28/07/2017
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51 During the process of hardening of
cement, _______ will takes place
[ A ] Bleeding
[ B ] Segregation
[ C ] Hydration
[ D ] All the above
Answer : C
52 Due to Bleeding action concrete
becomes
[ A ] Weak
[ B ] Strong
[ C ] Hard
[ D ] Durable
Answer : A
53 About 70% to 80% of cement is
contributed by
[ A ] Tricalcium silicate and Tricalcium
aluminate
[ B ] Tricalcium silicate and Dicalcium
silicate
[ C ] Tricalcium Aluminate and Dicalcium
silicate
[ D ] Tricalcium Aluminate and Tetra calcium
Aluminoferrite
Answer : B
54 When compared to ordinary Portland
cement, Rapid hardening Portland cement
contains
______________ amount of lime content
[ A ] Equal
[ B ] Greater
[ C ] Lesser
[ D ] Zero
Answer : B
55 The following compound has the
property of early strength as well as ultimate
strength
[ A ] C3S
[ B ] C2S
[ C ] C3A
[ D ] C4AF
Answer : A
56 Which of the following compounds is
considered to be an undesirable compound
for cement
[ A ] C3S
[ B ] C2S
[ C ] C3A
[ D ] C4AF
Answer : D
57 Which of the following compound is
susceptible to be attached by alkalies and
salts
[ A ] C3S
[ B ] C3S
[ C ] C3A
[ D ] C3AF
Answer : C
58 The heat generated in ordinary cement
at the end of 3 days is about
[ A ] 60 cal/g
[ B ] 80 cal/g
[ C ] 100 cal/g
[ D ] 120 cal/g
Answer : B
59 Low heat cement contains more
amount of __________ than that of ordinary
Portland
cement
[ A ] C3S
[ B ] C2S
[ C ] C3A
[ D ] None of the above
Answer : B
60 In Portland Blast furnace slag cement,
the blast furnace slag content shall not
exceed
[ A ] 50%
[ B ] 65%
[ C ] 80%
[ D ] 90%
Answer : B
61 White cement contains less amount of
___________
[ A ] Lime
[ B ] Silica
[ C ] Alumina
[ D ] Iron oxide
Answer : D
62 In fineness test on cement, residue left
on I.S. sieve no.9 shall not exceed __________
by
weight of the sample of cement
[ A ] 5%
[ B ] 10%
[ C ] 15%
[ D ] 20%
Answer : B
63 Ordinary Portland cement requires a
specific surface of
[ A ] 1250 cm2/gm
[ B ] 2250 cm 2/gm
[ C ] 3250 cm 2/gm
[ D ] 3500 cm 2/gm
Answer : B
64 The maximum percentage of chemical
ingredient of cement is
[ A ] Iron oxide
[ B ] Silica
[ C ] Lime
[ D ] Magnesium oxide
Answer : C
65 The minimum percentage of chemical
ingredient of cement is
[ A ] Iron oxide
[ B ] Silica
[ C ] Lime
[ D ] Magnesium oxide
Answer : D
66 Efflorescence in cement is caused due
to an excess of
[ A ] Alkalies
[ B ] Silica
[ C ] Iron oxide
[ D ] Alumina
Answer : A
67 Dicalcium silicate (C2S)
[ A ] rates rapidly
[ B ] Hardens rapidly
[ C ] Generates less heat of hydration
[ D ] Has less resistance to sulphate attack
Answer : C
68 Tricalcium aluminate (C3A)
[ A ] Hydrating less rapidly
[ B ] Is a redundant compound
[ C ] To be attacked by alkalies and salts
[ D ] None of these
Answer : C
69 For road pavements, the cement
generally used, is
[ A ] Ordinary Portland cement
[ B ] Rapid hardening cement
[ C ] Low heat cement
[ D ] Blast furnace slag cement
Answer : A
70 For mass concrete work, the type of
cement preferable is
[ A ] Ordinary Portland cement
[ B ] Rapid hardening cement
[ C ] Low heat cement
[ D ] Blast furnace slag cement
Answer : C
71 Le-chatelier apparatus is used for
[ A ] Fineness test
[ B ] Consistency test
[ C ] Soundness test
[ D ] Compressive strength test
Answer : C
72 The diameter of the Vicat plunger is 10
mm and its length varies form
[ A ] 40 mm
[ B ] 50 mm
[ C ] 55 mm
[ D ] 60 mm
Answer : B
73 Inert material of a cement concrete
mix, is
[ A ] Water
[ B ] Aggregate
[ C ] Cement
[ D ] None of these
Answer : B
74 An aggregate is said to be flaky, if its
least dimension is less than
[ A ] 2/3 mean dimension
[ B ] 3/4 mean dimension
[ C ] 3/5 mean dimension
[ D ] 5/8 mean dimension
Answer : C
75 Workability of concrete for a given
water content is good, if the aggregates are
[ A ] Rounded
[ B ] Irregular
[ C ] Angular
[ D ] Flaky
Answer : A
76 Setting time of cement increases by
adding
(i)gypsum
(ii)sodium oxide
(iii)calcium chloride
[ A ] i
[ B ] i and ii
[ C ] i and iii
[ D ] i, ii and iii
Answer : A
77 The cement becomes useless if its
absorbed moisture content exceeds
[ A ] 1%
[ B ] 2%
[ C ] 3%
[ D ] 5%
Answer : D
78 The size of fine aggregates does not
exceed
[ A ] 2.75 mm
[ B ] 3.75 mm
[ C ] 4.75 mm
[ D ] 5.75 mm
Answer : C
79 Water used for mixing concrete should
be
[ A ] Slightly acidic
[ B ] Free from bacteria
[ C ] Distilled
[ D ] Potable
Answer : D
80 The workability of concrete is mostly
influenced by its
[ A ] Water cement ratio
[ B ] Aggregate cement ratio
[ C ] Cement content
[ D ] Water content
Answer : A
81 Chief constituent of ordinary Portland
cement is
[ A ] Lime
[ B ] Alumina
[ C ] Magnesia
[ D ] Iron oxide
Answer : A
82 The heat of hydration for low heat
cement at the age of 7 days shall not
exceed
[ A ] 80 cal / gm
[ B ] 75 cal / gm
[ C ] 70 cal / gm
[ D ] 65 cal / gm
Answer : D
83 Cement is obtained by burning a
mixture of the following materials
[ A ] Siliceous materials
[ B ] Argillaceous materials
[ C ] Calcareous materials
[ D ] All the above
Answer : D
84 For determining the compressive
strength test on cement is, the percentage
amount of
water to be added as (Pa = Percentage of
water for required consistency)
[ A ] 0.25 Pa + 2.5
[ B ] 0.25 Pa + 3.5
[ C ] 0.35 Pa + 2.5
[ D ] 0.35 Pa + 3.5
Answer : B
85 Minimum compressive strength of
cement required at the age of 3 days for
ordinary
Portland cement of grade 33 is
[ A ] 1.15 N/mm2
[ B ] 11.5 N/mm2
[ C ] 2.10 N/mm2
[ D ] 21 N/mm2
Answer : B
86 Bulking of sand takes place due
to
[ A ] Surface tension
[ B ] Viscosity
[ C ] Capillarity
[ D ] None of the above
Answer : A
87 Creep coefficient is the ratio of
[ A ] Ultimate Creep strain to elastic strain
[ B ] Elastic strain to ultimate Creep strain
[ C ] Elastic strain to plastic strain
[ D ] Plastic strain to elastic strain
Answer : A
88 Generally the strength of concrete is
represented by the crushing stress of
concrete cube of
size
[ A ] 50 mm
[ B ] 100 mm
[ C ] 150 mm
[ D ] 250 mm
Answer : C
89 As per IS:1139, the characteristic yield
strength for hot rolled High yield strength
deformed
bars is
[ A ] 250 N/mm2
[ B ] 415 N/mm2
[ C ] 500 N/mm2
[ D ] 550 N/mm2
Answer : B
90 As per IS:1139, the characteristic yield
strength for cold twisted deformed bars is
[ A ] 250 N/mm2
[ B ] 415 N/mm2
[ C ] 500 N/mm2
[ D ] 550 N/mm2
Answer : C
91 For reinforced concrete work,
aggregates having a nominal size of ——– are
generally used
[ A ] 20 mm
[ B ] 40 mm
[ C ] 50 mm
[ D ] 60 mm
Answer : A
92 The proportion of coarse aggregates to
fire aggregates in structural concrete is
usually
[ A ] 0.50 – 1.25
[ B ] 1.25 – 4.50
[ C ] 1.50 – 2.50
[ D ] 0.25 – 0.75
Answer : C
93 Fly ash when added to concrete
[ A ] Acts as aggregates
[ B ] Acts as pozzolona
[ C ] Improves appearance
[ D ] Reduces setting time
Answer : B
94 As per IS:456, the strength of
concrete sample is less than
[ A ] The characteristic strength minus
1.35times the standard deviation
[ B ] 0.80 times the characteristic strength
[ C ] Greater of (a) and (b)
[ D ] None of the above
Answer : C
95 Characteristic strength of steel has
been defined as
[ A ] 0.1 % proof stress
[ B ] 0.2 % proof stress
[ C ] 0.4 % proof stress
[ D ] Equal to proof stress
Answer : B
96 For Ordinary Portland cement concrete
exposed to dry and hot weather conditions,
good
moist curing period is
[ A ] 7 days
[ B ] 10 days
[ C ] 14 days
[ D ] None of the above
Answer : B
97 As per IS: 456-2000, recommended
value for standard deviation for concrete mix
from M30
to M50 is
[ A ] 1 N/mm2
[ B ] 2 N/mm2
[ C ] 4 N/mm2
[ D ] 5 N/mm2
Answer : D
98 As per 1S: 456-2000, minimum grade
of concrete in seat water constructions is
[ A ] M20
[ B ] M25
[ C ] M30
[ D ] M50
Answer : C
99 The section of a reinforced beam
where most distant concrete fiber in
compression and
tension in steel attains permissible stresses
simultaneously is called
(i)Balanced section
(ii)Economic section
(iii)Critical section
[ A ] i
[ B ] i and ii
[ C ] i and iii
[ D ] i, ii and iii
Answer : D
100 As the percentage of steel
increases
[ A ] Depth of neutral axis decreases
[ B ] Depth of neutral axis increases
[ C ] Lever arm increases
[ D ] None of the above are correct
Answer : B
