📊 Metallurgy
Q. On Moh's scale, materials with hardness number less than 4 are
  • (A) Topaz, Corundum, Diamond
  • (B) Hardened and tempered
  • (C) Felspar, corundum, Diamond
  • (D) Talc, gypsum, calcite
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✅ Correct Answer: (D) Talc, gypsum, calcite

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