NCERT Exemplar VII — task. Science CBSE, Class 6.

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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

expands first, then on cooling contracts and fits onto the wooden wheel
contracts and fits onto the wooden wheel
no change in the size takes place
expands and fits onto the wooden wheel

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23. NCERT Exemplar VII

Exercise condition: