NextMockಪರೀಕ್ಷೆಗಳನ್ನು ಹುಡುಕಿ, ಉದಾ. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · ಪ್ರಶ್ನೆ 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
ಉತ್ತರ ತೋರಿಸು ಮತ್ತು ವಿವರಣೆ

ಉತ್ತರ: (D) It increases over a long time

ವಿವರಣೆ

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

  • (A) ತಪ್ಪು

    Wrong: it does not first decrease.

  • (B) ತಪ್ಪು

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

  • (C) ತಪ್ಪು

    Wrong: oxygen and water are added.

  • (D) ಸರಿ

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

  • (E) ತಪ್ಪು

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