263 + Mcqs in General Page 3 McqOptions

101.	The construction joints are generally provided in concrete
A.	roads
B.	retaining walls
C.	lining of tunnels
D.	all of these
Answer» E.

Discussion

102.	The tricalcium aluminate in cement has the property of
A.	reacting fast with water
B.	causing initial setting of cement
C.	generating large amount of heat hydration
D.	all of these
Answer» E.

Discussion

103.	The finished concrete is measured in litres.
A.	Right
B.	Wrong
Answer» C.

Discussion

104.	Excess quantity of water
A.	makes the concrete mix harsh
B.	makes the concrete mix unworkable
C.	causes segregation in concrete
D.	causes bleeding in concrete
Answer» E.

Discussion

105.	The coarser the aggregate, the
A.	higher
B.	lower
Answer» B. lower

Discussion

106.	In lime concrete, lime is used as
A.	coarse aggregate
B.	fine aggregate
C.	binding material
D.	admixture
Answer» D. admixture

Discussion

107.	The minimum particle size of fine aggregate is
A.	0.0075 mm
B.	0.075 mm
C.	0.75 mm
D.	0.95 mm
Answer» C. 0.75 mm

Discussion

108.	The factor which effect the design of concrete mix is
A.	fineness modulus
B.	water-cement ratio
C.	slump
D.	all of these
Answer» E.

Discussion

109.	Blast furnace slag cement is used for
A.	dams
B.	bridge abutments
C.	retaining walls
D.	all of these
Answer» E.

Discussion

110.	In performing preliminary test
A.	the moulds requred for test specimens should be rigid
B.	the mxi should be stored in air=tight containers
C.	the aggregates should be dry
D.	all of the above
Answer» E.

Discussion

111.	If the slump of concrete mix is 70 mm, its workability is considered to be
A.	very low
B.	low
C.	medium
D.	high
Answer» D. high

Discussion

112.	When the concrete mix is too wet, it causes
A.	segregation
B.	low density
C.	excess laitance at the top
D.	all of these
Answer» E.

Discussion

113.	Fine sand bulks
A.	less
B.	more
Answer» C.

Discussion

114.	Le-chatelier apparatus is used to perform
A.	fineness test
B.	soundness test
C.	consistency test
D.	compressive strength test
Answer» C. consistency test

Discussion

115.	Smaller size aggregates require less quantity of water for lubrication.
A.	Yes
B.	No
Answer» C.

Discussion

116.	The prestressed cement concrete can take up high tensile and compressive stresses without development of cracks.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

117.	The presence of calcium chloride in water
A.	accelerates setting of cement
B.	accelerates hardening of cement
C.	causes little effect on quality of concrete
D.	all of these
Answer» B. accelerates hardening of cement

Discussion

118.	In flooring of building, prestressed cement concrete is commonly used.
A.	Right
B.	Wrong
Answer» C.

Discussion

119.	For measuring aggregates by volume, wooden batch boxes known as farmas are used.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

120.	The degree of grinding of cement is called
A.	fineness
B.	soundness
C.	impact value
D.	bulking
Answer» B. soundness

Discussion

121.	Blast furnace slag cement concrete requires
A.	less
B.	more
Answer» C.

Discussion

122.	The material used as an ingredient of concrete is usually
A.	cement
B.	aggregate
C.	water
D.	all of these
Answer» E.

Discussion

123.	The ordinary concrete is no used for
A.	M 10
B.	M 20
C.	M 25
D.	M 40
Answer» E.

Discussion

124.	During field test, the cement is said to be pure and of good quality when
A.	the colour of cement is uniformly greenish grey
B.	a handful of cement, thrown into a bucket of water, floats
C.	hand is thrusted into a bag of cement, it feels cool
D.	all of the above
Answer» E.

Discussion

125.	Water cannot be used as a lubricant in concrete mix.
A.	True
B.	False
Answer» C.

Discussion

126.	The preliminary test is always conducted in the field.
A.	Agree
B.	Disagree
Answer» C.

Discussion

127.	The workability of concrete by slump test is expressed as
A.	minutes
B.	mm / h
C.	mm2 / h
D.	mm
Answer» E.

Discussion

128.	Water-cement ratio is, usually, expressed in
A.	litres of water required per bag of cement
B.	litres of water required per kg of cement
C.	both (a) and (b)
D.	none of these
Answer» B. litres of water required per kg of cement

Discussion

129.	With the moisture content of 5 to 10% by weight, the bulking of sand is increased by
A.	20%
B.	30%
C.	40%
D.	50%
Answer» E.

Discussion

130.	In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt at a temperature between
A.	900? to 1000?C
B.	1000?C to 1200?C
C.	1200?C to 1500?C
D.	1500?C to 1600?C
Answer» E.

Discussion

131.	The mass concrete in piers and abutments, the grade of concrete mix used, is
A.	1 ; 1 : 2
B.	1 ; 1.5 : 3
C.	1 ; 2 : 4
D.	1 ; 3 : 6
Answer» E.

Discussion

132.	Low heat cement is used in
A.	thin
B.	thick
Answer» C.

Discussion

133.	The concrete in which no preliminary tests are performed for designing the mix is called
A.	rich concrete
B.	controlled concrete
C.	lean concrete
D.	ordinary concrete
Answer» E.

Discussion

134.	Insufficient quantity of water
A.	makes the concrete mix harsh
B.	makes the concrete mix unworkable
C.	causes segregation in concrete
D.	causes bleeding in concrete
Answer» C. causes segregation in concrete

Discussion

135.	The deleterious materials present in the aggregate
A.	prevent normal hydration of cement
B.	reduce the strength and durability of concrete
C.	modify the setting action and cause efflorescence
D.	all of the above
Answer» E.

Discussion

136.	The Vee-Bee test is suitable for concrete mixes of low and very low workabilities.
A.	True
B.	False
Answer» B. False

Discussion

137.	Which of the following grade is not recommended by IS 456-1978?
A.	M 10
B.	M 20
C.	M 40
D.	M 55
Answer» E.

Discussion

138.	The breaking up of cohesion in a mass of concrete is called
A.	workability
B.	bleeding
C.	segregation
D.	creep
Answer» D. creep

Discussion

139.	The use of air-entraining agents in concrete
A.	increases workability of concrete
B.	decreases bleeding
C.	decreases strength
D.	all of these
Answer» E.

Discussion

140.	The removal of excess air after placing concrete helps in increasing the strength of concrete by
A.	15 to 20%
B.	20 to 30%
C.	30 to 50%
D.	50 to 70%
Answer» B. 20 to 30%

Discussion

141.	The practical utility of concrete technology for civil engineers is to
A.	enable them to know how to stock properly the materials required for concrete
B.	enable them to perform different tests concerning concrete
C.	make them conversant with fundamental principles of concrete
D.	all of the above
Answer» E.

Discussion

142.	The workability of concrete is defined as the
A.	ease with which it can be mixed, transported and placed in position in a homogeneous state
B.	breaking up of cohesion in a mass of concrete
C.	separation of water or water-cement mixture from the freshly mixed concrete
D.	none of the above
Answer» B. breaking up of cohesion in a mass of concrete

Discussion

143.	For continuous transportation of concrete, the method used is
A.	transport of concrete by pans
B.	transport of concrete by wheel barrows
C.	transport of concrete by belt concrete conveyors
D.	transport of concrete by pumps
Answer» D. transport of concrete by pumps

Discussion

144.	The function of aggregates in concrete is to serve as
A.	binding material
B.	filler
C.	catalyst
D.	all of these
Answer» C. catalyst

Discussion

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

Discussion

146.	Ferro-concrete is another name given to
A.	plain cement concrete
B.	reinforced cement concrete
C.	prestressed cement concrete
D.	none of these
Answer» C. prestressed cement concrete

Discussion

147.	The setting time of cement is the governing factor for
A.	mixing of concrete
B.	placing of concrete
C.	compaction of concrete
D.	all of these
Answer» E.

Discussion

148.	Initial setting time of ordinary Portland cement is
A.	15 min
B.	30 min
C.	60 min
D.	10 h
Answer» C. 60 min

Discussion

149.	After the final grinding, the cement is sieved through IS sieve number
A.	9
B.	12
C.	24
D.	48
Answer» B. 12

Discussion

150.	The fineness of cement is measured in terms of
A.	percentage weight retained on IS sieve number 9
B.	surface area in cm2 per gram of the cement
C.	either (a) or (b)
D.	none of these
Answer» D. none of these

Discussion

Explore topic-wise MCQs in Concrete Technology.

The construction joints are generally provided in concrete

The tricalcium aluminate in cement has the property of

The finished concrete is measured in litres.

Excess quantity of water

The coarser the aggregate, the

In lime concrete, lime is used as

The minimum particle size of fine aggregate is

The factor which effect the design of concrete mix is

Blast furnace slag cement is used for

In performing preliminary test

If the slump of concrete mix is 70 mm, its workability is considered to be

When the concrete mix is too wet, it causes

Fine sand bulks

Le-chatelier apparatus is used to perform

Smaller size aggregates require less quantity of water for lubrication.

The prestressed cement concrete can take up high tensile and compressive stresses without development of cracks.

The presence of calcium chloride in water

In flooring of building, prestressed cement concrete is commonly used.

For measuring aggregates by volume, wooden batch boxes known as farmas are used.

The degree of grinding of cement is called

Blast furnace slag cement concrete requires

The material used as an ingredient of concrete is usually

The ordinary concrete is no used for

During field test, the cement is said to be pure and of good quality when

Water cannot be used as a lubricant in concrete mix.

The preliminary test is always conducted in the field.

The workability of concrete by slump test is expressed as

Water-cement ratio is, usually, expressed in

With the moisture content of 5 to 10% by weight, the bulking of sand is increased by

In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt at a temperature between

The mass concrete in piers and abutments, the grade of concrete mix used, is

Low heat cement is used in

The concrete in which no preliminary tests are performed for designing the mix is called

Insufficient quantity of water

The deleterious materials present in the aggregate

The Vee-Bee test is suitable for concrete mixes of low and very low workabilities.

Which of the following grade is not recommended by IS 456-1978?

The breaking up of cohesion in a mass of concrete is called

The use of air-entraining agents in concrete

The removal of excess air after placing concrete helps in increasing the strength of concrete by

The practical utility of concrete technology for civil engineers is to

The workability of concrete is defined as the

For continuous transportation of concrete, the method used is

The function of aggregates in concrete is to serve as

The aggregate which pass through 4.75 mm IS sieve and entirely retain on 75 micron IS sieve is called

Ferro-concrete is another name given to

The setting time of cement is the governing factor for

Initial setting time of ordinary Portland cement is

After the final grinding, the cement is sieved through IS sieve number

The fineness of cement is measured in terms of