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Warm up

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  • How does perspiration in summer keep our bodies cool?
    When we perspire, the heat from the body is used to evaporate the sweat, thus making our bodies cool.
  • The working of a bimetallic strip is based on which principle?
    Unequal expansion rates of solids
  • An iron washer is heated. State its effect on the inner diameter, mass and density
    inner diameter increases, mass and density remains the same
  • Name any one factor affecting cubical expansion of liquids
    nature of liquid, rise in temperature, original volume of the liquid
  • Among the three states of matter: solids, liquids and gases, which state of matter expands the least?
    solid
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