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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumData or graph

JEE Main 24 June 2022, Shift 2, Physics Q60

Question 60 of 90 in this shift, Physics question 30 of 30, Section B.

In an experiment to verify Newton’s law of cooling, a graph is plotted between, the temperature difference (Δ\DeltaT) of the water and surroundings and time as shown in figure. The initial temperature of water is taken as 80∘^{\circ}C. The value of t2_2 as mentioned in the graph will be ______.

The figure, in words

Graph of ΔT(∘C)\Delta T(^{\circ}C) on the vertical axis (ticks 60, 40, 20) against Time (minute) on the horizontal axis (marks 0, 6, t2_2); a smooth decreasing curve starting near 60 and flattening toward the axis; a solid horizontal line runs from 40 on the vertical axis to the curve and a vertical line drops from there to 6; a dashed horizontal line runs from 20 on the vertical axis across to the curve and a vertical line drops from the curve to t2_2.

Official answer

16

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Thermal Radiation
Idea tested
Logarithmic Graph of Newton's Law of Cooling

Same idea in other shifts

Asked 2× in all
  1. 4 Aug 2021, Shift 2 · Q15Which is the correct graph to explain the Newton’s law of cooling. T and T0\mathrm{T_0} are the temperatures of hot body and surrounding…EasyDiagram basedHas a figure

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.