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Home/ Concrete/Concrete Technology Solved MCQs

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On: July 11, 2023 Posted in Concrete, Internet Comments: 0 Views: 43

Concrete Technology Solved MCQs

1.Processes of cement manufacturing is…….?
A.Wet process
B.Dry process
C.Semi-dry process
D.All of above
Answer» D. All of above

2.After 28 days of curing, cement gains have been found to have hydrated to a depth of only…..u.
A.2
B.3
C.4
D.6
Answer» C. 4

 (1)

3.Total…….. % of water by weight of water by weight of cement is required for complete hydration.
A.40
B.38
C.42
D.50
Answer» B. 38

4.Hydration of cement is due to chemical action of water with
A.Tricalcium silicate and dicalcium silicate
B.Dicalcium silicate and tricalcium aluminate
C.Tricalcium aluminate and tricalcium alumino ferrite
D.All the above.
Answer» D. All the above.

5.Proper proportioning of concrete, ensures
A.desired strength and workability
B.desired durability
C.water tightness of the structure
D.all the above
Answer» D. all the above

6.An aggregate is said to be flaky if its least dimension is less than
A.1/5th of mean dimension
B.2/5th of mean dimension
C.3/5th of mean dimension
D.4/5th of mean dimension
Answer» C. 3/5th of mean dimension

7.A small quantity of …………. % of gypsum is added to prevent flash-setting of the cement.
A.1 to 2
B.2 to 3
C.9 to 10
D.10 to 12
Answer» B. 2 to 3

8.Highest oxide composition present in cement is……
A.Silica
B.Alumina
C.Iron oxides
D.Lime
Answer» D. Lime

9.First 7 days strength in cement is due to….. Bogue compound.
A.C3S
B.C2S
C.C3A
D.C4AF
Answer» A. C3S

10.Heat of hydration of C3S at 90 days is ………. cal/g
A.58
B.104
C.122
D.150
Answer» B. 104

11.…………refers to the gain of strength of a set cement paste.
A.Setting of cement
B.Hardening of cement
C.none
D.all
Answer» B. Hardening of cement

12.For long time storage ……..cement used.
A.Masonry cement
B.Ordinary
C.Hydrophobic
D.All of above
Answer» C. Hydrophobic

13.Repair of air-field pavement use……
A.Air entrained cement
B.Very high Strength cement
C.Rediset Cement
D.All of above
Answer» B. Very high Strength cement

14.Note more than ……. bags should be kept one above other.
A.20
B.25
C.14
D.Any of above
Answer» C. 14

15.For Fineness test ……. micron sieve is use.
A.100
B.80
C.60
D.90
Answer» D. 90

16.The weight of residue should not exceed ……. for OPC.
A.10 %
B.20 %
C.30%
D.40%
Answer» A. 10 %

17.For consistency test vicat plunger having ……. dia and …….. Length is used.
A.15 mm & 45 mm
B.10 mm & 50 mm
C.20 mm & 60mm
D.Any of above
Answer» B. 10 mm & 50 mm

18.For OPC Value of IST And FST is…… .
A.30 m & 600 m
B.50 m & 700 m
C.20m & 500 m
D.40m & 800 m
Answer» A. 30 m & 600 m

19.For compressive strength test of cement ………. water is added.
A.p/3 + 3
B.p/2 + 3
C.p/4 + 3
D.p/5 +3
Answer» C. p/4 + 3

20.Undesirable expansion of some of constituents of cement after setting is known as……… .
A.Soundness
B.unsoundness
C.none
D.all
Answer» B. unsoundness

21.Density of light weight aggregate concrete is about …….. kg/m3 .
A.3000
B.1500
C.1200
D.1400
Answer» C. 1200

22.Material between…………… is classified as silt.
A.002 mm to 0.003 mm
B.0.08 mm to 1 mm
C.8 mm to 10 mm
D.0.06 mm to 0.002 mm
Answer» D. 0.06 mm to 0.002 mm

23.Angular aggregate having percentage of voids ranging from……….
A.32 to 33
B.35 to 38
C.38 to 40
D.40 to 45
Answer» C. 38 to 40

24.In crushing value test of aggregate, gradually compressive load of….. Tons is apply.
A.40
B.50
C.44
D.45
Answer» A. 40

25.Specific gravity of natural aggregate lie between……
A.2.5 to 2.6
B.2.6 to 2.7
C.2.6 to 2.8
D.2.8 to 2.9
Answer» C. 2.6 to 2.8

26.Coarse aggregates absorbs…….. % of moisture.
A.1 to 2
B.0.5 to 1
C.2 to 4
D.2 to 3
Answer» B. 0.5 to 1

27.To control alkali aggregate reaction restricting alkali content in cement below……%
A.1
B.0.1
C.0.5
D.0.6
Answer» D. 0.6

28.If the actual grading curve is steeper than the specified grading curve, it indicates an excess of ……..particle size.
A.sand
B.coarser
C.medium
D.cement
Answer» C. medium

29.Fineness modulus of fine sand is…… .
A.2.2 – 2.6
B.2.6 – 2.9
C.2.9 – 3.2
D.3.2 – 4.2
Answer» A. 2.2 – 2.6

30.Permissible limit organic solids in water is……..mg/l
A.400
B.600
C.200
D.500
Answer» C. 200

31.Bigger size of aggregate will give higher workability.
A.True
B.False
C.none
D.all
Answer» A. True

32.To measure workability of concrete in field …………….test is used.
A.Flow test
B.Compacting factor test
C.Slump test
D.All of above
Answer» C. Slump test

33.Steel tamping rod of 0.6m length and 16 mm diameter is used for tamping of concrete.
A.False
B.True
C.none
D.all
Answer» B. True

34.Types of slump is…..
A.True slump
B.Shear slump
C.Collapse slump
D.All of above
Answer» D. All of above

35.25 to 75 mm workability of concrete, indicate
A.High workability
B.Medium workability
C.Low workability
D.Any of this
Answer» C. Low workability

36.In very low category of degree of workability determination by compacting factor will be more appropriate.
A.True
B.False
C.none
D.all
Answer» A. True

37.Compacting factor test should be made for concrete with maximum size of aggregate not exceeding 40 mm.
A.True
B.False
C.none
D.all
Answer» A. True

38.The value of flow % may range anything from 0 to …. %
A.200
B.250
C.210
D.150
Answer» D. 150

39.Separating out of the ingredients of concrete mix from concrete is known as……… .
A.Segregation
B.bleeding
C.separation
D.Any of these
Answer» A. Segregation

40.Water from concrete comes out to the surface of the concrete is known as……….
A.Segregation
B.bleeding
C.separation
D.Any of these
Answer» B. bleeding

41.Main causes of bleeding :
A.Highly wet mix
B.Badly proportion mix
C.Insufficiently mixed concrete
D.All of this
Answer» D. All of this

42.The formation of cement paste at the surface is known as laitance.
A.True
B.False
C.none
D.all
Answer» A. True

43.Workability of concrete is……. to the w/c.
A.proportional
B.inversely proportional
C.none
D.all
Answer» A. proportional

44.Workability of concrete is …….to the strength of concrete.
A.proportional
B.inversely proportional
C.none
D.all
Answer» B. inversely proportional

45.Good method for proportioning the materials.
A.Weight batching
B.Volume batching
C.none
D.all
Answer» A. Weight batching

46.In Volume batching 1 bag cement =
A.35 lit
B.40 lit
C.45 lit
D.50 lit
Answer» A. 35 lit

47.In volume batching………. % of bulking is take into account.
A.30
B.40
C.20
D.10
Answer» C. 20

48.Density of water is 1 kg/liter.
A.True
B.false
C.none
D.all
Answer» A. True

49.In hand mixing …….. % more cement is added in mix.
A.30
B.40
C.20
D.10
Answer» D. 10

50.Concrete mixer are generally designed to run at a speed of ……….. Revolution per minute.
A.40 to 50
B.30 to 40
C.15 to 20
D.20 to 30
Answer» C. 15 to 20

51.For proper mixing about…………. revolution are required.
A.40 to 50
B.30 to 40
C.15 to 20
D.25 to 30
Answer» D. 25 to 30

52.The process of mixing, transporting, placing and compacting concrete should not take more than ……. min any case.
A.90
B.80
C.70
D.60
Answer» A. 90

53.Commonly use retarders is……
A.Calcium sulphate
B.Sugars
C.Cellulose products.
D.All of the above
Answer» D. All of the above

54.Inert material of a cement concrete mix, is
A.water
B.cement
C.aggregate
D.none of these
Answer» C. aggregate

55.Placing of concrete should preferably be done at a temperature of
A.0°C
B.10°C
C.20°C
D.27 ± 2°C
Answer» D. 27 ± 2°C

56.The aggregate impact value of the aggregate used in
A.building concrete is less than 45
B.road pavement concrete is less than 30
C.runway concrete is less than 30
D.all the above.
Answer» D. all the above.

57.On a grading curve, the gap grading is represented by
A.a horizontal line
B.a vertical line
C.N.W. inclined line
D.N.E. inclined line
Answer» A. a horizontal line

58.Bulking of sand is
A.mixing of different sizes of sand particles
B.mixing of lime with sand
C.maximum water with sand
D.swelling of sand when wetted
Answer» D. swelling of sand when wetted

59.Curing of pavements, floors, roofs and slabs, is done by
A.membrane method
B.ponding method
C.covering surface with bags
D.sprinkling water method
Answer» B. ponding method

60.Pick up the incorrect statement from the following:
A.With passage of time, the strength of cement increases
B.With passage of time, the strength of cement decreases
C.After a period of 24 months, the strength of cement reduces to 50%
D.The concrete made with storage deteriorated cement, gains strength with time
Answer» A. With passage of time, the strength of cement increases

61.The surface where two successive placements of concrete meet, is known as
A.Contraction joint
B.Expansion joint
C.Construction joint
D.both (a) and (b)
Answer» C. Construction joint

62.An excess of flaky particles in concrete aggregates
A.decreases the workability
B.increases the quantity of water and sand
C.affects the durability of concrete
D.all the above
Answer» D. all the above

63.I.S.I. has specified the full strength of concrete after
A.7 days
B.14 days
C.21 days
D.28 days
Answer» D. 28 days

64.The minimum percentage of chemical ingredient of cement is that of
A.magnesium oxide
B.iron oxide
C.alumina
D.lime
Answer» A. magnesium oxide

65.The specifications of a cement bag for storage, are
A.weight 50 kg
B.height 18 cm
C.plan area 3000 sq. cm
D.all the above
Answer» D. all the above

66.The bulk density of aggregates, depends upon
A.shape
B.grading
C.compaction
D.all the above.
Answer» D. all the above.

67.The concrete mix which causes difficulty in obtaining a smooth finish, possess
A.segregation
B.internal friction
C.harshness
D.bleeding
Answer» C. harshness

68.An aggregate is known as cyclopean aggregate if its size is more than
A.4.75 mm
B.30 mm
C.60 mm
D.75 mm
Answer» D. 75 mm

69.The main object of compaction of concrete, is:
A.to eliminate air holes
B.to achieve maximum density
C.to provide intimate contact between the concrete and embedded materials
D.all the above
Answer» D. all the above

70.Concrete gains strength due to
A.chemical reaction of cement with sand and coarse aggregates
B.evaporation of water from concrete
C.hydration of cement
D.All the above
Answer» C. hydration of cement

71.If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
A.20.5 mm
B.30.5 mm
C.40.5 mm
D.50.5 mm
Answer» C. 40.5 mm

 (1)

72.Log Angles machine is used to test the aggregate for
A.crushing strength
B.impact value
C.abrasion resistance
D.water absorption
Answer» C. abrasion resistance

73.Pozzolanic properties exist in
A.shales
B.fly ash
C.pumicite
D.all the above
Answer» D. all the above

74.Workability improved by adding
A.fly ash
B.hydrated lime
C.calcium chloride
D.all the above
Answer» D. all the above

75.If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
A.M 10
B.M 15
C.M 20
D.M 30
Answer» A. M 10

76.Gypsum is added for
A.colour
B.strength
C.controlling setting time
D.none of these
Answer» C. controlling setting time

77.Cement used for normal concrete construction, is obtained by burning a mixture of
A.silicious and argillaceous materials
B.argilaceous and calcareous materials
C.silicious and catcareous materials
D.silicious, argillaceous and calcareous materials
Answer» D. silicious, argillaceous and calcareous materials

78.In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
A.20 times
B.25 times
C.30 times
D.40 times
Answer» B. 25 times

79.Efflorescence in cement is caused due to an excess of
A.alumina
B.iron oxide
C.silica
D.alkalis
Answer» D. alkalis

80.Slump test of concrete is a measure of its
A.consistency
B.compressive strength
C.tensile strength
D.impact value.
Answer» A. consistency

81.Pick up the incorrect statement applicable to the field test of good cement.
A.When one thrusts one’s hand into a bag of cement, one should feel warm
B.The colour of the cement is bluish
C.A handful of cement thrown into a bucket of water should sink immediately
D.All the above
Answer» D. All the above

82.The most useless aggregate is one whose surface texture is
A.smooth
B.granular
C.glassy
D.honey combed and porous
Answer» C. glassy

83.The top diameter, bottom diameter and the height of a slump mould are :
A.10 cm, 20 cm, 30 cm
B.10 cm, 30 cm, 20 cm
C.20 cm, 10 cm, 30 cm
D.20 cm, 30 cm, 10 cm
Answer» A. 10 cm, 20 cm, 30 cm

84.For concreting tunnel linings, transportation of concrete is done by
A.pans
B.wheel borrows
C.containers
D.pumps
Answer» D. pumps

85.Admixture which cause early setting and hardening of concrete are called …
A.Workability admixtures
B.accelerators
C.retarders
D.air entraining agents
Answer» B. accelerators

86.As compared to ordinary Portland cement, high alumina cement has
A.higher initial setting time but lower final setting time
B.lower initial setting time but higher final setting time
C.none
D.all
Answer» A. higher initial setting time but lower final setting time

87.Maximum permissible limit of magnesia content in OPC is…
A.4 %
B.6%
C.8%
D.10%
Answer» B. 6%

88.Reduction in the quantity of mixing water which is possible by the use of plasticizers and admixture varies from
A.1% to 5%
B.5% to 15%
C.15% to 25%
D.25% to 35%
Answer» B. 5% to 15%

89.Which of the following types of concrete mixture is most commonly used in precast concrete factories?
A.truck mounted mixture
B.pan type mixer
C.dual drum mixture
D.tilting drum mixture
Answer» B. pan type mixer

90.According to IS : 456-1978 minimum period stipulated for most curing of concrete using ordinary Portland cement is
A.3 days
B.7 days
C.14 days
D.28 days
Answer» B. 7 days

91.For reinforced concrete exposed to sulphate attack minimum grade required is
A.M10
B.M15
C.M20
D.M25
Answer» C. M20

92.The deterioration of concrete take place due to.
A.Salt solution
B.Alkalies
C.Fertilizers
D.All of the above
Answer» D. All of the above

93.Cement content should be such that concrete has sufficient alkalinity (PH value).
A.True
B.False
C.none
D.all
Answer» A. True

94.For sea water concreting …………. cement shall be used.
A.Portland slag cement
B.Portland pozzolana slag cement
C.Super sulphated cement
D.All of above
Answer» D. All of above

95.Durability of concrete can be improved by impregnation of …………… in the voids of concrete.
A.polymer
B.cement
C.Lime
D.Soda
Answer» A. polymer

96.What do you mean by admixtures?
A.Ingredients which are added to in cement before or after concrete mix
B.Ingredients which are added to make aggregates healthier
C.Ingredients added in cement to make it shinier
D.Ingredients added in concrete to make good workability
Answer» A. Ingredients which are added to in cement before or after concrete mix

97.Super plasticizers reduce water requirement by ___________ %.
A.12-30
B.10-15
C.30-42
D.48
Answer» A. 12-30

98.Damp proofing is done with a __________ based mixture.
A.Sand
B.Tar
C.Rubber
D.Lead
Answer» B. Tar

99.What is water proofing admixtures?
A.Water repellent materials
B.Water fair material
C.Water absorption material
D.Water adsorption material
Answer» A. Water repellent materials

100.Which one is not a chemically active pore filling material?
A.Silicate of soda
B.Aluminium
C.Chalk
D.Zinc
Answer» B. Aluminium

101.What are plasticizers?
A.Which adds water for workability
B.Which reduces water for workability
C.Which decreases workability at the same water content
D.Which oxidizes water for workability
Answer» B. Which reduces water for workability

102.What is the amount used of plasticizers in cement by weight?
A.0
B.1-.4%
C.1%
D.1-2%
Answer» B. 1-.4%

103.What is the allowed reduction of water with super plasticizers without reducing workability?
A.10%
B.20%
C.30%
D.40%
Answer» C. 30%

104.What is accelerator?
A.Which speed up the initial set of concrete
B.Which delays the initial set of concrete
C.Which speed up the final set of concrete
D.Which delays the final set of concrete
Answer» A. Which speed up the initial set of concrete

105.What is retender?
A.Which speed up the initial set of concrete
B.Which delays the initial set of concrete
C.Which speed up the final set of concrete
D.Which delays the final set of concrete
Answer» B. Which delays the initial set of concrete

106.NaOH is the example of retenders.
A.True
B.False
C.none
D.all
Answer» B. False

107.Pick up the correct statement from the following.
A.Calcium fluosilicates act as a retarders
B.CaCl2 acts as a retarders
C.Gypsum acts as a retarders
D.Gypsum acts as an accelerators
Answer» C. Gypsum acts as a retarders

108.Retarders used at grouting oil wells, where temperature is about _____________ oC.
A.100
B.150
C.200
D.250
Answer» C. 200

109.Silica fume is ______________
A.Less reactive
B.Neutral
C.More reactive
D.Absent in concrete
Answer» C. More reactive

110.What is the content of SiO2 in fly ash?
A.30-60%
B.15-30%
C.Up to 30%
D.1-7%
Answer» A. 30-60%

111.Air entrainment in concrete increases ___________
A.Strength
B.Workability
C.The effect of temp variations
D.The unit weight
Answer» B. Workability

112.What is curing?
A.Dehydration
B.Hydration
C.Drying
D.Dipping
Answer» B. Hydration

113.What is the gel/space ratio?
A.Volume of water to the volume of cement
B.Volume of the hydrated cement paste to the sum of volumes of the hydrated cement
C.Volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores
D.Volume of gel to the volume of space present in the concrete
Answer» C. Volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores

114.Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here Wo stands for?
A.Weight of cement in kg
B.Weight of cement in g
C.Volume of gel
D.Volume of mixing water in ml
Answer» D. Volume of mixing water in ml

115.This strain increases over time due to _________
A.Creep
B.Elastic modulus
C.Short term modulus of elasticity
D.Long term modulus of elasticity
Answer» A. Creep

116.If the stress is removed, the specimen shows an instantaneous recovery strain ___ the elastic strain on loading.
A.Higher than
B.Lower than
C.Equal to
D.Much greater than
Answer» B. Lower than

117.Creep ___ as the age of application of load _____
A.Increase, increase
B.Increase, decrease
C.Decrease, decrease
D.Decrease, increase
Answer» D. Decrease, increase

118.Shrinkage is the reduction in the volume of a fresh hardened concrete exposed to ambient temp and humidity.
A.True
B.False
C.none
D.all
Answer» A. True

119.Durability of concrete is proportional to _________
A.Sand content
B.Water cement ratio
C.Aggregate ratio
D.Cement aggregate ratio
Answer» D. Cement aggregate ratio

120.For concrete exposed to a very aggressive environment the w/c should be lower than __________
A.1
B..5
C.4
D..8
Answer» C. 4

121.The quality of concrete, specifically a ____________ w/c ratio, is the best protection against sulphate attack.
A.High
B.Medium
C.Low
D.Very low
Answer» C. Low

122.The continuous strain, which the concrete undergoes due to application of external loads, is called __________
A.Workability
B.Segregation
C.Bleeding
D.Creep
Answer» D. Creep

123.Harshness in concrete is due to the excess of _____________
A.Water
B.Finer particles
C.Middle sized particle
D.Coarser particle
Answer» C. Middle sized particle

124.__________ has designated the concrete mixes into a number of grades as M10, M15.
A.IS 456-2000
B.IS 456-2010
C.IS 513-1999
D.IS 465-2000
Answer» A. IS 456-2000

125.What is the approx. mix proportion for M10?
A.1:3:6
B.1:2:4
C.1:1.5:3
D.1:1:2
Answer» A. 1:3:6

126.Quality control helps to ___________ the risks of overdesign that ___________ the overall cost.
A.Maximize, Increase
B.Minimize, Increase
C.Maximize, Decrease
D.Minimize, Decrease
Answer» D. Minimize, Decrease

127.The cement concrete, from which entrained air and excess water are removed after placing it in position, is called ________
A.Vacuum concrete
B.LWC
C.Prestressed concrete
D.Sawdust concrete
Answer» A. Vacuum concrete

128.The light-weight concrete is prepared by ____________
A.Mixing Portland cement with sawdust in specified proportion in the concrete
B.Using coke-breeze, slag as aggregate in the concrete
C.Mixing Al in the concrete
D.Mixing Fe in the concrete
Answer» B. Using coke-breeze, slag as aggregate in the concrete

129.Aerated Concrete is ______________
A.Very heavy weight
B.Heavy weight
C.Medium weight
D.Light weight
Answer» D. Light weight

130.No fines concrete is manufactured by _____________
A.By adding no fines materials from normal concrete
B.By eliminating no fines materials from normal concrete
C.By reducing its strength
D.By increasing its strength
Answer» B. By eliminating no fines materials from normal concrete

131.Density of no fines concrete with light weight aggregate vary from ________ kg/m3.
A.1600-1900
B.<300
C.>2500
D.>300
Answer» B. <300

132.Diameter of Round Steel Fiber lies in the range of ________ mm.
A..3-.5
B..25-.75
C..155-.41
D..25-.90
Answer» B. .25-.75

133.Air contents should be _________ % by volume.
A.1-2
B.2-3
C.3-4
D.4-5
Answer» C. 3-4

134.Which one is not used as air entraining agents?
A.Alumina
B.Natural resins
C.Fats
D.Oil
Answer» A. Alumina

135.What is wet process?
A.Grinding and mixing of the raw materials in their dry state
B.Grinding and mixing of the raw materials in their medium state
C.Grinding and mixing of the raw materials in their wet state
D.Grinding and mixing of the raw materials in their overheated state
Answer» C. Grinding and mixing of the raw materials in their wet state

136.Excess in lime causes _______
A.The cement to shrink and integrate
B.The cement to shrink and disintegrate
C.The cement to expand and integrate
D.The cement to expand and disintegrate
Answer» D. The cement to expand and disintegrate

137.Silica in excess causes ________
A.The cement to set slowly
B.The cement to set quickly
C.The cement to expand
D.The cement to disintegrate
Answer» A. The cement to set slowly

138.Alumina in excess causes _________
A.Reduces the strength of the cement
B.Increases the strength of the cement
C.none
D.all
Answer» A. Reduces the strength of the cement

139.Which compound gives the colour to the cement?
A.Lime
B.Silica
C.Iron Oxide
D.Alumina
Answer» C. Iron Oxide

140.Which cement contains high percentage of C3S and less percentage of C2S?
A.Rapid Hardening Cement
B.Ordinary Portland Cement
C.Quick Setting Cement
D.Low Heat Cement
Answer» A. Rapid Hardening Cement

141.When concrete is to be laid under water ___________ is to used.
A.Rapid Hardening Cement
B.Ordinary Portland Cement
C.Quick Setting Cement
D.Low Heat Cement
Answer» C. Quick Setting Cement

142.Which of the following is correct for Low Heat Cement?
A.Suitable for use in cold weather areas
B.Heat of hydration is reduced by tri calcium aluminate content
C.This cement requires longer period of curing
D.This cement contains high aluminate %age usually between 35-55%.
Answer» B. Heat of hydration is reduced by tri calcium aluminate content

143.Which cement is used in sewage and water treatment plants?
A.Rapid Hardening Cement
B.Low Heat Cement
C.Sulphate Resisting Cement
D.Quick Setting Cement
Answer» C. Sulphate Resisting Cement

144.Which cement is used for mainly building construction where strength required with age?
A.Rapid Hardening Cement
B.Low Heat Cement
C.Portland Pozzolana Cement
D.Quick Setting Cement
Answer» C. Portland Pozzolana Cement

145.Which cement is used for artificial marble?
A.Rapid Hardening Cement
B.Sulphate Resisting Cement
C.Coloured Cement
D.Quick Setting Cement
Answer» C. Coloured Cement

146.Which cement is used to create bond with old concrete surface?
A.Rapid Hardening Cement
B.Expansive Cement
C.Sulphate Resisting Cement
D.Low Heat Cement
Answer» B. Expansive Cement

147.Which cement is used to store for longer duration in wet climatic conditions?
A.Expansive Cement
B.Ordinary Portland cement
C.Hydrophobic Cement
D.Quick Setting Cement
Answer» C. Hydrophobic Cement

148.Which cement is used for the construction of water-retaining structure like tanks, reservoirs, retaining walls, swimming pools, dams, bridges, piers etc?
A.Waterproof Portland cement
B.Colored Cement
C.High Alumina Cement
D.Low Heat Cement
Answer» A. Waterproof Portland cement

149.____ Cement is used for formwork that can be removed earlier and reused in other areas which save the cost of formwork.
A.Rapid Hardening Cement
B.Colored Cement
C.High Alumina Cement
D.Low Heat Cement
Answer» A. Rapid Hardening Cement

150.Which cement is mainly used for interior and exterior decorative works?
A.Rapid Hardening Cement
B.Colored Cement
C.High Alumina Cement
D.Low Heat Cement
Answer» B. Colored Cement

151.Which cement is used for works economic where considerations is predominant? Reservoirs, retaining walls, swimming pools, dams, bridges, piers etc.
A.Waterproof Portland Cement
B.Colored Cement
C.High Alumina Cement
D.Blast Furnace Slag Cement
Answer» D. Blast Furnace Slag Cement

152.How many times in each layer of concrete rodded in a slump cone?
A.75
B.25
C.12 to 15
D.35 to 65
Answer» B. 25

153.If L1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20oC and L2=Measurement taken after 3 hours of immersion in water at boiling temperature. Then what is soundness of cement?
A.L1+L2
B.L1/L2
C.L1-L2
D.L1*L2
Answer» C. L1-L2

154.Which of the following option is correct?
A.Standard consistency (%) = (wt of water added/ wt of cement) *100
B.Standard consistency (%) = (wt of water added- wt of cement) *100
C.Standard consistency = (wt of water added/ wt of cement) *100
D.Standard consistency (%) = (wt cement/ wt of water) *100
Answer» A. Standard consistency (%) = (wt of water added/ wt of cement) *100

155.According to geological origin, aggregates is/are classified into __________ types.
A.1
B.2
C.3
D.4
Answer» B. 2

156.Crushed stone, gravel and ordinary sand are examples of ___________
A.Lightweight aggregate
B.Normal-weight aggregate
C.Heavy-weight aggregate
D.Both Normal-weight aggregate and Heavy-weight aggregate
Answer» B. Normal-weight aggregate

157.Which type of aggregate is shown below?
A.Angular aggregate
B.Rounded aggregate
C.Flaky aggregate
D.Irregular or partially aggregate
Answer» C. Flaky aggregate

158.The rock which is not calcareous, is :
A.lime stone
B.Macl
C.Chalk
D.Laterite
Answer» D. Laterite

159.The main object of compaction of concrete, is:
A.to eliminate air holes
B.to achieve maximum density
C.to provide initimate contact between the concrete and embedded materials
D.all the above.
Answer» D. all the above.

160.Grading of aggregates should be continuous for
A.lean
B.rich
Answer» A. lean

161.The aggregates of
A.irregular
B.angular
C.rounded
D.flaky
Answer» B. angular

162.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» B. silica

163.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» C. saturated surface dry aggregate

164.The internal friction between the ingredients of concrete is minimised by
A.adopting coarse aggregates
B.using more water
C.reducing the surface area
D.all of these
Answer» D. all of these

165.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» B. using coke-breeze, cinder or slag as aggregate in the concrete

166.For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is
A.internal vibrator
B.screed vibrator
C.form vibrator
D.all of these
Answer» B. screed vibrator

167.The surface moisture of aggregates increases the water-cement ratio in the mix and thus
A.increases
B.decreases
Answer» B. decreases

168.For compacting large sections of mass concrete in structures, the type of vibrator used is
A.internal vibrator
B.screed vibrator
C.both (a) and (b)
D.either (a) or (b)
Answer» A. internal vibrator

169.The presence of
A.sodium carbonate and bicarbonate
B.calcium chloride
C.sodium chloride
D.sodium sulphate
Answer» A. sodium carbonate and bicarbonate

170.The tetra calcium alumino ferrite in cement has
A.good
B.poor
Answer» B. poor

171.For reinforced concrete, the aggregate used is
A.sand
B.gravel
C.crushed rock
D.all of these
Answer» D. all of these

172.The lime concrete has
A.less
B.more
C.same
Answer» A. less

173.The steel mould used for slump test is in the form of a
A.cube
B.cylinder
C.frustrum of a cone
D.none of these
Answer» C. frustrum of a cone

174.In order to avoid segregation, the concrete should not be thrown from a height.
A.Agree
B.Disagree
Answer» A. Agree

175.Water cement ratio may be defined as the ratio of
A.volume of water to that of cement in a concrete mix
B.weight of water to that of cement in a concrete mix
C.volume of water to that of concrete in a concrete mix
D.weight of water to that of concrete in a concrete mix
Answer» B. weight of water to that of cement in a concrete mix

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

177.For concreting of tunnel lining, the concrete is transported by
A.pumps
B.pans
C.wheel barrows
D.containers
Answer» A. pumps

178.For the improvement of workability of concrete, the shape of aggregate recommended is
A.irregular
B.angular
C.round
D.flaky
Answer» C. round

179.Which of the following statement is correct?
A.Larger the size of coarse aggregate, lesser is the quantity of fine aggregate and of cement required.
B.If very dry aggregates are used, the workability of the mix is likely to be reduced
C.Bulking is caused due to the formation of thin film of surface moisture around the sand particles.
D.all of the above
Answer» D. all of the above

180.For a structure subjected to the action of sea water, the cement used is
A.rapid hardening cement
B.low heat cement
C.high alumina cement
D.sulphate resisting cement
Answer» C. high alumina cement

181.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» D. 80 to 100 mm

182.The term ‘ware-hourse pack’ means
A.the total capacity of ware-house
B.packing of ware-house
C.pressure compaction of bags on lower layers
D.pressure exertion of bags on upper layers
Answer» C. pressure compaction of bags on lower layers

183.The length of Vicat plunger in Vicat’s apparatus varies from
A.20 to 30 mm
B.30 to 40 mm
C.40 to 50 mm
D.50 to 60 mm
Answer» C. 40 to 50 mm

184.The cement concrete prepared by mixing aluminium in it, is called
A.air-entrained concrete
B.cellular concrete
C.aerated concrete
D.any one of the above
Answer» D. any one of the above

185.Plain cement concrete is strong in taking
A.tensile stress
B.compressive stress
C.shear stress
D.all of these
Answer» B. compressive stress

186.As per IS : 459-1978, the concrete mixes are designated into
A.4 grades
B.5 grades
C.6 grades
D.7 grades
Answer» D. 7 grades

187.The factor which effect the quality of compaction, is
A.density of concrete
B.strength of concrete
C.durability of concrete
D.all of these
Answer» D. all of these

188.The top diameter, bottom diameter and height of the mould used for slump test are respectively
A.100 mm, 200 mm, 300 mm
B.200 mm, 100 mm, 300 mm
C.200 mm, 300 mm, 100 mm
D.100 mm, 300 mm, 200 mm
Answer» A. 100 mm, 200 mm, 300 mm

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

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

191.Weight batching is done by
A.spring dial scale
B.platform weighing machine
C.portable weigh batchers
D.all of these
Answer» D. all of these

192.The first compound which reacts with water when mixed with cement is tricalcium aluminate.
A.Correct
B.Incorrect
Answer» A. Correct

193.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» B. dry aggregate

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

195.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» D. all of these

196.The cement concrete in which high compressive stresses are artificially induced before its actual use, is called
A.plain cement concrete
B.reinforced cement concrete
C.prestressed cement concrete
D.lime concrete
Answer» C. prestressed cement concrete

197.The fineness modulus of an aggregate is roughly proportional to
A.specific gravity of the aggregate
B.shape of the aggregate
C.average size of particles in the aggregate
D.grading of the aggregate
Answer» C. average size of particles in the aggregate

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

199.Which of the following statement is wrong?
A.The concrete can not be pumped.
B.The concrete should have maximum creep.
C.The concrete structures can be put to use immediately ater their construction.
D.all of the above
Answer» D. all of the above

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

201.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» A. 27 mm

202.Which of the following statement is correct?
A.The maximum size of coarse aggregate should not exceed one-fourth of the minimum dimension of the plain concrete member.
B.the maximum size of coarse aggregate should not exceed one-fifth of the minimum dimension of the reinforced concrete member
C.The aggregates of 40 mm, 20 mm and 10 mm sizes are commonly used for concrete works.
D.all of the above
Answer» D. all of the above

203.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» A. 1 ; 1 : 2

204.The importance of batching is to obtain
A.strength
B.workability
C.durability
D.all of these
Answer» D. all of these

205.Harshness in concrete is due to the excess of
A.water
B.finer particles
C.middle sized particle
D.coarser particles
Answer» C. middle sized particle

206.Bulking of sand is
A.compacting of sand
B.segregating sand of particular size
C.increase in volume of sand due to presence of moisture upto certain extent
D.none of the above
Answer» C. increase in volume of sand due to presence of moisture upto certain extent

207.If the fineness modulus of sand is 3, then the sand is graded as
A.very fine sand
B.fine sand
C.medium sand
D.coarse sand
Answer» D. coarse sand

208.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» C. water-cement ratio

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

210.The maximum particle size of fine aggregate is
A.2.5 mm
B.4.75 mm
C.5.85 mm
D.6.5 mm
Answer» B. 4.75 mm

211.The size of an aggregate is determined by length gauge.
A.Yes
B.No
Answer» B. No

212.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» A. its least dimension is three-fifth of its mean dimension

213.In designing a ware-house, it is assumed that
A.each bag contains 50 kg of cement
B.floor area occupied by one bag of cement is 0.3 m2
C.height of each cement bag containing 35 litres of cement is 0.18 m
D.all of the above
Answer» D. all of the above

214.The concrete
A.should
B.should not
Answer» A. should

215.The strength of concrete using air entraining cement gets reduced by
A.5 to 10%
B.10 to 15%
C.15 to 20%
D.20 to 25%
Answer» B. 10 to 15%

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

217.In order to prepare a test specimen, it is necessary to
A.mix the cement and fine aggregate (sand) by dry hand
B.mix the coarse aggregate
C.mix water to the cment, fine aggregate and coarse aggregates
D.all of the above
Answer» D. all of the above

218.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» B. 30%

219.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» A. Portland cement (1 part), clean sand (1

220.The arbitrary mix method, the coarse aggregates are taken twice the fine aggregates.
A.True
B.False
Answer» A. True

221.At freezing point, the concrete sets easily.
A.Right
B.Wrong
Answer» B. Wrong

222.Too much finencess of cement
A.results cracks in concrete
B.generates greater heat
C.develops early strength
D.both (a) and (b)
Answer» D. both (a) and (b)

223.In making precast structural units for partition and wall lining purposes, the concrete should be
A.sawdust concrete
B.air-entrained concrete
C.light-weight concrete
D.vacuum concrete
Answer» C. light-weight concrete

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

225.Los Angeles machine is used to perform the abrasion resistance test of an aggregate.
A.Right
B.Wrong
Answer» A. Right

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

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

228.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» D. all of the above

229.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» A. True

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

231.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» C. continuous mixer

232.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» A. vacuum concrete

233.Which of the following statement is wrong?
A.If the height of pile exceeds 1.44 m, the cement bags should be arranged in header and stretcher fashion.
B.The cement bags should be rolled on the floor when it is taken out for use.
C.The strength of cement decreases with the passage of time.
D.none of the above
Answer» D. none of the above

234.In the slump test, the maximum size of the aggregate should not exceed 38 mm.
A.Correct
B.Incorrect
Answer» A. Correct

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

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

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

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

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

240.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» D. all the seven grades of concrete mix

241.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» D. all of the above

242.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» D. its length is equal to 1.8 times its mean dimension

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

244.The cement, widely used in retaining walls, is
A.rapid hardening cement
B.low heat cement
C.sulphate resisting cement
D.ordinary Portland cement
Answer» B. low heat cement

 (1)

245.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» A. hydrates the cement rapidly

246.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» D. all of these

247.Which of the following statement is correct?
A.The high early strength is obtained by adding tricalcium silicate in cement.
B.The dicalcium silicate provides good ultimate strength to cement.
C.The tetra calcium alumino ferrite has poor cementing value.
D.all of the above
Answer» D. all of the above

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

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

250.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» D. 50 m

251.The diameter of the pipe line used for transportation of concrete by pumps should not exceed
A.10 cm
B.20 cm
C.30 cm
D.40 cm
Answer» C. 30 cm

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

253.Which of the following cements is expected to have the highest compressive strength after 3 days.
A.ordinary Portland cement
B.rapid hardening cement
C.high alumina cement
D.sulphate resisting cement
Answer» C. high alumina cement

254.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» C. rotary kiln

255.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» D. all of these

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

257.The separation of water or water-cement mixture from the freshly mixed concrete is known as bleeding.
A.True
B.False
Answer» A. True

258.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» B. soundness

259.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» B. controlled concrete

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

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

262.The sum of percentages of all deleterious materials in the aggregate shall not exceed
A.5%
B.10%
C.15%
D.20%
Answer» A. 5%

263.In Vicat’s apparatus, the diameter of Vicat plunger is
A.5 mm
B.10 mm
C.15 mm
D.20 mm
Answer» B. 10 mm

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

265.Which of the following statement is correct?
A.Harshness in concrete mix increases if finer aggregates to fill the voids in coarse aggregates are less.
B.As the internal friction of aggregates increases, the workability of concrete decreases.
C.As the slump value increases, the workability of concrete also increases.
D.all of the above
Answer» D. all of the above

266.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» D. all of these

267.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» B. Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts)

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

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

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

271.The development of first 28 days strength is on account of the hydration of
A.dicalcium silicate
B.tricalcium silicate
C.tricalcium aluminate
D.tetra calcium alumino ferrite
Answer» B. tricalcium silicate

272.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» D. soundness

273.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» B. 15 mm

274.The slump whould not exceed 50 mm when compacting concrete with vibrators.
A.Agree
B.Disagree
Answer» A. Agree

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

276.Which of following proportion of different ingredient of concrete mix confirm to the arbitrary mothod of mixing?
A.1 ; 2 ; 5
B.1 ; 3 : 7
C.1 : 4 ; 8
D.1 : 5 ; 9
Answer» C. 1 : 4 ; 8

277.The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called
A.screeding
B.floating
C.trowelling
D.compacting
Answer» A. screeding

278.The apparent specific gravity of an aggregate is defined as
A.the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
B.the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
C.the weight of aggregate required to fill a container of unit volume
D.the difference in weight of the aggregate in saturated surface dry condition and in moist condition
Answer» A. the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles

279.In concrete walls, construction joints should be provided at the
A.floor level
B.soffit level of lintels
C.sill level of windows
D.all of these
Answer» D. all of these

280.According to IS : 383 – 1970, a good a aggregate for concrete construction should be
A.chemically inert
B.sufficiently strong
C.sufficiently hard and durable
D.all of these
Answer» D. all of these

281.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» D. 2700

282.A good concrete should be subjected to
A.maximum
B.minimum
Answer» B. minimum

283.The hardening is the phenomenon by virtue of which
A.the cement does not undergo large change in volume when treted with water
B.the plastic cement paste changes into hard mass
C.the cement paste sets and develops strength
D.none of the above
Answer» C. the cement paste sets and develops strength

284.Under normal circumstances, the beam soffits may be removed after
A.2 days
B.7 days
C.14 days
D.21 days
Answer» B. 7 days

285.The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M 20 is
A.1 ; 1 : 2
B.1 ; 1.5 : 3
C.1 ; 2 : 4
D.1 ; 3 : 6
Answer» B. 1 ; 1.5 : 3

286.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» C. 25 N/mm2

287.The measuring 50 litres of aggregate, the inner dimensions of a farma should be
A.25 cm x 25 cm x 40 cm
B.29 cm x 29 cm x 48 cm
C.30 cm x 30 cm x 50 cm
D.31 cm x 31 cm x 52 cm
Answer» D. 31 cm x 31 cm x 52 cm

288.The test conducted in the laboratory on the specimen made out of trial concrete mix is called
A.preliminary test
B.slump test
C.works test
D.none of these
Answer» A. preliminary test

289.The capcity of a ware-house depends upon the
A.floor area occupied by one cement bag
B.height to which the cement bags are piled
C.either (a) or (b)
D.both (a) and (b)
Answer» D. both (a) and (b)

290.For high degree of workability, the compaction factor is
A.0.65
B.0.75
C.0.85
D.0.95
Answer» D. 0.95

291.The ratio of the volume of moist sand to the volume of dry sand is known as
A.crushing value
B.impact value
C.bulking factor
D.none of these
Answer» C. bulking factor

292.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» D. all of these

293.The process of hardening the concrete mixes by keeping its surface moist for a certain period is called
A.floating
B.curing
C.screeding
D.none of these
Answer» B. curing

294.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» D. all of the above

295.According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of
A.1 ; 1
B.1 ; 2
C.1 ; 3
D.1 ; 4
Answer» C. 1 ; 3

296.Which of the following statement is correct?
A.Sulphate resisting cement is particularly used for canal lining.
B.Low heat cement should not be used for thin concrete structures.
C.Rapid hardening cement should not be used for massive concrete structures
D.all of the above
Answer» D. all of the above

297.Lime when added in excess quantity
A.makes the cement unsound
B.cuses the cement to expand and disintegrate
C.lowers the clinkering temperature of cement
D.both (a) and (b)
Answer» D. both (a) and (b)

298.The standard sand now used in India is obtained from
A.Ennore (Chennai)
B.Mumbai
C.Orissa
D.Jaipur
Answer» A. Ennore (Chennai)

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

300.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» C. 1.5 N / mm2

301.The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from
A.50 to 60%
B.60 to 70%
C.70 to 80%
D.80 to 90%
Answer» C. 70 to 80%

302.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» B. 25 to 35%

303.Vertical sides of columns may be stripped after
A.1 to 2 days
B.7 days
C.14 days
D.21 days
Answer» A. 1 to 2 days

304.Rapid hardening cement is used
A.where high early strength is desired
B.where form work is to be removed as early as possible
C.for constructing road pavements
D.all of the above
Answer» D. all of the above

305.If 30% excess water is added, the strength of concrete is reduced by
A.30%
B.40%
C.50%
D.60%
Answer» C. 50%

306.Which of the following statement is correct while compacting concrete with vibrators?
A.The vibrator should be inserted horizontally.
B.The vibrator should not be immersed through a full depth of freshly laid concrete.
C.The vibrator should not touch the form surface.
D.all of the above
Answer» C. The vibrator should not touch the form surface.

307.The slump test of concrete is used to mesure its
A.consistency
B.mobility
C.homogeneity
D.all of these
Answer» A. consistency

308.The importance of storing the various ingredients of concrete is
A.to maintain the uniformity of grading
B.to maintain the uniformity of moisture
C.to maintain the strength of materials
D.both (a) and (b)
Answer» D. both (a) and (b)

309.The resistance of an aggregate to wear is known as
A.shear value
B.crushing value
C.abrasion value
D.impact value
Answer» C. abrasion value

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

311.The minimum quantity of cement to be used in controlled concrete is specified as
A.120 kg / cm3
B.160 kg / cm3
C.220 kg / cm3
D.280 kg / cm3
Answer» C. 220 kg / cm3

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

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

314.The value of finencess modulus for fine sand may range between
A.1.1 to 1.3
B.1.3 to 1.6
C.1.6 to 2.2
D.2.2 to 2.6
Answer» D. 2.2 to 2.6

315.The final operation of finishing the concrete surface is called
A.screeding
B.floating
C.trowelling
D.none of these
Answer» C. trowelling

316.Segregation of concrete increases the strength of concrete.
A.Yes
B.No
Answer» B. No

317.The resistance of an aggregate to compressive forces is known as
A.crushing value
B.impact value
C.abrasion value
D.none of these
Answer» A. crushing value

318.According to the rule of water cement ratio, the strength of concrete wholly depends upon
A.the quality of cement
B.the quality of cement mixed with aggregate
C.the amount of water used in preparation of concrete mix
D.all of the above
Answer» C. the amount of water used in preparation of concrete mix

319.The process of proper and accurate measurement of all concrete materials for uniformity of proportions and aggregate grading is called
A.proportioning
B.grading
C.mixing
D.batching
Answer» D. batching

320.The minimum particle size of coarse aggregate is
A.2.5 mm
B.4.75 mm
C.5.85 mm
D.6.5 mm
Answer» B. 4.75 mm

321.The concrete without any reinforcement has
A.low
B.high
Answer» A. low

322.A mix with water-cement ratio of 0.78 is termed as wet mix.
A.Yes
B.No
Answer» A. Yes

323.Cement concrete is
A.permeable
B.impermeable
Answer» B. impermeable

324.Vicat’s apparatus is used to perform
A.fineness test
B.soundness test
C.consistency test
D.compressive strength test
Answer» C. consistency test

325.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» B. provides strength to the cement

326.The construction joints in cement concrete
A.should be located where bending moment is large
B.should be located where shear force is large
C.should not be provided at the corners
D.should be spaced at a distance of 3 m apart in case of huge structures
Answer» C. should not be provided at the corners

327.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» D. all of the above

328.A good concrete should have minimum thermal expansion.
A.Yes
B.No
Answer» A. Yes

329.Workability of concrete mix having very low water-cement ratio should be obtained by
A.flexural strength test
B.slump test
C.compaction factor test
D.any one of these
Answer» C. compaction factor test

330.The process of removing the irregularities from the surface of concrete left after screeding is called floating.
A.Correct
B.Incorrect
Answer» A. Correct

331.Each layer of concrete placed in the mould, in preliminary test, is compacted 25 times with a 20 mm diameter rod and 60 cm in length
A.Right
B.Wrong
Answer» B. Wrong

332.“Colocrete” is the commercial term for
A.high alumina cement
B.coloured cement
C.low heat cement
D.rapid hardening cement
Answer» B. coloured cement

333.In transportation of concrete by pumps
A.the slump should not be less than 50 mm and more than 80 mm
B.the water cement ratio should remain between 0.5 to 0.65
C.the number of bends in a pipe line should be as small as possible
D.all of the above
Answer» D. all of the above

334.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» D. all of the above

335.The workability of concrete can be improved by adding
A.hydrated lime
B.flyash
C.calcium chloride
D.all of these
Answer» D. all of these

336.In order to provide colour, hardness and strength to the cement, the ingredient used is
A.lime
B.silica
C.alumina
D.iron oxide
Answer» D. iron oxide

337.In performing the works test
A.the mould for test specimen should be made of non-absorbent material
B.the mould should be constructed in such a way that there is leakage of water from test specimen during moulding
C.the base plate of the mould should be of non-absorbent material
D.all of the above
Answer» D. all of the above

338.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» A. 63 : 22 : 6 : 3

339.The process of consolidating concrete mix after placing it in position is termed as
A.curing
B.wetting
C.compaction
D.none of these
Answer» C. compaction

340.The main object of proportioning concrete is to obtain
A.required strength and workability
B.desired durability
C.water tightness
D.all of these
Answer» D. all of these

341.If the water cement ratio is more, then the
A.strength of concrete will be less
B.durability of concrete will be less
C.capillary voids will be more in the physical structure of hydrated cement
D.all of the above
Answer» D. all of the above

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

343.Blast furnace slag cement
A.develops low heat of hydration
B.has less early strength
C.develops high heat of hydration
D.has high early strength
E.Both (a) and (b)
Answer» E. Both (a) and (b)

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

345.The compaction factor is the ratio of weight of partially compacted concrete to the weight of fully compacted concrete.
A.Yes
B.No
Answer» A. Yes

346.Argillaceous materials contain
A.calcium
B.lime
C.alumina
Answer» C. alumina

347.If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1 : 2 : 4, then the grade of concrete is
A.M 10
B.M 15
C.M 20
D.M 25
Answer» B. M 15

348.The rule of water cement ratio was established by
A.Duff Abram
B.Plowman
C.W. Simms
D.Dr. Karl Terzaghi
Answer» A. Duff Abram

349.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» A. Yes

350.The workability of concrete is expressed by
A.water-cement ratio
B.slump value
C.compaction factor
D.both (a) and (b)
Answer» D. both (a) and (b)

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

352.High temperature
A.increases
B.decreases
Answer» B. decreases

353.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» D. all of these

354.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» A. whose all the pores are filled with water and also having its surface wet

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

356.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» C. either (a) or (b)

357.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» D. all of these

358.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» D. all of these

359.High percentage of tricalcium silicate and low percentage of dicalcium silicate in cement results in
A.rapid hardening
B.high erly strength
C.high heat generation
D.none of these
Answer» D. none of these

360.When vibrators are used for compaction, the consistency of concrete depends upon the
A.type of mix
B.placing conditions
C.efficiency of vibrator
D.all of these
Answer» D. all of these

361.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» C. tensile, compressive and shear stresses

362.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» A. 30 minutes

363.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» A. silt

364.The strength of cement concrete increases with the increase of water cement ratio.
A.Agree
B.Disagree
Answer» A. Agree

 (1)

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

366.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
E.Both (a) and (b)
Answer» E. Both (a) and (b)

367.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» A. Right

368.The compressive strength of an ordinary Portland cement (1 : 3 cement mortar cube) after 7 days test should not be less than
A.11 N/mm2
B.17.5 N/mm2
C.22 N/mm2
D.27.5 N/mm2
Answer» B. 17.5 N/mm2

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

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

371.The aggregates of
A.irregular
B.angular
C.rounded
D.flaky
Answer» C. rounded

372.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» A. 1.25

373.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» B. 50 kg of cement : 70 litres of fine aggregate : 140 litres of coarse aggregate

374.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» D. both (b) and (c)

375.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» D. all of these

376.Which of the following statement is wrong?
A.The coarse sand produces a harsh and unworkable mix.
B.An admixture cannot increase the workability of concrete without increasing water content.
C.Salts of manganese cause a considerable reduction in the strength of concrete.
D.all of the above
Answer» B. An admixture cannot increase the workability of concrete without increasing water content.

377.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» B. makes the concrete mix unworkable

378.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» D. 1500?C to 1600?C

379.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» D. all of the above

380.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» A. litres of water required per bag of cement

381.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» D. 50%

382.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» C. transport of concrete by belt concrete conveyors

383.Which of the following statement is correct?
A.Duff Abram’s law is valid only when the concrete is of workable plasticity.
B.If the water-cement ratio is less, the strength of concrete will be less.
C.The strength of concrete decreases with age.
D.A rich mix of concrete provides low strength than a lean mix.
Answer» A. Duff Abram’s law is valid only when the concrete is of workable plasticity.

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

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

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

387.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» C. fine aggregate

388.Efflorescence in cement is caused due to the excess of
A.silica
B.lime
C.alkalies
D.iron oxide
Answer» C. alkalies

389.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» D. M 55

390.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» D. all of the above

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

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

393.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» D. all of the above

394.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» D. ordinary concrete

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

396.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» A. ease with which it can be mixed, transported and placed in position in a homogeneous state

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

398.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» A. 15 to 20%

399.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» D. all of the above

400.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» D. 1 ; 3 : 6

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

402.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» C. medium

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

404.The gypsum is added to the cement for
A.providing high strength to the cement
B.controlling the initial setting time of cement
C.lowering the clinkering temperature of cement
D.all of the above
Answer» B. controlling the initial setting time of cement

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

406.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» D. all of the above

407.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» A. Correct

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

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

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

411.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» D. all of these

412.The maximum quantity of aggregate per 50 kg of cement should not exceed
A.100 kg
B.200 kg
C.350 kg
D.450 kg
Answer» D. 450 kg

413.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» A. accelerates setting of cement

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

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

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

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

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

419.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» D. 5 to 6

420.Fine sand bulks
A.less
B.more
Answer» B. more

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

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

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

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

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

426.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» D. all of these

427.Bulk specific gravity of an aggregate is defined as
A.the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles
B.the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
C.the weight of aggregate required to fill a container of unit volume
D.the difference in weight of the aggregate in saturated surface dry condition and in moist condition
Answer» B. the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles

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

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

430.In preliminary test, the concrete is placed in the mould in
A.two
B.three
C.four
D.five
Answer» B. three

431.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» C. 0.85 P

432.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» D. causes bleeding in concrete

433.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» B. 0.075 mm

434.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» B. 1 m

435.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» D. all of these

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

437.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» C. 12 kg

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

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