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Saturday, 31 October

JEE Main 2023 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 13 April 2023, Shift 1, Physics Q37

Question 37 of 90 in this shift, Physics question 7 of 30, Section A.

The figure shows a liquid of given density flowing steadily in horizontal tube of varying cross - section. Cross sectional areas at A is 1.5 cm21.5\ \mathrm{cm^2}, and B is 25 mm225\ \mathrm{mm^2}, if the speed of liquid at B is 60 cm/s then (PA−PB)(P_A - P_B) is : (Given PAP_A and PBP_B are liquid pressures at A and B points. density ρ=1000 kg m−3\rho = 1000\ \mathrm{kg\,m^{-3}} A and B are on the axis of tube

The figure, in words

Horizontal tube whose cross-section narrows from a wide left end to a thin right end, with dashed streamlines along it; point A marked on the axis in the wide part and point B on the axis in the narrow part.
  1. (1)27 Pa
  2. (2)175 PaOfficial answer
  3. (3)135 Pa
  4. (4)36 Pa

Official answer

Option 2

NTA final key.

Chapter
Mechanical Properties of Fluids
Topic
Fluid Dynamics
Idea tested
Bernoulli's Equation

Same idea in other shifts

Asked 5× in all
  1. 8 Apr 2026, Shift 2 · Q33A liquid of density 600 kg/m3^3 flowing steadily in a tube of varying cross-section. The cross-section at a point AA is 1.0 cm2^2 and…EasySingle correct
  2. 8 Apr 2024, Shift 1 · Q36Correct Bernoulli's equation is (symbols have their usual meaning) :EasySingle correct
  3. 26 Jun 2022, Shift 1 · Q60An ideal fluid of density 800 kgm−3\mathrm{kgm^{-3}}, flows smoothly through a bent pipe (as shown in figure) that tapers in cross-sectional…MediumNumerical valueHas a figure
  4. 6 Sep 2020, Shift 2 · Q7A fluid is flowing through a horizontal pipe of varying cross-section, with speed v ms−1v\,\mathrm{ms^{-1}} at a point where the pressure is P…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.