21. The radius of a bar bend to form a hook, should not be less than_______________?
A. Twice the diameter
B. Thrice the diameter
C. Four times the diameter
D. Five times the diameter
✅ The correct answer is option A.
RCC Structures Design MCQs
22. If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as___________________?
A. wl²/4
B. wl²/8
C. wl²/10
D. wl²/12
✅ The correct answer is option B.
23. [A + (m – 1)ASC] known as equivalent concrete area of R.C.C. is given by______________?
A. Modular ratio method
B. Load factor method
C. Ultimate load method
D. None of these
✅ The correct answer is option A.
24. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called________________?
A. Under-reinforced section
B. Over reinforced section
C. Economic section
D. Critical section
✅ The correct answer is option B.
25. The maximum shear stress (q) in concrete of a reinforced cement concrete beam is_____________?
A. Shear force/(Lever arm × Width)
B. Lever arm/(Shear force × Width)
C. Width/(Lever arm × Shear force)
D. (Shear force × Width)/Lever arm
✅ The correct answer is option A.
26. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is_______________?
A. 8.3 kg/cm2
B. 7.6 kg/cm2
C. 21.5 kg/cm 2
D. 11.4 kg/cm2
✅ The correct answer is option A.
27. The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes_______________?
A. With the horizontal
B. With the vertical
C. With the perpendicular to the inclined plane of the soil
D. None of these
✅ The correct answer is option A.
28. Based on punching shear consideration, the overall depth of a combined footing under a column A, is_______________?
A. (Area of the column A × Safe punching stress)/Load on column A
B. (Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
C. (Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
D. None of these
✅ The correct answer is option B.
29. Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of_______________?
A. 0.1 L from the outer edge of column
B. 0.1 L from the centre edge of column
C. Half the distance of projection
D. One -fourth the distance of projection
✅ The correct answer is option B.
30. is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is_________________?
A. f = (P/A) + (Z/M)
B. f = (A/P) + (M/Z)
C. f = (P/A) + (M/Z)
D. f = (P/A) + (M/6Z)
✅ The correct answer is option C.