Membrane curing is done by:

applying steam on the surface of the concrete

applying paraffin or resin-based liquids on the surface of the concrete

applying steam on the surface of the concrete

ponding of water on the surface of the concrete

applying spray of water on the surface of the concrete

Fly ash addition to concrete helps in

Improves pumpability and reduces curing time

Improving workability, pumpability and accelerates early strength gain

Reducing set time of concrete and improves finishibility

Reducing the water demand, reducing the heat of hydration and delays the setting time of concrete

Improves pumpability and reduces curing time

Increasing the bleeding by reducing the heat of hydration

Choose the correct statement.a) The strength of fully compacted concrete is inversely proportional to the water cement ratio.b) The strength of fully compacted concrete is directly proportional to the water cement ratio.

Both the statements (a) and (b) are true

Both the statements (a) and (b) are false

A concrete mix has entrapped air about 1% results in:

Requires less quantity of water

Poor quality of concrete in terms of workability

Average quality of concrete terms of workability

Improved quality of concrete terms of workability

Requires less quantity of water

In mix design the proportion 1 : 2 : 4 means:

4 part of cement is mixed with 2 part of sand and 1 part of coarse aggregate

2 part of cement is mixed with 1 part of sand and 4 part of coarse aggregate

1 part of cement is mixed with 4 part of sand and 2 part of coarse aggregate

1 part of cement is mixed with 2 part of sand and 4 part of coarse aggregate

4 part of cement is mixed with 2 part of sand and 1 part of coarse aggregate

Match List-I (Admixtures) with List-II (Chemicals) and select correct answer using the codes given below the lists:List IList II(A) Water reducing admixture1. Sulphonated melanin(B) Air entraining agent2. Calcium chloride(C) Super plasticizer3. Lignosulphonate(D) Accelerator4. Neutralized vinsol resin

A – 3, B – 4, C – 2, D – 1

A – 2, B – 4, C – 1, D – 3

A – 1, B – 3, C – 4, D – 2

A – 3, B – 4, C – 1, D – 2

A – 3, B – 4, C – 2, D – 1

Addition of sugar in concrete results in _______

Decrease in setting time by about 1 hr

Increase in setting time by about 1 hr

Increase in setting time by about 4 hr

Decrease in setting time by about 1 hr

Decrease in setting time by about 4 hr

One of the following measure could not reduce or eliminate plastic shrinkage cracks:

Concrete should be poured in layers

Reduce the time between placing and finishing

In 4th amendment of IS 456-2000, M60 grade has been shifted

to high strength concrete from standard concrete

to standard concrete from high strength concrete

to high strength concrete from standard concrete

to standard concrete from an ordinary concrete

to ordinary concrete from a standard concrete

If the age of loading increases, the creep coefficient for concrete will:

increase if age of loading is greater than 28 days, otherwise it will decrease

Brass cannot be used as reinforcement in concrete because

Its density is greater than concrete

It density is smaller than iron

Its coefficient of thermal expansion is higher than concrete

116 + Mcqs in Proportioning Concrete in Construction Materials Page 1 McqOptions

1.	The strength of well compacted concrete with good workability is depended only on the _________
A.	Water content
B.	Cement content
C.	Water-cement ratio
D.	Water-soaked ratio
Answer» D. Water-soaked ratio

Discussion

2.	________ method is based on the principle that the densest concrete is achieved by proportioning its aggregate in such a manner that the heaviest weight of concrete for same volume is obtained.
A.	Minimum void method
B.	Arbitrary method
C.	Water-cement ratio method
D.	Maximum void method
Answer» E.

Discussion

3.	For lean concrete bases and simple foundation for masonry walls ________ grades of concrete may be used.
A.	M40 and M35
B.	M5 and M7.5
C.	M10 and M20
D.	M1.5 and M2.5
Answer» C. M10 and M20

Discussion

4.	The theory of formation of __________ is based on the phenomenon of the formation of voids.
A.	Concrete
B.	Cement
C.	Water-cement
D.	Slurry
Answer» B. Cement

Discussion

5.	Aerated concrete is produced by the addition of:
A.	Zinc sulphate
B.	Magnesium sulphate
C.	Powdered aluminium
D.	Sodium nitrate
Answer» D. Sodium nitrate

Discussion

6.	Non-uniform compaction may cause the concrete:
A.	Porous
B.	Non-homogeneous
C.	Reduced strength
D.	All of the above
Answer» E.

Discussion

7.	Polymer concrete is used specifically when desirable concrete is to be ______.
A.	Light weight
B.	Heavy weight
C.	Impermeable
D.	Used under high temperature
Answer» B. Heavy weight

Discussion

8.	A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm2 intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly
A.	148 N/mm2
B.	126 N/mm2
C.	104 N/mm2
D.	82 N/mm2
Answer» D. 82 N/mm2

Discussion

9.	If the compressive strength difference of the three test specimens is more than the following, then the test should be done again.
A.	1.5 N/mm2
B.	1 N/mm2
C.	2 N/mm2
D.	0.5 N/mm2
Answer» B. 1 N/mm2

Discussion

10.	If the compacting factor of a concrete is 0.90, then what will be the workability according to Indian Standards?
A.	Very low
B.	Low
C.	Medium
D.	High
Answer» D. High

Discussion

11.	Consider the following statements regarding Cyclopean Concrete:1. Size of aggregate is more than 150 mm.2. Size of aggregate is less than 150 mm.3. High slump.4. High temperature rise due to heat of hydration.Which of the above statements are correct?
A.	1 and 3 only
B.	1 and 4 only
C.	2 and 3 only
D.	2 and 4 only
Answer» C. 2 and 3 only

Discussion

12.	Membrane curing is done by:
A.	applying paraffin or resin-based liquids on the surface of the concrete
B.	applying steam on the surface of the concrete
C.	ponding of water on the surface of the concrete
D.	applying spray of water on the surface of the concrete
Answer» B. applying steam on the surface of the concrete

Discussion

13.	In India, concrete mix design for RCC is carried out using IS _______ code.
A.	10262
B.	456
C.	373
D.	800
Answer» B. 456

Discussion

14.	On which one of the following factors, does strength of concrete depend primarily?
A.	Quality of coarse aggregate
B.	Quality of fine aggregate
C.	Fineness of cement
D.	Water – cement ratio
Answer» E.

Discussion

15.	According to IS 456-2000, the slump value (in mm) of the concrete used in ordinary RCC work for beams and slabs, etc.
A.	75 to 150
B.	25 to 50
C.	50 to 100
D.	20 to 30
Answer» D. 20 to 30

Discussion

16.	Fly ash addition to concrete helps in
A.	Improving workability, pumpability and accelerates early strength gain
B.	Reducing set time of concrete and improves finishibility
C.	Reducing the water demand, reducing the heat of hydration and delays the setting time of concrete
D.	Improves pumpability and reduces curing time
E.	Increasing the bleeding by reducing the heat of hydration
Answer» D. Improves pumpability and reduces curing time

Discussion

17.	Consider the following strengths of concrete:-a) Cube strengthb) Cylinder strengthc) Split tensile strengthd) Modulus of ruptureThe correct sequence in increasing order of these strength is:-
A.	c - d - a - b
B.	d - c - a - b
C.	c - d - b - a
D.	d - c - b - a
Answer» D. d - c - b - a

Discussion

18.	If the water-cement ratio in the concrete is high, then -a) Mixture will be strongb) Mixture will have good workabilityc) Mixture will be weakd) Bleeding will be lessNow which of the following statements is true?
A.	b and c
B.	a and b
C.	a and d
D.	c and d
Answer» B. a and b

Discussion

19.	Choose the correct statement.a) The strength of fully compacted concrete is inversely proportional to the water cement ratio.b) The strength of fully compacted concrete is directly proportional to the water cement ratio.
A.	Statement (a) is true
B.	Statement (b) is true
C.	Both the statements (a) and (b) are true
D.	Both the statements (a) and (b) are false
E.	Information insufficient
Answer» B. Statement (b) is true

Discussion

20.	Consider the following statements:Presence of Na2O and K2O in concrete leads to1. expansive reaction in concrete2. cracking of concrete3. disruption of concrete4. shrinkage of concreteWhich of the above statements are correct?
A.	1 and 2 only
B.	2 and 3 only
C.	1, 2 and 3
D.	3 and 4
Answer» D. 3 and 4

Discussion

21.	Plasticizers and superplasticizers are used to
A.	Reduce \(\frac{W}{C}\) ratio
B.	Increase workability
C.	Increase strength
D.	All of the above
Answer» E.

Discussion

22.	A concrete mix has entrapped air about 1% results in:
A.	Poor quality of concrete in terms of workability
B.	Average quality of concrete terms of workability
C.	Improved quality of concrete terms of workability
D.	Requires less quantity of water
Answer» D. Requires less quantity of water

Discussion

23.	Consider the following parameters of concrete:1. Impermeability2. Compactness3. Durability4. Desired consistency5. WorkabilityWhich of the above parameters are relevant for ‘water-cement ratio?
A.	4 and 5
B.	1 and 2
C.	2 and 4
D.	3 and 5
Answer» B. 1 and 2

Discussion

24.	As per IS 456:2000, the flexural strength of concrete at 28 days of ageing is related to compressive strength by the equation:
A.	\(0.7 \sqrt{fck}\)
B.	\(0.50 \sqrt{fck}\)
C.	\(1.25 \sqrt{fck}\)
D.	\(1.55 \sqrt{fck}\)
E.	\(2.75 \sqrt{fck}\)
Answer» B. \(0.50 \sqrt{fck}\)

Discussion

25.	Main ingredients of concrete are cement, fine aggregate and _______
A.	Soil
B.	Coarse aggregate
C.	Pond ash
D.	Quarry dust
Answer» C. Pond ash

Discussion

26.	In mix design the proportion 1 : 2 : 4 means:
A.	2 part of cement is mixed with 1 part of sand and 4 part of coarse aggregate
B.	1 part of cement is mixed with 4 part of sand and 2 part of coarse aggregate
C.	1 part of cement is mixed with 2 part of sand and 4 part of coarse aggregate
D.	4 part of cement is mixed with 2 part of sand and 1 part of coarse aggregate
Answer» D. 4 part of cement is mixed with 2 part of sand and 1 part of coarse aggregate

Discussion

27.	Match List-I (Admixtures) with List-II (Chemicals) and select correct answer using the codes given below the lists:List IList II(A) Water reducing admixture1. Sulphonated melanin(B) Air entraining agent2. Calcium chloride(C) Super plasticizer3. Lignosulphonate(D) Accelerator4. Neutralized vinsol resin
A.	A – 2, B – 4, C – 1, D – 3
B.	A – 1, B – 3, C – 4, D – 2
C.	A – 3, B – 4, C – 1, D – 2
D.	A – 3, B – 4, C – 2, D – 1
Answer» D. A – 3, B – 4, C – 2, D – 1

Discussion

28.	Consider the following statements:1) Rich mixes are less prone to bleeding than lean ones2) Bleeding can be reduced by increasing the fineness of cementWhich of the above statements is /are correct?
A.	1 only
B.	2 only
C.	Both 1 and 2
D.	neither 1 nor 2
Answer» D. neither 1 nor 2

Discussion

29.	Curing of concrete can be done by ______.
A.	Spraying
B.	Ponding
C.	Covering with moist cloth
D.	Any of these
Answer» E.

Discussion

30.	Addition of sugar in concrete results in _______
A.	Increase in setting time by about 1 hr
B.	Increase in setting time by about 4 hr
C.	Decrease in setting time by about 1 hr
D.	Decrease in setting time by about 4 hr
Answer» C. Decrease in setting time by about 1 hr

Discussion

31.	As the water/cement ratio increases, the permeability or concrete
A.	Remains unaffected
B.	Increases
C.	Decreases
D.	Uncertain
E.	Nominally changes
Answer» C. Decreases

Discussion

32.	Curing compounds are made with the bases of which of the following?
A.	Chlorinated rubber only
B.	All of the above
C.	Wax only
D.	Synthetic resin only
Answer» C. Wax only

Discussion

33.	One of the following measure could not reduce or eliminate plastic shrinkage cracks:
A.	Erect temporary wind breakers
B.	Concrete should be poured in layers
C.	Erect temporary roof
D.	Reduce the time between placing and finishing
Answer» E.

Discussion

34.	Approximate value of shrinkage strain in concrete is ______.
A.	0.03
B.	0.003
C.	0.0003
D.	3.0E-5
Answer» D. 3.0E-5

Discussion

35.	In case of RCC, sodium benzoate can be used for reducing
A.	Cracks
B.	Shrinkage
C.	Creep
D.	Corrosion
Answer» E.

Discussion

36.	If creep coefficient for concrete at 7 days is k1 and at 28 days is k2 then
A.	k1 > k2
B.	k1 < k2
C.	k1 = k2
D.	k1 ≤ k2
Answer» B. k1 < k2

Discussion

37.	In 4th amendment of IS 456-2000, M60 grade has been shifted
A.	to standard concrete from high strength concrete
B.	to high strength concrete from standard concrete
C.	to standard concrete from an ordinary concrete
D.	to ordinary concrete from a standard concrete
Answer» B. to high strength concrete from standard concrete

Discussion

38.	Consider the following statements concerning elasticity of concrete1. Stress-strain behaviour of concrete is a straight line up to 10% of ultimate stress.2. Strain determination is obtained from tangent modulus.3. Modulus of elasticity, of concrete is also called as secant modulus.Which of the above statements are correct?
A.	1, 2 and 3
B.	1 and 3 only
C.	1 and 2 only
D.	2 and 3 only
Answer» E.

Discussion

39.	Harsh mix of concrete
A.	Lacks plasticity
B.	Is cohesive
C.	Has high cement content
D.	Can be easily moulded
Answer» B. Is cohesive

Discussion

40.	If the age of loading increases, the creep coefficient for concrete will:
A.	remain constant
B.	increase if age of loading is greater than 28 days, otherwise it will decrease
C.	increase
D.	decrease
Answer» E.

Discussion

41.	Brass cannot be used as reinforcement in concrete because
A.	Its density is greater than concrete
B.	It density is smaller than iron
C.	It is very expensive
D.	Its coefficient of thermal expansion is higher than concrete
Answer» E.

Discussion

42.	Air entrainment Portland cementi) offers great resistance to sulphate attackii) offers great resistance to freezing and thawingiii) reduces the possibility of shrinkage and crack formation in the concrete surfaceiv) is suitable for mass concreting
A.	Only i)
B.	i) and ii)
C.	i), ii) and iii)
D.	i), ii), iii) and iv)
Answer» D. i), ii), iii) and iv)

Discussion

43.	A concrete in which dry coarse aggregate are first packed to have the least voids and then the cement sand mortar is injected under pressure to fill all the voids, resulting in a very dense concrete, is known as ______.
A.	Pre-packed concrete
B.	Vacuum concrete
C.	No fines concrete
D.	Aerate concrete
Answer» B. Vacuum concrete

Discussion

44.	In M 20 grade concrete, the ratio of cement: sand: ballast will be -
A.	1 : 3 : 6
B.	1 : 1 1.5 : 3
C.	1 : 1 : 2
D.	1 : 2 : 4
Answer» C. 1 : 1 : 2

Discussion

45.	__________slows down the chemical reaction of hydration.
A.	Retarder
B.	Plasticizer
C.	Super plasticizer
D.	Accelerator
Answer» B. Plasticizer

Discussion

46.	For a normal RCC work, the slump of concrete should be in the range of
A.	0 - 25 mm
B.	25 – 50 mm
C.	80 – 150 mm
D.	50 – 125 mm
Answer» D. 50 – 125 mm

Discussion

47.	For aggregate ratio of order of ______, the workability is independent of the aggregate Cement Ratio.
A.	1
B.	1.5
C.	2
D.	3
Answer» D. 3

Discussion

48.	If the compressive strength of concrete increases, then tensile strength is also increases, but at a ______.
A.	Increasing rate
B.	Decreasing rate
C.	Constant rate
D.	Expontential increasing rate
Answer» C. Constant rate

Discussion

49.	Consider the following statements:1. If more water is added to concrete for increasing its workability, it results into concrete of low strength.2. No slump is an indication of a good workable concrete.3. Higher the slump of concrete, lower will be its workability.4. Workability of concrete is affected by water content as well as water-cement ratio.Which of the above statements are correct?
A.	1 and 3 only
B.	2 and 3 only
C.	1 and 4 only
D.	2 and 4 only
Answer» D. 2 and 4 only

Discussion

50.	Consider the following statements related to non-destructive testing of concrete:1. Indentation test is used to assess the quality of concrete.2. Resonant Frequency method is based on a laboratory test.3. Compressive strength of concrete is estimated through Pulse Velocity Measurement4. Dynamic Modulus of Elasticity is determined by a Sonometer Test.5. Thickness of concrete can be estimated by in-situ Rebound Hammer Test.Which of the above statements are correct?
A.	1, 2 and 3 only
B.	1, 2 and 5 only
C.	1, 2, 3 and 4 only
D.	1, 2, 3, 4 and 5
Answer» D. 1, 2, 3, 4 and 5

Discussion

Explore topic-wise MCQs in Construction Materials.

The strength of well compacted concrete with good workability is depended only on the _________

________ method is based on the principle that the densest concrete is achieved by proportioning its aggregate in such a manner that the heaviest weight of concrete for same volume is obtained.

For lean concrete bases and simple foundation for masonry walls ________ grades of concrete may be used.

The theory of formation of __________ is based on the phenomenon of the formation of voids.

Aerated concrete is produced by the addition of:

Non-uniform compaction may cause the concrete:

Polymer concrete is used specifically when desirable concrete is to be ______.

A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm2 intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly

If the compressive strength difference of the three test specimens is more than the following, then the test should be done again.

If the compacting factor of a concrete is 0.90, then what will be the workability according to Indian Standards?

Consider the following statements regarding Cyclopean Concrete:1. Size of aggregate is more than 150 mm.2. Size of aggregate is less than 150 mm.3. High slump.4. High temperature rise due to heat of hydration.Which of the above statements are correct?

Membrane curing is done by:

In India, concrete mix design for RCC is carried out using IS _______ code.

On which one of the following factors, does strength of concrete depend primarily?

According to IS 456-2000, the slump value (in mm) of the concrete used in ordinary RCC work for beams and slabs, etc.

Fly ash addition to concrete helps in

Consider the following strengths of concrete:-a) Cube strengthb) Cylinder strengthc) Split tensile strengthd) Modulus of ruptureThe correct sequence in increasing order of these strength is:-

If the water-cement ratio in the concrete is high, then -a) Mixture will be strongb) Mixture will have good workabilityc) Mixture will be weakd) Bleeding will be lessNow which of the following statements is true?

Choose the correct statement.a) The strength of fully compacted concrete is inversely proportional to the water cement ratio.b) The strength of fully compacted concrete is directly proportional to the water cement ratio.

Consider the following statements:Presence of Na2O and K2O in concrete leads to1. expansive reaction in concrete2. cracking of concrete3. disruption of concrete4. shrinkage of concreteWhich of the above statements are correct?

Plasticizers and superplasticizers are used to

A concrete mix has entrapped air about 1% results in:

Consider the following parameters of concrete:1. Impermeability2. Compactness3. Durability4. Desired consistency5. WorkabilityWhich of the above parameters are relevant for ‘water-cement ratio?

As per IS 456:2000, the flexural strength of concrete at 28 days of ageing is related to compressive strength by the equation:

Main ingredients of concrete are cement, fine aggregate and _______

In mix design the proportion 1 : 2 : 4 means:

Consider the following statements:1) Rich mixes are less prone to bleeding than lean ones2) Bleeding can be reduced by increasing the fineness of cementWhich of the above statements is /are correct?

Curing of concrete can be done by ______.

Addition of sugar in concrete results in _______

As the water/cement ratio increases, the permeability or concrete

Curing compounds are made with the bases of which of the following?

One of the following measure could not reduce or eliminate plastic shrinkage cracks:

Approximate value of shrinkage strain in concrete is ______.

In case of RCC, sodium benzoate can be used for reducing

If creep coefficient for concrete at 7 days is k1 and at 28 days is k2 then

In 4th amendment of IS 456-2000, M60 grade has been shifted

Harsh mix of concrete

If the age of loading increases, the creep coefficient for concrete will:

Brass cannot be used as reinforcement in concrete because

Air entrainment Portland cementi) offers great resistance to sulphate attackii) offers great resistance to freezing and thawingiii) reduces the possibility of shrinkage and crack formation in the concrete surfaceiv) is suitable for mass concreting

A concrete in which dry coarse aggregate are first packed to have the least voids and then the cement sand mortar is injected under pressure to fill all the voids, resulting in a very dense concrete, is known as ______.

In M 20 grade concrete, the ratio of cement: sand: ballast will be -

__________slows down the chemical reaction of hydration.

For a normal RCC work, the slump of concrete should be in the range of

For aggregate ratio of order of ______, the workability is independent of the aggregate Cement Ratio.

If the compressive strength of concrete increases, then tensile strength is also increases, but at a ______.