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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 3 September 2020, Shift 2, Physics Q2

Question 2 of 75 in this shift, Physics question 2 of 25.

A particle is moving unidirectionally on a horizontal plane under the action of a constant power supplying energy source. The displacement (s) - time (t) graph that describes the motion of the particle is (graphs are drawn schematically and are not to scale) :

The figure, in words

Each option is a schematic s (vertical axis) versus t (horizontal axis) graph; no numerical values.
  1. (1)[figure: s-t graph, straight line rising from the origin]
  2. (2)[figure: s-t graph, horizontal line at a constant s value, not touching the t axis]
  3. (3)[figure: s-t graph, curve starting at the origin with a small slope and rising ever more steeply]Official answer
  4. (4)[figure: s-t graph, curve starting at the origin rising steeply and flattening out as t increases]

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Work, Energy and Power
Topic
Power
Idea tested
Kinematics of Constant Power

Same idea in other shifts

Asked 4× in all
  1. 5 Apr 2024, Shift 2 · Q35A body is moving unidirectionally under the influence of a constant power source. Its displacement in time t is proportional to :MediumSingle correct
  2. 3 Aug 2021, Shift 1 · Q4A constant power is fed to an object, starting from rest, moving along a straight line. The distance travelled by the body in time tt is…MediumSingle correct
  3. 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.