Which of the following effects is observed in a Venturi metre, when liquid flows through thenarrow section of the pipe?
Correct answer: A. Pressure is reduced
- A. Pressure is reduced
- B. Pressure is increased
- C. Viscosity is increased
- D. Viscosity is decreased
Explanation
The correct answer is that pressure is reduced. In a Venturi meter, when a liquid flows through the narrow section, its velocity increases. According to Bernoulli's principle, an increase in the fluid's velocity results in a decrease in pressure. Options C and D are incorrect because viscosity is an inherent property of the fluid and does not change with flow conditions in a meter.
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About Bernoulli's Equation
Bernoulli’s equation applies conservation of energy to steady flow of an incompressible, non-viscous fluid along a streamline: pressure, kinetic and gravitational terms have a constant total. It explains pressure-speed changes in narrow pipes, Venturi meters and lift, and differs from continuity because it relates pressure as well as velocity and height.
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