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Class 6 - Science

Separation of Substances

Q&A
Question:

What is winnowing? Where is it used?

Answer:

Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. This process is used by farmers to separate lighter husk particles from heavier seeds of grain.

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Questions and Answers


Separation of Substances - Questions
1.

What is evaporation?


Answer
2.

What is decantation?


Answer
3.

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


Answer
4.

How can you separate grains from stalk?


Answer
5.

What is Sieving? Where can it be used?


Answer
6.

Define the term handpicking.


Answer
7.

What is winnowing? Where is it used?


Answer
8.

Write various methods of separation of components from their mixture.


Answer
9.

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


Answer
10.

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


Answer
11.

What is mixture?


Answer
12.

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


Answer
13.

Describe the method to obtain salt from sea water.


Answer
14.

What is strainer?


Answer
15.

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


Answer
16.

What do you mean by sieving? Give an example.


Answer
17.

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


Answer
18.

How can you separate grains from stalk?


Answer
19.

What is evaporation?


Answer
20.

What is strainer?


Answer
21.

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


Answer
22.

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


Answer
23.

Define condensation.


Answer
24.

Where is decantation used? Give two examples.


Answer
25.

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


Answer
26.

What is mixture?


Answer
27.

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
28.

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


Answer
29.

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


Answer
30.

Name the method used to separate cream from curd.


Answer
31.

Match the column:

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


Answer
32.

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


Answer
33.

What types of material can we separate by using handpicking?


Answer
34.

Write opposite process of evaporation.


Answer
35.

Name the method used to separate cream from curd.


Answer
36.

How will you separate oil and water from their mixture?


Answer
37.

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
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.

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
40.

Define winnowing.


Answer
41.

Write three methods of separation.


Answer
42.

How will you separate oil and water from their mixture?


Answer
43.

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


Answer
44.

What is threshing?


Answer
45.

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


Answer
46.

How will you separate sand and water from their mixture?


Answer
47.

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
48.

How will you prepare cheese (paneer)?


Answer
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