According to the material, which action increases the flow of a liquid in a system?

According to the material, which action increases the flow of a liquid in a system?

• A. Increase velocity of liquid
• B. Increase viscosity
• C. Decrease pressure
• D. Increase pipe length

Answer: (A)

Flow rate increases when the liquid’s velocity through the system goes up, because how much liquid passes a given point each second is tied to speed. With a constant pipe cross-section, flowing faster means more volume moves per unit time, so the flow rate rises (Q = v × A). Raising viscosity would make flow harder, reducing velocity for a given driving force. Lowering the pressure reduces the driving force that pushes the liquid, lowering flow. Increasing pipe length adds resistance (more friction losses), which also lowers flow unless the pressure gradient is increased.

Flow rate increases when the liquid’s velocity through the system goes up, because how much liquid passes a given point each second is tied to speed. With a constant pipe cross-section, flowing faster means more volume moves per unit time, so the flow rate rises (Q = v × A).

Raising viscosity would make flow harder, reducing velocity for a given driving force. Lowering the pressure reduces the driving force that pushes the liquid, lowering flow. Increasing pipe length adds resistance (more friction losses), which also lowers flow unless the pressure gradient is increased.