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  4. Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air. Reason: Adiabatic process occurs at very high rate.

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Q. Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air.
Reason: Adiabatic process occurs at very high rate.

AIIMSAIIMS 2011Thermodynamics

Solution:

Pumping air inside the tyre is an adiabatic process, as it's very quick and compressed air inserts inside the tyre. Therefore, assertion and reason both are correct and reason is the correct explanation.