MCQ Questions for Class 6 Science: Ch 5 Separation of Substances
1. This harmful microbe in water causes typhoid and jaundice
(a) Virus
(b) Bacteria
(c) Algae
(d) Fungi
► (b) Bacteria
2. Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?
(a) A homogeneous mixture of solid and liquid
(b) A heterogeneous mixture of liquid and liquid
(c) A homogeneous mixture of liquid and liquid
(d) A heterogeneous mixture of solid and liquid
► (c) A homogeneous mixture of liquid and liquid
3. Chalk powder suspension in water can be separated by
(a) Filtration
(b) Evaporation
(c) Condensation
(d) Decantation
► (a) Filtration
4. A Identify the mixture from the following.
(a) Oxygen
(b) Carbon dioxide
(c) Hydrogen
(d) Air
► (d) Air
5. A solution which cannot dissolve more of a given substance at a given temperature is
(a) Solution
(b) Filtrate
(c) Saturated solution
(d) Unsaturated solution
► (c) Saturated solution
6. The method that is used to obtain pure salt from impure salt
(a) Decantation
(b) Evaporation
(c) Crystallization
(d) Condensation
► (c) Crystallization
7. Salt is obtained from sea water by using which of the following process.
(a) Sedimentation
(b) Condensation
(c) Evaporation
(d) Centrifugation
► (c) Evaporation
8. What kind of mixtures are alloys?
(a) Solid-Gas
(b) Liquid-Liquid
(c) Gas-Gas
(d) Solid-Solid
► (d) Solid-Solid
9. Which of the following statements about a mixture is TRUE?
(a) It is a pure substance.
(b) Its constituents are not combined chemically.
(c) Its constituents do not retain their individual properties.
(d) It is always homogeneous.
► (b) Its constituents are not combined chemically.
10. Identify the compound from the following.
(a) Oxygen
(b) Carbon dioxide
(c) Hydrogen
(d) Air
► (b) Carbon dioxide
11. In a mixture, constituents exhibit
(a) similar properties.
(b) only those properties which are characteristic to the mixture.
(c) their own properties.
(d) no properties.
► (c) their own properties.
12. The method used to separate a dissolved solid component from its solution
(a) Evaporation
(b) Filtration
(c) Sedimentation
(d) Decantation
► (a) Evaporation
13. Separation of kerosene oil and water is done by
(a) Decantation
(b) Filtration
(c) Condensation
(d) Crystallisation
► (a) Decantation
14. Cotton fibre is separated from cotton seeds by the process of
(a) Churning
(b) Boiling
(c) Colouring
(d) Ginning
► (d) Ginning
15. A pure substance is made of
(a) only one kind of atoms or molecules.
(b) two or more kinds of molecules.
(c) mixture of homogeneous substances
(d) all of the above
► (a) only one kind of atoms or molecules.
16. To evaporate a liquid into its vapour, heat the liquid ____
(a) Above its melting point
(b) Below its boiling point
(c) Below its melting point
(d) Above its boiling point
► (b) Below its boiling point
17. Butter is separated from curd by the process of
(a) Filtration
(b) Heating
(c) Churning
(d) Sieving
► (c) Churning
18. What type of a substance is steel?
(a) A solid - liquid heterogeneous mixture
(b) A solid - solid heterogeneous mixture
(c) A solid - solid homogeneous mixture
(d) A pure substance
► (c) A solid - solid homogeneous mixture
19. The properties used to separate two solids from a mixture by winnowing is
(a) Attraction by magnet.
(b) Difference in weight
(c) Difference is colour
(d) Difference in size
► (b) Difference in weight
20. Separating the insoluble suspended solids of various sizes from a liquid is called
(a) Filtration
(b) Crystallization
(c) Evaporation
(d) Condensation
► (a) Filtration
21. Rain water is a kind of
(a) Saline water
(b) Distilled water
(c) Carbonated water
(d) Saturated water
► (b) Distilled water
22. The dust particles in the water can be helped to settle down faster by using
(a) Alcohol
(b) Sugar
(c) Alum
(d) Common salt
► (c) Alum
23. The process of separating the constituents of a liquid by agitating it vigorously
(a) Evaporation
(b) Churning
(c) Filtration
(d) Sedimentation
► (b) Churning
24. The separation of grains from husk is done by the process of
(a) Hand picking
(b) Threshing
(c) Winnowing
(d) Sieving
► (c) Winnowing
25. A solution of salt is a
(a) Compound
(b) Heterogeneous solution
(c) Element
(d) Homogeneous solution
► (d) Homogeneous solution