JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 4 September 2020, Shift 1, Physics Q6

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

A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s

^{-2}

. The density of water is 1 gm cm

^{-3}

and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980 cm/s

^2

(1)1.52 gm
(2)3.15 gm
(3)4.15 gmOfficial answer
(4)4.51 gm

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Mechanical Properties of Fluids
Topic: Fluid Statics
Idea tested: Archimedes' Principle

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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.