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Concepts Of Physics MCQ Edition [Volume 1]PhysicsFluid Mechanics

A beaker containing a liquid is placed inside a large closed jar. If the air within the jar is continuously pumped out, the pressure in the liquid near the bottom will

Options

  1. Afirst decrease and then increase
  2. Bremain constant
  3. Cincrease
  4. Ddecrease

Correct answer

D. decrease

Step-by-step solution

The pressure at a depth h near the bottom of the liquid is given by: P = P₀ + g h where P₀ is the pressure of the air inside the closed jar, is the density of the liquid, and g is the acceleration due to gravity. As the air within the jar is continuously pumped out, the pressure of the air P₀ above the liquid surface decreases. Since P₀ decreases and the term g h remains constant (assuming the height of the liquid does not change significantly), the total pressure P near the bottom of the liquid will decrease.

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