Grader is mainly used for:

Finishing, shaping and trimming

For protection from frost, concrete should be _______.

Adhesion between mortar and aggregate should be perfect

For a given environment, the most significant factor that influences the total shrinkage of concrete is:

Total amount of water added at the time of mixing.

Maximum size of the coarse aggregate used.

Pick up the incorrect statement from the following.While performing a preliminary test on concrete:

proportions of the material and water should be the same as to be used at the worksite

cement should be mixed by hand in order to maintain uniformity

concrete mix should be stored in air-tight containers

concrete ingredients should be kept at a temperature of 37° ± 2° C

An accelerating admixture added to concrete performs the following functions

Accelerates the deterioration of concrete

Accelerated water losses from concrete

Accelerates the curing of concrete

Increases rate of hydration of cement

Accelerates the deterioration of concrete

Accelerates the setting time of concrete

Poisson's ratio of concrete μ can be determined using the formula:Whereas V is pulse velocity (mm/s), n is the resonant frequency of longitudinal vibration (Hz) & L is the distance between transducers (mm)

\(\left( {\frac{V}{{2\;nL}}} \right) = \frac{{\left( {1 + \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)

\(\left( {\frac{V}{{2nL}}} \right) = \frac{{\left( {1 - \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)

\(\left( {\frac{V}{{2\;nL}}} \right) = \frac{{\left( {1 + \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)

\(\left( {\frac{{{V^2}}}{{2\;nL}}} \right) = \frac{{\left( {1 - \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)

\(\left( {\frac{{{V^2}}}{{2\;nL}}} \right) = \frac{{\left( {1 - {\mu ^2}} \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)

Abrams law formulated in 1919 states that the strength of concrete varies inversely with the water/cement ratio. Which of the following condition needs to be satisfied for this law to be applicable?

Compaction should be carried out with needle vibrators

Chemical admixtures must be used

The concrete should be fully compacted

Assertion A: Pozzolana is added to cement to increase early strength.Reason R: It reduces the heat of hydration.Which of the following is correct?

Both A and R are true, but R is not a correct explanation of A

Both A and R are true, and R is the correct explanation of A

Both A and R are true, but R is not a correct explanation of A

For a given aggregate ratio increasing the water cement ratio:

Does not cause any change in shrinkage.

For verifying characteristics compressive strength the M25 grade of concrete, which is the test done in the laboratory as per IS 456?

Compression test on 10cm cubes at 28 days

Compression test on 15 cm cubes at 28 days

Compression test on 10cm cubes at 28 days

Split test on 15 cm dia cylinder on 28 days

Compression test on 15 cm cubes at 7 days

Polymer concrete is most suitable for

Insulating exterior walls of an air-conditioned building

In PCC (Plain Cement Concrete) of ratio 1 : 2 : 4, the ratios stand for which of the following?

Cement : Coarse aggregate : Fine aggregate

Water : Cement : Fine aggregate

Fine aggregate : Coarse aggregate : Cement

Cement : Fine aggregate : Coarse aggregate

Cement : Coarse aggregate : Fine aggregate

116 + Mcqs in Proportioning Concrete Page 2 McqOptions

51.	Good quality sand is never obtained from which of the following source?
A.	riverbed
B.	Nala
C.	sea
D.	gravel powder
Answer» C. sea

Discussion

52.	M15 mix concrete refers to mix proportion of (cement : fine aggregate : coarse aggregate)
A.	1 ∶ 1 ∶ 2
B.	1 ∶ 1.5 ∶ 3
C.	1 ∶ 2 ∶ 4
D.	1 ∶ 3 ∶ 6
Answer» D. 1 ∶ 3 ∶ 6

Discussion

53.	Creep strains in concrete structure are usually ______.
A.	independent of loads
B.	caused by wind loads
C.	caused by earthquake loads
D.	caused by sustained loads
Answer» E.

Discussion

54.	Grader is mainly used for:
A.	trimming and finishing
B.	shaping and trimming
C.	finishing and shaping
D.	Finishing, shaping and trimming
Answer» E.

Discussion

55.	For protection from frost, concrete should be _______.
A.	Dense
B.	Free from cracks
C.	Adhesion between mortar and aggregate should be perfect
D.	All the options are correct
Answer» E.

Discussion

56.	For a given environment, the most significant factor that influences the total shrinkage of concrete is:
A.	Cement content of mix.
B.	Total amount of water added at the time of mixing.
C.	Size of the member concreted.
D.	Maximum size of the coarse aggregate used.
Answer» C. Size of the member concreted.

Discussion

57.	On which of the following factors, does strength of concrete depends primarily
A.	Water cement ratio
B.	Quality of fine aggregate
C.	Fineness of cement
D.	Quality of course aggregate
Answer» B. Quality of fine aggregate

Discussion

58.	Generally the ratio of different ingredients (Cement Sand and aggregate) in concrete mix of grade M20 is:
A.	1: 2: 4
B.	1: 1.5: 3
C.	1: 3: 6
D.	1: 1: 2
Answer» C. 1: 3: 6

Discussion

59.	Concrete is kept moist for a certain period of time after placement and finishing to enhance its strength and durability. This is called_______.
A.	Curing
B.	Buttressing
C.	Nogging
D.	Shoring
Answer» B. Buttressing

Discussion

60.	Pick up the incorrect statement from the following.While performing a preliminary test on concrete:
A.	proportions of the material and water should be the same as to be used at the worksite
B.	cement should be mixed by hand in order to maintain uniformity
C.	concrete mix should be stored in air-tight containers
D.	concrete ingredients should be kept at a temperature of 37° ± 2° C
Answer» E.

Discussion

61.	A compaction factor of 0.88 indicates that the workability of concrete mix is
A.	Very low
B.	Low
C.	Medium
D.	High
Answer» D. High

Discussion

62.	For which of the following grades ordinary concrete is not used?
A.	M10
B.	M40
C.	M20
D.	M15
Answer» C. M20

Discussion

63.	An accelerating admixture added to concrete performs the following functions
A.	Accelerated water losses from concrete
B.	Accelerates the curing of concrete
C.	Increases rate of hydration of cement
D.	Accelerates the deterioration of concrete
E.	Accelerates the setting time of concrete
Answer» D. Accelerates the deterioration of concrete

Discussion

64.	Poisson's ratio of concrete μ can be determined using the formula:Whereas V is pulse velocity (mm/s), n is the resonant frequency of longitudinal vibration (Hz) & L is the distance between transducers (mm)
A.	\(\left( {\frac{V}{{2nL}}} \right) = \frac{{\left( {1 - \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)
B.	\(\left( {\frac{V}{{2\;nL}}} \right) = \frac{{\left( {1 + \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)
C.	\(\left( {\frac{{{V^2}}}{{2\;nL}}} \right) = \frac{{\left( {1 - \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)
D.	\(\left( {\frac{{{V^2}}}{{2\;nL}}} \right) = \frac{{\left( {1 - {\mu ^2}} \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)
Answer» B. \(\left( {\frac{V}{{2\;nL}}} \right) = \frac{{\left( {1 + \mu } \right)}}{{\left( {1 - 2\mu } \right)\left( {1 + \mu } \right)}}\)

Discussion

65.	Concrete in the member represented by core test shall be considered acceptable if the average equivalent cube strength of cores is equal to at least __________% of cube strength of the grade of concrete specified for the corresponding age.
A.	85
B.	50
C.	90
D.	70
Answer» B. 50

Discussion

66.	In which of the following, the concrete is dropped from a height to measure its workability
A.	Slump Test
B.	Vee Bee test
C.	Compaction factor test
D.	Flow test
Answer» D. Flow test

Discussion

67.	Consider the following statements:The addition of surfactants in the concrete mix results in:1. increase in the water-cement ratio2. decrease in the water-cement ratio3. increase in the strength of concrete4. decrease in the curing duration5. increase in the density of concreteWhich one of the following statements is correct?
A.	3, 4 and 5 only
B.	2, 3 and 5 only
C.	1, 3 and 4 only
D.	1, 4 and 5 only
Answer» C. 1, 3 and 4 only

Discussion

68.	In the concrete mix with proportions of its ingredient 1:3:6, the actual quantity of sand per unit volume of cement, if bulking of the sand is 15% is ______.
A.	3
B.	3.45
C.	6
D.	4.5
Answer» C. 6

Discussion

69.	Group I contains representative stress-strain curves as shown in the figure, while Group II gives the list of materials. Match the stress-strain curves with the corresponding materials.Group IGroup IIP. Curve J1. Cement pasteQ. Curve K2. Coarse aggregateR. Curve L3. Concrete
A.	P - 1; Q - 3; R - 2
B.	P - 2; Q - 3; R - 1
C.	P - 3; Q - 1; R - 2
D.	P - 3; Q - 2; R - 1
Answer» C. P - 3; Q - 1; R - 2

Discussion

70.	Abrams law formulated in 1919 states that the strength of concrete varies inversely with the water/cement ratio. Which of the following condition needs to be satisfied for this law to be applicable?
A.	Cement should of good quality
B.	Water should be clean
C.	Compaction should be carried out with needle vibrators
D.	Chemical admixtures must be used
E.	The concrete should be fully compacted
Answer» F.

Discussion

71.	Calculate the approximate number of cement bags required for preparing wet concrete of 10 m3 by volume in 1 ∶ 3 ∶ 6 mix proportion. Consider dry volume of concrete to be 1.54 m3 per cubic metre of wet concrete.
A.	50 bags
B.	45 bags
C.	35 bags
D.	40 bags
Answer» C. 35 bags

Discussion

72.	Assertion A: Pozzolana is added to cement to increase early strength.Reason R: It reduces the heat of hydration.Which of the following is correct?
A.	A is true but R is false.
B.	Both A and R are true, and R is the correct explanation of A
C.	A is false but R is true
D.	Both A and R are true, but R is not a correct explanation of A
Answer» D. Both A and R are true, but R is not a correct explanation of A

Discussion

73.	Appearance of fluffy white patches on the structure caused by poorly washed aggregates is called
A.	Sulphate deterioration
B.	Lai
C.	Crazing
D.	Efflorescence
Answer» E.

Discussion

74.	Permeability in concrete is studied towards providing for, or guarding against, which of the following features?1. The penetration by materials in solution may adversely affect the durability of concrete; moreover, aggressive liquids 'attack' the concrete.2. In the case of reinforced concrete, ingress of moisture and air will result in corrosion of steel leading to an increase in the volume of steel, resulting in cracking and swilling of the concrete cover.3. The moisture penetration depends on permeability and if the concrete can become saturated with water it is less vulnerable to frost action.
A.	1, 2 and 3
B.	1 and 2 only
C.	1 and 3 only
D.	2 and 3 only
Answer» C. 1 and 3 only

Discussion

75.	If light weight aggregates are used, then the density of conventional concrete is______.
A.	980 to 2540 kg/m3
B.	1760 to 1280 kg/m3
C.	2540 to 2560 kg/m3
D.	480 to 1760 kg/m3
Answer» E.

Discussion

76.	According to IS 456-2000, the minimum grade of concrete with maximum free water to cement ratio of 0.5 and minimum cement content of 300 kg/m3 is
A.	M20
B.	M30
C.	M25
D.	M35
Answer» D. M35

Discussion

77.	Pozzolana used as an admixture in concrete has the following advantages:1. It improves workability with lesser amount of water.2. It increases the heat of hydration and so lets the concrete set quickly.3. It increases the resistance of concrete to attack by salts and sulphates.4. It leaches out calcium hydroxide. Select the correct answer using the codes given below:
A.	1, 2 and 3 only
B.	1, 2 and 4 only
C.	1, 3 and 4 only
D.	2, 3 and 4 only
Answer» D. 2, 3 and 4 only

Discussion

78.	Group I gives a list of test methods and test apparatus for evaluating some of the properties of Ordinary Portland Cement (OPC) and concrete Group II gives the list of these properties.Group IP. Le Chatelier testQ. Vee – Bee testR. Blaine air permeability testS. The Vicat apparatusGroup-II1. Soundness of OPC2. Consistency and setting time of OPC3. Consistency or workability of concrete4. Fineness of OPCThe correct match of the items in Group I with items in Group II is
A.	P-1, Q-3, R-4, S-2
B.	P-2, Q-3, R-1, S-4
C.	P-4, Q-2, R-4, S-1
D.	P-1, Q-4, R-2, S-3
Answer» B. P-2, Q-3, R-1, S-4

Discussion

79.	Consider the following statements for air-entrained concrete:(i) Air-entrainment reduces the water demand for a given level of workability.(ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expectedWhich of the following is TRUE?
A.	Both (i) and (ii) are True
B.	Both (i) and (ii) are False
C.	(i) is True and (ii) is False
D.	(i) is False and (ii) is True
Answer» B. Both (i) and (ii) are False

Discussion

80.	A tensile strength of concrete is determined by
A.	Cube test
B.	Flexural test
C.	Box shear test
D.	Axial tensile test
Answer» C. Box shear test

Discussion

81.	A 10 cm cube is used for concrete testing when the nominal size of the ballast is not more than
A.	15 mm
B.	20 mm
C.	25 mm
D.	10 mm
Answer» C. 25 mm

Discussion

82.	Consider the following statements:1) workability of concrete increases with the increase in the proportion of water content2) Concrete having small-sized aggregates is more workable than that containing large-sized aggregate3) For the same quantity of water, rounded aggregates produce a more workable concrete mix as compared to angular and flaky aggregates4) A concrete mix with no slump shown in the slump cone test indicates its very poor workabilityWhich of the above statements are correct?
A.	1, 2 and 3 only
B.	1, 2 and 4 only
C.	1, 3 and 4 only
D.	2, 3 and 4 only
Answer» D. 2, 3 and 4 only

Discussion

83.	For a given aggregate ratio increasing the water cement ratio:
A.	Increases the strength
B.	Decreases shrinkage
C.	Increases shrinkage
D.	Does not cause any change in shrinkage.
Answer» D. Does not cause any change in shrinkage.

Discussion

84.	For reinforced concrete structures to be constructed along sea coast minimum grade of concrete should be
A.	M15
B.	M20
C.	M30
D.	M25
Answer» D. M25

Discussion

85.	Approximately how many hours it will take for a concrete batching and mixing plant of rated capacity 120 cum/h and working at an efficiency of 80% to produce concrete required for a base slab of 1920 cum?
A.	16.0
B.	12.8
C.	160.0
D.	16.4
E.	20.0
Answer» F.

Discussion

86.	______ are used to finish concrete surfaces such as bridge floors, road slabs
A.	Immersion vibrators
B.	Surface vibrators
C.	Form vibrators
D.	Internal vibrators
Answer» C. Form vibrators

Discussion

87.	For verifying characteristics compressive strength the M25 grade of concrete, which is the test done in the laboratory as per IS 456?
A.	Compression test on 15 cm cubes at 28 days
B.	Compression test on 10cm cubes at 28 days
C.	Split test on 15 cm dia cylinder on 28 days
D.	Compression test on 15 cm cubes at 7 days
Answer» B. Compression test on 10cm cubes at 28 days

Discussion

88.	As per IS 456, The pH value of water shall not be less than_______.
A.	4
B.	6
C.	8
D.	None of the above
Answer» C. 8

Discussion

89.	The size of aggregate, particle shape, colour, surface texture, all of which have influence on the durability of concrete should conform to
A.	IS 383 - 1970
B.	IS 1489 - 1976
C.	IS 12269 - 1987
D.	IS 456 - 2000
Answer» B. IS 1489 - 1976

Discussion

90.	Concrete contains ______
A.	Cement
B.	Coarse aggregate
C.	Fine aggregate
D.	All of above
Answer» E.

Discussion

91.	As per IS: 456 – 1978, the concrete mixes have been designated into 7 grades. Which one out of the following seven grades (given below) is not the correct grade of concrete mix?M100, M200, M250, M150, M50, M350, M300
A.	M100
B.	M50
C.	M350
D.	M300
Answer» C. M350

Discussion

92.	Polymer concrete is most suitable for
A.	Sewage disposal works
B.	Mass concreting works
C.	Insulating exterior walls of an air-conditioned building
D.	Road repair works
Answer» B. Mass concreting works

Discussion

93.	Cement concrete is a
A.	Elastic material
B.	Visco-elastic material
C.	Non elastic material
D.	Plastic material
Answer» C. Non elastic material

Discussion

94.	Consider the following statements:High early strength of cement is obtained as a result of1. Fine grinding2. decreasing the lime content3. Burning at higher temperatures4. Increasing the quantity of gypsumOf these statements
A.	1 and 2 are correct
B.	1 and 3 are correct
C.	2, 3 and 4 are correct
D.	1, 3 and 4 are correct
Answer» C. 2, 3 and 4 are correct

Discussion

95.	In PCC (Plain Cement Concrete) of ratio 1 : 2 : 4, the ratios stand for which of the following?
A.	Water : Cement : Fine aggregate
B.	Fine aggregate : Coarse aggregate : Cement
C.	Cement : Fine aggregate : Coarse aggregate
D.	Cement : Coarse aggregate : Fine aggregate
Answer» D. Cement : Coarse aggregate : Fine aggregate

Discussion

96.	As per IS 456:2000, the permissible limit for sulphates in water to be used for making concrete is
A.	100 mg/lit
B.	200 mg/lit
C.	400 mg/lit
D.	500 mg/lit
Answer» D. 500 mg/lit

Discussion

97.	Consider the following statements:The addition of CaCl2 in concrete results in1. increased shrinkage2. decreased setting time3. decreased shrinkage4. increased setting timeWhich of the above statements is/ are correct?
A.	1 Only
B.	2 and 3
C.	3 and 4
D.	1 and 2
Answer» E.

Discussion

98.	In a non-tilting type drum mixer,1. Large size aggregate up to 20 – 25 cm can be handled2. Mixing time is less than 2 minutes3. Discharge is through buckets onto the platform4. For large-size mixers, the mixing time should be slightly increased if handling more than 800 litres of the mixWhich of the above statements are correct?
A.	1 and 2 only
B.	2 and 3 only
C.	1, 2 and 4 only
D.	3 and 4 only
Answer» E.

Discussion

99.	Aerated concrete is ______ in weight.
A.	Heavy
B.	Light
C.	Medium
D.	Very heavy
Answer» C. Medium

Discussion

100.	For the construction of concrete, the concentration of sulfate anhydride in mixed water should not exceed ______.
A.	2000 ppm
B.	1000 ppm
C.	3000 ppm
D.	4000 ppm
Answer» D. 4000 ppm

Discussion

Explore topic-wise MCQs in Construction Materials.

Good quality sand is never obtained from which of the following source?

M15 mix concrete refers to mix proportion of (cement : fine aggregate : coarse aggregate)

Creep strains in concrete structure are usually ______.

Grader is mainly used for:

For protection from frost, concrete should be _______.

For a given environment, the most significant factor that influences the total shrinkage of concrete is:

On which of the following factors, does strength of concrete depends primarily

Generally the ratio of different ingredients (Cement Sand and aggregate) in concrete mix of grade M20 is:

Concrete is kept moist for a certain period of time after placement and finishing to enhance its strength and durability. This is called_______.

Pick up the incorrect statement from the following.While performing a preliminary test on concrete:

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

For which of the following grades ordinary concrete is not used?

An accelerating admixture added to concrete performs the following functions

Poisson's ratio of concrete μ can be determined using the formula:Whereas V is pulse velocity (mm/s), n is the resonant frequency of longitudinal vibration (Hz) & L is the distance between transducers (mm)

Concrete in the member represented by core test shall be considered acceptable if the average equivalent cube strength of cores is equal to at least __________% of cube strength of the grade of concrete specified for the corresponding age.

In which of the following, the concrete is dropped from a height to measure its workability

In the concrete mix with proportions of its ingredient 1:3:6, the actual quantity of sand per unit volume of cement, if bulking of the sand is 15% is ______.

Group I contains representative stress-strain curves as shown in the figure, while Group II gives the list of materials. Match the stress-strain curves with the corresponding materials.Group IGroup IIP. Curve J1. Cement pasteQ. Curve K2. Coarse aggregateR. Curve L3. Concrete

Abrams law formulated in 1919 states that the strength of concrete varies inversely with the water/cement ratio. Which of the following condition needs to be satisfied for this law to be applicable?

Calculate the approximate number of cement bags required for preparing wet concrete of 10 m3 by volume in 1 ∶ 3 ∶ 6 mix proportion. Consider dry volume of concrete to be 1.54 m3 per cubic metre of wet concrete.

Assertion A: Pozzolana is added to cement to increase early strength.Reason R: It reduces the heat of hydration.Which of the following is correct?

Appearance of fluffy white patches on the structure caused by poorly washed aggregates is called

If light weight aggregates are used, then the density of conventional concrete is______.

According to IS 456-2000, the minimum grade of concrete with maximum free water to cement ratio of 0.5 and minimum cement content of 300 kg/m3 is

Consider the following statements for air-entrained concrete:(i) Air-entrainment reduces the water demand for a given level of workability.(ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expectedWhich of the following is TRUE?

A tensile strength of concrete is determined by

A 10 cm cube is used for concrete testing when the nominal size of the ballast is not more than

For a given aggregate ratio increasing the water cement ratio:

For reinforced concrete structures to be constructed along sea coast minimum grade of concrete should be

Approximately how many hours it will take for a concrete batching and mixing plant of rated capacity 120 cum/h and working at an efficiency of 80% to produce concrete required for a base slab of 1920 cum?

______ are used to finish concrete surfaces such as bridge floors, road slabs

For verifying characteristics compressive strength the M25 grade of concrete, which is the test done in the laboratory as per IS 456?

As per IS 456, The pH value of water shall not be less than_______.

​The size of aggregate, particle shape, colour, surface texture, all of which have influence on the durability of concrete should conform to

Concrete contains ______

As per IS: 456 – 1978, the concrete mixes have been designated into 7 grades. Which one out of the following seven grades (given below) is not the correct grade of concrete mix?M100, M200, M250, M150, M50, M350, M300

Polymer concrete is most suitable for

Cement concrete is a

Consider the following statements:High early strength of cement is obtained as a result of1. Fine grinding2. decreasing the lime content3. Burning at higher temperatures4. Increasing the quantity of gypsumOf these statements

In PCC (Plain Cement Concrete) of ratio 1 : 2 : 4, the ratios stand for which of the following?

As per IS 456:2000, the permissible limit for sulphates in water to be used for making concrete is

Consider the following statements:The addition of CaCl2 in concrete results in1. increased shrinkage2. decreased setting time3. decreased shrinkage4. increased setting timeWhich of the above statements is/ are correct?

Aerated concrete is ______ in weight.

For the construction of concrete, the concentration of sulfate anhydride in mixed water should not exceed ______.

The size of aggregate, particle shape, colour, surface texture, all of which have influence on the durability of concrete should conform to