Q122 / 150 · MHT CET 2021 (23 Sep Shift 2) · Physics

Figure shows triangular lamina which can rotate about different axes. Moment of inertia is maximum, about the axis

A
PR
B
QS
Correct answer
C
QR
D
PQ

Solution

The moment of inertia is given by $$ \mathrm{I}=\sum \mathrm{m}_{\mathrm{i}} \mathrm{r}_{\mathrm{i}}^2 $$ If the distance of particles from the axis of rotation is larger, then the moment of inertia will be larger. For axis $\mathrm{QR}$, the particles will be situated at greater distances and hence the moment of inertia will be greater.

Hence, the correct answer is option: 'C'.

Relevant Questions

Two identical rings A and B of same mass and radius are revolving, ring A arounds its own diameter and ring B about tangential axis in its o20 Apr, 2026 (M)Moment of inertia of rigid bodies
A solid sphere of mass 5 kg and a disc of mass 4 kg have the same radius. The ratio of moment of inertia of the sphere about its tangent to 20 Apr, 2026 (E)Moment of inertia of rigid bodies
The radius of gyration of a solid sphere of radius 'R' and mass 'M' about its diameter is and that about a tangent of a solid sphere is . Th19 Apr, 2026 (M)Moment of inertia of rigid bodies
A thin uniform rod AB of mass ' ' and length ' ' is hinged at one end A to the ground level. Initially the rod stands vertically and is allo19 Apr, 2026 (M)Moment of inertia of rigid bodies
The radius of gyration K of a hollow sphere of mass M and radius R about an axis XY is equal to R as shown in figure. The distance of that a18 Apr, 2026 (M)Moment of inertia of rigid bodies
Given identical rings are arranged in a hexagonal plane pattern so as to touch each neighbouring ring as shown in figure. Each ring has mass18 Apr, 2026 (E)Moment of inertia of rigid bodies