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Concrete Technology and Design MCQ Solved Paper for UPSC CDS

Thursday 9th of March 2023

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1. The high strength of rapid hardening cement at early stage, is due to its
A. Finer grinding
B. Burning at high temperature
C. Increased lime cement
D. Higher content of tricalcium
Answer : C
2. Poisson's ratio for concrete
A. Remains constant
B. Increases with richer mixes
C. Decreases with richer mixes
D. None of the above
Answer : B
3. For ensuring quality of concrete, use
A. Single sized aggregates
B. Two sized aggregate
C. Graded aggregates
D. Coarse aggregates
Answer : C
4. For quality control of Portland cement, the test essentially done is
A. Setting time
B. Tensile strength
C. Consistency
D. All the above
Answer : D
5. 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
Answer : C
6. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between
A. 1100° and 1200°C
B. 1200° and 1300°C
C. 1300° and 1400°C
D. 1400° and 1500°C
Answer : D
7. For the design of retaining walls, the minimum factor of safety against overturning is taken as
A. 1.5
B. 2.0
C. 2.5
D. 3.0
Answer : B
8. 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
9. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then
A. There will be no settlement of columns
B. There will be no differential settlement
C. The settlement of exterior columns will be more than interior columns
D. The settlement of interior columns will be more than exterior columns
Answer : C
10. The maximum percentage of chemical ingredient of cement is that of
A. Magnesium oxide
B. Iron oxide
C. Silica
D. Lime
Answer : D
11. 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
Answer : D
12. Shrinkage in concrete can be reduced by using
A. Low water cement ratio
B. Less cement in the concrete
C. Proper concrete mix
D. All the above
Answer : D
13. The concrete mix which causes difficulty in obtaining a smooth finish, possess
A. Segregation
B. Internal friction
C. Hardness
D. Bleeding
Answer : C
14. After casting, an ordinary cement concrete on drying
A. Expands
B. Mix
C. Shrinks
D. None of these
Answer : C
15. For the construction of the retaining structures, the type of concrete mix to be used, is
A. 1 : 3 : 6
B. 1 : 2 : 4
C. 1 : 1 ½ : 3
D. 1 : 4 : 8
Answer : C
16. Pick up the correct statement from the following:
A. Bulking of sand is caused due to formation of a thin film of surface moisture
B. Fine sand bulks more than coarse sand
C. The volume of fully saturated sand, is equal to the volume of dry and loose sand
D. All the above
Answer : D
17. 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
Answer : B
18. The minimum percentage of chemical ingredient of cement is that of
A. Magnesium oxide
B. Iron oxide
C. Alumina
D. Lime
Answer : A
19. 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
Answer : A
20. Workability of concrete is directly proportional to
A. Aggregate cement ratio
B. Time of transit
C. Grading of the aggregate
D. All of above
Answer : C
21. 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
22. The mixture of different ingredients of cement, is burnt at
A. 1000°C
B. 1200°C
C. 1400°C
D. 1600°C
Answer : C
23. The ratio of the length to breadth of a wooden float, is
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Answer : D
24. As compared to ordinary Portland cement, use of pozzolana cement
A. Reduces workability
B. Increases bleeding
C. Increases shrinkage
D. Increases strength
Answer : C
25. 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
Answer : D
26. The operation of removing humps and hollows of uniform concrete surface, is known as
A. Floating
B. Screeding
C. Trowelling
D. Finishing
Answer : B
27. To obtain a very high strength concrete, use very fine grained
A. Granite
B. Magnetite
C. Barite
D. Volcanic scoria
Answer : A
28. Specified compressive strength of concrete is obtained from cube tests at the end of
A. 3 days
B. 7 days
C. 21 days
D. 28 days
Answer : D
29. Bulking of sand is
A. Mixing of different sizes of sand particles
B. Mixing of lime with sand
C. Maximum water with sand
D. Swelling of sand when wetted
Answer : D
30. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
A. Zero
B. Tensile
C. Compressive
D. Tensile or compressive
Answer : C
31. 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
Answer : D
32. Pick up the correct statement from the following:
A. High percentage of C3S and low percentage of C2S cause rapid hardening
B. High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
C. Low percentage of C3S and high percentage of C2S contribute to slow hardening
D. All the above
Answer : D
33. The dimensions of a 35 litre 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
Answer : C
34. The entrained air in concrete
A. Increases workability
B. Decreases workability
C. Decreases resistance to weathering
D. Increases strength
Answer : A
35. Pick up the correct statement from the following:
A. Insufficient quantity of water makes the concrete mix harsh
B. Insufficient quantity of water makes the concrete unworkable
C. Excess quantity of water makes the concrete segregated
D. All the above
Answer : D
36. The final operation of finishing floors, is known as
A. Screeding
B. Floating
C. Trowelling
D. Finishing
Answer : C
37. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
A. 30 minutes
B. 40 minutes
C. 60 minutes
D. 90 minutes
Answer : A
38. 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
39. Sand requiring a high water cement ratio, belongs to
A. Zone I
B. Zone II
C. Zone III
D. Zone IV
Answer : A
40. The permissible diagonal tensile stress in reinforced brick work is
A. About 0.1 N/mm²
B. Zero
C. 0.3 N/mm² to 0.7 N/mm²
D. About 1.0 N/mm²
Answer : A
41. Examine the following statements: (i) Factor of safety for steel should be based on its yield stress, (ii) Factor of safety for steel should be based on its ultimate stress, (iii) Factor of safety for concrete should be based on its yield stress, (iv) Factor of safety for concrete should be based on its ultimate stress. The correct statements are
A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (ii) and (iv)
Answer : B
42. Select the incorrect statement
A. Lean mixes bleed more as compared to rich ones.
B. Bleeding can be minimized by adding pozzolana finer aggregate
C. Bleeding can be increased by addition 'of calcium chloride
D. None of the above
Answer : D
43. Pick up the correct statement from the following:
A. The concrete gains strength due to hydration of cement
B. The concrete does not set at freezing point
C. The strength of concrete increases with its age
D. All the above
Answer : D
44. 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
Answer : D
45. How long will it take for the concrete to achieve 100% of its strength?
A. 7 days
B. 14 days
C. 21 days
D. 28 days
Answer : D
46. Horizontal construction joints in concrete walls are generally provided at
A. Soffit level
B. Window sill level
C. Floor level
D. All the above
Answer : D
47. Workability of concrete is inversely proportional to
A. Time of transit
B. Water-cement ratio
C. The air in the mix
D. Size of aggregate
Answer : A
48. Shrinkage of concrete depends upon
(i) Humidity of atmosphere
(ii) Passage of time
(iii) Stress The correct answer is
A. (i) and (ii)
B. (ii) and (iii)
C. Only (iii)
D. All (i), (ii) and (iii)
Answer : A
49. C.R.R.I. charts are used to obtain a relationship between strength of concrete and
A. Water cement ratio
B. Workability
C. Grading of aggregate
D. Fineness modulus
Answer : A
50. The factor of safety for
A. Steel and concrete are same
B. Steel is lower than that for concrete
C. Steel is higher than that for concrete
D. None of the above
Answer : B
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