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NEET Sample Paper NEET Sample Test Paper-27

  • question_answer
    How does the internal energy change when the ice and wax melt at their normal melting points?

    A)  Increase for ice, decrease for wax

    B)  Increase for wax, decrease for ice

    C)  Decrease for both ice and wax

    D)  Increase for both ice and wax.

    Correct Answer: A

    Solution :

    From the relation \[\Delta U=\Delta \theta -P\Delta V\] wax expand on melting, so \[P\Delta V\]is positive hence \[\Delta V\] decreases. But ice contracts in melting so, \[P\Delta V\]is negative and \[\Delta U\] increases.


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