JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 3 August 2021, Shift 2, Physics Q20

Question 20 of 90 in this shift, Physics question 20 of 30, Section A.

A block of mass 4.0 kg is pulled up on a smooth incline of angle

30^\circ

with the horizontal. If the block moves with an acceleration of 1.0 m/s

^2

, the power delivered by the pulling force at a time 3.0 s after the motion starts is

(1)70.8 WOfficial answer
(2)35.4 W
(3)65.4 W
(4)85.4 W

Official answer

Option 1

NTA final key.

Chapter: Work, Energy and Power
Topic: Power
Idea tested: Instantaneous Power

Same topic in other shifts

All Power questions

4 Apr 2026, Shift 1 · Q49A body of mass $2$ kg begins to move under the influence of time dependent force $\vec{F}=\left(2t\,\hat{i}+6t^2\,\hat{j}\right)$ N, where…MediumNumerical value
7 Apr 2025, Shift 1 · Q28An object of mass 1000 g experiences a time dependent force $\vec{F} = \left(2t\,\hat{i} + 3t^2\,\hat{j}\right)\mathrm{N}$ . The power…MediumSingle correct
31 Jan 2024, Shift 2 · Q35A body of mass 2 kg begins to move under the action of a time dependent force given by $\vec{F}=\left(6t\,\hat{i}+6t^2\,\hat{j}\right)$ N.…MediumSingle correct
18 Mar 2021, Shift 1 · Q2A constant power delivering machine has towed a box, which was initially at rest, along a horizontal straight line. The distance moved by…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.