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Systems of Particles and Rotational Motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsSystems of Particles and Rotational Motion1 Mark
MCQ
When a disc rotates with uniform angular velocity, which of the following is not true?
  • A
    The sense of rotation remains same.
  • B
    The orientation of the axis of rotation remains same.
  • C
    The speed of rotation is non-zero and remains same.
  • D
    The angular acceleration is non-zero and remains same.
✓

Answer

  1. The angular acceleration is non-zero and remains same.

Explanation:

$\because\ \omega$ is uniform or constant

$\therefore\ \alpha=\frac{\text{d}\omega}{\text{dt}}$

$\Rightarrow\alpha=0$

Hence, angular acceleration is zero, not non zero.

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