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Whater is poured into an inverted cone of semi-vertical angle `45^(@)` at rate of `2 cu.` in . /min .The rate at which the depth of water in the cone is increasing when the depth is 4 in. is

A

`(1)/(8pi)` in . /min.

B

`(8)/(pi)` in. /min.

C

`(pi)/(8)` in. /min.

D

`8 pi` in. /min.

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The correct Answer is:
A
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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