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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · ప్రశ్న 97

What change occurs in the weight of iron when it rusts?

  1. It first decreases and then increases
  2. It first increases and then decreases
  3. It remains the same
  4. It increases over a long time
  5. None of the above / More than one of the above
సమాధానం చూపించు & వివరణ

సమాధానం: (D) It increases over a long time

వివరణ

Rusting combines iron with oxygen and moisture, so the rusted object weighs more.

  • (A) తప్పు

    Wrong: it does not first decrease.

  • (B) తప్పు

    Wrong: it does not decrease (unless flakes fall off).

  • (C) తప్పు

    Wrong: oxygen and water are added.

  • (D) సరైనది

    Correct: rust (Fe₂O₃·xH₂O) adds oxygen and water, increasing weight.

  • (E) తప్పు

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