Q. A pump motor is used to deliver water at a certain rate from s given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to
A) $16$ times
B) 4 times
C) 8 times
D) 2 times
Explanation
(c) Power of a pump $= \frac{1}{2}\ \rho Av^{3}$
To get twice amount of water from same pipe$\ v$ has to be made twice. So power is to be made 8 times
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.