परोपकार: कस्मै भवति? Answer in one sentence.
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Ramesh is moving with umbrella held
upright at a time high speed wind blows
and umbrella get upturned Why?
(a) Hot air produces high pressure on the
upside of umbrella
(b) Hot air produce low pressure on the
upside of umbrella
(c) Air, produce same pressure on both side
(d) None of these.
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