List of top Physics Questions on Rotational motion asked in KEAM

If a ring of mass 50 g and radius 2cm is rolling on a smooth horizontal platform with its centre of mass moving with a speed of 50 cms\(^{-1}\), then its total energy is
In a steam engine, the flywheel is used to resist
The angular momentum of a uniform rod of mass $m$ and length $l$, rotating in a horizontal circle about one of its ends with an angular velocity $\omega$ is
The moment of inertia of a solid sphere of radius $20cm$ about its diameter is same as that of a solid cylinder of same mass about its axis, then the radius of the cylinder in $cm$ is
When two rigid bodies with moments of inertia \(I_1\) and \(I_2\) and angular velocities \(\omega_1\) and \(\omega_2\) respectively are coupled in such a way that their rotation axes coincide, the angular velocity of the combination is \(\omega\). Then
Radius of gyration of a uniform circular disc of radius \(R\) about its diameter is
A rotating fly wheel with an initial angular speed of \( 4 \, \text{rad s}^{-1} \) has an angular acceleration of \( 2 \, \text{rad s}^{-2} \). The angle (in radian) it will turn in a time of \( 4 \, s \) from the start is
If the angular displacement made by a rotating wheel in 10 s is $150\pi$ radian, then the number of revolutions made by it is:
If a torque of 1.25 Nm acts on a circular ring for 4 s, then its angular momentum changes by ($kgm^2s^{-1}$):
The moment of inertia and rotational kinetic energy of a rigid body are 4 $kgm^2$ and 50 J respectively. The angular velocity of the body (in rad $s^{-1}$) is:
When a particle is rotating with constant angular momentum, then
A solid cylinder, a solid sphere, a disc and a ring are released from the top of an inclined plane (frictionless) so that they slide down the plane without rolling. The maximum acceleration down the plane is
If the moment of inertia of a circular disc about its central axis is I, then that for the same disc about its diameter is
The CORRECT statement for a rigid body rotating about a fixed axis with angular velocity \(\omega\) is
If the moment of inertia of a solid sphere of mass M and radius R about its diameter is I, then that of another sphere of mass 2M and radius 2R about its diameter is
With usual notations for a rigid body in rotational motion about a fixed axis, its
The ratio of radius of gyration of a circular ring to that of a circular disc, each of same mass and same radius about their respective central axes is
If a ring rolls down from top to bottom of an inclined plane, it takes time \(t_1\). If it slides, it takes time \(t_2\). Then the ratio \(\dfrac{t_1}{t_2}\) is
A disc spinning at the rate \(27.5\ \text{rad s}^{-1}\) is slowed at the rate \(10\ \text{rad s}^{-2}\). The time after which it will come to rest is
A solid sphere of radius \(r\) is revolving about one of its diameters with angular velocity \(\omega\). If it suddenly expands uniformly so that its radius increases to \(n\) times its original value, then its angular velocity becomes
The radius of gyration about an axis through the center of a hollow sphere with external radius $a$ and internal radius $b$ is (A) \( \sqrt{\frac{2}{5}\frac{(a^{3}-b^{3})}{(a^{5}-b^{5})}} \)
If the radius of the earth suddenly decreases by half of its present value, the time duration of one day will be (A) 6 hours
A wheel rotating at $12$ rev/s is brought to rest in $6$ s. The average angular deceleration in rad/s$^2$ of the wheel during this process is
A uniform rod of length $1$ m and mass of $2$ kg is attached to a side support at $O$ as shown in the figure. The rod is at equilibrium due to upward force $T$ acting at $P$. Assume the acceleration due to gravity as $10$ m/s$^2$. The value of $T$ is
If a body of moment of inertia \( 2 \text{ kg m}^2 \) revolves about its own axis making 2 rotations per second, then its angular momentum (in J s) is