Engineering Questions with Answers - Multiple Choice Questions

# Strength of Materials MCQ– Mass Moment of Inertia-Q10

1 - Question

What is the product of the mass and the square of the distance of the center of gravity of the mass from an axis? a) Moment of inertia b) Mass moment of inertia c) Center of gravity d) Product of inertia
View Answer Answer: b Explanation: The product of the mass and the square of the distance of the center of gravity of the mass from an axis is known as the mass moment of inertia about that axis.

2 - Question

What is the unit of mass moment of inertia? a) m4 b) m6 c) N d) m2
View Answer Answer: b Explanation: The mass moment of inertia is the product of moment of inertia and area. So L4 x L2 = L6. so its unit will be m6.

3 - Question

What is mass moment of inertia of circular plate? a) Md2/3 b) Md2/12 c) Mr2/4 d) Mr2/3

4 - Question

What is the mass MOI of a rectangular plate about x-axis passing through the C.G of the plate if the y-axis is parallel to d and perpendicular to b? a) Mb2/12 b) Md2/12 c) Md2/6 d) Mb2/6

5 - Question

What is the mass MOI of right circular cone of radius R and height H about its axis? a) 4MR2/10 b) MR2/10 c) 3MR2/10 d) MR2/12

6 - Question

What is the mass MOI of a hollow circular cylinder if R is the outer diameter and r is the inner diameter? a) M(R + r)/4 b) M(R – r )/4 c) M(R+ r)/2 d) M(R – r)/2
View Answer Answer: a Explanation: The mass MOI of a hollow circular cylinder is M(R + r)/4 where R is the outer diameter and r is the inner diameter.

7 - Question

What is the mass MOI of a rectangular plate about y-axis passing through the C.G of the plate if the y-axis is parallel to d and perpendicular to b? a) Mb2/12 b) Md2/12 c) Md2/6 d) Mb2/6

8 - Question

The product of inertia at the principal axes is _____________ a) Minimum b) Unit c) Zero d) Maximum

9 - Question

What is the unit of product of inertia? a) mm4 b) mm2 c) mm d) mm3

10 - Question

What is the product of inertia of the given following section? a) 50mm4 b) 625mm4 c) 125mm4 d) 250mm4
View Answer Answer: b Explanation: The product of inertia = area x points of C.G = ( 10×5) x 5 x 2.5 = 625mm4.

11 - Question

What is the product of inertia of a circle of diameter 10mm? a) 1862mm4 b) 1945mm4 c) 1963mm4 d) 2014mm4