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Thermal Properties of Matter — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThermal Properties of Matter1 Mark
MCQ
As the temperature is increased, the time period of a pendulum:
  • A
    Increases as its effective length increases even though its centre of mass still remains at the centre of the bob.
  • B
    Decreases as its effective length increases even though its centre of mass still remains at the centre of the bob.
  • C
    Increases as its effective length increases due to shifting of centre of mass below the centre of the bob.
  • D
    Decreases as its effective length remains same but the centre of mass shifts above the centre of the bob.
✓

Answer

  1. Increases as its effective length increases even though its centre of mass still remains at the centre of the bob.

Explanation:

As the temperature increased the length L increase due to expansion (Linear) and,

$\text{T}=\sqrt{\frac{\text{L}}{\text{g}}}\text{ or }\text{T }\alpha\ \sqrt{\text{L}}$

So on increasing temperature, its effective length increases hence T also increases.

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