Revision : Mixtures and separation

1. A mixture of salt and water is an example of:
   a) Element
   b) Compound
   c) Mixture
   d) Alloy

2. Which method is used to separate insoluble solids from liquids?
   a) Distillation
   b) Filtration
   c) Evaporation
   d) Sublimation

3. The process of converting a liquid into vapor is called:
   a) Condensation
   b) Filtration
   c) Evaporation
   d) Decantation

4. Which of the following is a homogeneous mixture?
   a) Sand and water
   b) Oil and water
   c) Sugar solution
   d) Soil

5. The technique used to separate cream from milk is:
   a) Churning
   b) Filtration
   c) Sublimation
   d) Sedimentation

6. Which method is suitable for separating iron filings from sand?
   a) Handpicking
   b) Magnetic separation
   c) Sieving
   d) Winnowing

7. The particles of a colloid can be seen by:
   a) Naked eye
   b) Microscope only
   c) Tyndall effect
   d) Evaporation

8. Which of the following is a suspension?
   a) Salt solution
   b) Milk
   c) Muddy water
   d) Air

9. The process of settling down of heavier insoluble particles is called:
   a) Decantation
   b) Sedimentation
   c) Filtration
   d) Distillation

10. Which method is used to obtain pure water from salt water?
    a) Sieving
    b) Distillation
    c) Winnowing
    d) Magnetic separation

11. A solution in which no more solute can dissolve is called:
    a) Dilute solution
    b) Unsaturated solution
    c) Saturated solution
    d) Colloid

12. The component present in smaller amount in a solution is called:
    a) Solvent
    b) Solute
    c) Residue
    d) Filtrate

13. Which separation method is based on difference in boiling points?
    a) Filtration
    b) Distillation
    c) Sieving
    d) Handpicking

14. Which of the following shows the Tyndall effect?
    a) True solution
    b) Colloid
    c) Pure water
    d) Sugar solution

15. The process used to separate grains from stalks is called:
    a) Threshing
    b) Winnowing
    c) Sieving
    d) Churning

16. Which method is used to separate husk from grains?
    a) Filtration
    b) Winnowing
    c) Distillation
    d) Sedimentation

17. Air is classified as:
    a) Compound
    b) Element
    c) Homogeneous mixture
    d) Suspension

18. Which method is commonly used to separate different pigments from ink?
    a) Sublimation
    b) Chromatography
    c) Sedimentation
    d) Distillation

19. The liquid that passes through the filter paper is called:
    a) Residue
    b) Sediment
    c) Filtrate
    d) Solute

20. Which of the following substances sublimes on heating?
    a) Sand
    b) Salt
    c) Ammonium chloride
    d) Iron filings