Multiple choice

(NCERT): Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim

  1. Expands and fits onto the wooden wheel.

  2. Contacts and fits onto the wooden wheel.

  3. No change in the size takes place.

  4. Expands first, then on cooling contracts and fits onto the wooden wheel.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

fact

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