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9th Class Science Matter in Our Surroundings Question Bank Matter in Our Surroundings

  • question_answer
    Direction: Study the given graph carefully and answer the following question.
     
    What is represented by straight lines QR and ST in the graph?

    A) Temperature remains same during the change of state.

    B) OR represents latent heat of fusion, while ST represents latent heat of vaporisation.

    C) At QR, matter exists in both solid and liquid states, while at ST matter exists in both liquid and gaseous states.

    D) All of these.

    Correct Answer: D

    Solution :

    At QR (273 K), inter conversion of solid to liquid takes place so, matter exists in both solid and liquid states and it represents latent heat of fusion. At ST(373 K), inter conversion of liquid to gas takes place so, matter exists in both liquid and gaseous states and it represents latent heat of vaporisation. Temperature remains constant at OR and ST.


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