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Matter Around Us. — Science STD 8 — Question

Tamilnadu BoardEnglish MediumSTD 8ScienceMatter Around Us.2 Marks
MCQ
Give reasons for the following.
  • A
    Aluminum foils are used to wrap food items.
  • B
    Immersion rods for heating liquids are made up of metallic substances.
  • C
    Sodium and potassium are stored in kerosene.
  • D
    Mercury is used in thermometers.
✓

Answer

  1. Aluminium is malleable, soft and does not react with food items, so it is used to wrap food items.
  2. Metals are good conductor of heat and electricity, so immersion rods are made up of metallic substances.
  3. Sodium and potassium are very reactive, they react with air and water, so they are stored in kerosene.
  4. Mercury is used in thermometers and barometers because of its high density and uniform expansion at different temperature.

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