Concrete Technology MCQ Questions PDF
concrete technology mcq questions pdf concrete technology mcq diploma pdf advanced concrete technology mcq concrete technology mcq civil engineering advanced concrete technology mcq pdf download concrete technology question bank
1. 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
Answer: Option B
2. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then
A. there will be no settlement of columns
B. there will be no differential settlement
C. the settlement of exterior columns will be more than interior columns
D. the settlement of interior columns will be more than exterior columns
Answer: Option C
3. 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
Answer: Option C
4. Poisson’s ratio for concrete
A. remains constant
B. increases with richer mixes
C. decreases with richer mixes
D. none of the above
Answer: Option B
5. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than
A. 35 MPa and 42 MPa
B. 42 MPa and 35 MPa
C. 42 MPa and 53 MPa
D. 53 MPa and 42 MPa
Answer: Option B
6. 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
Answer: Option B
7. 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
Answer: Option A
8. The minimum cover to the ties or spirals should not be less than
A. 15 mm
B. 20 mm
C. 25 mm
D. 50mm
Answer: Option C
9. For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be
A. 600 mm
B. 750 mm
C. 900 mm
D. more than 1 m
Answer: Option D
10. Select the incorrect statement
A. Lean mixes bleed more as compared to rich ones.
B. Bleeding can be minimized by adding pozzuolana finer aggregate.
C. Bleeding can be increased by addition of calcium chloride.
D. none of the above
Answer: Option D
11. Workability of concrete is inversely proportional to
A. time of transit
B. vater-cement ratio
C. the air in the mix
D. size of aggregate
Answer: Option A
12. If a beam fails in bond, then its bond strength can be increased most economi-cally by
A. increasing the depth of beam
B. using thinner bars but more in number
C. using thicker bars but less in number
D. providing vertical stirrups
Answer: Option B
13. 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
Answer: Option D
14. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than
A. 0.15
B. 0.12
C. 0.30
D. 1.00
Answer: Option B
15. Bulking of sand is maximum if moisture content is about
A. 2 %
B. 4 %
C. 6 %
D. 10 %
Answer: Option B
16. The permissible diagonal tensile stress in reinforced brick work is
A. about 0.1 N/mm²
B. zero
C. 0.3 N/mm² to 0.7 N/mm²
D. about 1.0 N/mm²
Answer: Option A
17. To determine the modulus of rupture, the size of test specimen used is
A. 150 x150 x500 mm
B. 100 x100 x700 mm
C. 150 x150 x700 mm
D. 100 x100 x500 mm
Answer: Option C
18. Select the incorrect statement
A. The loss of prestress is more in pre-tensioning system than in post-tensioning system.
B. Pretensioning system has greater certainty about its durability.
C. For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system
D. none of the above
Answer: Option D
19. 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: Option B
20. 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
Answer: Option B
Concrete Technology MCQ Questions PDF
21. A T-shaped retaining wall mainly consists of
A. one cantilever
B. two cantilevers
C. three cantilevers
D. four cantilevers
Answer: Option C
22. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by
A. 10%
B. 20%
C. 30%
D. 40%
Answer: Option D
23. The depth of footing for an isolated column is governed by
i) maximum bending moment
ii) shear force
A. only (i)
B. (i) and (ii)
C. (i) and (iii)
D. (i), (ii) and (iii)
Answer: Option D
24. 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: Option A
25. 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
26. The correct answer is
Save for Later
A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (ii) and (iv)
Answer: Option A
27. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
A. 100 mm
B. 150 mm
C. 200 mm
D. 250 mm
Answer: Option B
28. According to IS : 456- 1978, minimum slenderness ratio for a short column is
A. less than 12
B. less than 18
C. between 18 and 24
D. more than 24
Answer: Option A
29. 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
Answer: Option D
30. 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: Option A
31. 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
Answer: Option B
32. The effect of creep on modular ratio is
A. to decrease it
B. to increase it
C. either to decrease or to increase it
D. to keep it unchanged
Answer: Option B
33. 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
Answer: Option A
34. 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
Answer: Option B
35. Sinking of an intermediate support of a continuous beam
i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at center of span
iv) increases the positive moment at center of span
The correct answer is
A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (ii) and (iv)
Answer: Option B
36. If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are
A. 3.0 m and 1.5 m
B. 1.5 m and 3.0 m
C. 3.0 m and 3.0 m
D. 1.5 m and 1.5 m
Answer: Option C
37. 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 paralleUo the wall
iv) bottom face perpendicular to the wall
A. only (ii) is correct
B. (i) and (ii) are correct
C. (iii) and (iv) are correct
D. only (iv) is correct
Answer: Option D
38. 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)
Answer: Option A
39. Minimum thickness of load bearing RCC wall should be
A. 50 mm
B. 100 mm
C. 150 mm
D. 200 mm
Answer: Option B
40. A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than
A. 1.5
B. 2.0
C. 2.5
D. 3.0
Answer: Option C
Concrete Technology MCQ Questions PDF
41. According to Whitney’s theory, ultimate strain of concrete is assumed to be
A. 0.03%
B. 0.1%
C. 0.3%
D. 3%
Answer: Option C
42. In a spherical dome the hoop stress due to a concentrated load at crown is
A. compressive everywhere
B. tensile everywhere
C. partly compressive and partly tensile
D. zero
Answer: Option B
43. 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: Option B
44. 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
Answer: Option D
45. The percentage of voids in cement is approximately
A. 25%
B. 40%
C. 60%
D. 80%
Answer: Option B
46. If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section
A. depends on as, only
B. depends on aCbC only
C. depends on both crst and acbc
D. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
Answer: Option A
47. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than
A. 15 mm
B. 25 mm
C. 30 mm
D. 40 mm
Answer: Option D
48. 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)
Answer: Option C
49. The recommended value of modular ratio for reinforced brick work is
A. 18
B. 30
C. 40
D. 58
Answer: Option C
50. Shrinkage of concrete depends upon
i) humidity of atmosphere
ii) passage of time
iii) stress
The correct answer is
A. (i) and (ii)
B. (ii) and (iii)
C. only (iii)
D. All (i), (ii) and (iii)
Answer: Option A
Posts
0 Comments
Give ur Valuble suggestion in the Comment box