Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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A Barometer Kept in an Elevator Accelerating Upward Reads 76 Cm. the Air Pressure in the Elevator is - Physics

MCQ

A barometer kept in an elevator accelerating upward reads 76 cm. The air pressure in the elevator is

Options

  • 76 cm

  • < 76 cm

  • > 76 cm

  • zero

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Solution

> 76 cm

When the elevator is going upwards with acceleration a, the effective acceleration is a' =(g + a).
Thus, pressure is given by
P = hρ(g + a)
Air pressure in the elevator = P = h'ρg
Because the pressure is the same, h' > h.
∴ Air pressure > 76 cm

  Is there an error in this question or solution?
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APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 13 Fluid Mechanics
MCQ | Q 10 | Page 272
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