Question

For the flow of incompressible liquid through a pipe, the Venturi-meter is used to measure the:

• A. Pressure of liquid
• B. Volume of flow
• C. Speed of flow
• D. Temperature of liquid
• E. Mass of liquid flown

Hint:

A Venturi meter works on the principle of Bernoulli’s equation, where the pressure difference between two sections of the pipe is used to calculate the speed of the fluid flow.

Answer 1

The Correct Option is C

A Venturi meter is an instrument used to measure the flow rate of an incompressible fluid (liquid) through a pipe. It operates based on the principle of Bernoulli’s equation, which relates the pressure, velocity, and height at different points in a fluid flow.

The Venturi meter consists of a pipe that has a narrowing section. According to Bernoulli’s principle, as the fluid flows through the constricted section of the pipe, the velocity of the fluid increases, and the pressure decreases. The difference in pressure between the wider and narrower sections of the pipe can be used to calculate the velocity (speed) of the fluid.

Thus, the Venturi meter is specifically used to measure the speed of flow (velocity) of the liquid, not its pressure, volume, temperature, or mass.

Therefore, the correct answer is:

\[ \boxed{\text{C) Speed of flow}} \]