Learn

Friday, 9 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

Same topic in other shifts

All Fluid Statics questions
  1. 2 Apr 2026, Shift 1 · Q50A tub is filled with water and a wooden cube 10 cm×10 cm×10 cm10\ \mathrm{cm}\times10\ \mathrm{cm}\times10\ \mathrm{cm} is placed in the water. The…EasyNumerical value
  2. 2 Apr 2025, Shift 1 · Q47A vessel with square cross-section and height of 6 m is vertically partitioned. A small window of 100 cm2100\ \mathrm{cm}^2 with hinged door is…MediumNumerical value
  3. 9 Apr 2024, Shift 1 · Q37A sphere of relative density σ\sigma and diameter D has concentric cavity of diameter d. The ratio of Dd\frac{D}{d}, if it just floats on…MediumSingle correct
  4. 8 Apr 2023, Shift 2 · Q35A hydraulic automobile lift is designed to lift vehicles of mass 5000 kg. The area of cross section of the cylinder carrying the load is…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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.