Effects of Heat


Temperature and Heat I - Concepts
Class - 7th Foundation NTSE Subjects
 
 
Concept Explanation
 

Effects of Heat

 Effects of heat:

  •  Heat can change the state from Solid to liquid and From Liquid to gas.
  •  Heat can burn things which is a chemical change.
  •  Excessive Heat kills the organisms.
  • Heat Causes Expansion:

    When we heat a substance the energy of the molecules increases, they move away a bit more hence they occupy more space. In liquids molecules move more freely than in solids, when they are heated their movements increases more than in solids. A liquid expands more than solid. Similarly, gases expand more than liquids.

    Expansion in everyday life:

  • The floor is laid out in rectangular pieces, sometime glass is placed between them to allow expansion.
  • Gaps are left between lengths of railway tracks to allow expansion in summers.
  • Gaps are left in the steel structure of bridges to allow expansion. Sometimes they are made to rest on rollers, so that they do not bend on expansion
  • Electric wire between poles sag during summer and become tight in winter because of expansion due to heat.
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    Sample Questions
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    Question : 1

    Heat can change the state from Solid to ______________________ .

    Right Option : B
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    Question : 2

    In the transmission of electricity  ______________________ between poles sag during summer and become tight in winter because of expansion due to heat.

    Right Option : C
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    Question : 3

    Which of the following are correct ?

    (a) Heat can burn things which is a physical change .

    (b) The temperature rises with heat and as an object is heated it gains energy.

    (c) Excessive heat kills the organisms.

    Right Option : B
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