Water is moving with a speed of $5.18{\rm{m}}{{\rm{s}}^{ - 1}}$ through a pipe with a cross-sectional area of $4.20{\rm{c}}{{\rm{m}}^2}$. The water gradually descend 9.66 m as the pipe increase in area to $7.60{\rm{c}}{{\rm{m}}^2}$ . The speed of flow at the lower level is

$2.86{\rm{m}}{{\rm{s}}^{ - 1}}$

$3.82{\rm{m}}{{\rm{s}}^{ - 1}}$

JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Application +4 | -1

Water is moving with a speed of

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

through a pipe with a cross-sectional area of

4.20\mathrm{c}{\mathrm{m}^2}

. The water gradually descend 9.66 m as the pipe increase in area to

7.60\mathrm{c}{\mathrm{m}^2}

. The speed of flow at the lower level is

View answer and explanation

Correct option: D

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

Option D (

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

) is correct because it is calculated directly from the equation of continuity,

a_1v_1 = a_2v_2

Practice All Chapter MCQs →

80 \mathrm{~kg}

20 \mathrm{~cm}

0.5 \mathrm{~cm}

0.1 \mathrm{~cm}

15 \mathrm{~m} / \mathrm{s}

5 \mathrm{~m}

=10^{-2}

m_1

d_1

d_2

m_2