JEE Main 2023 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 11 April 2023, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

An 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 number of bullets fired per second by the machine gun is :

(1)5
(2)100
(3)50Official answer
(4)25

Official answer

Option 3

NTA final key.

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
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
28 Jul 2022, Shift 1 · Q34A 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…MediumSingle 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.