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Matter in Our Surroundings — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings1 Mark
Question
A thermometer is inserted into a beaker filled with ice at 0∘C. The beaker is heated slowly. The temperature does not rise for some time. This is because:
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Answer

  1. Heat was used for changing ice at 0∘C to water at 0∘C
Explanation:
The temperature does not rise for some time because heat was used for changing ice at 0∘C to water at 0∘C.
When heat is given to solid ice, it first absorbs energy to convert into liquid water.
After some time, when it converts into liquid water, temperature starts increasing.

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