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Heat Transfer

Which of the ...

Question

Which of the following statements is correct about the given graph?

A

Temperature remains same during the change of state

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B

QR represents latent heat of fusion while ST represents latent heat of vaporisation

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C

At QR, substance exists in both solid and liquid states while at ST, it exists in both liquid and gaseous states

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D

All the statements are true

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Solution

The correct option is D All the statements are true
As we know, the temperature remains the same during state change and from the figure it can be seen that.

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Q. The amount of heat required to change from liquid state to gaseous state without rise in its temperature is called latent heat of vaporisation.

Q. The graph shows the variation of temperature (T ) of one kilogram of a material with the heat (H) supplied to it. At O, the substance is in the solid state rom the graph, we can conclude that

Q. For many substances, there exists a temperature

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T_{t r} = {0.0075}^{\circ} C

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λ = 0.34 \times 10^{3} k J / k g

.
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