Mensuration Practice Test 2

Question : 36 of 40

Marks: +1, -0

A well of inner diameter 14 m is dug to a depth of 15 m. Earth taken out of it had been evenly spread all around it to a width of 7 m to form an embankment. Find the height of the embankment so formed.

7 m
5 m
14 m
None of these

Validate

Solution:

Volume dug =

πr^2 h

{22}/7× 7 × 7 × 15

= 2310

m^3

Area of embankment =

π(R_1^2-r_1^2)

π(14^2-7^2)

{22]/7 (196-49)

{22}/7 × 147

= 462

m^2

Height of the embankment =

{\Volume}/{\Area}

{2310}/{462}

= 5 m

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