$Assertion :$ A bubble comes from the bottom of a lake to the top.
$Reason :$ Its radius increases.
$Reason :$ Its radius increases.
AIIMS 2008, Easy
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The pressure will be greater at the bottom than at the top. So the air bubble moves from the bottom to the top i.e., from higher to lower pressure. Further in coming from bottom to top, the pressure decreases and hence volume increases (By Boyle's law, $PV =$ constant), thus radius also increases.
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