Question

The pressure at the top of a building of height $200m$ is $500kPa$. The minimum pressure required at the base of the building to pump water to a closed tank on the top of the building is($g=10m/s^2$)

• A. $2.5\times {10}^{4}Pa$
• B. $2.5\times {10}^{5}Pa$
• C. $2.5\times {10}^{6}Pa$
• D. $2.5\times {10}^{3}Pa$

Answer 1

Answer: (C)

$2.5\times {10}^{6}Pa$

So,
Minimum pressure required at the base of building
$=500\times {10}^3+1000\times 10\times 200$
$=500\times {10}^5+20\times {10}^5=25\times {10}^{5}Pa$
$=2.5\times {10}^{6}Pa$