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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 8 January 2020, Shift 1, Physics Q7

Question 7 of 75 in this shift, Physics question 7 of 25, Section A.

A leak proof cylinder of length 1 m, made of a metal which has very low coefficient of expansion is floating vertically in water at 0∘0^\circC such that its height above the water surface is 20 cm. When the temperature of water is increased to 4∘4^\circC, the height of the cylinder above the water surface becomes 21 cm. The density of water at T=4∘T = 4^\circC, relative to the density at T=0∘T = 0^\circC is close to :
  1. (1)1.04
  2. (2)1.01Official answer
  3. (3)1.26
  4. (4)1.03

Official answer

Option 2

NTA final key (Jan 2020).

Chapter
Mechanical Properties of Fluids
Topic
Fluid Statics
Idea tested
Temperature Effects on Buoyancy

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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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.