Question

7.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

Answer 1

Answer:

BEACUSE OF HEATING THE METAL EXPANDS

Explanation:

AFTER HEATING THE METAL THE METAL EXPANDS AND HENCE FITS INTO THE WHEEL. THEN COLD WATER IS POURED OVER THE METAL FOR CONTRACTION. THIS MAKES THE RIM TIGHT ON THE WHEEL.