If by dropping a stone in a quiet lake a wave moves in circle at a speed of 3.5 cm/sec, then the rate of increase of the enclosed circular region when the radius of the circular wave is 10 cm, is \[\left( \pi =\frac{22}{7} \right)\] [MP PET 1998]

If by dropping a stone in a quiet lake a wave moves in circle at a spe

1.	If by dropping a stone in a quiet lake a wave moves in circle at a speed of 3.5 cm/sec, then the rate of increase of the enclosed circular region when the radius of the circular wave is 10 cm, is \[\left( \pi =\frac{22}{7} \right)\] [MP PET 1998]
A.	220 sq. cm/sec
B.	110 sq. cm/sec
C.	35 sq. cm/sec
D.	350 sq. cm/sec
Answer» B. 110 sq. cm/sec

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If by dropping a stone in a quiet lake a wave moves in circle at a speed of 3.5 cm/sec, then the rate of increase of the enclosed circular region when the radius of the circular wave is 10 cm, is \[\left( \pi =\frac{22}{7} \right)\] [MP PET 1998]

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