GATE AG 2009 • Q18 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Engineering Properties of Agriculture Produce

Subtopic: Electrical properties

Question Statement:

If bulk density of a particulate material is 600 kg m⁻³ and true density is 1000 kg m⁻³, the porosity of the material is

Options:

  • (A) 20%
  • (B) 40%
  • (C) 60%
  • (D) 80%

Official Answer Key:

B

Step-by-Step Solution & Explanation

Porosity ε = 1 − (ρ_bulk/ρ_true) = 1 − 600/1000 = 1 − 0.6 = 0.40 = 40%, matching option (B).

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