CBSE  /  Class 9  /  Science  /  Is Matter Around Us Pure

  • 1. 
    Rusting of an article made up of iron is called

  • corrosion and it is a physical as well as chemical change
  • dissolution and it is a physical change
  • corrosion and it is a chemical change
  • dissolution and it is a chemical change

  • 2. 
    A mixture of sulphur and carbon disulphide is

  • heterogeneous and shows Tyndall effect
  • homogeneous and shows Tyndall effect
  • heterogeneous and does not show Tyndall effect
  • homogeneous and does not show Tyndall effect

  • 3. 
    Tincture of iodine has antiseptic properties. This solution is made by dissolving

  • iodine in potassium iodide
  • iodine in vaseline
  • iodine in water
  • iodine in alcohol

  • 4. 
    Blood and sea water are

  • both mixtures
  • both are compounds
  • blood is a mixture whereas sea water is a compound
  • blood is a compound and sea water is a mixture

  • 5. 
    Sol and gel are examples of

  • Solid-solid colloids
  • Sol is a solid-liquid colloid and gel is liquid solid colloid
  • Sol is solid-solid colloid and gel is solid-liquid colloid
  • Sol is a liquid-solid colloid and gel is a solid-liquid colloid

  • 6. 
    In a water-sugar solution

  • water is solute and sugar is solvent
  • water is solvent and sugar is solute
  • water is solute and water is also solvent
  • none of these

  • 7. 
    Boron and carbon are

  • metalloids
  • metalloid and non-metal respectively
  • metal
  • non-metal and metalloid respectively

  • 8. 
    Which of the following methods would you use to separate cream from milk?

  • Fractional distillation
  • Distillation
  • Centrifugation
  • Filtration

  • 9. 
    Cooking of food and digestion of food:

  • are both physical processes
  • are both chemical processes
  • cooking is physical whereas digestion is chemical
  • cooking is chemical whereas digestion is physical

  • 10. 
    Mercury and bromine are both

  • liquid at room temperature
  • solid at room temperature
  • gases at room temperature
  • both (a) and (b)
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