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)3
(2)9Official answer
(3)12
(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 7× in all

5 Apr 2024, Shift 2 · Q34A particle moves in $x$ - $y$ plane under the influence of a force $\vec{F}$ such that its linear momentum is…MediumSingle correct
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
13 Apr 2023, Shift 1 · Q35A bullet of 10 g leaves the barrel of gun with a velocity of 600 m/s. If the barrel of gun is 50 cm long and mass of gun is 3 kg, then…EasySingle correct
15 Apr 2023, Shift 1 · Q40The position vector of a particle related to time $t$ is given by $\vec{r} = (10t\hat{i} + 15t^2\hat{j} + 7\hat{k})\,m$ The direction of…EasySingle correct
26 Jul 2022, Shift 2 · Q33A ball of mass 0.15 kg hits the wall with its initial speed of $12\ \text{ms}^{-1}$ and bounces back without changing its initial speed.…EasySingle correct
4 Aug 2021, Shift 2 · Q18The position time relation of a body of mass 0.02 kg is given by (one-dimensional motion) x = 9 cm (for t = 3, 9, 15, 21s ..........) x =…MediumSingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.