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Matter in Our Surroundings — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
MCQ
A solid substance possess:
  • A
    Rigidity, fluidity and weak force of attraction.
  • B
    Rigidity, fluidity and fixed volume.
  • C
    Rigidity, fixed volume and high attractive forces of attraction.
  • D
    Rigidity, fixed shape and large intermolecular space between particles.
✓

Answer

  1. Rigidity, fixed volume and high attractive forces of attraction.

Explanation:

SOLID:

  1. strong intermolecular forces.
  2. Particles vibrate in place.
  3. low kinetic energy (KE).
  4. Definite shape.
  5. Definite volume.
  6. Incompressible.
  7. High density (as compared to same substance as a liquid or gas)
  8. low rate of diffusion (millions of times slower than in liquids)
may be crystalline or amorphous.

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