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Ncert exemplar Solutions Class 6 Science Separation of Substances
Welcome to NCTB Solutions. Here with this post we are going to help 6th class students for the Solutions of NCERT Exemplar Class 6 Science Book, Chapter 5, Separation of Substances. Here students can easily find step by step solutions of all the problems for Separation of Substances, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Separation of Substances all Questions Solution :
Multiple Choice Questions
Question no – (1)
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?
Answer :
The correct answer is option – (d)
Hand picking will be most appropriate for her to separate them.
Question no – (2)
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?
Answer :
The correct answer is option – (c)
Churning will be most appropriate for Boojho to prepare it.
Question no – (3)
Which of the following mixtures would you be able to separate using the method of filtration?
Answer :
The correct answer is option – (b)
Using the method of filtration we will separate the Cornflakes in milk
Question no – (4)
Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?
Answer :
The correct answer is option – (d)
Threshing will be most appropriate to separate grains from bundles of stalks.
Question no – (5)
Which of these can be separated by the method of winnowing?
Answer :
The correct answer is option – (d) (iii) and (iv)
Rice flakes and corn and Potato wafers and biscuits can be separated by the method of winnowing.
Question no – (6)
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?
Answer :
The correct answer is option – (b)
Sieving is the most suitable method to separate the grains from the flour.
Question no – (7)
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?
Answer :
The correct answer is option – (b) (ii) and (iii)
Combination of Decantation and Filtration is the correct.
Question no – (8)
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?
Answer :
The correct answer is option – (b)
Evaporation should be use to get back solid copper sulphate from the solution.
Question no – (9)
During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle still had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to
Answer :
The correct answer is option – (c)
These droplets of water were formed due to evaporation and condensation.
Question no – (10)
Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed? Which of the following should be Boojho’s answer?
Answer :
The correct answer is option – (d)
The Bhojo’s answer should be Condensation of atmospheric water vapour.
Very Short Type Questions :
Question no – (11)
Answer :
Ravi would win the game because he took hot boiling water and we know the more hot the solvent is the more solute it can dissolve in less time.
Question no – (12)
Answer :
(i) Small pieces of stone can be removed from rice by “Sieving”.
(ii) “Grains” are obtained from stalks by threshing.
(iii) Husk from wheat flour is generally removed by “Winnowing”.
(iv) The process of settling of heavier particles is called “Sedimentation”.
(v) Filtration is helpful in separating an insoluble “Substance” from a “Mixture”.
Question no – (13)
Answer :
(a) A mixture of oil and water can be separated by filtration
This statement is False.
Because, A mixture of water and paper can be separated by filtration.
(b) Water can be separated from salt by evaporation
This statement is True.
(c) A mixture of wheat grains and wheat flour can be separated by sieving
This statement is True.
(d) A mixture of iron filings and rice flour can be separated by magnet
This statement is True.
(e) A mixture of wheat grains and rice flakes can be separated by winnowing –
This statement is True.
(f) A mixture of tea leaves and milk can be separated by decantation
This statement is False.
Short Answer Questions
Question no – (14)
Answer :
To separate grains from husk the method of winnowing can be used in this process the mixture is poured from a height in presence of wind which carries away the husks from the grains.
It’s works on the principle that light objects tend to be carried away by wind while heavy objects simply fall down.
Question no – (15)
Answer :
(a) – (iii) Decantation
(b) – (iv) Magnet
(c) – (v) Evaporation
(d) – (ii) Hand picking
(e) – (i) Sieving
Long Answer Questions
Question no – (16)
Answer :
(a) How would they make salt solutions?
They both have to add the salt in the glass of water and stir it well in order to make a saturated solution.
(b) Who would be able to prepare saturated solution?
Both of them would be able to make salt water solution but in Mohan’s case it would be a saturated solution because some of the solution remains undissolved in water.
Question no – (17)
Answer :
She should start with filtering the muddy water with the muslin cloth and collect it in the tub. After that she could tie the alum with a thread and leave it for a while so the impurities will settle down. Now she can pour the water in a pan, cover it with a lid and then boil the water using a gas stove. After letting it cool the water is safe to drink.
Question no – (18)
Answer :
Happy, sun, threshed, winnowed, sieved, sieved.
The farmer and his wife got a good price for the flour because it was the finest and purest flour made after separating all the impurities from the grains.
Question no – (19)
Answer :
The oil being lighter than water will float on water so it should be easily separated by careful decantation of the oil layer. Sand could also be separated from the mixture by using a filter paper. Then the salt can be separated from water by simply evaporating the water in a beaker.
Question no – (20)
Answer :
The iron nails from the mixture can either be handpicked or separated using magnet bars. Oil is then separated from the mixture by decanting the layer of oil that forms above water surface. Lastly, salt is separated from the solution by simply evaporating the water.
Next Chapters Solution :
👉 Food : Where Does It Come From?
👉 Sorting Materials and Groups
👉 The Living Organisms and their Surroundings
👉 Motion and Measurement of Distances
👉 Light
👉 Water
👉 Garbage in, Garbage out
