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ICSE Class 9 Physics Question 1 of 19

Pressure in Fluids and Atmospheric Pressure — Question 7

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Question

Question 7

The pressure on a surface is reduced by :

  1. using high thrust
  2. increasing the area of surface
  3. decreasing the area of surface
  4. none of these
Answer

increasing the area of surface

Reason — Larger the area on which a given thrust acts, lesser is the pressure exerted by it, as pressure is inversely proportional to the area of surface.

Pressure=ThrustAreaorP=FA\text{Pressure} = \dfrac{\text{Thrust}}{\text{Area}} \\[0.5em] \text{or} \\[0.5em] \text P = \dfrac{\text{F}}{\text{A}}