A. increase in water-cement ratio
B. increase in fineness of cement
C. decrease in curing time
D. decrease in size of aggregate
✅ The correct answer is option B.
Design of Concrete Structures MCQs
52. The percentage of voids in cement is approximately_______________?
A. 25%
B. 40%
C. 60%
D. 80%
✅ The correct answer is option B.
53. Bulking of sand is maximum if moisture content is about____________?
A. 2 %
B. 4%
C. 6%
D. 10%
✅ The correct answer is option B.
54. 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
✅ The correct answer is option B.
55. As per Whitney’s theory, the maximum moment of resistance of the balanced section of a beam of width b and effective depth d is given by_______________?
A. ^acybd2
B. ^acybd2
C. 0.185acybd2
D. 0.43acybd2
✅ The correct answer is option B.
56. The approximate value of the ratio between direct tensile strength and flexural strength is_____________?
A. 0.33
B. 0.5
C. 0.75
D. 1.0
✅ The correct answer is option B.
57. Normally prestressing wires are arranged in the_______________?
A. upper part of the beam
B. lower part of the beam
C. center
D. anywhere
✅ The correct answer is option B.
58. In counterfort retaining walls, the main reinforcement in the stem at support is_______________?
A. not provided
B. provided only on inner face
C. provided only on front face
D. provided both on inner and front faces
✅ The correct answer is option B.
59. A higher modular ratio shows____________?
A. higher compressive strength of con-crete
B. lower compressive strength of concrete
C. higher tensile strength of steel
D. lower tensile strength of steel
✅ The correct answer is option B.
60. 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
✅ The correct answer is option B.