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Friday, 9 October

JEE Main 2024 · PhysicsMultiple choiceDiagram basedEasyData or graph

JEE Main 30 January 2024, Shift 2, Physics Q37

Question 37 of 90 in this shift, Physics question 7 of 30, Section A.

A block of ice at −10∘C-10^\circ C is slowly heated and converted to steam at 100∘C100^\circ C. Which of the following curves represent the phenomenon qualitatively:

The figure, in words

Four temperature vs heat-supplied graphs given as options (all four options are figures).
  1. (1)[figure: graph of Temperature vs Heat supplied, starting at origin; rises, flat plateau, rises, then flat horizontal end]Official answer
  2. (2)[figure: graph of Temperature vs Heat supplied, starting on the heat axis away from origin; rises, flat plateau, then rises]
  3. (3)[figure: graph of Temperature vs Heat supplied, starting at origin; short rise, then vertical jump to a plateau, then rises]
  4. (4)[figure: graph of Temperature vs Heat supplied, starting on the heat axis away from origin; rises, flat plateau, vertical jump to a higher plateau, then rises]

Official answer

Option 1

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Calorimetry
Idea tested
Heating and Cooling Curves

Same idea in other shifts

Asked 2× in all
  1. 25 Jul 2021, Shift 1 · Q14Two different metal bodies A and B of equal mass are heated at a uniform rate under similar conditions. The variation of temperature of…MediumSingle correctHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.