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Is Matter Around Us Pure — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure1 Mark
MCQ
Tyndall effect can be observed in a colloidal solution. Consider light scattering in the following:

  1. When sunlight passes through the canopy of a dense forest.
  2. When normal light passes through copper sulphate solution.
  3. When normal light passes through milk.
  4. When a fine beam of light enters a room through a small hole.

Tyndall effect is observed in:

    • A
      I and IV
    • B
      I, III and IV
    • C
      II and III
    • D
      III and IV
    ✓

    Answer

    1. I, III and IV

    Explanation:

    Tyndall effect refers to the process by which light is scattered by colloids or suspension making the path of the light to be visible. 

    In the forests, the air contains mists which acts as the colloids hence when light seeps in through the canopy one clear sees its path.

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