In a spray bottle, pressing the nozzle causes fast air flow, which:
Correct answer: B. creates low pressure to lift the liquid
- A. creates high pressure to lift the liquid
- B. creates low pressure to lift the liquid
- C. increases pressure at the tube opening
- D. reduces liquids surface tension
Explanation
Pressing the nozzle sends air rapidly across the top of the tube, and by Bernoulli's principle fast moving air has low pressure, so atmospheric pressure on the liquid pushes it up the tube. The process creates a pressure drop rather than high pressure, and surface tension plays no part.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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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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