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design of concrete structures MCQs

Practise focused design of concrete structures questions with marked answers for exam preparation and subject revision.

design of concrete structures Mcqs
1. Bulking of sand is maximum if moisture content is about____________?
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A. 10%

B. 4%

C. 2%

D. 6%

2. Which of the following R.C. retaining walls is suitable for heights beyond 6m ?
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A. counterfort type

B. all of the above

C. T-shaped wall

D. L-shaped wall

3. Strength of concrete increases with________________?
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A. decrease in curing time

B. increase in fineness of cement

C. decrease in size of aggregate

D. increase in water-cement ratio

4. Diagonal tension in a beam______________?
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A. decreases below the neutral axis and increases above the neutral axis

B. is maximum at neutral axis

C. increases below the neutral axis and decreases above the neutral axis

D. remains same

5. Which of the following statements is incorrect ?
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A. Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm

B. Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%

C. The number of longitudinal bars provided in a circular column should not be less than four

D. Reinforcing bars in a column should not be less than 12 mm in diameter

6. Due to circumferential action of the spiral in a spirally reinforced column________________?
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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
7. The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called________________?
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A. bleeding

B. segregation

C. creep

D. bulking

8. The compressive strength of 100 mm cube as compared to 150 mm cube is always_______________?
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A. more

B. none of the above

C. less

D. equal

9. Maximum distance between expansion joints in structures as per IS : 456 1978 is________________?
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A. 60 m

B. 20 m

C. 30 m

D. 45 m
10. The slab is designed as one way if the ratio of long span to short span is_____________?
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A. less than 1

B. between 1 and 1.5

C. greater than 2

D. between 1.5 and 2

11. According to IS : 456-1978, the cblumn or the strut is the member whose effective length is greater than________________?
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A. 4 times the least lateral dimension

B. the least lateral dimension

C. 2 times the least lateral dimension

D. 3 times the least lateral dimension
12. Finer grinding of cement______________?
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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

13. In a pile of length /, the points of suspension from ends for lifting it are located at______________?
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A. 0.207 1

B. 0.25 /

C. 0.333 /

D. 0.293 /

14. The minimum diameter of longitudinal bars in a column is________________?
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A. 6 mm

B. 12 mm

C. 8 mm

D. 16 mm

15. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than______________?
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A. 150 mm

B. 250 mm

C. 200 mm

D. 100 mm

16. When shear stress exceeds the permissible limit in a slab, then it is reduced by____________?
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A. using high strength steel

B. increasing the depth

C. using thinner bars but more in number

D. providing shear reinforcement

17. Modulus of elasticity of steel as per IS : 456-1978 shall be taken as______________?
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A. 20 kN/cm2

B. 2xl06N/cm2

C. 200kN/mm2

D. 200 kN/cm2

18. Workability of concrete is inversely proportional to______________?
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A. time of transit

B. vater-cement ratio

C. the air in the mix

D. size of aggregate

19. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than_______________?
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A. 40 mm

B. 15 mm

C. 25 mm

D. 30 mm

20. The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on______________?
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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