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9.1 , fluid mechanics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.1 , fluid mechanics1 Mark
MCQ
A body floats in a liquid contained in a beaker. If the whole system as shown in figure falls freely under gravity, then the upthrust on the body due to liquid is
  • ✓
    Zero
  • B
    Equal to the weight of liquid displaced
  • C
    Equal to the weight of the body in air
  • D
    None of these
✓

Answer

Correct option: A.
Zero
a
(a) Up thrust on the body $ = v\sigma \;g$. For freely falling body effective $g$ becomes zero. So up thrust becomes zero

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