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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Thermal Properties of Matter

NTA Abhyas 2020 · Physics · Thermal Properties of Matter

A heating curve has been plotted for a solid object as shown in the...

A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is 100g100g, then latent heat of vapourisation for the material of the object is [Given, power supplied to the object is constant and equal to 1kW1kW]

A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is 100g , then

Options

  1. A1.5×106J/kg1.5 \times {10}^{6}J / kg
  2. B2.5×106J/kg2.5 \times {10}^{6}J / kg
  3. C3.5×106J/kg3.5 \times {10}^{6}J / kg
  4. D9.0×106J/kg9.0 \times {10}^{6}J / kg

Correct answer

D. 9.0×106J/kg9.0 \times {10}^{6}J / kg

Step-by-step solution

The total heat supplied to the block is

∫16002500pdt=mLv{∫}_{1600}^{2500}pdt = m{L}_{v}

1000×(2500−1600)=0.1Lv1000 \times \left(2500 - 1600\right) = 0. 1{L}_{v}

Lv=9.0×106J/kg{L}_{v} = 9.0 \times {10}^{6 }J / kg

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