Concrete Technology objective question and answer part 3
Question No. 209
M10 grade of concrete approximates
(A) 1 : 3 : 6 mix
(B) 1 : 1 : 2 mix
(C) 1 : 2 : 4 mix
(D) 1 : 1.5 : 3 mix
Answer: Option A
Question No. 210
Higher workability of concrete is required if the structure is
(A) Made with cement concrete
(B) Thick and reinforced
(C) Thin and heavily reinforced
(D) Thick and heavily reinforced
Answer: Option D
Question No. 211
For a cantilever of effective depth of 0.5 m, the maximum span to satisfy vertical deflection limit is
(A) 3.5 m
(B) 4 m
(C) 4.5 m
(D) 5 m
Answer: Option A
Question No. 212
The bulk density of aggregates does not depend upon:
(A) Size and shape of aggregates
(B) Specific gravity of aggregates
(C) Grading of aggregates
(D) Size and shape of the container
Answer: Option D
Question No. 213
How long will it take for the concrete to achieve 100% of its strength?
(A) 7 days
(B) 14 days
(C) 21 days
(D) 28 days
Answer: Option D
Question No. 214
A higher modular ratio shows
(A) Higher compressive strength of concrete
(B) Lower compressive strength of concrete
(C) Higher tensile strength of steel
(D) Lower tensile strength of steel
Answer: Option B
Question No. 215
For the construction of cement concrete floor, the maximum permissible size of aggregate, is
(A) 4 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm
Answer: Option D
Question No. 216
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: Option D
Question No. 217
The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on
(A) Top face perpendicular to wall
(B) Bottom face perpendicular to wall
(C) Both top and bottom faces perpendicular to wall
(D) None of the above
Answer: Option A
Question No. 218
Separation of coarse aggregates from mortar during transportation, is known
(A) Bleeding
(B) Creeping
(C) Segregation
(D) Shrinkage
Answer: Option C
Question No. 219
A flaky aggregate is said to be elongated if its length is
(A) Equal to the mean size
(B) Twice the mean size
(C) Thrice the mean size
(D) Four times the mean size
Answer: Option B
Question No. 220
Assertion A : The load factor for live load is greater than that for dead load.
Reason R : The live loads are more uncertain than dead loads.
Select your answer based on the coding system given below:
(A) Both A and R is true and R is the correct explanation of A
(B) Both A and R is true but R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true
Answer: Option A
Question No. 221
You are asked to construct a massive dam, the type of cement you will use, is
(A) Ordinary Portland cement
(B) Rapid hardening cement
(C) Low heat cement
(D) Blast furnace slag cement
Answer: Option C
Question No. 222
An ideal ware house, is provided
(A) Water proof masonry walls
(B) Water proof roof
(C) Few windows which remain generally closed
(D) All the above
Answer: Option D
Question No. 223
Normally pre-stressing wires are arranged in the
(A) Upper part of the beam
(B) Lower part of the beam
(C) Center
(D) Anywhere
Answer: Option B
Question No. 224
Pick up the correct statement from the following:
(A) Bulking of sand is caused due to formation of a thin film of surface moisture
(B) Fine sand bulks more than coarse sand
(C) The volume of fully saturated sand, is equal to the volume of dry and loose sand
(D) All the above
Answer: Option D
Question No. 225
The minimum percentage of chemical ingredient of cement is that of
(A) Magnesium oxide
(B) Iron oxide
(C) Alumina
(D) Lime
Answer: Option A
Question No. 226
Poisson's ratio for concrete
(A) Remains constant
(B) Increases with richer mixes
(C) Decreases with richer mixes
(D) None of the above
Answer: Option B
Question No. 227
Shrinkage in concrete can be reduced by using
(A) Low water cement ratio
(B) Less cement in the concrete
(C) Proper concrete mix
(D) All the above
Answer: Option D
Question No. 228
The shuttering of a hall measuring 4 m × 5 m, can be removed after
(A) 5 days
(B) 7 days
(C) 10 days
(D) 14 days
Answer: Option B
Question No. 229
The approximate value of the ratio between direct tensile strength and flexural strength is
(A) 0.33
(B) 0.5
(C) 0.75
(D) 1.0
Answer: Option B
Question No. 230
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: Option C
Question No. 231
Workability improved by adding
(A) Fly ash
(B) Hydrated lime
(C) Calcium chloride
(D) All the above
Answer: Option D
Question No. 232
Workability of concrete is inversely proportional to
(A) Time of transit
(B) water-cement ratio
(C) The air in the mix
(D) Size of aggregate
Answer: Option A
Question No. 233
Pick up the correct statement from the following:
(A) The free water is the amount of water added while mixing and the amount of water held on
the surface of the aggregates prior to mixing
(B) The total water is the free water and the amount actually absorbed by the aggregates
(C) Neither (a) nor (b)
(D) Both (a) and (b)
Answer: Option D
Question No. 234
Inert material of a cement concrete mix, is
(A) Water
(B) Cement
(C) Aggregate
(D) None of these
Answer: Option C
Question No. 235
If a beam fails in bond, then its bond strength can be increased most economically by
(A) Increasing the depth of beam
(B) Using thinner bars but more in number
(C) Using thicker bars but less in number
(D) Providing vertical stirrups
Answer: Option B
Question No. 236
Pick up the incorrect statement from the following:
(A) A rich mix of concrete possesses higher strength than that a lean mix of desired workability
with excessive quantity of water
(B) The strength of concrete decreases as the water cement ratio increases
(C) Good compaction by mechanical vibrations, increases the strength of concrete
(D) None of these
Answer: Option A
Question No. 237
Ordinary Portland cement is manufactured from
(A) Lime stone and clay
(B) Gypsum and lime
(C) Pozzolana
(D) Lime, pozzolana and clay
Answer: Option B
Question No. 238
The percentage of reinforcement in case of slabs, when high strength deformed bars are used is
not less than
(A) 0.15
(B) 0.12
(C) 0.30
(D) 1.00
Answer: Option B
Question No. 239
Addition of pozzolana to cement
(A) Decreases workability
(B) Increases strength
(C) Increases heat of hydration
(D) None of these
Answer: Option D
Question No. 240
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: Option C
Question No. 241
The minimum cover to the ties or spirals should not be less than
(A) 15 mm
(B) 20 mm
(C) 25 mm
(D) 50 mm
Answer: Option C
Question No. 242
According to Water-Cement Ratio Law, the strength of workable plastic concrete
(A) Depends upon the amount of water used in the mix
(B) Does not depend upon the quality of cement mixed with aggregates
(C) Does not depend upon the quantity of cement mixed with aggregates
(D) All the above
Answer: Option D
Question No. 243
Sands of zone I are:
(A) Course
(B) Medium
(C) Medium to fine
(D) Fine
Answer: Option A
Question No. 244
According to Whitney's theory, ultimate strain of concrete is assumed to be
(A) 0.03 %
(B) 0.1 %
(C) 0.3 %
(D) 3 %
Answer: Option C
Question No. 245
The condition not applicable to water cement ratio law, is
(A) Internal moisture conditions on hydration continue till complete strength is gained
(B) Concrete specimens may be tested at any temperature
(C) Concrete specimens need be of same age
(D) Concrete specimens need be of same size
Answer: Option B
Question No. 246
If the slump of a concrete mix is 60 mm, its workability is
(A) Very low
(B) Low
(C) Medium
(D) High
Answer: Option C
Question No. 247
Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work
respectively should not be less than
(A) 35 MPa and 42 MPa
(B) 42 MPa and 35 MPa
(C) 42 MPa and 53 MPa
(D) 53 MPa and 42 MPa
Answer: Option B
Question No. 248
The void ratio of
(A) Single size coarse aggregate is roughly 0.45
(B) Graded coarse aggregate is roughly 0.040
(C) Fine aggregate is roughly 0.45
(D) All the above
Answer: Option D
Question No. 249
According to IS : 382-1963, a good aggregate should be
(A) Chemically inert
(B) Sufficiently strong
(C) Hard and durable
(D) All the above
Answer: Option D
Question No. 250
The compressive strength of 100 mm cube as compared to 150 mm cube is always
(A) Less
(B) More
(C) Equal
(D) None of the above
Answer: Option B
Question No. 251
The diameter of the Vicat plunger is 10 mm and its length varies from
(A) 20 mm to 30 mm
(B) 30 mm to 40 mm
(C) 40 mm to 50 mm
(D) 50 mm to 60 mm
Answer: Option C
Question No. 252
Gypsum is added for
(A) Colour
(B) Strength
(C) Controlling setting time
(D) None of these
Answer: Option C
Question No. 253
Modulus of elasticity of steel as per IS: 4561978 shall be taken as
(A) 20 kN/cm²
(B) 200 kN/cm²
(C) 200 kN/mm²
(D) 2 × 106 N/cm²
Answer: Option C
Question No. 254
The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 250 kg/cm2
Answer: Option B
Question No. 255
The cement becomes useless if its absorbed moisture content exceeds
(A) 1 %
(B) 2 %
(C) 3 %
(D) 5 %
Answer: Option D
Question No. 256
In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
(A) 100 mm
(B) 150 mm
(C) 200 mm
(D) 250 mm
Answer: Option B
Question No. 257
For preparing a test-specimen, it is necessary
(A) To mix cement and fine aggregate by dry hand
(B) To mix coarse aggregates
(C) To mix water to the cement, fine aggregates and coarse aggregates
(D) All the above
Answer: Option D
Question No. 258
For a good concrete
(A) Aggregates should be hard and durable
(B) Water should be free from organic materials
(C) Cement should be sufficient to produce the required strength
(D) All the above
Answer: Option D
Question No. 259
The design yield stress of steel according to IS: 4561978 is:
(A) 0.37 fy
(B) 0.57 fy
(C) 0.67 fy
(D) 0.87 fy
Where fy is the characteristic yield strength of steel
Answer: Option D
Question No. 260
The process of hardening the concrete by keeping its surface moist is known
(A) Placing
(B) Wetting
(C) Curing
(D) Compacting
Answer: Option C
Question No. 261
For the construction of the retaining structures, the type of concrete mix to be used, is
(A) 1 : 3 : 6
(B) 1 : 2 : 4
(C) 1 : 1½ : 3
(D) 1 : 4 : 8
Answer: Option C
Question No. 262
The main reinforcement in the toe of a T-shaped R C. retaining wall is provided on
(i) Top face parallel to the wall
(ii) Top face perpendicular to the wall
(iii) Bottom face parallel to the wall
(iv) Bottom face perpendicular to the wall
The correct answer is
(A) Only (ii) is correct
(B) (i) and (ii) are correct
(C) (iii) and (iv) are correct
(D) Only (iv) is correct
Answer: Option D
Question No. 263
The produce impermeable concrete
(A) Thorough mixing of concrete is required
(B) Proper compaction of concrete is required
(C) Proper curing of concrete is required
(D) All the above
Answer: Option D
Question No. 264
Pozzolanic properties exist in
(A) Shales
(B) Fly ash
(C) Pumicite
(D) All the above
Answer: Option D
Question No. 265
A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth
(1/D) is less than
(A) 1.5
(B) 2.0
(C) 2.5
(D) 3.0
Answer: Option C
Question No. 266
Pick up the correct statement from the following:
(A) The weight of ingredients of concrete mix, is taken in kilograms
(B) Water and aggregates are measured in litres
(C) 20 bags of cement make one tonne
(D) All the above
Answer: Option D
Question No. 267
If fineness modulus of sand is 2.5, it is graded as
(A) Very fine sand
(B) Fine sand
(C) Medium sand
(D) Coarse sand
Answer: Option B
Question No. 268
Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
(A) 28 liters
(B) 30 liters
(C) 32 liters
(D) 34 liters
Answer: Option C
Question No. 269
The increased cohesiveness of concrete, makes it
(A) Less liable to segregation
(B) More liable to segregation
(C) More liable to bleeding
(D) More liable for surface scaling in frosty weather
Answer: Option A
Question No. 270
Concrete is unsuitable for compaction by a vibrator if it is
(A) Dry
(B) Earth moist
(C) Semi-plastic
(D) Plastic
Answer: Option D
Question No. 271
In order to obtain the best workability of concrete, the preferred shape of aggregate is
(A) Rounded
(B) Elongated
(C) Angular
(D) All of the above
Answer: Option A
Question No. 272
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: Option D
Question No. 273
An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be
flaky if its least dimension is less than
(A) 22.5 mm
(B) 18.5 mm
(C) 16.5 mm
(D) 13.5 mm
Answer: Option D
Question No. 274
Approximate value of shrinkage strain in concrete, is
(A) 0.003
(B) 0.0003
(C) 0.00003
(D) 0.03
Answer: Option B
Question No. 275
For quality control of Portland cement, the test essentially done is
(A) Setting time
(B) Tensile strength
(C) Consistency
(D) All the above
Answer: Option D
Question No. 276
Strength of concrete with passage of time
(A) Increases
(B) Decreases
(C) Fluctuates
(D) Remains constant
Answer: Option A
Question No. 277
Which of the following statements is incorrect?
(A) Higher Vee-Bee time shows lower workability
(B) Higher slump shows higher workability
(C) Higher compacting factor shows higher workability
(D) None of the above
Answer: Option D
Question No. 278
To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a
temperature between
(A) 1100° and 1200°C
(B) 1200° and 1300°C
(C) 1300° and 1400°C
(D) 1400° and 1500°C
Answer: Option D
Question No. 279
In a pile of length , the points of suspension from ends for lifting it are located at
(A) 0.207 l
(B) 0.25 l
(C) 0.293 l
(D) 0.333 l
Answer: Option A
Question No. 280
Curing a concrete for long period ensures better
(A) Volume stability
(B) Strength
(C) Water resistance
(D) All the above
Answer: Option D
Question No. 281
In a ring beam subjected to uniformly distributed load
(i) Shear force at mid span is zero
(ii) Shear force at mid span is maximum
(iii) Torsion at mid span is zero
(iv) Torsion at mid span is maximum
The correct answer is
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)
Answer: Option A
Question No. 282
Batching error means inaccuracy in the quantity of
(A) Aggregates
(B) Cement
(C) Water
(D) All the above
Answer: Option D
Question No. 283
If the storey height is equal to length of RCC wall, the percentage increase in strength is
(A) 0
(B) 10
(C) 20
(D) 30
Answer: Option B
Question No. 284
If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P)
of fine aggregates to combined aggregates, is
(A) P = [(Z - X)/(Z - Y)] × 100
(B) P = [(X - Z)/(Z - Y)] × 100
(C) P = [(X - Z)/(Z + Y)] × 100
(D) P = [(Z + X)/(Z - Y)] × 100
Answer: Option B
Question No. 285
If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the
beam is called
(A) Balanced beam
(B) Under-reinforced beam
(C) Over-reinforced beam
(D) None of the above
Answer: Option C
Question No. 286
Proper proportioning of concrete, ensures
(A) Desired strength and workability
(B) Desired durability
(C) Water tightness of the structure
(D) All the above
Answer: Option D
Question No. 287
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is
given by
(A) fcr - fcs = fcl
(B) fcr > fcs > fcl
(C) fcr < fcs < fcl
(D) fcs > fcr > fcl
Answer: Option B
Question No. 288
Wp and Wf
are the weights of a cylinder containing partially compacted and fully compacted
concrete. If the compaction factor (Wp/Wf
) is 0.95, the workability of concrete is
(A) Extremely low
(B) Very low
(C) Low
(D) High
Answer: Option D
Question No. 289
Air entrainment in the concrete increases
(A) Workability
(B) Strength
(C) The effects of temperature variations
(D) The unit weight
Answer: Option A
Question No. 290
Construction joints are provided
(A) Where B.M. and S.F. are small
(B) Where the member is supported by other member
(C) At 18 m apart in huge structures
(D) All the above
Answer: Option D
Question No. 291
Maximum distance between expansion joints in structures as per IS: 456 1978 is
(A) 20 m
(B) 30 m
(C) 45 m
(D) 60 m
Answer: Option C
Question No. 292
Ordinary concrete is not used for concrete grade
(A) M 100
(B) M 150
(C) M 250
(D) M 400
Answer: Option D
Question No. 293
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the
meridional force is always
(A) Zero
(B) Tensile
(C) Compressive
(D) Tensile or compressive
Answer: Option C
Question No. 294
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: Option C
Question No. 295
The depth of footing for an isolated column is governed by
(i) Maximum bending moment
(ii) Shear force
(iii) Punching shear
The correct answer is
(A) Only (i)
(B) (i) and (ii)
(C) (i) and (iii)
(D) All (i), (ii) and (iii)
Answer: Option D
Question No. 296
While designing an air entrained concrete
(A) Water cement ratio is reduced
(B) Proportion of aggregates is reduced
(C) An allowance for the entrained air is made
(D) All the above
Answer: Option D
Question No. 297
Minimum thickness of load bearing RCC wall should be
(A) 50 mm
(B) 100 mm
(C) 150 mm
(D) 200 mm
Answer: Option B
Question No. 298
M 150 grade of concrete approximates
(A) 1 : 3 : 6 mix
(B) 1 : 1 :2 mix
(C) 1 : 2 : 4 mix
(D) 1 : 1.5 : 3 mix
Answer: Option B
Question No. 299
The effect of adding calcium chloride in concrete is
(i) To increase shrinkage
(ii) To decrease shrinkage
(iii) To increase setting time
(iv) To decrease setting time
The correct answer is
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)
Answer: Option B
Question No. 300
Permissible compressive strength of M 300 concrete grade is
(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 300 kg/cm2
Answer: Option D
Question No. 301
Strength of concrete increases with
(A) Increase in water-cement ratio
(B) Increase in fineness of cement
(C) Decrease in curing time
(D) Decrease in size of aggregate
Answer: Option B
Question No. 302
For ensuring quality of concrete, use
(A) Single sized aggregates
(B) Two sized aggregate
(C) Graded aggregates
(D) Coarse aggregates
Answer: Option C
Question No. 303
In working stress design, permissible bond stress in the case of deformed bars is more than that in
plain bars by
(A) 10 %
(B) 20 %
(C) 30 %
(D) 40 %
Answer: Option D
Question No. 304
Workability improved by adding
(A) Air-entraining agent
(B) Foaming agent
(C) Oily-agent
(D) All the above
Answer: Option D
Question No. 305
The maximum value of hoop compression in a dome is given by
(A) wR / 4d
(B) wR/2d
(C) wR/d
(D) 2wR/d
Where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome
Answer: Option B
Question No. 306
The rock which is not calcareous, is:
(A) Lime stone
(B) Chalk
(C) Laterite
(D) None of these
Answer: Option D
Question No. 307
A T-shaped retaining wall mainly consists of
(A) One cantilever
(B) Two cantilevers
(C) Three cantilevers
(D) Four cantilevers
Answer: Option C
Question No. 308
Pick up the correct statement from the following:
(A) Insufficient quantity of water makes the concrete mix harsh
(B) Insufficient quantity of water makes the concrete unworkable
(C) Excess quantity of water makes the concrete segregated
(D) All the above
Answer: Option D
Question No. 309
The fineness modulus of fine aggregate is in the range of
(A) 2.0 to 3.5
(B) 3.5 to 5.0
(C) 5.0 to 7.0
(D) 6.0 to 8.5
Answer: Option A
Question No. 310
After casting, an ordinary cement concrete on drying
(A) Expands
(B) Mix
(C) Shrinks
(D) None of these
Answer: Option C
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