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Flame SCF 18 Near Chawla Lights Ph-7 Mohali 9888949978

2. A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent of heat is J, then the rise in temperature will be

(a) 2T/rJ

(b) 3T/RJ

(c) 3T/J[(1/R )-(1/R)]

(d) 2T/J[(1/r)-(1/R)]

Ans. c

5/5 - (1 vote)

PrevPrevious6. The diagram shows a force-extension graph for a rubber band. Consider the following statementsI. It will be easier to compress this rubber than expand it II. Rubber does not return to its original length after it is stretched III. The rubber band will get heated if it is stretched and released Which of these can be deduced from the graph

Next11. The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. P and Q representNext

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