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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper I, General Studies · Q86 of 120

Geo-Scientist Prelims 2020 General Studies Q86: The scattering of a beam of light by colloidal particles is termed as:

QuestionChemistry / colloids

The scattering of a beam of light by colloidal particles is termed as:

  1. (a) Thomson effect
  2. (b) Raman effect
  3. (c) Tyndall effect
  4. (d) Compton effect

Answer: (c) Tyndall effect

Tyndall effect: colloidal particles (1–1000 nm) scatter light, making the beam path visible. Raman = inelastic scattering by molecules; Compton = X-ray scattering by electrons; Thomson = thermoelectric effect.

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