If the speed of a centrifugal pump is doubled, the power required will be increased by

Answer: Option D

Understanding Centrifugal Pumps and Power
Centrifugal pumps use spinning blades to push water (or other liquids). The faster the blades spin (speed), the more water the pump moves.

Power and Speed Relationship
The power needed to run a centrifugal pump isn't just doubled if you double the speed. It increases much faster. This is because power is related to the cube of the speed.

The Calculation (Simplified)
Imagine the speed is 'S' and power is 'P'. If we double the speed (2S), the new power isn't 2P, it's (2S)³ = 8S³, which is 8 times the original power.

Therefore
If you double the speed of a centrifugal pump, the power needed will increase by eight times.