Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 4 (Q.No. 1)
1.
The moment of inertia of a given rectangular area is minimum about
its longer centroidal axis
its polar axis
its axis along the diagonal
its shorter centroidal axis
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
5 comments Page 1 of 1.

A Ali said:   4 years ago
Longer axis should be correct.

Harish said:   6 years ago
It will be a longer centroidal axis.

This is because MI = sum of mass elements with their distance squares.

Distance squares sum will be minimum if the axis of rotation/reference is taken as LONGER centroidal axis.

Anburaja said:   6 years ago
Maximum at the major axis.
Minimum at the minor axis.

SUDHANSU BHAGAT said:   7 years ago
BD^3/12. So it's longer is minimum.

Harshad said:   7 years ago
It should be longer centroidal axis.

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