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JEE Main 2011
Exam
JEE Main
Year
2011
Subject
Physics
Chapter
Thermal Properties of Matter

JEE Main 2011 · Physics · Thermal Properties of Matter

100 ~g of water is heated from 30^ C to 50^ C . Ignoring the slight...

100 g100 \mathrm{~g} of water is heated from 30∘C30^{\circ} \mathrm{C} to 50∘C50^{\circ} \mathrm{C}. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/kg/K4148 \mathrm{~J} / \mathrm{kg} / \mathrm{K} ):

Options

  1. A8.4 kJ8.4 \mathrm{~kJ}
  2. B84 kJ84 \mathrm{~kJ}
  3. C2.1 kJ2.1 \mathrm{~kJ}
  4. D4.2 kJ4.2 \mathrm{~kJ}

Correct answer

A. 8.4 kJ8.4 \mathrm{~kJ}

Step-by-step solution

ΔQ=ΔU+ΔW\Delta \mathrm{Q}=\Delta \mathrm{U}+\Delta \mathrm{W} (ignoring expansion) Δ\Delta\mathrm{U}=\mathrm{ms}ΔT=0.1×4.184×20=8.368 kJ\Delta \mathrm{T}=0.1 \times 4.184 \times 20=8.368 \mathrm{~kJ}
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