The venturi-meter works on :

- The principle of perpendicular axes
- Huygen’s principle
- Bernoulli’s principle
- The principle of parallel axes

The venturi-meter works on :

- The principle of perpendicular axes
- Huygen’s principle
- Bernoulli’s principle
- The principle of parallel axes

The correct answer is **3) Bernoulli’s principle**. A Venturi Meter operates based on Bernoulli’s principle, which states that the difference in pressure created across an obstacle determines the rate of fluid flow.

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