Concrete Technology and Design
Objective Questions and Answers – Set 01
Q1. The temperature reinforcement in the
vertical slab of a T-shaped R.C. retaining wall is
(A)
Not needed
(B) Provided equally on inner and front faces
(C) Provided more on inner face than on front face
(D) Provided more on front face than on inner face
Show Answer
Answer:
(D) Provided more on front face than on inner face
Q2. Critical section for shear in case of
flat slabs is at a distance of
(A)
Effective depth of slab from periphery of column/drop panel
(B) d/2 from periphery of column/capital/ drop panel
(C) At the drop panel of slab
(D) At the periphery of column
Show Answer
Answer:
(B) d/2 from periphery of column/capital/ drop panel
Q3. Pick up the incorrect statement from the
following:
(A)
The degree of grinding of cement, is called fineness
(B) The process of changing cement paste into hard mass, is known as setting of
cement
(C) The phenomenon by virtue of which cement does not allow transmission of
sound, is known as soundness of cement
(D) The heat generated during chemical reaction of cement with water, is known
as heat of hydration
Show Answer
Answer:
(C) The phenomenon by virtue of which cement does not allow transmission of
sound, is known as soundness of cement
Q4. Bulking of sand is maximum if moisture
content is about
(A)
2 %
(B) 4 %
(C) 6 %
(D) 10 %
Show Answer
Answer:
(B) 4 %
Q5. 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
Show Answer
Answer:
(B) Rapid hardening cement
Q6. 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
Show Answer
Answer:
(C) Hydration of cement
Q7. Diagonal tension in a beam
(A)
Is maximum at neutral axis
(B) Decreases below the neutral axis and increases above the neutral axis
(C) Increases below the neutral axis and decreases above the neutral axis
(D) Remains same
Show Answer
Answer:
(D) Remains same
Q8. Pick up the incorrect statement from
the following:
(A)
Space between the exterior walls of a warehouse and bag piles should be 30 cm
(B) Cement bags should preferably be piled on wooden planks
(C) Width and height of the pile should not exceed 3 m and 2.70 m respectively
(D) None of these
Show Answer
Answer:
(D) None of these
Q9. To determine the modulus of rupture,
the size of test specimen used is
(A)
150 × 150 × 500 mm
(B) 100 × 100 × 700 mm
(C) 150 × 150 × 700 mm
(D) 100 × 100 × 500 mm
Show Answer
Answer:
(C) 150 × 150 × 700 mm
Q10. According to IS: 4561978, the column
or the strut is the member whose effective length is greater than
(A)
The least lateral dimension
(B) 2 times the least lateral dimension
(C) 3 times the least lateral dimension
(D) 4 times the least lateral dimension
Show Answer
Answer:
(C) 3 times the least lateral dimension
Q11. For a slab supported on its four edges
with corners held down and loaded uniformly, the Marcus correction factor to
the moments obtained by Grashoff Rankine’s theory
(A)
Is always less than 1
(B) Is always greater than 1
(C) Can be more than 1
(D) Can be less than 1
Show Answer
Answer:
(A) Is always less than 1
Q12. Tricalcium aluminate (C3A)
(A)
Reacts fast with water
(B) Generates less heat of hydration
(C) Causes initial setting and early strength of cement
(D) Does not contribute to develop ultimate strength
Show Answer
Answer:
(B) Generates less heat of hydration
Q13. When shear stress exceeds the
permissible limit in a slab, then it is reduced by
(A)
Increasing the depth
(B) Providing shear reinforcement
(C) Using high strength steel
(D) Using thinner bars but more in number
Show Answer
Answer:
(A) Increasing the depth
Q14. Addition of pozzolana to ordinary port
land cement, causes
(A)
Decrease in early strength
(B) Reduction in chemical action with sulphates
(C) Increase in shrinkage
(D) All the above
Show Answer
Answer:
(D) All the above
Q15. 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 100
(B) M 150
(C) M 200
(D) M 250
Show Answer
Answer:
(A) M 100
Concrete Technology and Design
Multiple Choice Tests – Set 02
Q1. The diameter of ties in a column should
be
(A)
More than or equal to one fourth of diameter of main bar
(B) More than or equal to 5 mm
(C) More than 5 mm but less than one-fourth of diameter of main bar
(D) More than 5 mm and also more than one-fourth of diameter of main bar
Show Answer
Answer:
(D) More than 5 mm and also more than one-fourth of diameter of main bar
Q2. Pick up the correct statement from the
following:
(A)
The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
(B) The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
(C) The material having particles of size varying from 0.06 mm to 0.002 mm, is
known as silt
(D) All the above
Show Answer
Answer:
(D) All the above
Q3. Admixtures which cause early setting
and hardening of concrete are called
(A)
Workability admixtures
(B) Accelerators
(C) Retarders
(D) Air entraining agents
Show Answer
Answer:
(B) Accelerators
Q4. In counterfort retaining walls, the
main reinforcement in the stem at support is
(A)
Not provided
(B) Provided only on inner face
(C) Provided only on front face
(D) Provided both on inner and front faces
Show Answer
Answer:
(B) Provided only on inner face
Q5. In a counterfort retaining wall, the
main reinforcement is provided on the
(i) Bottom face in front counterfort
(ii) Inclined face in front counterfort
(iii) Bottom face in back counterfort
(iv) Inclined face in back counterfort
The correct answer is
(A)
(i) and (ii)
(B) (ii) and (iii)
(C) (i) and (iv)
(D) (iii) and (iv)
Show Answer
Answer:
(C) (i) and (iv)
Q6. Pick up the correct statement from the
following:
(A)
Sand stones may be divided into calcareous, siliceous and ferruginous sand
stones
(B) Concrete using sand stones, cracks due to excessive shrinkage
(C) Broken bricks produce a concrete having good fire resisting qualities
(D) All the above
Show Answer
Answer:
(D) All the above
Q7. Due to shrinkage stresses, a simply
supported beam having reinforcement only at bottom tends to
(A)
Deflect downward
(B) Deflect upward
(C) Deflect downward or upward
(D) None of the above
Show Answer
Answer:
(A) Deflect downward
Q8. For construction of structures in sea
water, the cement generally preferred to, is
(A)
Portland-pozzolana cement
(B) Quick setting cement
(C) Low heat Portland cement
(D) Rapid hardening cement
Show Answer
Answer:
(A) Portland-pozzolana cement
Q9. Pick up the incorrect statement from
the following:
(A)
Admixtures accelerate hydration
(B) Admixtures make concrete water proof
(C) Admixtures make concrete acid proof
(D) Admixtures give high strength
Show Answer
Answer:
(A) Admixtures accelerate hydration
Q10. The purpose of reinforcement in
pre-stressed concrete is
(A)
To provide adequate bond stress
(B) To resist tensile stresses
(C) To impart initial compressive stress in concrete
(D) All of the above
Show Answer
Answer:
(C) To impart initial compressive stress in concrete
Q11. 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
Show Answer
Answer:
(B) Ponding method
Q12. For a reinforced concrete section, the
shape of shear stress diagram is
(A)
Wholly parabolic
(B) Wholly rectangular
(C) Parabolic above neutral axis and rectangular below neutral axis
(D) Rectangular above neutral axis and parabolic below neutral axis
Show Answer
Answer:
(C) Parabolic above neutral axis and rectangular below neutral axis
Q13. Select the correct statement
(A)
Elastic modulus of high tensile steel is nearly the same as that of mild steel
(B) Elastic modulus of high tensile steel is more than that of mild steel
(C) Carbon percentage in high carbon steel is less than that in mild steel
(D) High tensile steel is cheaper than mild steel
Show Answer
Answer:
(A) Elastic modulus of high tensile steel is nearly the same as that of mild
steel
Q14. The centroid of compressive force,
from the extreme compression fiber, in limit state design lies at a distance of
(A)
0.367 xu
(B) 0.416 xu
(C) 0.446 xu
(D) 0.573 xu
Where xu is the depth of neutral axis at the limit state of collapse
Show Answer
Answer:
(B) 0.416 xu
Q15. Allowable shear strength of concrete,
depends upon
(A)
Shear strength
(B) Tensile strength
(C) Compressive strength
(D) None of these
Show Answer
Answer:
(A) Shear strength
Concrete Technology Objective
Questions with Answers pdf Download – Set 03
Q1. To minimize the effect of differential
settlement, the area of a footing should be designed for
(A)
Dead load only
(B) Dead load + live load
(C) Dead load + fraction of live load
(D) Live load + fraction of dead load
Show Answer
Answer:
(C) Dead load + fraction of live load
Q2. Pick up the correct statement from the
following:
(A)
Construction joints are necessarily planned for their locations
(B) Expansion joints are provided to accommodate thermal expansion
(C) Construction joints are provided to control shrinkage cracks
(D) All the above
Show Answer
Answer:
(D) All the above
Q3. 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) 50 times
Show Answer
Answer:
(B) 25 times
Q4. Due to circumferential action of the
spiral in a spirally reinforced column
(A)
Capacity of column is decreased
(B) Ductility of column reduces
(C) Capacity of column is decreased but ductility of column increases
(D) Both the capacity of column and ductility of column increase
Show Answer
Answer:
(D) Both the capacity of column and ductility of column increase
Q5. The bulk density of aggregates, depends
upon
(A)
Shape
(B) Grading
(C) Compaction
(D) All the above
Show Answer
Answer:
(D) All the above
Q6. The individual variation between test
strength of sample should not be more than
(A)
±5 % of average
(B) ± 10 % of average
(C) ± 15 % of average
(D) ± 20 % of average
Show Answer
Answer:
(C) ± 15 % of average
Q7. For concreting of heavily reinforced
sections without vibration, the workability of concrete expressed as compacting
factor should be
(A)
0.75 – 0.80
(B) 0.80 – 0.85
(C) 0.85 – 0.92
(D) Above 0.92
Show Answer
Answer:
(D) Above 0.92
Q8. In symmetrically reinforced sections,
shrinkage stresses in concrete and steel are respectively
(A)
Compressive and tensile
(B) Tensile and compressive
(C) Both compressive
(D) Both tensile
Show Answer
Answer:
(B) Tensile and compressive
Q9. Pick up the incorrect statement from
the following. For performing compressive strength test of cement
(A)
Cement and standard sand mortar are used in the ratio of 1 : 3
(B) Water is added at the rate of (P/4) + 3.0 percentage of water where P is
the percentage of water for standard consistency
(C) A cube mould of 10 cm × 10 cm × 10 cm is used
(D) The prepared moulds are kept in a atmosphere of 50% relative humidity
Show Answer
Answer:
(A) Cement and standard sand mortar are used in the ratio of 1 : 3
Q10. Workability of concrete is directly
proportional to
(A)
Aggregate cement ratio
(B) Time of transit
(C) Grading of the aggregate
(D) All of above
Show Answer
Answer:
(C) Grading of the aggregate
Q11. 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
Show Answer
Answer:
(D) All the above
Q12. Pick up the incorrect statement from
the following:
(A)
Concrete for which preliminary tests are conducted, is called controlled
concrete
(B) Bulking of sand depends upon the fineness of grains
(C) Concrete mix 1 : 6 : 12, is used for mass concrete in piers
(D) All the above
Show Answer
Answer:
(D) All the above
Q13. Which of the following statements is
incorrect?
(A)
Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%
(B) Spacing of longitudinal bars measured along the periphery of column should
not exceed 300 mm
(C) Reinforcing bars in a column should not be less than 12 mm in diameter
(D) The number of longitudinal bars provided in a circular column should not be
less than four
Show Answer
Answer:(D)
The number of longitudinal bars provided in a circular column should not be
less than four
Q14. Which of the following has high
tensile strength?
(A)
Plain hot rolled wires
(B) Cold drawn wires
(C) Heat treated rolled wires
(D) All have same tensile strength
Show Answer
Answer:
(B) Cold drawn wires
Q15. The slab is designed as one way if the
ratio of long span to short span is
(A)
Less than 1
(B) Between 1 and 1.5
(C) Between 1.5 and 2
(D) Greater than 2
Show Answer
Answer:
(D) Greater than 2
Concrete Technology and Design
MCQ pdf – Set 04
Q1. For the construction of cement concrete
dams, the maximum permissible size of the aggregates, is
(A)
40 mm
(B) 50 mm
(C) 60 mm
(D) 70 mm
Show Answer
Answer:
(A) 40 mm
Q2. For batching 1:3:6 concrete mix by
volume, the ingredients required per bag of 50 kg cement, are:
(A)
70 liters of sand and 120 liters of aggregates
(B) 70 kg of sand and 140 liters of aggregates
(C) 105 liters of sand and 140 liters of aggregates
(D) 105 liters of sand and 210 liters of aggregates
Show Answer
Answer:
(D) 105 liters of sand and 210 liters of aggregates
Q3. Concrete containing
(A)
Siliceous aggregates, has higher co-efficient of expansion
(B) Igneous aggregates, has intermediate coefficient of expansion
(C) Lime stones, has lowest co-efficient of expansion
(D) All the above
Show Answer
Answer:
(D) All the above
Q4. VPick 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
Show Answer
Answer:
(A) With passage of time, the strength of cement increases
Q5. A concrete using an air entrained cement
(A)
Has strength less than 10% to 15%
(B) Has more resistance to weathering
(C) Is more plastic and workable
(D) Is free from segregation and bleeding
Show Answer
Answer:
(C) Is more plastic and workable
Q6. The lower water cement ratio in
concrete, introduces
(A)
Smaller creep and shrinkage
(B) Greater density and smaller permeability
(C) Improved frost resistance
(D) All the above
Show Answer
Answer:
(D) All the above
Q7. The load carrying capacity of a
helically reinforced column as compared to that of a tied column is about
(A)
5 % less
(B) 10 % less
(C) 5 % more
(D) 10 % more
Show Answer
Answer:
(C) 5 % more
Q8. In the design of a front counterfort in
a counterfort retaining wall, the main reinforcement is provided on
(i) Bottom face near counterfort
(ii) Top face near counterfort
(iii) Bottom face near centre of span
(iv) Top face near centre of span
The correct answer is
(A)
Only (i)
(B) Only (ii)
(C) Both (i) and (iv)
(D) Both (ii) and (iii)
Show Answer
Answer:
(C) Both (i) and (iv)
Q9. In T-shaped R C. retaining walls, the
main reinforcement in the stem is provided on
(A)
The front face in one direction
(B) The front face in both directions
(C) The inner face in one direction
(D) The inner face in both directions
Show Answer
Answer:
(C) The inner face in one direction
Q10. To hydrate 500 kg of cement full water
needed, is
(A)
100 kg
(B) 110 kg
(C) 120 kg
(D) 130 kg
Show Answer
Answer:
(D) 130 kg
Q11. Pick up the correct statement from the
following:
(A)
Segregation is necessary for a workable concrete
(B) Consistency does not affect the workability of concrete
(C) If the concrete mix is dry, the slump is maximum
(D) None of these
Show Answer
Answer:
(D) None of these
Q12. The aggregate containing moisture in
pores and having its surface dry, is known as
(A)
Moist aggregates
(B) Very dry aggregates
(C) Dry aggregates
(D) Saturated surface dry aggregate
Show Answer
Answer:
(D) Saturated surface dry aggregate
Q13. Pick up the correct statement from the
following:
(A)
A highly absorptive aggregate reduces the workability of concrete considerably
(B) The specific gravity of aggregate is important for the determination of the
moisture content
(C) The absorption and porosity of an aggregate influence the property of the
concrete
(D) All the above
Show Answer
Answer:
(D) All the above
Q14. 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)
Show Answer
Answer:
(C) Construction joint
Q15. Pick up the correct statement from the
following:
(A)
Construction joints in columns are provided a few cm below the junction of beam
(B) Construction joints in columns are provided at the bottom hunching
(C) Construction joints in beams and slabs are provided within middle third
(D) All the above
Show Answer
Answer:
(D) All the above
Concrete Technology and Design
of Concrete Structures MCQ – Set 05
Q1. In a counterfort retaining wall, the
main reinforcement in the stem at mid span is provided on
(A)
Front face only
(B) Inner face only
(C) Both front face and inner face
(D) None of the above
Show Answer
Answer:(A)
Front face only
Q2. A beam curved in plan is designed for
(A)
Bending moment and shear
(B) Bending moment and torsion
(C) Shear and torsion
(D) Bending moment, shear and torsion
Show Answer
Answer:
(D) Bending moment, shear and torsion
Q3. According to ISI recommendations, the
maximum depth of stress block for balanced section of a beam of effective depth
d is
(A)
0.43 d
(B) 0.55 d
(C) 0.68 d
(D) 0.85 d
Show Answer
Answer:
(A) 0.43 d
Q4. Under normal conditions using an
ordinary cement, the period of removal of the form work, is:
(A)
7 days for beam soffits
(B) 14 days for bottom slabs of spans 4.6 m and more
(C) 21 days for bottom beams over 6 m spans
(D) All the above
Show Answer
Answer:(D)
All the above
Q5. Pick up the correct statement from the
following:
(A)
Water cement paste hardens due to hydration
(B) During hardening cement binds the aggregates together
(C) Cement provides strength, durability and water tightness to the concrete
(D) All the above
Show Answer
Answer:
(D) All the above
Q6. Pick up the correct proportions of
chemical ingredients of cement
(A)
Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
(B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
(C) Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
(D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3
Show Answer
Answer:
(A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
Q7. Water cement ratio is generally
expressed in volume of water required per
(A)
10 kg
(B) 20 kg
(C) 30 kg
(D) 50 kg
Show Answer
Answer:
(D) 50 kg
Q8. ‘Ware house pack’ of cement means
(A)
Full capacity of the ware house
(B) Pressure exertion of the bags of upper layers
(C) Pressure compaction of the bags on lower layers
(D) Packing the ware house
Show Answer
Answer:(C)
Pressure compaction of the bags on lower layers
Q9. Internal friction between the
ingredients of concrete, is decreased by using
(A)
Less water
(B) Fine aggregates
(C) Rich mix
(D) More water and coarse aggregates
Show Answer
Answer:
(D) More water and coarse aggregates
Q10. The minimum cover in a slab should
neither be less than the diameter of bar nor less than
(A)
10 mm
(B) 15 mm
(C) 25 mm
(D) 13 mm
Show Answer
Answer:(B)
15 mm
Q11. High carbon content in the steel
causes
(A)
Decrease in tensile strength but increase in ductility
(B) Increase in tensile strength but decrease in ductility
(C) Decrease in both tensile strength and ductility
(D) Increase in both tensile strength and ductility
Show Answer
Answer:
(B) Increase in tensile strength but decrease in ductility
Q12. Pick up the correct statement from the
following:
(A)
The quality of water governs the strength of concrete
(B) 10% excess of water reduces the strength of concrete by 15%
(C) 30% excess of water reduces the strength of concrete by 50%
(D) All the above
Show Answer
Answer:
(D) All the above
Q13. To ensure constant moisture content in
aggregates
(A)
Area of each aggregate pile should be large
(B) Height of each aggregate pile should not exceed 1.50 m
(C) Aggregate pile should be left for 24 hours before aggregates are used
(D) All the above
Show Answer
Answer:
(D) All the above
Q14. If the engineer-in-charge approves,
the 10 cm cubes may be used for the work test of concrete provided maximum
nominal size of aggregate, does not exceed
(A)
10 cm
(B) 15 cm
(C) 20 cm
(D) 25 cm
Show Answer
Answer:
(C) 20 cm
Q15. In pre-stressed concrete
(A)
Forces of tension and compression change but lever arm remains unchanged
(B) Forces of tension and compressions remain unchanged but lever arm changes
with the moment
(C) Both forces of tension and compression as well as lever arm change
(D) Both forces of tension and compression as well as lever arm remain
unchanged
Show Answer
Answer:
(B) Forces of tension and compressions remain unchanged but lever arm changes
with the moment
Concrete Technology Civil
Engineering Questions and Answers – Set 06
Q1. Pick up the correct statement from the
following:
(A)
Cement should be mixed for at least one minute
(B) 10% of water is placed in the rotating drum before adding dry material
(C) 10% of water is added after placing the other ingredients in the drum
(D) All the above
Show Answer
Answer:
(D) All the above
Q2. Particles of 0.002 mm size are that of
(A)
Clay
(B) Sand
(C) Gravel
(D) None of these
Show Answer
Answer:
(A) Clay
Q3. Pick up the correct statement from the
following:
(A)
Lime in excess, causes the cement to expand and disintegrate
(B) Silica in excess, causes the cement to set slowly
(C) Alumina in excess, reduces the strength of the cement
(D) All the above
Show Answer
Answer:
(D) All the above
Q4. The average permissible stress in bond
for plain bars in tension is
(A)
Increased by 10% for bars in compression
(B) Increased by 25% for bars in compression
(C) Decreased by 10% for bars in compression
(D) Decreased by 25% for bars in compression
Show Answer
Answer:
(B) Increased by 25% for bars in compression
Q5. Ultimate strength of cold drawn high
steel wires
(A)
Increases with increase in diameter of bar
(B) Decreases with increase in diameter of bar
(C) Does not depend on diameter of bar
(D) None of the above
Show Answer
Answer:
(B) Decreases with increase in diameter of bar
Q6. If the effective plan area of a
warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the
number of cement bags to be stored, is
(A)
2000 bags
(B) 2200 bags
(C) 2400 bags
(D) 2700 bags
Show Answer
Answer:
(D) 2700 bags
Q7. Concrete mainly consists of
(A)
Cement
(B) Aggregates
(C) Water
(D) All the above
Show Answer
Answer:
(D) All the above
Q8. The cement whose strength is a little
lower than the ordinary cement during the first three months but attains
afterwards the same strength, is known as
(A)
Low-heat Portland cement
(B) Rapid hardening Portland cement
(C) Portland blast slag cement
(D) Portland pozzolana cement
Show Answer
Answer:(A)
Low-heat Portland cement
Q9. The property of fresh concrete, in
which the water in the mix tends to rise to the surface while placing and
compacting, is called
(A)
Segregation
(B) Bleeding
(C) Bulking
(D) Creep
Show Answer
Answer:
(B) Bleeding
Q10. For the construction of thin R.C.C.
structures, the type of cement to be avoided, is
(A)
Ordinary Portland cement
(B) Rapid hardening cement
(C) Low heat cement
(D) Blast furnace slag cement
Show Answer
Answer:(D)
Blast furnace slag cement
Q11. The dimensions of a 35 liter forma for
measuring aggregates by volume, are:
(A)
Length 30 cm, breadth 25 cm, height 30 cm
(B) Length 39 cm, breadth 25 cm, height 32 cm
(C) Length 27 cm, breadth 27 cm, height 48 cm
(D) Length 220 cm, breadth 25 cm, height 40 cm
Show Answer
Answer:
(C) Length 27 cm, breadth 27 cm, height 48 cm
Q12. Workability of concrete for a given
water content is good if the aggregates, are
(A)
Rounded aggregate
(B) Irregular aggregate
(C) Angular aggregate
(D) Flaky aggregates
Show Answer
Answer:
(A) Rounded aggregate
Q13. Which of the following R.C. retaining
walls is suitable for heights beyond 6 m?
(A)
L-shaped wall
(B) T-shaped wall
(C) Counterfort type
(D) All of the above
Show Answer
Answer:
(A) Less than 1
Q14. Ratio of permissible stress in direct
compression and bending compression is
(A)
Less than 1
(B) Between 1 and 1.5
(C) Between 1.5 and 2.0
(D) Greater than 2
Show Answer
Answer:
(A) Less than 1
Q15. For preparing ordinary concrete, the
quantity of water used, is
(A)
5% by weight of aggregates plus 20% of weight of cement
(B) 10% by weight of aggregates plus 10% of weight of cement
(C) 5% by weight of aggregates plus 30% of weight of cement
(D) 30% by weight of aggregates plus 10% of weight of cement
Show Answer
Answer:
(C) 5% by weight of aggregates plus 30% of weight of cement
Multiple Choice Questions on
Concrete Technology – Set 07
Q1. Finer grinding of cement
(A)
Affects only the early development of strength
(B) Affects only the ultimate strength
(C) Both (A) and (B)
(D) Does not affect the strength
Show Answer
Answer:
(A) Affects only the early development of strength
Q2. 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
Show Answer
Answer:
(D) None of the above
Q3. 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
Show Answer
Answer:
(D) 40 mm
Q4. The light weight aggregates are
obtained from
(A)
Sedimentary rocks
(B) Metamorphic rocks
(C) Igneous rocks
(D) Volcanic source
Show Answer
Answer:
(D) Volcanic source
Q5. The commercial name of white and
colored cement in India, is
(A)
Colorcrete
(B) Silvicrete
(C) Snowcem
(D) All the above
Show Answer
Answer:
(D) All the above
Q6. Workability of concrete is measured by
(A)
Vicat apparatus test
(B) Slump test
(C) Minimum void method
(D) Talbot Richard test
Show Answer
Answer:
(B) Slump test
Q7. 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
Show Answer
Answer:
(D) All the above
Q8. 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
Show Answer
Answer:
(D) All the above
Q9. The size of fine aggregates does not
exceed
(A)
2.75 mm
(B) 3.00 mm
(C) 3.75 mm
(D) 4.75 mm
Show Answer
Answer:
(D) 4.75 mm
Q10. For walls, columns and vertical faces
of all structural members, the form work is generally removed after
(A)
24 to 48 hours
(B) 3 days
(C) 7 days
(D) 14 days
Show Answer
Answer:
(A) 24 to 48 hours
Q11. 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
Show Answer
Answer:
(A) Reduces the strength
Q12. 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
Show Answer
Answer:
(C) Bond stress
Q13. Efflorescence in cement is caused due
to an excess of
(A)
Alumina
(B) Iron oxide
(C) Silica
(D) Alkalis
Show Answer
Answer:
(D) Alkalis
Q14. 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
Show Answer
Answer:
(D) All the above
Q15. 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
Show Answer
Answer:
(D) None of these
Civil Engineering MCQs with
Answers Concrete Technology – Set 08
Q6. 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
Show Answer
Answer:
(C) Directly proportional to square root of compressive strength
Q7. 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 color of the cement is bluish
(C) By rubbing cement in between fingers, one should feed rough
(D) All the above
Show Answer
Answer:
(D) All the above
Q8. 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
Show Answer
Answer:
(C) 200 kg/cm2
Q9. Slump test is done for
(A)
Clay
(B) Sand
(C) Lime
(D) Concrete
Show Answer
Answer:
(D) Concrete
Q10. 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
Show Answer
Answer:
(D) 75 mm
Q11. 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
Show Answer
Answer:
(D) Siliceous, argillaceous and calcareous materials
Q12. Di-calcium silicate (C2S)
(A)
Hydrates rapidly
(B) Generates less heat of hydration
(C) Hardens rapidly
(D) Provides less ultimate strength to cement
Show Answer
Answer:
(A) Hydrates rapidly
Q13. In counterfort type retaining walls
(i) The vertical slab is designed as a continuous slab
(ii) The heel slab is designed as a continuous slab
(iii) The vertical slab is designed as a cantilever
(iv) The heel slab is designed as a cantilever
The correct answer is
(A)
(i) and (ii)
(B) (i)and(iv)
(C) (ii) and (iii)
(D) (iii) and (iv)
Show Answer
Answer:
(A) (i) and (ii)
Q14. 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
Show Answer
Answer:
(A) Higher initial setting time but lower final setting time
Q15. 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%
Show Answer
Answer:
(C) 0.8% to 6%
Concrete Technology
Objective Questions with Answer Key – Set 09
Q1. Workability of concrete mix with low
water cement ratio is determined by
(A)
Tensile strength test
(B) Slump test
(C) Compaction factor test
(D) Flexural strength test
Show Answer
Answer:
(C) Compaction factor test
Q2. 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
Show Answer
Answer:
(D) All the above
Q3. The risk of segregation is more for
(A)
Wetter mix
(B) Larger proportion of maximum size aggregate
(C) Coarser grading
(D) All the above
Show Answer
Answer:
(D) All the above
Q4. If the average compressive strength is
4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is
(A)
10 %
(B) 12.5 %
(C) 15 %
(D) 18.5 %
Show Answer
Answer:
(B) 12.5 %
Q5. 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
Show Answer
Answer:
(B) 0.3P + 0.1Y + 0.01Z = W/C × P
Q6. Le-Chatelier’s apparatus is used for
testing
(A)
Soundness of cement
(B) Hardness of cement
(C) Strength of cement
(D) Durability of cement
Show Answer
Answer:
(A) Soundness of cement
Q7. 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
Show Answer
Answer:
(B) To increase it
Q8. 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)
Show Answer
Answer:
(B) (i) and (iv)
Q9. According to Whitney’s theory, depth of
stress block for a balanced section of a concrete beam is limited to (Where d
is effective depth of beam).
(A)
0.43 d
(B) 0.537 d
(C) 0.68 d
(D) 0.85 d
Show Answer
Answer:
(B) 0.537 d
Q10. 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
Show Answer
Answer:
(A) Rounded aggregate
Q11. 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
Show Answer
Answer:
(C) 7.40
Q12. Construction joints are generally
provided in concrete
(A)
Roads
(B) Retaining walls
(C) Lining of canals
(D) All the above
Show Answer
Answer:
(D) All the above
Q13. The maximum percentage of chemical
ingredient of cement is that of
(A)
Magnesium oxide
(B) Iron oxide
(C) Silica
(D) Lime
Show Answer
Answer:
(D) Lime
Q14. 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
Show Answer
Answer:
(D) Swelling of sand when wetted
Q15. 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
Show Answer
Answer:
(D) All the above
Objective Questions
Concrete Technology and Design of Concrete Structures – Set 10
Q1. 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
Show Answer
Answer:
(A) Long line method
Q2. 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
Show Answer
Answer:
(A) Only in post-tensioned beams
Q3. 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
Show Answer
Answer:
(C) One end fixed and other end hinged
Q4. 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
Show Answer
Answer:
(A) Water cement ratio
Q5. 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
Show Answer
Answer:(D)
All the above
Q6. 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
Show Answer
Answer:
(D) 3000 bags
Q7. 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
Show Answer
Answer:
(D) All the above
Q8. 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
Show Answer
Answer:
(D) All the above
Q9. 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
Show Answer
Answer:
(D) Concrete ingredients should be kept at a temperature of 37° ± 2°C
Q10. 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
Show Answer
Answer:(B)
2.0
Q11. As compared to ordinary Portland
cement, use of pozzolana cement
(A)
Reduces workability
(B) Increases bleeding
(C) Increases shrinkage
(D) Increases strength
Show Answer
Answer:
(C) Increases shrinkage
Q12. 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
Show Answer
Answer:
(B) Tensile everywhere
Q13. 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 %
Show Answer
Answer:
(D) 25 %
Q14. 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
Show Answer
Answer:
(D) 1 : 4 : 10
Q15. 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)
Show Answer
Answer:
(D) Both (a) and (b)
Design of Concrete
Structures MCQ Practice Test – Set 11
Q1. 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
Show Answer
Answer:(C)
40.5 mm
Q2. 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
Show Answer
Answer:
(D) All the above
Q3. Log Angles machine is used to test the
aggregate for
(A)
Crushing strength
(B) Impact value
(C) Abrasion resistance
(D) Water absorption
Show Answer
Answer:
(C) Abrasion resistance
Q4. 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
Show Answer
Answer:
(C) The settlement of exterior columns will be more than interior columns
Q5. 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
Show Answer
Answer:
(B) Steel is lower than that for concrete
Q6. The property of the ingredients to separate
from each other while placing the concrete is called
(A)
Segregation
(B) Compaction
(C) Shrinkage
(D) Bulking
Show Answer
Answer:
(A) Segregation
Q7. Saw dust can be rendered chemically
inert by boiling it in water containing
(A)
Ferrous sulphate
(B) Potassium chloride
(C) Ammonia
(D) Nitric acid
Show Answer
Answer:
(A) Ferrous sulphate
Q8. 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
Show Answer
Answer:
(D) 15 kg/cm2
Q9. 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
Show Answer
Answer:
(D) All the above
Q10. A concrete having a slump of 6.5 cm,
is said to be
(A)
Dry
(B) Earth moist
(C) Semi-plastic
(D) Plastic
Show Answer
Answer:
(D) Plastic
Q11. Setting time of cement increases by
adding
(A)
Gypsum
(B) Hydrogen peroxide
(C) Calcium chloride
(D) Sodium oxide
Show Answer
Answer:(A)
Gypsum
Q12. 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
Show Answer
Answer:
(A) 30 minutes
Q13. 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)
Show Answer
Answer:
(A) (i) and (ii)
Q14. According to IS: 4561978, the maximum
reinforcement in a column is
(A)
2 %
(B) 4 %
(C) 6 %
(D) 8 %
Show Answer
Answer:
(C) 6 %
Q15. 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
Show Answer
Answer:
(C) 20 to 25% more
Concrete Technology MCQ pdf
– Set 12
Show Answer
Answer:(B)
0.40 d
Q10. 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
Show Answer
Answer:
(A) Rounded spherical
Q11. 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
Show Answer
Answer:
(D) The mould is in the form of a frustum of hexagonal pyramid
Q12. 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
Show Answer
Answer:
(D) All the above
Q13. 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
Show Answer
Answer:
(D) All the above
Q14. The concrete mix which causes
difficulty in obtaining a smooth finish, possess
(A)
Segregation
(B) Internal friction
(C) Hardness
(D) Bleeding
Show Answer
Answer:
(C) Hardness
Q15. Sand generally contains salt if it is
obtained from:
(A)
Nala beds
(B) River beds
(C) Sea beds
(D) None of these
Show Answer
Answer:
(C) Sea beds
Concrete Technology MCQs
with Answers – Set 13
Q1. 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
Show Answer
Answer:
(A) Less than 12
Q2. 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)
Show Answer
Answer:
(B) (i) and (iv)
Q3. 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
Show Answer
Answer:
(A) 3.5 m
Q4. 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
Show Answer
Answer:
(D) Both (a) and (b) of the above
Q5. 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
Show Answer
Answer:(B)
Decreases the strength of concrete
Q6. 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
Show Answer
Answer:
(D) Size and shape of the container
Q7. 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
Show Answer
Answer:
(C) 14 kg
Q8. Horizontal construction joints in
concrete walls are generally provided at
(A)
Soffit level
(B) Window sill level
(C) Floor level
(D) All the above
Show Answer
Answer:
(D) All the above
Q9. 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
Show Answer
Answer:
(D) 28 days
Q10. Half of the main steel in a simply
supported slab is bent up near the support at a distance of ‘x’ from the center
of slab bearing where ‘x’ is equal to (Where ‘l’ is the span)
(A)
l/3
(B) l/5
(C) l/7
(D) l/10
Show Answer
Answer:
(C) l/7
Q11. 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
Show Answer
Answer:(C)
Does not show definite yield point but yield point is defined by 0.2% proof
stress
Q12. 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
Show Answer
Answer:
(B) Lower compressive strength of concrete
Q13. 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
Show Answer
Answer:
(C) In single size aggregates, bulk density is maximum
Q14. Addition of pozzolana to cement causes
(A)
Reduction in permeability
(B) Loss of heat of hydration
(C) Reduction in bleeding
(D) All the above
Show Answer
Answer:
(D) All the above
Q15. 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
Show Answer
Answer:
(D) 10 mm
Concrete Technology
Important MCQs – Set 14
Q1. To prevent segregation, the maximum
height for placing concrete, is
(A)
100 cm
(B) 125 cm
(C) 150 cm
(D) 200 cm
Show Answer
Answer:
(A) 100 cm
Q2. 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
Show Answer
Answer:
(C) 200 kg/cm2
Q3. 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
Show Answer
Answer:
(D) All the above
Q4. 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
Show Answer
Answer:
(B) 750 mm
Q5. The minimum diameter of longitudinal
bars in a column is
(A)
6 mm
(B) 8 mm
(C) 12 mm
(D) 16 mm
Show Answer
Answer:
(C) 12 mm
Q6. 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
Show Answer
Answer:
(A) Top face perpendicular to wall
Q7. 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
Show Answer
Answer:
(B) Screed vibrator
Q8. 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
Show Answer
Answer:
(C) Increased lime cement
Q9. Separation of coarse aggregates from
mortar during transportation, is known
(A)
Bleeding
(B) Creeping
(C) Segregation
(D) Shrinkage
Show Answer
Answer:
(C) Segregation
Q10. Expansion joints are provided if the
length of concrete structures exceeds
(A)
10 m
(B) 15 m
(C) 25 m
(D) 45 m
Show Answer
Answer:
(D) 45 m
Q11. Sand requiring a high water cement
ratio, belongs to
(A)
Zone I
(B) Zone II
(C) Zone III
(D) Zone IV
Show Answer
Answer:
(A) Zone I
Q12. 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
Show Answer
Answer:
(B) Twice the mean size
Q13. 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
Show Answer
Answer:
(A) About 0.1 N/mm²
Q14. 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
Show Answer
Answer:
(A) M 15
Q15. 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
Show Answer
Answer:
(A) Both A and R is true and R is the correct explanation of A
Concrete Technology and RCC
Design MCQ – Set 15
Q1. 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
Show Answer
Answer:
(D) All the above
Q2. 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
Show Answer
Answer:
(B) 5.0 cm
Q3. 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
Show Answer
Answer:
(C) Low heat cement
Q4. 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
Show Answer
Answer:
(D) All the above
Q5. Non-uniform compaction may cause the
concrete
(A)
Porous
(B) Non-homogeneous
(C) Reduced strength
(D) All the above
Show Answer
Answer:
(D) All the above
Q6. 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
Show Answer
Answer:
(D) All the above
Q7. 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
Show Answer
Answer:
(C) Halfway between the middle and edge of the wall
Q8. Modulus of rupture of concrete is a
measure of
(A)
Flexural tensile strength
(B) Direct tensile strength
(C) Compressive strength
(D) Split tensile strength
Show Answer
Answer:
(A) Flexural tensile strength
Q9. Normally pre-stressing wires are
arranged in the
(A)
Upper part of the beam
(B) Lower part of the beam
(C) Center
(D) Anywhere
Show Answer
Answer:
(B) Lower part of the beam
Q10. Separation of water or water sand
cement from a freshly concrete, is known
(A)
Bleeding
(B) Creeping
(C) Segregation
(D) Flooding
Show Answer
Answer:
(A) Bleeding
Q11. 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
Show Answer
Answer:
(A) 1 : 3 : 6 mix
Q12. 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
Show Answer
Answer:(D)
All the above
Q13. 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
Show Answer
Answer:
(A) A horizontal line
Q14. 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
Show Answer
Answer:
(D) Thick and heavily reinforced
Q15. The minimum percentage of chemical
ingredient of cement is that of
(A)
Magnesium oxide
(B) Iron oxide
(C) Alumina
(D) Lime
Show Answer
Answer:
(A) Magnesium oxide
RCC Design & Concrete
Technology Objective Questions – Set 16
Q1. Poisson’s ratio for concrete
(A)
Remains constant
(B) Increases with richer mixes
(C) Decreases with richer mixes
(D) None of the above
Show Answer
Answer:
(B) Increases with richer mixes
Q2. 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
Show Answer
Answer:
(C) 25 mm
Q3. 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
Show Answer
Answer:
(B) 150 mm
Q4. 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
Show Answer
Answer:
(D) All the above
Q5. 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
Show Answer
Answer:
(D) All the above
Q6. 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
Show Answer
Answer:
(D) All the above
Q7. 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
Show Answer
Answer:
B) 7 days
Q8. Sands of zone-I are:
(A)
Course
(B) Medium
(C) Medium to fine
(D) Fine
Show Answer
Answer:
(A) Course
Q9. 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
Show Answer
Answer:
(D) All the above
Q10. 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
Show Answer
Answer:
(B) 0.5
Q11. According to Whitney’s theory,
ultimate strain of concrete is assumed to be
(A)
0.03 %
(B) 0.1 %
(C) 0.3 %
(D) 3 %
Show Answer
Answer:
(C) 0.3 %
Q12. The design yield stress of steel
according to IS: 4561978 is:
(Where fy is the characteristic yield strength of steel)
(A)
0.37 fy
(B) 0.57 fy
(C) 0.67 fy
(D) 0.87 fy
Show Answer
Answer:
(D) 0.87 fy
Q13. 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
Show Answer
Answer:
(C) 3/5th of mean dimension
Q14. 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
Show Answer
Answer:
(B) Concrete specimens may be tested at any temperature
Q15. The process of hardening the concrete
by keeping its surface moist is known
(A)
Placing
(B) Wetting
(C) Curing
(D) Compacting
Show Answer
Answer:
(C) Curing
Concrete Technology
Objective Questions with Answers pdf – Set 17
Show Answer
Answer:
(A) Time of transit
Q5. 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
Show Answer
Answer:
(B) 42 MPa and 35 MPa
Q6. 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
Show Answer
Answer:
(D) Only (iv) is correct
Q7. 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)
Show Answer
Answer:
(D) Both (a) and (b)
Q8. 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
Show Answer
Answer:
(D) All the above
Q9. 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
Show Answer
Answer:
(D) All the above
Q10. Inert material of a cement concrete
mix, is
(A)
Water
(B) Cement
(C) Aggregate
(D) None of these
Show Answer
Answer:
(C) Aggregate
Q11. According to IS : 382-1963, a good
aggregate should be
(A)
Chemically inert
(B) Sufficiently strong
(C) Hard and durable
(D) All the above
Show Answer
Answer:(D)
All the above
Q12. Pozzolanic properties exist in
(A)
Shales
(B) Fly ash
(C) Pumicite
(D) All the above
Show Answer
Answer:
(D) All the above
Q13. 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
Show Answer
Answer:
(B) Using thinner bars but more in number
Q14. 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
Show Answer
Answer:
(B) More
Q15. 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
Show Answer
Answer:
(C) 2.5
Concrete Technology
Objective Type Questions and Answers – Set 18
Q1. 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
Show Answer
Answer:
(A) A rich mix of concrete possesses higher strength than that a lean mix of
desired workability with excessive quantity of water
Q2. 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
Show Answer
Answer:
(C) 40 mm to 50 mm
Q3. 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 liters
(C) 20 bags of cement make one tonne
(D) All the above
Show Answer
Answer:
(D) All the above
Q4. Ordinary Portland cement is
manufactured from
(A)
Lime stone and clay
(B) Gypsum and lime
(C) Pozzolana
(D) Lime, pozzolana and clay
Show Answer
Answer:(B)
Gypsum and lime
Q5. Gypsum is added for
(A)
Color
(B) Strength
(C) Controlling setting time
(D) None of these
Show Answer
Answer:
(C) Controlling setting time
Q6. 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
Show Answer
Answer:
(B) Fine sand
Q7. 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
Show Answer
Answer:
(B) 0.12
Q8. 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
Show Answer
Answer:
(B) 0.12
Q9. 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
Show Answer
Answer:
(C) 32 liters
Q10. Addition of pozzolana to cement
(A)
Decreases workability
(B) Increases strength
(C) Increases heat of hydration
(D) None of these
Show Answer
Answer:
(D) None of these
Q11. 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
Show Answer
Answer:
(B) 150 kg/cm2
Q12. 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
Show Answer
Answer:
(A) Less liable to segregation
Q13. 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
Show Answer
Answer:
(C) 12 kg
Q14. The cement becomes useless if its
absorbed moisture content exceeds
(A)
1 %
(B) 2 %
(C) 3 %
(D) 5 %
Show Answer
Answer:
(D) 5 %
Q15. Concrete is unsuitable for compaction
by a vibrator if it is
(A)
Dry
(B) Earth moist
(C) Semi-plastic
(D) Plastic
Show Answer
Answer:
(D) Plastic
Design of Concrete Structures
MCQ – Set 19
Q1. 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
Show Answer
Answer:
(A) Rounded
Q2. Proper proportioning of concrete,
ensures
(A)
Desired strength and workability
(B) Desired durability
(C) Water tightness of the structure
(D) All the above
Show Answer
Answer:
(D) All the above
Q3. For ensuring quality of concrete, use
(A)
Single sized aggregates
(B) Two sized aggregate
(C) Graded aggregates
(D) Coarse aggregates
Show Answer
Answer:
(C) Graded aggregates
Q4. In case of hand mixing of concrete, the
extra cement to be added is
(A)
5 %
(B) 10 %
(C) 15 %
(D) 20 %
Show Answer
Answer:
(B) 10 %
Q5. The maximum thickness of concrete floor
of a cement warehouse, is
(A)
10 cm
(B) 15 cm
(C) 20 cm
(D) 25 cm
Show Answer
Answer:
(D) 25 cm
Q6. 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
Show Answer
Answer:
(D) All the above
Q7. 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
Show Answer
Answer:
(B) fcr > fcs > fcl
Q8. 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 %
Show Answer
Answer:
(D) 40 %
Q9. If 1500 g of water is required to have
a cement paste 1875 g of normal consistency, the percentage of water is,
(A)
20 %
(B) 25 %
(C) 30 %
(D) 35 %
Show Answer
Answer:
(B) 25 %
Q10. Too wet concrete may cause
(A)
Weakness of concrete
(B) Excessive laitance
(C) Segregation
(D) All the above
Show Answer
Answer:
(D) All the above
Q11. 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
Show Answer
Answer:
(D) 13.5 mm
Q12. 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
Show Answer
Answer:
(D) High
Q13. Workability improved by adding
(A)
Air-entraining agent
(B) Foaming agent
(C) Oily-agent
(D) All the above
Show Answer
Answer:(D)
All the above
Q14. The percentage of voids in cement is
approximately
(A)
25 %
(B) 40 %
(C) 60 %
(D) 80 %
Show Answer
Answer:
(B) 40 %
Q15. Maximum percentage reinforcement in
case of slabs is limited to
(A)
2
(B) 4
(C) 6
(D) 8
Show Answer
Answer:
(B) 4
Concrete Technology and
Design Exam Quiz Questions – Set 20
Q1. Approximate value of shrinkage strain
in concrete, is
(A)
0.003
(B) 0.0003
(C) 0.00003
(D) 0.03
Show Answer
Answer:
(B) 0.0003
Q2. Air entrainment in the concrete
increases
(A)
Workability
(B) Strength
(C) The effects of temperature variations
(D) The unit weight
Show Answer
Answer:
(A) Workability
Q3. The maximum value of hoop compression
in a dome is given by
(Where, w = load per unit area of surface of dome R = radius of curvature d =
thickness of dome)
(A)
wR/4d
(B) wR/2d
(C) wR/d
(D) 2wR/d
Show Answer
Answer:
(B) wR/2d
Q4. Water required per bag of cement, is
(A)
7 kg
(B) 14 kg
(C) 21 kg
(D) 35 kg
Show Answer
Answer:
(D) 35 kg
Q5. The commonly used material in the
manufacture of cement is
(A)
Sand stone
(B) Slate
(C) Lime stone
(D) Graphite
Show Answer
Answer:(C)
Lime stone
Q6. For quality control of Portland cement,
the test essentially done is
(A)
Setting time
(B) Tensile strength
(C) Consistency
(D) All the above
Show Answer
Answer:
(D) All the above
Q7. 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
Show Answer
Answer:(D)
All the above
Q8. The rock which is not calcareous, is:
(A)
Lime stone
(B) Chalk
(C) Laterite
(D) None of these
Show Answer
Answer:
(D) None of these
Q9. The recommended value of modular ratio
for reinforced brick work is
(A)
18
(B) 30
(C) 40
(D) 58
Show Answer
Answer:
(C) 40
Q10. According to I.S. : 456, the number of
grades of concrete mixes, is
(A)
3
(B) 4
(C) 5
(D) 7
Show Answer
Answer:
(D) 7
Q11. Strength of concrete with passage of
time
(A)
Increases
(B) Decreases
(C) Fluctuates
(D) Remains constant
Show Answer
Answer:
(A) Increases
Q12. Strength of concrete with passage of
time
(A)
Increases
(B) Decreases
(C) Fluctuates
(D) Remains constant
Show Answer
Answer:
(A) Increases
Q13. A T-shaped retaining wall mainly
consists of
(A)
One cantilever
(B) Two cantilevers
(C) Three cantilevers
(D) Four cantilevers
Show Answer
Answer:
(C) Three cantilevers
Q14. For an ordinary Portland cement
(A)
Residual does not exceed 10% when sieved through IS Sieve No. 9
(B) Soundness varies from 5 to 10 mm
(C) Initial setting time is not less than 30 minutes
(D) Compressive stress after 7 days, is not less than 175 kg/cm2
Show Answer
Answer:
(C) Initial setting time is not less than 30 minutes
Q15. Grading of sand causes great variation
in
(A)
Workability of concrete
(B) Strength of concrete
(C) Durability of concrete
(D) All the above
Show Answer
Answer:
(D) All the above
Concrete Technology and
Design Exam Questions – Set 21
Show Answer
Answer:
(D) 1400° and 1500°C
Q7. 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
Show Answer
Answer:
(C) Compressive
Q8. 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
Show Answer
Answer:
(A) 2.0 to 3.5
Q9. Pozzolana cement is used with
confidence for construction of
(A)
Dams
(B) Massive foundations
(C) R.C.C. structures
(D) All the above
Show Answer
Answer:(D)
All the above
Q10. The ratio of various ingredients
(cement, sand, aggregates) in concrete of grade M 200, is
(A)
1 : 2 : 4
(B) 1 : 3 : 6
(C) 1 : 1½ : 3
(D) 1 : 1 : 2
Show Answer
Answer:
(C) 1 : 1½ : 3
Q11. In a pile of length ‘l’, 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
Show Answer
Answer:
(A) 0.207 l
Q12. 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
Show Answer
Answer:
(C) 3/5 mean dimension
Q13. After casting, an ordinary cement
concrete on drying
(A)
Expands
(B) Mix
(C) Shrinks
(D) None of these
Show Answer
Answer:
(C) Shrinks
Q14. Pick up the correct statement from the
following:
(A)
Calcium chloride acts as a retarder
(B) Calcium chloride acts as an accelerator
(C) Gypsum (calcium sulphate) acts as a retarder
(D) Both (b) and (c)
Show Answer
Answer:
(D) Both (b) and (c)
Q15. Joints in concrete structures, are
provided
(A)
To reduce the tensile stresses likely to be developed due to evaporation of
water
(B) To minimize the change in the dimensions of the slab
(C) To minimize the necessary cracking
(D) All the above
Show Answer
Answer:
(D) All the above
Concrete Structures
Questions and Answers pdf – Set 22
Q1. Curing a concrete for long period
ensures better
(A)
Volume stability
(B) Strength
(C) Water resistance
(D) All the above
Show Answer
Answer:
(D) All the above
Q2. 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)
Show Answer
Answer:
(D) All (i), (ii) and (iii)
Q3. The most commonly used admixture which
prolongs the setting and hardening time is
(A)
Gypsum
(B) Calcium chloride
(C) Sodium silicate
(D) All of the above
Show Answer
Answer:
(A) Gypsum
Q4. The operation of removing humps and
hollows of uniform concrete surface, is known as
(A)
Floating
(B) Screeding
(C) Trowelling
(D) Finishing
Show Answer
Answer:
(B) Screeding
Q5. For the construction of R.C.C. slabs,
columns, beams, walls, etc. the grade of concrete mix used, is
(A)
1 : 3 : 6
(B) 1 : 1½ : 3
(C) 1 : 2 : 4
(D) 1 : 1 : 2
Show Answer
Answer:
(C) 1 : 2 : 4
Q6. 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)
Show Answer
Answer:(A)
(i) and (iii)
Q7. Minimum thickness of load bearing RCC
wall should be
(A)
50 mm
(B) 100 mm
(C) 150 mm
(D) 200 mm
Show Answer
Answer:
(B) 100 mm
Q8. For given water content, workability
decreases if the concrete aggregates contain an excess of
(A)
Thin particles
(B) Flat particles
(C) Elongated particles
(D) All the above
Show Answer
Answer:(D)
All the above
Q9. 1% of voids in a concrete mix would
reduce its strength by about
(A)
5 %
(B) 10 %
(C) 15 %
(D) 20 %
Show Answer
Answer:(A)
5 %
Q10. Pick up the correct statement from the
following:
(A)
Water enables chemical reaction to take place with cement
(B) Water lubricates the mixture of gravel, sand and cement
(C) Strength of concrete structure largely depends upon its workability
(D) All the above
Show Answer
Answer:
(D) All the above
Q11. Batching error means inaccuracy in the
quantity of
(A)
Aggregates
(B) Cement
(C) Water
(D) All the above
Show Answer
Answer:
(D) All the above
Q12. 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
Show Answer
Answer:
(B) 1 : 1 : 2 mix
Q13. During erection, the pile of length
‘l’ is supported by a crane at a distance of
(A)
0.207 l
(B) 0.293 l
(C) 0.707 l
(D) 0.793 l
From the driving end of pile which rests on the ground
Show Answer
Answer:
(C) 0.707 l
Q14. 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
Show Answer
Answer:
(C) 200 kg/cm2
Q15. The final operation of finishing
floors, is known as
(A)
Screeding
(B) Floating
(C) Trowelling
(D) Finishing
Show Answer
Answer:
(C) Trowelling
Concrete Technology and
Design Objective Type Questions SET -23
Q1. 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
Show Answer
Answer:
(B) 10
Q2. 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)
Show Answer
(B)
(i) and (iv)
Q3. The process of proper and accurate
measurement of concrete ingredients for uniformity of proportion, is known
(A)
Grading
(B) Curing
(C) Mixing
(D) Batching
Show Answer
Answer:(D)
Batching
Q4. For a continuous slab of 3 m × 3.5 m
size, the minimum overall depth of slab to satisfy vertical deflection limits
is
(A)
50 mm
(B) 75 mm
(C) 100 mm
(D) 120 mm
Show Answer
Answer:
(B) 75 mm
Q5. Transport of concrete by pumps, is done
for a distance of
(A)
100 m
(B) 200 m
(C) 300 m
(D) 400 m
Show Answer
Answer:(D)
400 m
Q6. 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
Show Answer
Answer:
(B) P = [(X – Z)/(Z – Y)] × 100
Q7. 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
Show Answer
Answer:
(D) 300 kg/cm2
Q8. The load factors for live load and dead
load are taken respectively as
(A)
1.5 and 2.2
(B) 2.2 and 1.5
(C) 1.5 and 1.5
(D) 2.2 and 2.2
Show Answer
Answer:
(B) 2.2 and 1.5
Q9. The most useless aggregate is one whose
surface texture is
(A)
Smooth
(B) Granular
(C) Glassy
(D) Honey combed and porous
Show Answer
Answer:
(C) Glassy
Q10. Curing
(A)
Reduces the shrinkage of concrete
(B) Preserves the properties of concrete
(C) Prevents the loss of water by evaporation
(D) All of the above
Show Answer
Answer:
(D) All of the above
Q11. 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
Show Answer
Answer:
(C) Over-reinforced beam
Q12. 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
Show Answer
Answer:
(B) Increase in fineness of cement
Q13. The mixture of different ingredients
of cement, is burnt at
(A)
1000°C
(B) 1200°C
(C) 1400°C
(D) 1600°C
Show Answer
Answer:
(C) 1400°C
Q14. The shrinkage of concrete
(A)
Is proportional to water content is the mix
(B) Is proportional to cement concrete
(C) Increases with age of concrete
(D) All the above
Show Answer
Answer:
(D) All the above
Q15. The datum temperature for maturity by
Plowman, is
(A)
23°C
(B) 0°
(C) – 5.6°C
(D) – 11.7°C
Show Answer
Answer:
(D) – 11.7°C
Great collection of content, its really helpful....
ReplyDelete