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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · ప్రశ్న 94

The metallurgical process in which the metal is obtained in a molten (fused) state is called:

  1. Roasting
  2. Calcination
  3. Froth flotation
  4. Smelting
  5. None of the above / More than one of the above
సమాధానం చూపించు & వివరణ

సమాధానం: (D) Smelting

వివరణ

In smelting (e.g. iron in a blast furnace), the metal is reduced and collected in molten form.

  • (A) తప్పు

    Wrong: heating ore in air below melting point.

  • (B) తప్పు

    Wrong: heating in limited/no air to remove volatiles.

  • (C) తప్పు

    Wrong: a concentration method for sulphide ores.

  • (D) సరైనది

    Correct: smelting reduces the ore at high temperature, giving molten metal.

  • (E) తప్పు

    Wrong: only one of the options A–D is correct.