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The tyre of a motor car contains air at $15^{\circ}C$. If the temperature increases to $35^{\circ}C$ the approximate percentage increase in pressure is (ignore to expansion of tyre):

\[\begin {array} {1 1} (a)\;7 & \quad (b)\;9 \\ (c)\;11 & \quad (d)\;13 \end {array}\]
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(A) 7
Hence A is the correct answer.
answered Mar 24, 2014 by meena.p

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