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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 4 August 2021, Shift 1, Physics Q20

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

In the given figure, S is a spot light, it rotates in a horizontal plane with a constant angular velocity of 0.1 rad/s. The velocity of spot P will be given by

The figure, in words

A point S at the left; a solid horizontal line of length labelled 5m runs from S's level to a vertical hatched wall labelled 'wall' on the right; a dashed line runs from S up to a point P on the wall (P above the horizontal line). An angle labelled 30° is marked at P.
  1. (1)0.1 m/s
  2. (2)0.5 m/s
  3. (3)2 m/sOfficial answer
  4. (4)5 m/s

Official answer

Option 3

NTA final key.

Chapter
Motion in a Plane
Topic
Kinematics in 2D
Idea tested
Angular to Linear Kinematics Conversion

Same topic in other shifts

All Kinematics in 2D questions
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  2. 8 Apr 2024, Shift 1 · Q51Three vectors OP→\overrightarrow{OP}, OQ→\overrightarrow{OQ} and OR→\overrightarrow{OR} each of magnitude AA are acting as shown in figure.…EasyNumerical valueHas a figure
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  4. 27 Jan 2024, Shift 1 · Q51A particle starts from origin at t = 0 with a velocity 5 i^5\,\hat{i} m/s and moves in xx-yy plane under action of a force which produces…MediumNumerical value
  5. 30 Jan 2024, Shift 2 · Q51A vector has magnitude same as that of A⃗=3i^+4j^\vec{A} = 3\hat{i} + 4\hat{j} and is parallel to B⃗=4i^+3j^\vec{B} = 4\hat{i} + 3\hat{j}. The xx and yy…EasyNumerical value
  6. 31 Jan 2024, Shift 1 · Q51A body starts falling freely from height HH hits an inclined plane in its path at height hh. As a result of this perfectly elastic…HardNumerical value

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.