Question

An iron pipe is $0.35$ m long, its external and internal diameter are $8$ cm and $6$ cm respectively. The volume (in cc) of the pipe is ? $(givenpi=\frac{22}{7})$

• A. $1100$
• B. $11000$
• C. $110$
• D. $770$

Answer 1

Answer: (D)

$770$

Volume of the pipe $=\pi (r_2^2-r_1^2)h$
$\Rightarrow$ Volume $=\pi \times (4^2-3^2)\times 35$
$\Rightarrow$ Volume $=\frac{22}{7}\times 7\times 1\times 35$ cc
$\Rightarrow$ Volume $=770$ cc