263 + Mcqs in General Page 1 McqOptions

1.	If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than
A.	27 mm
B.	37 mm
C.	47 mm
D.	57 mm
Answer» B. 37 mm

Discussion

2.	The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is
A.	15 N/mm2
B.	20 N/mm2
C.	25 N/mm2
D.	30 N/mm2
Answer» D. 30 N/mm2

Discussion

3.	Tricalcium silicate develops strength in cement for first 7 days.
A.	Yes
B.	No
Answer» B. No

Discussion

4.	The aggregate is said to be flaky when
A.	its least dimension is three-fifth of its mean dimension
B.	its least dimension is equal to its mean dimension
C.	its length is equal to its mean dimension
D.	its length is equal to 1.8 times its mean dimension
Answer» B. its least dimension is equal to its mean dimension

Discussion

5.	An aggregate is said to be
A.	coarse
B.	fine
C.	cyclopean
Answer» D.

Discussion

6.	The value of bulk density for angular and flaky aggregates is
A.	same
B.	less
C.	more
Answer» C. more

Discussion

7.	The impact value of an aggregate is generally used as an alternative to its crushing value, to know the quality of aggregate.
A.	Yes
B.	No
Answer» B. No

Discussion

8.	The aggregate is said to be elongated when
A.	its least dimension is three-fifth of its mean dimension
B.	its least dimension is equal to its mean dimension
C.	its length is equal to its mean dimension
D.	its length is equal to 1.8 times its mean dimension
Answer» E.

Discussion

9.	The Indian standard code specifies that the crushing strength for which the mix should be designed in the laboratory should be
A.	1.25
B.	1.5
C.	2
D.	2.5
Answer» B. 1.5

Discussion

10.	The main requirement, which a ware-house should fulfil is that
A.	its walls should be water proof masonry construction
B.	its roof should be leak-proof
C.	it must have large number of windows
D.	its plinth should be very high
Answer» F.

Discussion

11.	If mineral oil is present in mixing water for concrete, it increases strength for a concentration upto 2 percent.
A.	Yes
B.	No
Answer» B. No

Discussion

12.	If the slump of the concrete mix is less than 50 mm, then while compacting it with vibratiors, the segregation will not take place.
A.	Right
B.	Wrong
Answer» B. Wrong

Discussion

13.	For heat and sound insulation purposes, we shall use
A.	vacuum concrete
B.	air-entrained concrete
C.	saw dust concrete
D.	both (b) and (c)
Answer» E.

Discussion

14.	The finer the sand, greater is the bulkage.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

15.	The most useless aggregate is, whose surface texture is
A.	smooth
B.	glossy
C.	granular
D.	porous
Answer» C. granular

Discussion

16.	A moist aggregate is one
A.	whose all the pores are filled with water and also having its surface wet
B.	whose all the pores are filled with water but having its surface dry
C.	which do not contain any moisture either in the pores or on the surface
D.	which may contain some moisture in the pores but having dry surface
Answer» B. whose all the pores are filled with water but having its surface dry

Discussion

17.	For batching 1 : 2 : 4 concrete mix by volume, the ingredients required per bag of cement are
A.	50 kg of cement : 70 kg of fine aggregate : 140 kg of coarse aggregate
B.	50 kg of cement : 70 litres of fine aggregate : 140 litres of coarse aggregate
C.	50 kg of cement : 100 kg of fine aggregate : 200 kg of coarse aggregate
D.	50 kg of cement : 100 litres of fine aggregate : 200 litres of coarse aggregate
Answer» C. 50 kg of cement : 100 kg of fine aggregate : 200 kg of coarse aggregate

Discussion

18.	A suitable admixture added at the time of preparing the concrete mix, makes the concrete.
A.	water proof
B.	acid proof
C.	highly strong
D.	all of these
Answer» E.

Discussion

19.	Reinforced cement concrete is equally strong in taking
A.	tensile and compressive stresses
B.	compressive and shear stresses
C.	tensile, compressive and shear stresses
D.	tensile and shear stresses
Answer» D. tensile and shear stresses

Discussion

20.	The strength and durability of concrete depends upon
A.	size of aggregates
B.	grading of aggregates
C.	moisture contents of aggregates
D.	all of these
Answer» E.

Discussion

21.	Concrete with higher compaction factor has less workability.
A.	True
B.	False
Answer» B. False

Discussion

22.	The value of bulk density of the aggregate depends upon
A.	size distribution of aggregate
B.	shape of aggregate
C.	specific gravity of aggregate
D.	all of these
Answer» E.

Discussion

23.	The bulk density of aggregates depends upon its
A.	shape
B.	grading
C.	compaction
D.	all of these
Answer» E.

Discussion

24.	The concrete in which preliminary tests are performed for designing the mix is called
A.	rich concrete
B.	controlled concrete
C.	lean concrete
D.	ordinary concrete
Answer» C. lean concrete

Discussion

25.	The phenomenon by virtue of which the cement does not undergo large change in volume when treated with water, is known as
A.	fineness
B.	soundness
C.	setting time
D.	none of these
Answer» C. setting time

Discussion

26.	In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt in a
A.	country kiln
B.	continuous flare kiln
C.	rotary kiln
D.	all of these
Answer» D. all of these

Discussion

27.	Trowelling should be finished on the same day of its laying operation.
A.	Yes
B.	No
Answer» B. No

Discussion

28.	The placing of concrete should start width-wide in reinforced cement concrete slabs from one end.
A.	True
B.	False
Answer» B. False

Discussion

29.	The type of lime used in lime concrete is
A.	fat lime
B.	poor lime
C.	slaked lime
D.	hydraulic lime
Answer» E.

Discussion

30.	The presence of dicalcium silicate in cement
A.	hydrates the cement slowly
B.	generates less heat of hydration
C.	has more resistance to sulphate attack
D.	all of these
Answer» E.

Discussion

31.	The continuous strain, which the concrete undergoes due to application of external loads, is called
A.	workability
B.	bleeding
C.	segregation
D.	creep
Answer» E.

Discussion

32.	The maximum particle size of coarse aggregate is
A.	45 mm
B.	55 mm
C.	65 mm
D.	75 mm
Answer» E.

Discussion

33.	The usual proportion of ingredients in reinforced cement concrete is
A.	Portland cement (1 part), clean sand (2 to 4 parts) and coarse aggregate (1 to 2 parts)
B.	Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts)
C.	Porland cement (1 part), clean sand and coarse aggregate (2 to 4 parts)
D.	any one of the above
Answer» C. Porland cement (1 part), clean sand and coarse aggregate (2 to 4 parts)

Discussion

34.	Segregation in concrete results in
A.	honey combing
B.	porous layers
C.	surface scaling
D.	all of these
Answer» E.

Discussion

35.	The admixtures are added in concrete to
A.	accelerate the rate of setting and hardening of cement
B.	make the concrete water proof, acid proof etc.
C.	reduce the bleeding and segregation of concrete mix
D.	all of the above
Answer» E.

Discussion

36.	Alumina in the cement lowers the clinkering temperature.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

37.	When the sand is fully saturated, its volume is
A.	equal to
B.	less than
C.	more than
Answer» B. less than

Discussion

38.	The presence of tricalcium silicate in cement
A.	hydrates the cement rapidly
B.	generates less heat of hydration
C.	offers high resistance to sulphate attack
D.	all of these
Answer» B. generates less heat of hydration

Discussion

39.	Vibrated concrete needs
A.	less
B.	high
Answer» B. high

Discussion

40.	The workability of concrete mix increases with the increase in moisture content.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

41.	The controlled concrete is used for
A.	one grade of concrete mix
B.	three grades of concrete mix
C.	five grades of concrete mix
D.	all the seven grades of concrete mix
Answer» E.

Discussion

42.	If sea water is used for preparing concrete mix, it
A.	reduces strength
B.	corrodes steel reinforcement
C.	causes efflorescence
D.	all of these
Answer» E.

Discussion

43.	According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that
A.	the residue does not exceed 10% when sieved through IS sieve No. 9
B.	its expansion is not more than 10 mm for unaerated cement
C.	its initial setting time is not less than 30 minutes
D.	all of the above
Answer» E.

Discussion

44.	The cement concrete, from which entrained air and excess water are removed after placing it in position, is called
A.	vacuum concrete
B.	light weight concrete
C.	prestressed concrete
D.	sawdust concrete
Answer» B. light weight concrete

Discussion

45.	The concrete can be lifted by pumps through a maximum vertical distance of
A.	10 m
B.	20 m
C.	30 m
D.	50 m
Answer» E.

Discussion

46.	The mixer, which produces a steady stream of concrete as long as it is in operation, is known as
A.	non-tilling batch mixer
B.	tilting type batch mixer
C.	continuous mixer
D.	none of these
Answer» D. none of these

Discussion

47.	The 'first-in, first-out' rule should eb applied when cement hags are to be removed from the ware-house.
A.	True
B.	False
Answer» B. False

Discussion

48.	Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

49.	The presence of lime in cement
A.	makes the cement sound
B.	provides strength to the cement
C.	lowers the clinkering temperature
D.	all of these
Answer» C. lowers the clinkering temperature

Discussion

50.	The placement of concrete should be discontinued during rainy periods
A.	Yes
B.	No
Answer» B. No

Discussion

Explore topic-wise MCQs in Concrete Technology.

If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than

The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is

Tricalcium silicate develops strength in cement for first 7 days.

The aggregate is said to be flaky when

An aggregate is said to be

The value of bulk density for angular and flaky aggregates is

The impact value of an aggregate is generally used as an alternative to its crushing value, to know the quality of aggregate.

The aggregate is said to be elongated when

The Indian standard code specifies that the crushing strength for which the mix should be designed in the laboratory should be

The main requirement, which a ware-house should fulfil is that

If mineral oil is present in mixing water for concrete, it increases strength for a concentration upto 2 percent.

If the slump of the concrete mix is less than 50 mm, then while compacting it with vibratiors, the segregation will not take place.

For heat and sound insulation purposes, we shall use

The finer the sand, greater is the bulkage.

The most useless aggregate is, whose surface texture is

A moist aggregate is one

For batching 1 : 2 : 4 concrete mix by volume, the ingredients required per bag of cement are

A suitable admixture added at the time of preparing the concrete mix, makes the concrete.

Reinforced cement concrete is equally strong in taking

The strength and durability of concrete depends upon

Concrete with higher compaction factor has less workability.

The value of bulk density of the aggregate depends upon

The bulk density of aggregates depends upon its

The concrete in which preliminary tests are performed for designing the mix is called

The phenomenon by virtue of which the cement does not undergo large change in volume when treated with water, is known as

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

Trowelling should be finished on the same day of its laying operation.

The placing of concrete should start width-wide in reinforced cement concrete slabs from one end.

The type of lime used in lime concrete is

The presence of dicalcium silicate in cement

The continuous strain, which the concrete undergoes due to application of external loads, is called

The maximum particle size of coarse aggregate is

The usual proportion of ingredients in reinforced cement concrete is

Segregation in concrete results in

The admixtures are added in concrete to

Alumina in the cement lowers the clinkering temperature.

When the sand is fully saturated, its volume is

The presence of tricalcium silicate in cement

Vibrated concrete needs

The workability of concrete mix increases with the increase in moisture content.

The controlled concrete is used for

If sea water is used for preparing concrete mix, it

According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that

The cement concrete, from which entrained air and excess water are removed after placing it in position, is called

The concrete can be lifted by pumps through a maximum vertical distance of

The mixer, which produces a steady stream of concrete as long as it is in operation, is known as

The 'first-in, first-out' rule should eb applied when cement hags are to be removed from the ware-house.

Ordinary Portland cement should not be used for construction work exposed to sulphates in the soil.

The presence of lime in cement

The placement of concrete should be discontinued during rainy periods