Civil Engineering - UPSC Civil Service Exam Questions - Discussion


The moment of inertia of a given rectangular area is minimum about

[A]. its longer centroidal axis
[B]. its polar axis
[C]. its axis along the diagonal
[D]. its shorter centroidal axis

Answer: Option D


No answer description available for this question.

Harshad said: (Jun 21, 2017)  
It should be longer centroidal axis.

Sudhansu Bhagat said: (Dec 6, 2017)  
BD^3/12. So it's longer is minimum.

Anburaja said: (May 17, 2018)  
Maximum at the major axis.
Minimum at the minor axis.

Harish said: (Oct 20, 2018)  
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.

A Ali said: (Dec 20, 2020)  
Longer axis should be correct.

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