Quiz  /  Rotational Inertia Class 12 MCQ Questions With Answers

  • 1. 
    A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

  • her moment of inertia increases and her angular speed decreases.
  • her moment of inertia decreases and her angular speed increases.
  • her moment of inertia increases and her angular speed increases.
  • her moment of inertia increases and her angular speed remains the same.

  • 2. 
    When this girl lets go of her string, what happens to the ball?

  • it flies straight due to law of inertia
  • it flies straight due to law of centripetal force
  • it curves due to rotational inertia
  • it curves due to its tangential speed

  • 3. 
    What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

  • 5 m/s2
  • 17.63 m/s2
  • 10 m/s2
  • 8.81 m/s2

  • 4. 
    Which forms of energy are present for objects rolling down an incline?

  • Gravitational potential energy
  • Rotational kinetic energy
  • Kinetic energy
  • All of above

  • 5. 
    What's the centripetal acceleration of a .2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

  • 8.23 m/s2
  • 10.54 m/s2
  • 12.86 m/s2
  • 17.39 m/s2

  • 6. 
    The train wheel in the picture has radius = 1.00 meter and it's mass is 352 kg. What is it's Moment Of Inertia?

  • 320 kg^2
  • 352 kg*m^2
  • 176 kg*m^2
  • 141.75 m^2

  • 7. 
    When 6.0 Nm of torque is applied to a wheel it constantly accelerates at 30 rad/s^2. What is the moment of inertia of the wheel? Hint: T = IαHint:\ T\ =\ I\alphaHint: T = Iα

  • 2 Nm22\ Nm^22 Nm2
  • 0.20 Nm20.20\ Nm^20.20 Nm2
  • 20.0 Nm220.0\ Nm^220.0 Nm2
  • Undefined because it′s 10Undefined\ because\ it's\ \frac{1}{0}Undefined because it′s 01​

  • 8. 
    If the same torque is applied on a hoop (I=MR2) and a solid disk (I=1/2MR2), after 5s which object will be moving faster?

  • Hoop
  • Solid Disk

  • 9. 
    The drum of a washing machine rotates 1800 times in 3 minutes. What is the period?

  • 0.1 s
  • 0.2 s
  • 0.3 s
  • 0.5 s

  • 10. 
    What is the angular acceleration of an object that has rotational inertia of 4 kg.m2 and submitted to a torque of 8 N.m?

  • 0.5 rad/s2
  • 2 rad/s2
  • 4 rad/s2
  • 8 rad/s2

  • 11. 
    What would happen to the length of one day if Earth's moment of inertia were to increase?

  • The day would be longer.
  • The day would be shorter.
  • The day would stay the same.
  • All of above
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