NextMockपरीक्षा शोधा, उदा. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · प्रश्न 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
उत्तर दाखवा आणि स्पष्टीकरण

उत्तर: (D) It increases over a long time

स्पष्टीकरण

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

  • (A) चूक

    Wrong: it does not first decrease.

  • (B) चूक

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

  • (C) चूक

    Wrong: oxygen and water are added.

  • (D) बरोबर

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

  • (E) चूक

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