A solid substance is at 30 °C. To this substance heat energy is supplied at a constant rate. Then temperature versus time graph….

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Q: A solid substance is at 30 °C. To this substance heat energy is supplied at a constant rate. Then temperature versus time graph is as shown in the figure. The substance is in liquid state for the portion (of the graph)

Numerical

(a) BC

(b) CD

(c) ED

(d) EF

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Ans: (b)

 

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