Class 6 Science MCQ Separation of Substances

Question : Chalk powder suspension in water can be separated by

(a) Filtration
(b) Evaporation
(c) Condensation
(d) Decantation

Question : Sand from water is separated by

(a) sieving
(b) evaporation
(c) filtration
(d) sedimentation and decantation

Question : To separate husk from grains in a field by

(a) Tailor
(b) Grocer
(c) Watchman
(d) Farmers

Question : Threshing is done by

(a) beating
(b) animals
(c) machines
(d) all of these

Question : The process of conversion of water into its vapours is called

(a) evaporation
(b) condensation
(c) guttation
(d) transpiration

Question : The grains which are fall vertically down on the ground,

(a) Heavier
(b) Lighter
(c) Stronger
(d) None of these

Question : The method that is used to obtain pure salt from impure salt

(a) Decantation
(b) Evaporation
(c) Crystallization
(d) Condensation

Question : The process followed to separate grains form the stalks is called

(a) Winnowing
(b) Threshing
(c) Sieving
(d) Hand picking

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

(a) Filtration
(b) Crystallisation
(c) Loading
(d) Condensation

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

(a) Decantation
(b) Winnowing
(c) Threshing
(d) Sedimentation

Question : 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 ___________.

(a) Hand picking
(b) Filtration
(c) Churning
(d) Sedimentation

Question : 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 ___________.

(a) Decantation
(b) Filtration
(c) Sedimentation followed by decantation
(d) Evaporation

Question. 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?

(a) Add sugar before cooling.
(b) Add sugar after cooling
(c) There will be no difficulty in dissolving sugar in either cold water or in hot water.
(d) On adding ice the taste of the lemonade will change.

Question : The rate of sedimentation is increased by adding ____________ to the water.

(a) Salt
(b) Sugar
(c) Alum
(d) Soap

Question : The process of separating the constituents of a liquid by agitating it vigorously

(a) Evaporation
(b) Churning
(c) Filtration
(d) Sedimentation

Question : The method that is used to obtain pure salt from impure salt

(a) Decantation
(b) Crystallization
(c) Evaporation
(d) Condensation

Question : 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

Question : This harmful microbe in water causes typhoid and jaundice

(a) Virus
(b) Bacteria
(c) Algae
(d) Fungi

Question : Rain water is a kind of

(a) saline water
(b) distilled water
(c) carbonated water
(d) saturated water

Question : The method used to separate a dissolved solid component from its solution

(a) Evaporation
(b) Filtration
(c) sedimentation
(d) Decantation

Question : Butter is separated from curd by the process of

(a) Filtration
(b) Heating
(c) Churning
(d) Sieving

Question : A pure solid is obtained from its solution by the process of

(a) Condensation
(b) decantation
(c) Sedimentation
(d) Filtration

Question : Separating the insoluble suspended solids of various sizes from a liquid is called

(a) Filtration
(b) Crystallization
(c) Evaporation
(d) Condensation

Question : Cotton fibre is separated from cotton seeds by the process of

(a) Churning
(b) Boiling
(c) Colouring
(d) Ginning

Question : Principle behind winnowing is

(a) Difference in densities of components
(b) Difference in colours of components
(c) Difference in appearance of components
(d) Difference in shapes of components

Question : Paneer is separated from curdled milk

(a) Condensation
(b) Filtration
(c) evaporation
(d) sedimentation

Question : The process due to which steam changes into liquid state on cooling

(a) Decantation
(b) Sedimentation
(c) Filtration
(d) Evaporation

Question : Corn is separated from husk by the process of

(a) Sieving
(b) Winnowing
(c) Churning
(d) Handpicking

Question : A mixture of sugar and water can be separated by

(a) Filtration
(b) Evaporation
(c) Separating funnel
(d) decantation

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

(a) Evaporation
(b) Decantation
(c) Filtration
(d) Distillation

Question : The separation technique used to separate a solid‐solid mixture is ____.

(a) Decantation
(b) Evaporation
(c) Filtration
(d) Handpicking

Question : 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

(a) Sieving
(b) Evaporation
(c) Decantation
(d) Filtration

Question : Peanuts are separated from a mixture of peanuts and corn by ____.

(a) Sieving
(b) Winnowing
(c) Handpicking
(d) Threshing

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

(a) Threshing
(b) Winnowing
(c) Hand‐ picking
(d) Magnetic separation

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

(a) Filtration
(b) Evaporation
(c) Sedimentation
(d) Condensation

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

(a) Filtration followed by evaporation
(b) Sedimentation followed by evaporation
(c) Filtration followed by condensation
(d) None of the above.

Question : A saturated solution can dissolve more of a substance on

(a) Cooling
(b) Heating
(c) Condensing
(d) Evaporating

Question : To evaporate a liquid into its vapour, heat the liquid below its

(a) Above its melting point
(b) Below its boiling point
(c) Below its melting point
(d) Above its boiling point