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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumCalculation

JEE Main 8 January 2020, Shift 2, Physics Q6

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

Two liquids of densities ρ1\rho_1 and ρ2(ρ2=2ρ1)\rho_2(\rho_2=2\rho_1) are filled up behind a square wall of side 10 m10\ \mathrm{m} as shown in figure. Each liquid has a height of 5 m5\ \mathrm{m}. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing) :

The figure, in words

A vertical wall line with points M (top), N (middle) and O (bottom) marked on it; liquid shown to its left as dashed horizontal lines, an upper layer (MN) and a lower layer (NO) separated by a solid horizontal line at N. Double-headed arrows to the right of the wall labelled '5 m' for MN and '5 m' for NO.
  1. (1)2/32/3
  2. (2)1/21/2
  3. (3)1/31/3
  4. (4)1/41/4Official answer

Official answer

Option 4

NTA final key (Jan 2020).

Chapter
Mechanical Properties of Fluids
Topic
Fluid Statics
Idea tested
Force on Vertical Walls

Same topic in other shifts

All Fluid Statics questions
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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.