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Oscillations — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsOscillations1 Mark
MCQ
The rotation of earth about its axis is:
  1. Periodic motion.
  2. Simple harmonic motion.
  3. Periodic but not simple harmonic motion.
  4. Non$-$periodic motion.
  • A
    $A$ and $D$
  • B
    $A$ and $B$
  • ✓
    $A$ and $C$
  • D
    $C$ and $D$
✓

Answer

Correct option: C.
$A$ and $C$

Rotation of earth about its axis repeats its motion after a fixed interval of lime,
so its motion is periodic.
The rotation of earth is obviously not a to and fro type of motion about a fixed point,
hence its motion is not an oscillation.
Also this motion does not follow $\text{S.H.M}$ equation, $\text{a}\propto-\text{x}$
Hence, this motion is not a $\text{S.H.M.}$

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