2. A soap bubble is blown with the help of a mechanical pump at the mouth of a tube. The pump produces a certain increase per minute in the volume of the bubble, irrespective of its internal pressure. The graph between the pressure inside the soap bubble and time t will be-
Ans. a
(15)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)