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A spherical ballon is being inflated at...

A spherical ballon is being inflated at the rate of 35cc/min. The rate of increases in the surface area `("in" cm^(2) "min")` of the ballon when its diameter is 14 cm, is :

A

10

B

`sqrt(10)`

C

100

D

`10sqrt(10)`

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The correct Answer is:
A
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AAKASH SERIES-RATE MEASUREMENT-PRACTICE SHEET (EXERCISE - 1) (LEVEL - 1) (STRAIGHT OBJECTIVE TYPE QUESTION)
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  19. Each side of an equilateral triangle expands at the rate of 2 cm/sec. ...

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