Concrete Technology objective question and answer
Question No. 103
The effect of creep on modular ratio is
(A) To decrease it
(B) To increase it
(C) Either to decrease or to increase it
(D) To keep it unchanged
Answer: Option B
Question No. 104
The type of aggregates not suitable for high strength concrete and for pavements subjected to
tension, is
(A) Rounded aggregate
(B) Irregular aggregate
(C) Angular aggregate
(D) Flaky aggregate
Answer: Option A
Question No. 105
The maximum percentage of chemical ingredient of cement is that of
(A) Magnesium oxide
(B) Iron oxide
(C) Silica
(D) Lime
Answer: Option D
Question No. 106
Select the incorrect statement
(A) The loss of pre-stress is more in pre-tensioning system than in post-tensioning system.
(B) Pre-tensioning system has greater certainty about its durability.
(C) For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper
than pre-tensioning system
(D) None of the above
Answer: Option D
Question No. 107
The commercial name of white and coloured cement in India, is
(A) Colorcrete
(B) Silvicrete
(C) Snowcem
(D) All the above
Answer: Option D
Question No. 108
An excess of flaky particles in concrete aggregates
(A) Decreases the workability
(B) Increases the quantity of water and sand
(C) More than 15% are not desirable
(D) All the above
Answer: Option D
Question No. 109
Increase in the moisture content in concrete
(A) Reduces the strength
(B) Increases the strength
(C) Does not change the strength
(D) All of the above
Answer: Option A
Question No. 110
Pick up the correct statement from the following:
(A) High percentage of C3S and low percentage of C2S cause rapid hardening
(B) High percentage of C3S and low percentage of C2S make the cement less resistive to chemical
attack
(C) Low percentage of C3S and high percentage of C2S contribute to slow hardening
(D) All the above
Answer: Option D
Question No. 111
The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity
dams should be
(A) Between 150 to 300 kg/cm2
(B) Between 350 to 600 kg/cm2
(C) Between 150 to 500 kg/cm2
(D) Below 200 kg/cm2
Answer: Option D
Question No. 112
Select the incorrect statement
(A) Lean mixes bleed more as compared to rich ones.
(B) Bleeding can be minimized by adding pozzolana finer aggregate
(C) Bleeding can be increased by addition 'of calcium chloride
(D) None of the above
Answer: Option D
Question No. 113
Permissible compressive strength of M 150 concrete grade is
(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 250 kg/cm2
Answer: Option C
Question No. 114
Cement used for normal concrete construction, is obtained by burning a mixture of
(A) Siliceous and argillaceous materials
(B) Argillaceous and calcareous materials
(C) Siliceous and calcareous materials
(D) Siliceous, argillaceous and calcareous materials
Answer: Option D
Question No. 115
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) Higher initial and final setting times
(D) Lower initial and final setting times
Answer: Option A
Question No. 116
The maximum amount of dust which may be permitted in aggregates is
(A) 5% of the total aggregates for low workability with a coarse grading
(B) 10% of the total aggregates for low workability with a fine grading
(C) 20% of the total aggregates for a mix having high workability with fine grading
(D) All the above
Answer: Option D
Question No. 117
If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and
W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is
obtained by the equation
(A) 0.1P + 0.3Y + 0.1Z = W/C × P
(B) 0.3P + 0.1Y + 0.01Z = W/C × P
(C) 0.4P + 0.2Y + 0.01Z = W/C × P
(D) 0.5P + 0.3Y + 0.01Z = W/C × P
Answer: Option B
Question No. 118
Examine the following statements:
(i) Factor of safety for steel should be based on its yield stress,
(ii) Factor of safety for steel should be based on its ultimate stress,
(iii) Factor of safety for concrete should be based on its yield stress,
(iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)
Answer: Option B
Question No. 119
If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm,
1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0
kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
(A) 7.30
(B) 7.35
(C) 7.40
(D) 7.45
Answer: Option C
Question No. 120
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: Option D
Question No. 121
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the
diameter of bar nor less than
(A) 15 mm
(B) 25 mm
(C) 30 mm
(D) 40 mm
Answer: Option D
Question No. 122
Workability of concrete is measured by
(A) Vicat apparatus test
(B) Slump test
(C) Minimum void method
(D) Talbot Richard test
Answer: Option B
Question No. 123
The size of fine aggregates does not exceed
(A) 2.75 mm
(B) 3.00 mm
(C) 3.75 mm
Answer: Option D
Question No. 124
The main reason for providing number of reinforcing bars at a support in a simply supported beam
is to resist in that zone
(A) Compressive stress
(B) Shear stress
(C) Bond stress
(D) Tensile stress
Answer: Option C
Question No. 125
Hardening of cement occurs at
(A) Rapid rate during the first few days and afterwards it continues to increase at a decreased
rate
(B) Slow rate during the first few days and afterwards it continues to increase at a rapid rate
(C) Uniform rate throughout its age
(D) None of these
Answer: Option D
Question No. 126
The entrained air in concrete
(A) Increases workability
(B) Decreases workability
(C) Decreases resistance to weathering
(D) Increases strength
Answer: Option A
Question No. 127
According to IS: 4561978, the flexural strength of concrete is
(A) Directly proportional to compressive strength
(B) Inversely proportional to compressive strength
(C) Directly proportional to square root of compressive strength
(D) Inversely proportional to square root of compressive strength
Answer: Option C
Question No. 128
Slump test is done for
(A) Clay
(B) Sand
(C) Lime
(D) Concrete
Answer: Option D
Question No. 129
Di-calcium silicate (C2S)
(A) Hydrates rapidly
(B) Generates less heat of hydration
(C) Hardens rapidly
(D) Provides less ultimate strength to cement
Answer: Option B
Question No. 130
The limits of percentage p of the longitudinal reinforcement in a column is given by
(A) 0.15% to 2%
(B) 0.8% to 4%
(C) 0.8% to 6%
(D) 0.8% to 8%
Answer: Option C
Question No. 131
The risk of segregation is more for
(A) Wetter mix
(B) Larger proportion of maximum size aggregate
(C) Coarser grading
(D) All the above
Answer: Option D
Question No. 132
Le-Chatelier's apparatus is used for testing
(A) Soundness of cement
(B) Hardness of cement
(C) Strength of cement
(D) Durability of cement
Answer: Option A
Question No. 133
According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is
limited to
(A) 0.43 d
(B) 0.537 d
(C) 0.68 d
(D) 0.85 d
Where d is effective depth of beam
Answer: Option B
Question No. 134
Construction joints are generally provided in concrete
(A) Roads
(B) Retaining walls
(C) Lining of canals
(D) All the above
Answer: Option D
Question No. 135
If a grading curve is horizontal between the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve,
the graded aggregates do not contain
(A) 20 mm particles
(B) 10 mm particles
(C) 4.75 mm particles
(D) All the above
Answer: Option D
Question No. 136
Most common method of pre-stressing used for factory production is
(A) Long line method
(B) Freyssinet system
(C) Magnel-Blaton system
(D) Lee-Macall system
Answer: Option A
Question No. 137
C.R.R.I. charts are used to obtain a relationship between strength of concrete and
(A) Water cement ratio
(B) Workability
(C) Grading of aggregate
(D) Fineness modulus
Answer: Option A
Question No. 138
Pick up the correct statement from the following:
(A) Sand obtained from pits, is washed to remove clay and silt
(B) Sand obtained from flooded pits, need not be washed before use
(C) The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the
concrete is porous
(D) All the above
Answer: Option D
Question No. 139
For the design of retaining walls, the minimum factor of safety against overturning is taken as
(A) 1.5
(B) 2.0
(C) 2.5
(D) 3.0
Answer: Option B
Question No. 140
If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated
with water is 12 cm, the bulking of the moist sand, is
(A) 10 %
(B) 12 %
(C) 15 %
(D) 25 %
Answer: Option D
Question No. 141
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: Option C
Question No. 142
If the foundations of all the columns of a structure are designed on the total live and dead load
basis, then
(A) There will be no settlement of columns
(B) There will be no differential settlement
(C) The settlement of exterior columns will be more than interior columns
(D) The settlement of interior columns will be more than exterior columns
Answer: Option C
Question No. 143
Saw dust can be rendered chemically inert by boiling it in water containing
(A) Ferrous sulphate
(B) Potassium chloride
(C) Ammonia
(D) Nitric acid
Answer: Option A
Question No. 144
A concrete having a slump of 6.5 cm, is said to be
(A) Dry
(B) Earth moist
(C) Semi-plastic
(D) Plastic
Answer: Option D
Question No. 145
Shrinkage of concrete depends upon
(i) Humidity of atmosphere
(ii) Passage of time
(iii) Stress
The correct answer is
(A) (i) and (ii)
(B) (ii) and (iii)
(C) Only (iii)
(D) All (i), (ii) and (iii)
Answer: Option A
Question No. 146
To obtain a very high strength concrete, use very fine grained
(A) Granite
(B) Magnetite
(C) Barite
(D) Volcanic scoria
Answer: Option A
Question No. 147
Vicat apparatus is used for
(A) Fineness test
(B) Consistency test
(C) Test for setting time
(D) Test for tensile strength
Answer: Option B
Question No. 148
Which of the following losses of pre-stress occurs only in pre-tensioning and not in post-
tensioning?
(A) Elastic shortening of concrete
(B) Shrinkage of concrete
(C) Creep of concrete
(D) Loss due to friction
Answer: Option A
Question No. 149
The type of aggregates of same nominal size, which contain less voids when compacted, are
(A) Rounded spherical
(B) Irregular
(C) Flaky
(D) None of these
Answer: Option A
Question No. 150
Pick up the correct statement from the following:
(A) Continuous grading is not necessary for obtaining a minimum of air voids
(B) The omission of a certain size of aggregate is shown by a straight horizontal line on the
grading curve
(C) The omission of a certain size of aggregate in concrete increases the workability but also
increases the liability to segregation
(D) All the above
Answer: Option D
Question No. 151
Pre-stress loss due to friction occurs
(A) Only in post-tensioned beams
(B) Only in pre-tensioned beams
(C) In both post-tensioned and pre-tensioned beams
(D) None of the above
Answer: Option A
Question No. 152
Pick up the correct statement from the following:
(A) An increase in water content must be accompanied by an increase in cement content
(B) Angular and rough aggregates reduce the workability of the concrete
(C) The slump of the concrete mix decreases due to an increase in temperature
(D) All the above
Answer: Option D
Question No. 153
In the method of voids for determination of the quantity of cement paste, it is assumed that
(A) Voids in coarse aggregates are filled by fine aggregates
(B) Voids in fine aggregates are filled by the cement paste
(C) Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
(D) All the above
Answer: Option D
Question No. 154
As compared to ordinary Portland cement, use of pozzolana cement
(A) Reduces workability
(B) Increases bleeding
(C) Increases shrinkage
(D) Increases strength
Answer: Option C
Question No. 155
The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary
method of proportioning
(A) 1 : 1 : 2
(B) 1 : 2 : 4
(C) 1 : 3 : 6
(D) 1 : 4 : 10
Answer: Option D
Question No. 156
The strength and quality of concrete, depend upon:
(A) Grading of aggregates
(B) Surface area of aggregates
(C) Shape of aggregates
(D) All the above
Answer: Option D
Question No. 157
The factor of safety for
(A) Steel and concrete are same
(B) Steel is lower than that for concrete
(C) Steel is higher than that for concrete
(D) None of the above
Answer: Option B
Question No. 158
The preliminary test is repeated if the difference of compressive strength of three test specimens,
exceeds
(A) 5 kg/cm2
(B) 8 kg/cm2
(C) 10 kg/cm2
(D) 15 kg/cm2
Answer: Option D
Question No. 159
Setting time of cement increases by adding
(A) Gypsum
(B) Hydrogen peroxide
(C) Calcium chloride
(D) Sodium oxide
Answer: Option A
Question No. 160
According to IS: 4561978, the maximum reinforcement in a column is
(A) 2 %
(B) 4 %
(C) 6 %
(D) 8 %
Answer: Option C
Question No. 161
According to the recommendations of IS : 456-1978, the expansion joints
(A) Are provided where plane changes abruptly
(B) Are provided to ensure minimum resistance
(C) Do not carry reinforcement across them
(D) All the above
Answer: Option D
Question No. 162
The impurity of mixing water which affects the setting time and strength of concrete, is
(A) Sodium sulphates
(B) Sodium chlorides
(C) Sodium carbonates and bicarbonates
(D) Calcium bicarbonates
Answer: Option C
Question No. 163
If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths of
column strip and middle strip are
(A) 3.0 m and 1.5 m
(B) 1.5 m and 3.0 m
(C) 3.0 m and 3.0 m
(D) 1.5 m and 1.5 m
Answer: Option C
Question No. 164
Pick up the incorrect statement from the following:
(A) The bottom and top ends of slump mould are parallel to each other
(B) The axis of the mould is perpendicular to the end faces
(C) The internal surface of the mould is kept clean and free from set cement
(D) The mould is in the form of a frustum of hexagonal pyramid
Answer: Option D
Question No. 165
The concrete mix which causes difficulty in obtaining a smooth finish, possess
(A) Segregation
(B) Internal friction
(C) Hardness
(D) Bleeding
Answer: Option C
Question No. 166
While designing the pile as a column, the end conditions are nearly
(A) Both ends hinged
(B) Both ends fixed
(C) One end fixed and other end hinged
(D) One end fixed and other end free
Answer: Option C
Question No. 167
The internal dimensions of a ware house are 15 m × 5.6 m, and the maximum height of piles is
2.70 m, the maximum number of bags to be stored in two piles, are
(A) 1500 bags
(B) 2000 bags
(C) 2500 bags
(D) 3000 bags
Answer: Option D
Question No. 168
Pick up the incorrect statement from the following. While performing preliminary test on concrete
(A) Proportions of the material and water should be the same as to be used at the work site
(B) Cement should be mixed by hand in order to maintain uniformity
(C) Concrete mix should be stored in air-tight containers
(D) Concrete ingredients should be kept at a temperature of 37° ± 2°C
Answer: Option D
Question No. 169
In a spherical dome the hoop stress due to a concentrated load at crown is
(A) Compressive everywhere
(B) Tensile everywhere
(C) Partly compressive and partly tensile
(D) Zero
Answer: Option B
Question No. 170
I.S. Sieve Nos. 10 mm and 4.75 mm are generally used for grading of
(A) Coarse aggregates
(B) Fine aggregates
(C) Neither (a) nor (b)
(D) Both (a) and (b)
Answer: Option D
Question No. 171
Log Angles machine is used to test the aggregate for
(A) Crushing strength
(B) Impact value
(C) Abrasion resistance
(D) Water absorption
Answer: Option C
Question No. 172
The property of the ingredients to separate from each other while placing the concrete is called
(A) Segregation
(B) Compaction
(C) Shrinkage
(D) Bulking
Answer: Option A
Question No. 173
Pick up the correct statement from the following:
(A) Higher workability indicates unexpected increase in the moisture content
(B) Higher workability indicates deficiency of sand
(C) If the concrete mix is dry, the slump is zero
(D) All the above
Answer: Option D
Question No. 174
The process of mixing, transporting, placing and compacting concrete using Ordinary Port land
Cement should not take more than
(A) 30 minutes
(B) 40 minutes
(C) 60 minutes
(D) 90 minutes
Answer: Option A
Question No. 175
The strength of concrete after one year as compared to 28 days strength is about
(A) 10 to 15% more
(B) 15 to 20% more
(C) 20 to 25% more
(D) 25 to 50% more
Answer: Option C
Question No. 176
Specified compressive strength of concrete is obtained from cube tests at the end of
(A) 3 days
(B) 7 days
(C) 21 days
(D) 28 days
Answer: Option D
Question No. 177
Pick up the incorrect statement from the following:
(A) Tricalcium silicate (C3S) hydrates rapidly
(B) Tricalcium silicate (C3S) generates more heat of hydration
(C) Tricalcium silicate (C3S) develops early strength
(D) Tricalcium silicate (C3S) has more resistance to sulphate attack
Answer: Option D
Question No. 178
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly
reinforced rectangular balanced section will be
(A) 0.35 d
(B) 0.40 d
(C) 0.45 d
(D) Dependent on grade of concrete also
Answer: Option B
Question No. 179
A construction joint is provided where
(A) Bending moment is small
(B) Shear force is small
(C) The member is supported by other member
(D) All the above
Answer: Option D
Question No. 180
Sand generally contains salt if it is obtained from:
(A) Nala beds
(B) River beds
(C) Sea beds
(D) None of these
Answer: Option C
Question No. 181
According to IS: 4561978, minimum slenderness ratio for a short column is
(A) Less than 12
(B) Less than 18
(C) Between 18 and 24
(D) More than 24
Answer: Option A
Question No. 182
Water cement ratio is
(A) Volume of water to that of cement
(B) Weight of water to that of cement
(C) Weight of concrete to that of water
(D) Both (a) and (b) of the above
Answer: Option D
Question No. 183
For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water
required per bag, is
(A) 10 kg
(B) 12 kg
(C) 14 kg
(D) 16 kg
Answer: Option C
Question No. 184
Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the centre of slab bearing where x is equal to
(A) l/3
(B) l/5
(C) l/7
(D) l/10
Answer: Option C
Question No. 185
Pick up the incorrect statement from the following:
(A) In properly graded aggregates, bulk density is more
(B) In single size aggregates, bulk density is least
(C) In single size aggregates, bulk density is maximum
(D) None of these
Answer: Option C
Question No. 186
To prevent segregation, the maximum height for placing concrete, is
(A) 100 cm
(B) 125 cm
(C) 150 cm
(D) 200 cm
Answer: Option A
Question No. 187
For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical
deflection limits should be
(A) 600 mm
(B) 750 mm
(C) 900 mm
(D) More than 1 m
Answer: Option B
Question No. 188
For compacting plain concrete road surface of thickness less than 20 cm, we use
(A) Internal vibrator
(B) Screed vibrator
(C) Form vibrator
(D) None of these
Answer: Option B
Question No. 189
Expansion joints are provided if the length of concrete structures exceeds
(A) 10 m
(B) 15 m
(C) 15 m
(D) 45 m
Answer: Option D
Question No. 190
The permissible diagonal tensile stress in reinforced brick work is
(A) About 0.1 N/mm²
(B) Zero
(C) 0.3 N/mm² to 0.7 N/mm²
(D) About 1.0 N/mm²
Answer: Option A
Question No. 191
Pick up the correct statement from the following:
(A) According to the petrological characteristics, concrete aggregates are classified as heavy
weight, normal weight and light weight
(B) According to the shape of the particles, concrete aggregates are classified as rounded
irregular, angular and flaky
(C) According to the surface texture of the particles, the concrete aggregates are classified as
glassy, smooth, granular, rough, crystalline, honey combed and porous
(D) All the above
Answer: Option D
Question No. 192
Pick up the correct statement from the following:
(A) The concrete gains strength due to hydration of cement
(B) The concrete does not set at freezing point
(C) The strength of concrete increases with its age
(D) All the above
Answer: Option D
Question No. 193
Separation of water or water sand cement from a freshly concrete, is known
(A) Bleeding
(B) Creeping
(C) Segregation
(D) Flooding
Answer: Option A
Question No. 194
The critical section for finding maximum bending moment for footing under masonry wall is
located
(A) At the middle of the wall
(B) At the edge of the wall
(C) Halfway between the middle and edge of the wall
(D) At a distance equal to effective depth of footing from the edge of the wall
Answer: Option C
Question No. 195
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: Option A
Question No. 196
Sinking of an intermediate support of a continuous beam
(i) Reduces the negative moment at support
(ii) Increases the negative moment at support
(iii) Reduces the positive moment at center of span
(iv) Increases the positive moment at center of span
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. 197
High temperature
(A) Increases the strength of concrete
(B) Decreases the strength of concrete
(C) Has no effect on the strength of concrete
(D) None of these
Answer: Option B
Question No. 198
Horizontal construction joints in concrete walls are generally provided at
(A) Soffit level
(B) Window sill level
(C) Floor level
(D) All the above
Answer: Option D
Question No. 199
Stress strain curve of high tensile steel
(A) Has a definite yield point
(B) Does not show definite yield point but yield point is defined by 0.1% proof stress
(C) Does not show definite yield point but yield point is defined by 0.2% proof stress
(D) Does not show definite yield point but yield point is defined by 2% proof stress,
Answer: Option C
Question No. 200
Addition of pozzolana to cement causes
(A) Reduction in permeability
(B) Loss of heat of hydration
(C) Reduction in bleeding
(D) All the above
Answer: Option D
Question No. 201
Permissible compressive strength of M 200 concrete grade is
(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 250 kg/cm2
Answer: Option C
Question No. 202
The minimum diameter of longitudinal bars in a column is
(A) 6 mm
(B) 8 mm
(C) 12 mm
(D) 16 mm
Answer: Option C
Question No. 203
The high strength of rapid hardening cement at early stage, is due to its
(A) Finer grinding
(B) Burning at high temperature
(C) Increased lime cement
(D) Higher content of tricalcium
Answer: Option C
Question No. 204
Sand requiring a high water cement ratio, belongs to
(A) Zone I
(B) Zone II
(C) Zone III
(D) Zone IV
Answer: Option A
Question No. 205
Minimum grade of concrete to be used in reinforced concrete as per IS: 4561978 is
(A) M 15
(B) M 20
(C) M 10
(D) M 25
Answer: Option A
Question No. 206
While compacting the concrete by a mechanical vibrator, the slump should not exceed
(A) 2.5 cm
(B) 5.0 cm
(C) 7.5 cm
(D) 10 cm
Answer: Option B
Question No. 207
Non-uniform compaction may cause the concrete
(A) Porous
(B) Non-homogeneous
(C) Reduced strength
(D) All the above
Answer: Option D
Question No. 208
Modulus of rupture of concrete is a measure of
(A) Flexural tensile strength
(B) Direct tensile strength
(C) Compressive strength
(D) Split tensile strength
Answer: Option A
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