One end of a uniform glass capillary tube of radius$r = 0.025{\rm{cm}}$ is immersed vertically in water to a depth $h = 1{\rm{cm}}$. The excess pressure in ${\rm{N}}{{\rm{m}}^{ - 2}}$ required to blow an air bubble out of the tube (Surface tension of water = $7 \times {10^{ - 2}}{\rm{N}}{{\rm{m}}^{ - 1}}$, Density of water = ${10^3}{\rm{kg}}{{\rm{m}}^{ - 3}}$ , Acceleration due to gravity= 10${\rm{m}}{{\rm{s}}^{ - 2}}$

NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

1 Medium

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Application +4 | -1

One end of a uniform glass capillary tube of radius

r = 0.025\mathrm{cm}

is immersed vertically in water to a depth

h = 1\mathrm{cm}

. The excess pressure in

\mathrm{N}{\mathrm{m}^{ - 2}}

required to blow an air bubble out of the tube (Surface tension of water =

7 \times {10^{ - 2}}\mathrm{N}{\mathrm{m}^{ - 1}}

, Density of water =

{10^3}\mathrm{kg}{\mathrm{m}^{ - 3}}

, Acceleration due to gravity= 10

\mathrm{m}{\mathrm{s}^{ - 2}}

View answer and explanation

Correct option: B

0.0066 \times {10^5}

Option B (

0.0066 \times {10^5}

) is correct because the excess pressure is the sum of the hydrostatic pressure due to the depth and the pressure due to surface tension.

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4\mathrm{m}{\mathrm{s}^{ - 1}}