When an aeroplane is flying, the air moves from the top and the bottom of the wings. The air moving over the top of the wings is faster due to which the pressure above the wings will
Correct answer: A. Be low.
- A. Be low.
- B. Be high.
- C. Be zero.
- D. Vary unpredictably.
Explanation
The correct answer is that the pressure above the wings will be low. This is due to Bernoulli's principle, which states that as the speed of a fluid (in this case, air) increases, the pressure within the fluid decreases. The faster air flow over the top of the wings results in lower pressure compared to the slower air flow below the wings. This difference in pressure creates lift, allowing the aeroplane to fly. The other options are incorrect because they either misunderstand the principle (suggesting high pressure or zero pressure) or incorrectly suggest unpredictability in a well-understood phenomenon.
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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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