21. For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is______________?
A. 3.5 m
B. 4 m
C. 4.5 m
D. 5 m
✅ The correct answer is option A.
Design of Concrete Structures MCQs
22. Workability of concrete is inversely pro¬portional to______________?
A. time of transit
B. ‘vater-cement ratio
C. the air in the mix
D. size of aggregate
✅ The correct answer is option A.
23. 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
✅ The correct answer is option B.
24. In a pile of length /, the points of suspension from ends for lifting it are located at______________?
A. 0.207 1
B. 0.25 /
C. 0.293 /
D. 0.333 /
✅ The correct answer is option A.
25. Most common method of prestressing used for factory production is________________?
A. Long line method
B. Freyssinet system
C. Magnel-Blaton system
D. Lee-Macall system
✅ The correct answer is option A.
26. 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
✅ The correct answer is option A.
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
✅ The correct answer is option A.
28. Air entrainment in the concrete increases________________?
A. workability
B. strength
C. the effects of temperature variations
D. the unit weight
✅ The correct answer is option A.
29. 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
✅ The correct answer is option A.
30. 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
✅ The correct answer is option A.