Question:If the height of cone is doubled, then its volume is increased by : 

A `100%` 
B `200%` 
C `300%` 
D `400%` 

+ Answer
A 

+ Explanation
Let the original height = h. Then, volume 

`= 1/3 π r^2 h.`

New height`= 2h.` So, volume 

`=1/3 π r^2 xx 92h)`

`= 2(1/3 π r^2 h)`

:. Increase `= ((1/3 π r^2h)/(1/3 π r^2h) xx 100)%`

`= 100%`.

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Irin Moni

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