NextMockதேர்வுகளைத் தேடுங்கள், எ.கா. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · வினா 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
விடையைக் காட்டு & விளக்கம்

விடை: (D) It increases over a long time

விளக்கம்

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

  • (A) தவறு

    Wrong: it does not first decrease.

  • (B) தவறு

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

  • (C) தவறு

    Wrong: oxygen and water are added.

  • (D) சரி

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

  • (E) தவறு

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