Question: 10 The venturi-meter works on :
(1) The principle of parallel axes
(2) The principle of perpendicular axes
(3) Huygen’s principle
(4) Bernoulli’s principle
Answer: Option (4)
Explanation:
A venturi-meter is a device used to measure the flow speed of a fluid in a pipe.
It works on Bernoulli’s principle, which states that for a flowing fluid,
an increase in velocity occurs simultaneously with a decrease in pressure.
In a venturi-meter, the fluid flows through a narrow constriction where its velocity
increases and pressure decreases.
The pressure difference between the wider section and the constricted section is
used to determine the flow rate of the fluid.
Therefore, the venturi-meter works on Bernoulli’s principle.