Concrete Technology and Design MCQ Solved Paper for SSC CPO
Thursday 9th of March 2023
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1. Water required per bag of cement, is
A. 7 kg
B. 14 kg
C. 21 kg
D. 35 kg
Answer : D
A. 7 kg
B. 14 kg
C. 21 kg
D. 35 kg
Answer : D
2. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is
A. 30 %
B. 40 %
C. 50 %
D. 60 %
Answer : C
A. 30 %
B. 40 %
C. 50 %
D. 60 %
Answer : C
3. Curing a concrete for long period ensures better
A. Volume stability
B. Strength
C. Water resistance
D. All the above
Answer : D
A. Volume stability
B. Strength
C. Water resistance
D. All the above
Answer : D
4. Pozzolana cement is used with confidence for construction of
A. Dams
B. Massive foundations
C. R.C.C. structures
D. All the above
Answer : D
A. Dams
B. Massive foundations
C. R.C.C. structures
D. All the above
Answer : D
5. 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
Answer : C
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
Answer : C
6. 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 : A
A. M 15
B. M 20
C. M 10
D. M 25
Answer : A
7. 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
Answer : A
A. Gypsum
B. Calcium chloride
C. Sodium silicate
D. All of the above
Answer : A
8. 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 : D
A. Reduction in permeability
B. Loss of heat of hydration
C. Reduction in bleeding
D. All the above
Answer : D
9. 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 %
Answer : B
A. 10 %
B. 12.5 %
C. 15 %
D. 18.5 %
Answer : B
10. Sand generally contains salt if it is obtained from:
A. Nala beds
B. River beds
C. Sea beds
D. None of these
Answer : C
A. Nala beds
B. River beds
C. Sea beds
D. None of these
Answer : C
11. 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 : A
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 : A
12. 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
Answer : D
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
Answer : D
13. An ideal ware house, is provided
A. Water proof masonry walls
B. Water proof roof
C. Few windows which remain generally closed
D. All the above
Answer : D
A. Water proof masonry walls
B. Water proof roof
C. Few windows which remain generally closed
D. All the above
Answer : D
14. A concrete having a slump of 6.5 cm, is said to be
A. Dry
B. Earth moist
C. Semi-plastic
D. Plastic
Answer : D
A. Dry
B. Earth moist
C. Semi-plastic
D. Plastic
Answer : D
15. For ensuring quality of concrete, use
A. Single sized aggregates
B. Two sized aggregate
C. Graded aggregates
D. Coarse aggregates
Answer : C
A. Single sized aggregates
B. Two sized aggregate
C. Graded aggregates
D. Coarse aggregates
Answer : C
16. A higher modular ratio shows
A. Higher compressive strength of concrete
B. Lower compressive strength of concrete
C. Higher tensile strength of steel
D. Lower tensile strength of steel
Answer : B
A. Higher compressive strength of concrete
B. Lower compressive strength of concrete
C. Higher tensile strength of steel
D. Lower tensile strength of steel
Answer : B
17. The surface where two successive placements of concrete meet, is known as
A. Contraction joint
B. Expansion joint
C. Construction joint
D. Both (a) and (b)
Answer : C
A. Contraction joint
B. Expansion joint
C. Construction joint
D. Both (a) and (b)
Answer : C
18. 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
Answer : C
A. L-shaped wall
B. T-shaped wall
C. Counterfort type
D. All of the above
Answer : C
19. 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
Answer : A
A. Admixtures accelerate hydration
B. Admixtures make concrete water proof
C. Admixtures make concrete acid proof
D. Admixtures give high strength
Answer : A
20. The datum temperature for maturity by Plowman, is
A. 23°C
B. 0°
C. - 5.6°C
D. - 11.7°C
Answer : D
A. 23°C
B. 0°
C. - 5.6°C
D. - 11.7°C
Answer : D
21. 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 : D
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 : D
22. Pick up the incorrect statement from the following:
A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water
B. The strength of concrete decreases as the water cement ratio increases
C. Good compaction by mechanical vibrations, increases the strength of concrete
D. None of these
Answer : A
A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water
B. The strength of concrete decreases as the water cement ratio increases
C. Good compaction by mechanical vibrations, increases the strength of concrete
D. None of these
Answer : A
23. 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
Answer : B
A. 1.5 and 2.2
B. 2.2 and 1.5
C. 1.5 and 1.5
D. 2.2 and 2.2
Answer : B
24. 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
Answer : B
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
Answer : B
25. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is
A. 30 %
B. 40 %
C. 50 %
D. 60 %
Answer : A
A. 30 %
B. 40 %
C. 50 %
D. 60 %
Answer : A
26. 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 : C
A. 100 kg/cm2
B. 150 kg/cm2
C. 200 kg/cm2
D. 250 kg/cm2
Answer : C
27. 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
Answer : A
A. Is always less than 1
B. Is always greater than 1
C. Can be more than 1
D. Can be less than 1
Answer : A
28. The commonly used material in the manufacture of cement is
A. Sand stone
B. Slate
C. Lime stone
D. Graphite
Answer : C
A. Sand stone
B. Slate
C. Lime stone
D. Graphite
Answer : C
29. 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
Answer : D
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
Answer : D
30. 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
Answer : B
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
Answer : B
31. 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 : C
A. 0.15% to 2%
B. 0.8% to 4%
C. 0.8% to 6%
D. 0.8% to 8%
Answer : C
32. 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
Answer : A
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
Answer : A
33. If fineness modulus of sand is 2.5, it is graded as
A. Very fine sand
B. Fine sand
C. Medium sand
D. Coarse sand
Answer : B
A. Very fine sand
B. Fine sand
C. Medium sand
D. Coarse sand
Answer : B
34. 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
Answer : D
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
Answer : D
35. 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 : D
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 : D
36. The approximate value of the ratio between direct tensile strength and flexural strength is
A. 0.33
B. 0.5
C. 0.75
D. 1.0
Answer : B
A. 0.33
B. 0.5
C. 0.75
D. 1.0
Answer : B
37. 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 : D
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 : D
38. 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
Answer : B
A. Plain hot rolled wires
B. Cold drawn wires
C. Heat treated rolled wires
D. All have same tensile strength
Answer : B
39. 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
Answer : D
A. Thin particles
B. Flat particles
C. Elongated particles
D. All the above
Answer : D
40. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where xu is the depth of neutral axis at the limit state of collapse)
A. 0.367 xu
B. 0.416 xu
C. 0.446 xu
D. 0.573 xu
Answer : B
A. 0.367 xu
B. 0.416 xu
C. 0.446 xu
D. 0.573 xu
Answer : B
41. Which of the following losses of pre-stress occurs only in pretensioning and not in post-tensioning?
A. Elastic shortening of concrete
B. Shrinkage of concrete
C. Creep of concrete
D. Loss due to friction
Answer : A
A. Elastic shortening of concrete
B. Shrinkage of concrete
C. Creep of concrete
D. Loss due to friction
Answer : A
42. Select the incorrect statement
A. The loss of pre-stress is more in pre-tensioning system than in posttensioning system.
B. Pre-tensioning system has greater certainty about its durability.
C. For heavy loads and large spans in buildings or bridges, posttensioning system is cheaper than pre-tensioning system
D. None of the above
Answer : D
A. The loss of pre-stress is more in pre-tensioning system than in posttensioning system.
B. Pre-tensioning system has greater certainty about its durability.
C. For heavy loads and large spans in buildings or bridges, posttensioning system is cheaper than pre-tensioning system
D. None of the above
Answer : D
43. Gypsum is added for
A. Colour
B. Strength
C. Controlling setting time
D. None of these
Answer : C
A. Colour
B. Strength
C. Controlling setting time
D. None of these
Answer : C
44. Slump test of concrete is a measure of its
A. Consistency
B. Compressive strength
C. Tensile strength
D. Impact value
Answer : A
A. Consistency
B. Compressive strength
C. Tensile strength
D. Impact value
Answer : A
45. To hydrate 500kg of cement full water needed, is
A. 100 kg
B. 110 kg
C. 120 kg
D. 130 kg
Answer : D
A. 100 kg
B. 110 kg
C. 120 kg
D. 130 kg
Answer : D
46. While designing an air entrained concrete
A. Water cement ratio is reduced
B. Proportion of aggregates is reduced
C. An allowance for the entrained air is made
D. All the above
Answer : D
A. Water cement ratio is reduced
B. Proportion of aggregates is reduced
C. An allowance for the entrained air is made
D. All the above
Answer : D
47. Di-calcium silicate (C2S)
A. Hydrates rapidly
B. Generates less heat of hydration
C. Hardens rapidly
D. Provides less ultimate strength to cement
Answer : B
A. Hydrates rapidly
B. Generates less heat of hydration
C. Hardens rapidly
D. Provides less ultimate strength to cement
Answer : B
48. 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
Answer : D
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
Answer : D
49. 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
Answer : D
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
Answer : D
50. 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
Answer : A
A. 0.43 d
B. 0.55 d
C. 0.68 d
D. 0.85 d
Answer : A
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