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Friday, 9 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 28 July 2022, Shift 1, Physics Q34

Question 34 of 90 in this shift, Physics question 4 of 30, Section A.

A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).
  1. (1)3
  2. (2)9Official answer
  3. (3)12
  4. (4)18

Official answer

Option 2

NTA final key (2022 Session 2).

Chapter
Laws of Motion
Topic
Newton's Laws of Motion
Idea tested
Momentum Formulation (F = dp/dt)

Same idea in other shifts

Asked 2× in all
  1. 11 Apr 2023, Shift 1 · Q49An average force of 125 N is applied on a machine gun firing bullets each of mass 10 g at the speed of 250 m/s to keep it in position. The…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.