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Error and Uncertainty

The height of...

Question

The height of a hollow cylinder is $14 c m$ . If external diameters is $16 c m$ and total curved surface of the hollow cyling is $1320 s q . c m$ , then its internal diameter is:

14 c m

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16 c m

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7 c m

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8 c m

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Solution

The correct option is D $14 c m$
$2 π R H + 2 π r H = 1320$
$2 π (14) (8 + r) = 1320$
$8 + r = 15; r = 7$
$2 r = 14$

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