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JEE Main 9 January 2020, Shift 1, Physics Q6

Question 6 of 75 in this shift, Physics question 6 of 25, Section A.

Water flows in a horizontal tube (see figure). The pressure of water changes by

700\ \mathrm{Nm^{-2}}

between A and B where the area of cross section are

40\ \mathrm{cm^{2}}

and

20\ \mathrm{cm^{2}}

, respectively. Find the rate of flow of water through the tube. (density of water

=1000\ \mathrm{kgm^{-3}}

)

The figure, in words

A horizontal tube drawn with dashed horizontal lines inside it (flow lines); the tube is wide at the left where point A is marked with a dot, narrows to a constriction where point B is marked with a dot, then widens again to the right. Caption (Fig) below.

(1) $1810\ \mathrm{cm^{3}/s}$
(2) $2420\ \mathrm{cm^{3}/s}$
(3) $2720\ \mathrm{cm^{3}/s}$ Official answer
(4) $3020\ \mathrm{cm^{3}/s}$

Official answer

Option 3

NTA final key (Jan 2020).

Chapter: Mechanical Properties of Fluids
Topic: Fluid Dynamics
Idea tested: Venturi Meter Principles

JEE Main 9 January 2020, Shift 1, Physics Q6

Same idea in other shifts