Point masses m₁ and m₂, are placed at the opposite ends of a rigid rod of length L and negligible mass. The rod is set into rotation about an axis perpendicular to it. The position of point P on this rod through which the axis should pass so that the work required to set the rod rotating with angular velocity ${\mathrm{\omega }}_0$ is minimum, is given by:

1. $x=\frac{m_{1}L}{m_1+m_2}$

2. $x=\frac{m_1}{m_2}L$

3. $x=\frac{m_2}{m_1}L$

4. $x=\frac{m_{2}L}{m_1+m_2}$

Three identical spherical shells, each of mass m and radius r are placed as shown in the figure. Consider an axis XX', which is touching two shells and passing through the diameter of the third shell. The moment of inertia of the system consisting of these three spherical shells about the XX' axis is:

          

The moment of inertia of a uniform circular disc is maximum about an axis perpendicular to the disc and passing through:

1. C 
2. D
3. A
4. B  

The moment of inertia of a thin uniform rod of mass \(M\) and length \(L\) about an axis passing through its mid-point and perpendicular to its length is \(I_0\). Its moment of inertia about an axis passing through one of its ends and perpendicular to its length is:
1. \(I_0+\frac{ML^2}{4}\)
2. \(I_0+2ML^2\)
3. \(I_0+ML^2\)
4. \(I_0+\frac{ML^2}{2}\)

From a circular disc of radius \(R\) and mass \(9M,\) a small disc of mass \(M\) and radius \(R/3\) is removed concentrically. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through its centre is:
1. \(MR^{2}\)
2. \(4MR^{2}\)
3. \(\frac{4}{9}MR^{2}\)
4. \(\frac{40}{9}MR^{2}\)

The ratio of the radii of gyration of a circular disc to that of a circular ring, each of the same mass and radius, around their respective axes is:
1. \(\sqrt{3}:\sqrt{2}\)
2. \(1:\sqrt{2}\)
3.\(\sqrt{2}:1\)
4. \(\sqrt{2}:\sqrt{3}\)

A thin rod of length L and mass M is bent at its midpoint into two halves so that the angle between them is 90^o. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is:

1.  $\frac{{\mathrm{ML}}^2}{24}$

2.  $\frac{{\mathrm{ML}}^2}{12}$

3.  $\frac{{\mathrm{ML}}^2}{6}$

4.  $\frac{\sqrt{2}{\mathrm{ML}}^2}{24}$

The moment of inertia of a uniform circular disc of radius \(R\) and mass \(M\) about an axis touching the disc at its diameter and normal to the disc is:
1. $M{R}^2$

2. $\frac{2}{5}M{R}^2$

3. $\frac{3}{2}M{R}^2$

4. $\frac{1}{2}M{R}^2$