Civil Engineering MCQJE Level Civil Engineering
A hollow shaft (D_o=100mm, D_i=50mm) vs solid shaft (D=100mm), same material and torque. Hollow shaft weight saving:
Strength of MaterialsTorsionMEDIUM
Choose the correct answer
A
75%
B
25%
C
50%
D
12.5%
Correct Answer
B. 25%
Why is this the answer?
Weight ∝ cross-sectional area. Solid: π×100²/4. Hollow: π(100²−50²)/4 = π×7500/4. Saving = (100²−(100²−50²))/100² = 2500/10000 = 25%.
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This MCQ belongs to Magic Mock Test Series — RRB JE Civil (CBT-2). Full tests include timed attempts, rank comparison and subject-wise analysis.