Civil Engineering MCQJE Level Civil Engineering
Second moment of area (moment of inertia) of a rectangle (b wide, d deep) about its centroidal axis parallel to width:
Engineering MechanicsCentroid and Moment of InertiaEASY
Choose the correct answer
A
bd³/12
B
bd³/3
C
b³d/12
D
bd²/6
Correct Answer
A. bd³/12
Why is this the answer?
Ixx (centroidal, parallel to b) = bd³/12. About base: bd³/3. Ixx = bd³/12 and Iyy = b³d/12. Parallel axis theorem: I = Ic + A×d² where d=distance between axes.
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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.