Separation of substances Class 6 Science Multiple Choice Questions & Answers

Question-1. To evaporate a liquid into its vapour, heat the liquid below its

1. Above its melting point
2. Below its boiling point
3. Below its melting point
4. Above its boiling point

Question-2. Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

1. Add sugar before cooling.
2. Add sugar after cooling
3. There will be no difficulty in dissolving sugar in either cold water or in hot water.
4. On adding ice the taste of the lemonade will change.

Question-3. Cotton fibre is separated from cotton seeds by the process of

1. Churning
2. Boiling
3. Colouring
4. Ginning

Question-4. A pure solid is obtained from its solution by the process of

1. Condensation
2. decantation
3. Sedimentation
4. Filtration

Question-5. Paneer is separated from curdled milk

1. Condensation
2. Filtration
3. evaporation
4. sedimentation

Question-6. A saturated solution can dissolve more of a substance on

1. Cooling
2. Heating
3. Condensing
4. Evaporating

Question-7. Separation of kerosene oil and water is done by

1. Decantation
2. Filtration
3. Condensation
4. Crystallisation

Question-8. The method that is used to obtain pure salt from impure salt

1. Decantation
2. Crystallization
3. Evaporation
4. Condensation

Question-9. The process due to which steam changes into liquid state on cooling

1. Decantation
2. Sedimentation
3. Filtration
4. Evaporation

Question-10. The process of making particles of mud heavy with alum

1. Decantation
2. loading
3. Filtration
4. Condensation

Question-11. The separation technique used to separate a solid-solid mixture is ____.

1. Decantation
2. Evaporation
3. Filtration
4. Handpicking

Question-12. Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called ___________.

1. Decantation
2. Filtration
3. Sedimentation followed by decantation
4. Evaporation

Question-13. The method of separating seeds of paddy from its stalks is called ___________.

1. Decantation
2. Winnowing
3. Threshing
4. Sedimentation

Question-14. Principle behind winnowing is

1. Difference in densities of components
2. Difference in colours of components
3. Difference in appearance of components
4. Difference in shapes of components

Question-15. The method used to separate a dissolved solid component from its solution

1. Evaporation
2. Filtration
3. sedimentation
4. Decantation

Question-16. The process of separating the constituents of a liquid by agitating it vigorously

1. Evaporation
2. Churning
3. Filtration
4. Sedimentation

Question-17. The technique that separates a liquid from an insoluble solid by carefully pouring off the liquid is called ____.

1. Evaporation
2. Decantation
3. Filtration
4. Distillation

Question-18. A mixture of sugar and water can be separated by

1. Filtration
2. Evaporation
3. Separating funnel
4. decantation

Question-19. Butter is separated from curd by the process of

1. Filtration
2. Heating
3. Churning
4. Sieving

Question-20. Separating the insoluble suspended solids of various sizes from a liquid is called

1. Filtration
2. Crystallization
3. Evaporation
4. Condensation

Question-21. The process of increasing the rate of sedimentation in a suspension by adding some chemical is

1. Filtration
2. Crystallisation
3. Loading
4. Condensation

Question-22. Salt is obtained from sea water by drying it in the sun. The process is known as -_________.

1. Filtration
2. Evaporation
3. Sedimentation
4. Condensation

Question-23. Methods used to separate a mixture of salt and sand is by treating the mixture with water and then:

1. Filtration followed by evaporation
2. Sedimentation followed by evaporation
3. Filtration followed by condensation
4. None of the above.

Question-24. When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ___________.

1. Hand picking
2. Filtration
3. Churning
4. Sedimentation

Question-25. Alum is added to muddy water to

1. Hasten sedimentation rate
2. Remove colour
3. Kill bacteria
4. Impart a sweet taste

Question-26. The addition of bleaching powder to the water

1. Kills the microorganism
2. Feeds the microorganisms
3. Helps the microorganisms to grow
4. None of these

Question-27. Rain water is a kind of

1. saline water
2. distilled water
3. carbonated water
4. saturated water

Question-28. The rate of sedimentation is increased by adding ____ to the water.

1. Salt
2. Sugar
3. Alum
4. Soap

Question-29. Corn is separated from husk by the process of

1. Sieving
2. Winnowing
3. Churning
4. Handpicking

Question-30. Suppose you are making some tea, and have boiled water and added tea leaves to the water. Then you realize that you cannot find the strainer. You look for a clean piece of cloth, but do not find one. What method would you like to apply for a cup of tea without leaves

1. Sieving
2. Evaporation
3. Decantation
4. Filtration

Question-31. A solution which cannot dissolve more of a given substance at a given temperature is

1. Solution
2. Filtrate
3. Saturated solution
4. Unsaturated solution

Question-32. The method used to separate sand and saw dust is:

1. Threshing
2. Winnowing
3. Hand- picking
4. Magnetic separation

Question-33. This harmful microbe in water causes typhoid and jaundice

1. Virus
2. Bacteria
3. Algae
4. Fungi

Question-34. The clear liquid obtained after filtration is called

1. Water
2. Filtrate
3. Solution
4. Residue

Question-35. The process followed to separate grains form the stalks is called

1. Winnowing
2. Threshing
3. Sieving
4. Hand picking