Explore topic-wise MCQs in Civil Engineering.

This section includes 57 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.

51.

A stepped steel shaft shown below is subjected to 10 Nm torque. If the modulus of rigidity is 80 GPa, the strain energy in the shaft in N-mm is

A. 4.12
B. 3.46
C. 1.73
D. 0.86
Answer» D. 0.86
Discussion
52.

A solid circular shaft of 4 cm in diameter is subjected to a shear stress of 20 kN/cm2, then the value of twisting moment (kN-cm) will be:

A. 80 π
B. 20 π
C. 15 π
D. 10 π
Answer» B. 20 π
Discussion
53.

A shaft of diameter 8 cm is subjected to a bending moment of 3000 N m and a twisting moment 4000 N m. The maximum normal stress induced in the shaft is equal to

A. \(\frac{{250}}{\pi }MPa\)
B. \(\frac{{500}}{\pi }MPa\)
C. \(\frac{{157.5}}{\pi }MPa\)
D. \(\frac{{315}}{\pi }MPa\)
Answer» B. \(\frac{{500}}{\pi }MPa\)
Discussion
54.

For solid shaft subjected to a torque of 18000 Nm having a permissible shear stress of 60 N/mm2 the diameter of shaft is

A. 115 mm
B. 121 mm
C. 149 mm
D. 108 mm
Answer» B. 121 mm
Discussion
55.

A bar of circular cross-section is clamped at ends P and Q as shown in the figure. A torsional moment

A. (50, 100)
B. (75, 75)
C. (100, 50)
D. (120, 30)
Answer» D. (120, 30)
Discussion
56.

A bending moment of 400 kNm and a twisting moment of 300 kNm is applied on a circular solid shaft. If direct stress based on maximum principal stress theory is σ and shear stress based on maximum shear stress theory is τ, then \(\frac{\sigma }{\tau }\) is:

A. \(\frac{5}{9}\)
B. \(\frac{5}{3}\)
C. \(\frac{3}{5}\)
D. \(\frac{9}{5}\)
Answer» E.
Discussion
57.

Moment of Inertia of a Circular lamina of radius 10 cm and mass 100 kg is given by

A. 100000 kg cm2
B. 5000 kg cm2
C. 10000 kg cm2
D. 98000 kg cm2
Answer» C. 10000 kg cm2
Discussion