Question

The distance in the parallel axis theorem for the use in the determination of the moment of inertia about an inclined axis is multiplied by:

(a) Area

(b) Volume

(c) Linear distance

(d) Area/Volume

I got this question in an interview for internship.

Enquiry is from Moments of Inertia for an Area About Inclined Axis topic in chapter Moments of Inertia of Engineering Mechanics

Answer 1

The correct choice is (a) Area

Easy explanation: Parallel axis for any area is used to add the two mutually perpendicular moment of inertias for areas. It gives a moment of inertia perpendicular to the surface of the body. And uses the square of the distance from the axis of rotation multiplied by the area.