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JEE Main 2026 (28 Jan, Shift 1) · Calorimetry, Latent Heat & Mechanical Equivalent of Heat

Calorimetry, Latent Heat & Mechanical Equivalent of Heat question from JEE Main 2026 (28 Jan, Shift 1)

Q1JEE Main 2026 · 28 JAN · SHIFT 1Easy

Calorimetry, Latent Heat & Mechanical Equivalent of Heat

Which of the following best represents the temperature versus heat supplied graph for water, in the range of −20∘C-20^{\circ}\text{C} to 120∘C120^{\circ}\text{C}?

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Answer: (c)

0100meltingboilingHeatT (°C)
  1. Ice warms from −20∘C-20^{\circ}\text{C} to 0∘C0^{\circ}\text{C}: temperature rises.
  2. At 0∘C0^{\circ}\text{C} ice melts: flat part (latent heat of fusion).
  3. Water warms from 0∘C0^{\circ}\text{C} to 100∘C100^{\circ}\text{C}: rises, then flat at 100∘C100^{\circ}\text{C} while it boils.
  4. Steam then warms to 120∘C120^{\circ}\text{C}: rises again. Only graph (c) has flat parts at both 0∘C0^{\circ}\text{C} and 100∘C100^{\circ}\text{C}.
  5. So the answer is (c).
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