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Model Paper 1 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 11 Mark
MCQ
Assertion (A): Solids do not diffuse in air.
Reason (R): The particles are closely packed in solids.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false
  • D
    A is false but R is true
✓

Answer

Correct option: A.
Both A and R are true and R is the correct explanation of A.
(a) Both A and R are true and R is the correct explanation of A.
Explanation: As the particles of solids are closely packed, there exist strong forces of attraction between the particles. Hence, solids do not diffuse in air.

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