Question

AN IRON RIM IS MADE SLIGHTLY SMALLER THAN THE
WOODEN WHEEL(AROUND WHICH IT IS FITTED ).THIS
IRON RIM IS HEATED UNIFORMLY DUE TO WHICH IT
UNDERGOES A CHANGE PAND CAN BE EASILY PUT
AROUND THE WOODEN WHEEL.WHEN COLD WATER IS
POURED OVER THIS HOT RIM, IT UNDERGOES ANOTHER
CHANGE Q AND FITS TIGHTLY OVER THE WOODEN
WHEEL.AFTER A CONSIDERABLE TIME, A CHANGER
TAKES PLACE IN THE IRON RIM DUE TO WHICH A RED
BROWN COATING IS FORMED ON IT.
Q) WHAT ARE CHANGES P, Q AND R?
Q) OUT OF P, Q AND R WHICH CHANGE/CHANGES ARE
REVERSIBLE ?​

Answer 1

Answer:

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Answer 2

Explanation:

When the iron rim is heated uniformly due to which it undergoes expansion by increasing the volume of iron. Hence, the change P is expansion and due to the expansion of iron rim it can be easily put around the wooden wheel.