GATE 2026 PI – Question 37
Gas-atomized iron powder has tap density 3.26 g/cm³ and apparent density 2.66 g/cm³. Solid iron density is 7.85 g/cm³. Which is closest to its degree of densification (%)?
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Correct answer: (C) 33.89
Explanation
The relative bulk density based on the loose powder’s apparent density is $100(2.66/7.85)=33.8854\%$, giving **33.89%, C**. This is the definition intended by the official key. Using the tapped density would instead give 41.53%; the question supplies both densities but does not explicitly specify the packing state.