the cement concrete should not take more than
A.	30 minutes
B.	60 minutes
C.	90 minutes
D.	120 minutes
Answer» B. 60 minutes

Discussion

224.	The number of bags of cement required per cubic metre of 1 ; 2 ; 4 concrete will be approximately
A.	2 to 3
B.	3 to 4
C.	4 to 5
D.	5 to 6
Answer» E.

Discussion

225.	For high degree of workability, the slump value should vary between
A.	0 to 25 mm
B.	25 to 50 mm
C.	50 to 80 mm
D.	80 to 100 mm
Answer» E.

Discussion

226.	The prevent the cement bags from any possible contact with moisture, the main point that should be kept in mind is that the
A.	space between the exterior walls and piles should be 30 cm
B.	cement bags should be placed closer together in the piles
C.	width and height of the pile should not exceed 3 m and 2.70 m respectively
D.	all of the above
Answer» E.

Discussion

227.	To prevent segregation, the concrete should not be thrown from a height of more than
A.	1/2 m
B.	1 m
C.	1.5 m
D.	2 m
Answer» C. 1.5 m

Discussion

228.	The knowledge of a standard consistency of a cement paste is essential to perform
A.	setting time test
B.	soundness test
C.	compressive strength test
D.	all of these
Answer» E.

Discussion

229.	The change of state of cement paste from fluid to solid is called hardening.
A.	Right
B.	Wrong
Answer» C.

Discussion

230.	The aggregates of rounded shape require minimum cement paste to make good concrete.
A.	True
B.	False
Answer» B. False

Discussion

231.	The magnesium oxide and sulphur dioxide when added in excess quantity makes the cement unsound.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

232.	Low heat cement contains more lime than ordinary Portland cement.
A.	True
B.	False
Answer» C.

Discussion

233.	The percentage of water for making a cement paste of normal consistency varies from
A.	15 to 25%
B.	25 to 35%
C.	35 to 50%
D.	50 to 60%
Answer» C. 35 to 50%

Discussion

234.	The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be
A.	63 : 22 : 6 : 3
B.	62 : 22 : 3 : 6
C.	22 : 63 : 6 : 3
D.	22 : 63 : 3 : 6
Answer» B. 62 : 22 : 3 : 6

Discussion

235.	In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about
A.	20%
B.	30%
C.	40%
D.	50%
Answer» C. 40%

Discussion

236.	Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly?
A.	Lime
B.	silica
C.	alumina
D.	iron oxide
Answer» C. alumina

Discussion

237.	Proper curing of cement concrete, is good for its
A.	volume stability
B.	strength
C.	wear resistance
D.	all of these
Answer» E.

Discussion

238.	After the curing of 28 days, the concrete gains strength upto
A.	40%
B.	67%
C.	100%
D.	122%
Answer» D. 122%

Discussion

239.	The resistance of an aggregate to the effect of hydration of cement and weather is called
A.	crushing value
B.	impact value
C.	abrasion value
D.	soundness
Answer» E.

Discussion

240.	The object of curing is to
A.	prevent the loss of water by evaporation
B.	reduce the shrinkage of concrete
C.	preserve the properties of concrete
D.	all of these
Answer» E.

Discussion

241.	Hydration of cement evolves heat.
A.	True
B.	False
Answer» B. False

Discussion

242.	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» D. 14 kg

Discussion

243.	The cement concrete having water-cement ratio less than 0.45 by weight, causes honey-comb structure.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

244.	The rate of hydration is
A.	directly
B.	inversely
Answer» B. inversely

Discussion

245.	Hydration of cement is due to the chemical action of water with
A.	dicalcium silicate
B.	tricalcium silicate
C.	tricalcium aluminate
D.	all of these
Answer» E.

Discussion

246.	An aggregate having all the pores filled with water but having dry surface is called
A.	very dry aggregate
B.	dry aggregate
C.	saturated surface dry aggregate
D.	moist aggregate
Answer» D. moist aggregate

Discussion

247.	To perform the soundness test, the water is added to the cement at the rate of 0.72 P by weight of cement, where P is the percentage of water required for normal consistency paste.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

248.	An aggregate which may contain some moisture in the pores but having dry surface is known as
A.	very dry aggregate
B.	dry aggregate
C.	saturated surface dry aggregate
D.	moist aggregate
Answer» C. saturated surface dry aggregate

Discussion

249.	In voids method of determining the quantity of cement paste, it is assumed that the
A.	voids in the coarse aggregate are filled by the fine aggregates
B.	volume of fine aggregates required for 1 m3 of coarse aggregate is equal to total voids in coarse aggregate plus 10% aggregate extra to allow for additional voids created by wedging action
C.	volume of cement paste required for 1 m3 of coarse aggregate is equal to total volum of voids in the fine aggregate plus 15% aggregate extra to allow for additional voids created be wedging action
D.	all of the above
Answer» E.

Discussion

250.	For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed.
A.	10 mm
B.	15 mm
C.	20 mm
D.	40 mm
Answer» C. 20 mm

Discussion

Explore topic-wise MCQs in Concrete Technology.

For highly loaded columns, the concrete mix used is of proportion

The concrete mix is said to be workable if it has

The usual proportion of ingredients in plain cement concrete is

A compaction factor of 0.88 indictes that the workability of concrete mix is

Pezzolana is essentially a silicious material containing clay upto

The material having particle size varying from 0.002 to 0.06 mm is termed as

The inert mineral material used for the manufacture of mortars and concretes is

When the batching of material is done by weight

Calcareous material used in the manufacture of cement consists of

The characteristic, which makes the concrete a versatile and widely used material of modern consturction, is the possibility of

The chemical ingredient of cement which provides quick setting property to the cement is

The sound absorption coefficient of light weight concrete is nearly

The bulk density of an aggregate is the weight required to fill a container of unit volume.

The water used for ordinary concrete is equal to 5% by weight of aggregate plus

The light-weight concrete is prepared by

For the manufacture of concrete of low density, the aggregate used is

To perform the initial setting time test, the water is added to the cement at the rate of

The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds

The resistance of an aggregate to sudden compressive forces is called impact value.

For performing the compressive strength test of cement, the size of cube mould should be 7.06 cm side.

More water should not be added in the concrete mix, as to increase

If the effective plan area of a warehouse is 54 m2, and the maximum height of pile permitted is 2.7 m, then the number of cement bags to be stord is

The process of mixing, transporting, placing and compacting the cement concrete should not take more than

The number of bags of cement required per cubic metre of 1 ; 2 ; 4 concrete will be approximately

For high degree of workability, the slump value should vary between

The prevent the cement bags from any possible contact with moisture, the main point that should be kept in mind is that the

To prevent segregation, the concrete should not be thrown from a height of more than

The knowledge of a standard consistency of a cement paste is essential to perform

The change of state of cement paste from fluid to solid is called hardening.

The aggregates of rounded shape require minimum cement paste to make good concrete.

The magnesium oxide and sulphur dioxide when added in excess quantity makes the cement unsound.

Low heat cement contains more lime than ordinary Portland cement.

The percentage of water for making a cement paste of normal consistency varies from

The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be

In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about

Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly?

Proper curing of cement concrete, is good for its

After the curing of 28 days, the concrete gains strength upto

The resistance of an aggregate to the effect of hydration of cement and weather is called

The object of curing is to

Hydration of cement evolves heat.

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 cement concrete having water-cement ratio less than 0.45 by weight, causes honey-comb structure.

The rate of hydration is

Hydration of cement is due to the chemical action of water with

An aggregate having all the pores filled with water but having dry surface is called

To perform the soundness test, the water is added to the cement at the rate of 0.72 P by weight of cement, where P is the percentage of water required for normal consistency paste.

An aggregate which may contain some moisture in the pores but having dry surface is known as

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

For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed.