Separation of Substances: Class 6 Science Q&A · Page 2
37 free answers on Separation of Substances (Science) for Class 6 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 6CBSE
In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half filled with water. Which method would you use to get back solid copper sulphate from the solution? (a) Decantation (b) Evaporation (c) Sedimentation Condensation
Solution: : Evaporation To get back solid copper sulphate from the solution we can use the method evaporation. When the solution of copper sulphate is evaporated, water evaporates, leaving behind the solid copper sulphate.
- ScienceClass 6CBSE
You might have observed the preparation of ghee from butter and cream at home. Which method(s) can be used to separate ghee from the residue? (i) Evaporation (ii) Decantation (iii) Filtration (iv) Churning Which of the following combination is the correct answer? (a) (i) and (ii) (b) (ii) and (iii) (c) (ii) and (iv) (iv) only
Solution: (b): Decantation and filtration To separate ghee (which is in liquid form) from the residue (which is in solid form) we can use the method decantation and filtration.
- ScienceClass 6CBSE
While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour? (a) Threshing (b) Sieving (c) Winnowing Filtration
Solution: (b): Sieving By the method of sieving, flour can be separated from wheat grains due to difference in size of flour and grain. Wheat grain will not pass through the sieve.
- ScienceClass 6CBSE
Four mixtures are given below. (i) Kidney beans and chick peas (ii) Pulses and rice (iii) Rice flakes and corn (iv) Potato wafers and biscuits Which of these can be separated by the method of winnowing? (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iii) (iii) and (iv)
(d): Rice flakes and corn; Potato wafers and biscuits By using the method of winnowing, mixtures of rice flakes and corn, potato wafers and biscuits can be separated since the weight of the two components is different, one being lighter and other being heavier.
- ScienceClass 6CBSE
Which amongst the following methods would be most appropriate to separate grains from bundles of stalks? (a) Hand picking (b) Winnowing (c) Sieving Threshing
: Threshing To separate grains from bundles of stalks threshing is the best method.
- ScienceClass 6CBSE
Which of the following mixtures would you be able to separate using the method of filtration? (a) Oil in water (b) Cornflakes in milk (c) Salt in water Sugar in milk
Solution: (b): Cornflakes in milk Since cornflakes are insoluble in milk it can be separated by the method of filtration.
- ScienceClass 6CBSE
Boojho’s grandmother is suffering from diabetes. Her doctor advised her to take ‘Lassi’ with less fat content. Which of the following methods would be most appropriate for Boojho to prepare it? (a) Filtration (b) Decantation (c) Churning Winnowing
Solution: (c): Churning Butter (fat) is separated by churning the curd and the remaining lassi contains less fat content.
- ScienceClass 6CBSE
Paheli bought some vegetables such as French beans, lady’s finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them? (a) Winnowing (b) Sieving (c) Threshing Hand picking
Solution: (d): Hand picking Since the vegetables are big in size hand picking is the best method for separating the vegetables.
- ScienceClass 6CBSE
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?
Solution: Ice should be added to lemonade after dissolving sugar. It is possible to add more sugar before adding ice.
- ScienceClass 6CBSE
True or false. (a) A mixture of milk and water can be separated by filtration. (b) A mixture of powdered salt and sugar can be separated by the process of winnowing (c) Separation of sugar from tea can be done with filtration. (d) Grain and husk can be separated with the process of decantation.
Solution: a) False b) False c) False d) False
- ScienceClass 6CBSE
Fill in the blanks. (a) The method of separating the seeds of paddy from its stalks is called ___________. (b) 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 ___________. (c) Salt is obtained from seawater by the process of ___________. (d) 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 ___________.
Solution: (a) The method of separating the seeds of paddy from its stalks is called threshing. (b) 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 filtration. (c) Salt is obtained from seawater by the process of evaporation. (d
- ScienceClass 6CBSE
How would you obtain clear water from a sample of muddy water?
Solution: The following process should be carried out to obtain clear water from muddy water: i) Allow muddy water to stand. ii) Mud gets settled down in the water. ii) Slowly pour water into another container.
- ScienceClass 6CBSE
Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Solution: Yes, it is possible to separate sugar mixed with wheat flour by the following method: a) Mix sugar and wheat flour in water. b) Stir the solution to allow the sugar to dissolve. c) Now, filter the mixture. d) Filtrate contains the sugar solution, and the residue will be wheat flour.
- ScienceClass 6CBSE
How will you separate sand and water from their mixture?
Solution: Sand and water are separated from their mixture by the following steps: a) The mixture is allowed to stand without any disturbances. b) Now, sand settles down. c) Slowly pour the water into another container to obtain sand in the bottom.
- ScienceClass 6CBSE
What is sieving? Where is it used?
Solution: Sieving is a method in which fine particles are sieved through holes in the sieve while the bigger impurities remain on the sieve. Sieving is used in a flour mill to separate impurities like husk and stones from wheat before grinding it. It is also used at construction sites to separate pebbles and stones from sand.
- ScienceClass 6CBSE
How will you separate husk or dirt particles from a given sample of pulses before cooking?
Solution: Husk and dirt particles are separated from pulses by winnowing.
- ScienceClass 6CBSE
Why do we need to separate different components of a mixture? Give two
Solution: When two or more substances are mixed together, they form a mixture. Components of a mixture should be separated because some components may not be useful or may spoil the useful component of the mixture. Examples: Tea leaves are separated from the liquid with a strainer while preparing tea. Removal of stone pieces from wheat, rice or pulses by h