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Class 6 - Science

Separation of Substances

Q&A
Question:

Explain the method that can be used for separating the following mixture:
(i) Sand and husk
(ii) Wheat, sugar and stalk
(iii) Water and petrol
(iv) Rice and salt
(v) Sand and salt

Answer:

(i) Mixture of sand and husk: Sand and husk can be separated by the method of winnowing.
(ii) Mixture of wheat, sugar and stalk: For separating stalk from the mixture we should follow the winnowing method because milk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are in different sizes.
(iii) Mixture of water and petrol: Water does not dissolve in petrol. So, it can be separated by the use of separating funnel.
(iv) Mixture of rice and salt: Rice and salt can be separated by sieving.
(v) Mixture of sand and salt: Sand and salt is mixed with water, salt dissolves in water and sand can be separated solution by sedimentation and decantation followed by filtration. After that using evaporation common salt is separated.



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Questions and Answers


Separation of Substances - Questions
1.

What is strainer?


Answer
2.

What is evaporation?


Answer
3.

Why do we need to separate different components of a mixture? Give two examples.


Answer
4.

Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?


Answer
5.

Name the method used to separate the pieces of stone from grain.


Answer
6.

What is decantation?


Answer
7.

What is strainer?


Answer
8.

Can the above stated method be used if both the components have same weight?


Answer
9.

What is mixture?


Answer
10.

Write various methods of separation of components from their mixture.


Answer
11.

Define the term handpicking.


Answer
12.

What is evaporation?


Answer
13.

What is Sieving? Where can it be used?


Answer
14.

Name the method used to separate cream from curd.


Answer
15.

Name the other methods used to separate solid materials of different size.


Answer
16.

Where is decantation used? Give two examples.


Answer
17.

What is winnowing? Where is it used?


Answer
18.

How will you separate mango from a mixture of mango and apple?


Answer
19.

Name the method used to separate the pieces of stone from grain.


Answer
20.

How can you separate grains from stalk?


Answer
21.

How can you separate grains from stalk?


Answer
22.

Name the process used to separate heavier and lighter components of a mixture.


Answer
23.

What do you mean by threshing? Where is it used?


Answer
24.

Describe the method to obtain salt from sea water.


Answer
25.

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.


Answer
26.

Name the method by which we get salt from ocean water.


Answer
27.

Define condensation.


Answer
28.

How will you separate mango from a mixture of mango and apple?


Answer
29.

What do you mean by sieving? Give an example.


Answer
30.

Match the column:

ncert-solutions-for-class-6th-science-chapter-5-separation-of-substances-s10


Answer
31.

What is mixture?


Answer
32.

You are given a mixture of salt and sand. Can you separate them by picking?


Answer
33.

Name the method used to separate cream from curd.


Answer
34.

What types of material can we separate by using handpicking?


Answer
35.

Write opposite process of evaporation.


Answer
36.

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 ?


Answer
37.

How will you separate oil and water from their mixture?


Answer
38.

Fill in the blanks:
(a) The method of separating 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 ______.  
(a) Salt is obtained from sea water by the process of ____________ .
(b) 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 ____________.


Answer
39.

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.


Answer
40.

How will you separate oil and water from their mixture?


Answer
41.

Define winnowing.


Answer
42.

How would you obtain clear water from a sample of muddy water?


Answer
43.

Write three methods of separation.


Answer
44.

How will you separate husk or dirt particles from a given sample of pulses before cooking?


Answer
45.

What is threshing?


Answer
46.

Explain the method that can be used for separating the following mixture:
(i) Sand and husk
(ii) Wheat, sugar and stalk
(iii) Water and petrol
(iv) Rice and salt
(v) Sand and salt


Answer
47.

How will you separate sand and water from their mixture?


Answer
48.

How will you prepare cheese (paneer)?


Answer
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