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9.1 , fluid mechanics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics9.1 , fluid mechanics1 Mark
MCQ
A barometer is constructed using a liquid (density $\left.=760 \;kg / m ^{3}\right) .$ What would be the height  (In $m$) of the liquid column, when a mercury barometer reads $76 \;cm ?$ (density of mercury $\left.=13600 \;kg / m ^{3}\right)$
  • A
    $0.76$
  • B
    $1.36$
  • ✓
    $13.6$
  • D
    $136$
✓

Answer

Correct option: C.
$13.6$
c
Pressure, $P=h d g$

Reading of mercury barometer, $h=76 cm$

Reading of liquid barometer $= h ^{\prime}$

$h ^{\prime} d _{i} g = h d _{ hg } g$

$h ^{\prime}=\frac{76 \times 13600}{760}=1360 cm$

$=13.6 m$

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