In a mock-test problem built around material removed from the core of a circular shaft, which answer is most appropriate? Avoid the common trap that maximum torsional stress occurs at the inner radius.
Choose the correct answer
maximum torsional stress occurs at the inner radius
polar moment depends only on area
a hollow shaft can be more efficient by placing material away from the centre
removing core material always reduces strength in the same proportion as area
Correct Answer
C. a hollow shaft can be more efficient by placing material away from the centre
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
Torsional resistance benefits from material at larger radius. Correct option: C.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to RRB JE Civil & Allied Engineering CBT-2 Full Mock Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.