science - separation of substances

Class 6 - Science

Separation of Substances

Q&A
Question:

What is evaporation?

Answer:

The process of conversion of water into vapour is called evaporation.



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Questions and Answers


Separation of Substances - Questions
1.

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


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2.

What is mixture?


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3.

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


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4.

What is evaporation?


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5.

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


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6.

What is mixture?


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7.

What is evaporation?


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8.

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


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9.

What is strainer?


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10.

How can you separate grains from stalk?


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11.

Write opposite process of evaporation.


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12.

Define condensation.


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13.

Write various methods of separation of components from their mixture.


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14.

Write three methods of separation.


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15.

How can you separate grains from stalk?


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16.

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


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17.

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.


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18.

Define the term handpicking.


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19.

Match the column:

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


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20.

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


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21.

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


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22.

What do you mean by sieving? Give an example.


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23.

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


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24.

How will you separate sand and water from their mixture?


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25.

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


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26.

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


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27.

What is decantation?


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28.

Describe the method to obtain salt from sea water.


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29.

What is strainer?


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30.

Name the method used to separate cream from curd.


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31.

Name the method used to separate cream from curd.


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32.

What types of material can we separate by using handpicking?


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33.

Where is decantation used? Give two examples.


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34.

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


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35.

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


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36.

What is Sieving? Where can it be used?


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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.

How will you separate oil and water from their mixture?


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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 ?


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40.

What is winnowing? Where is it used?


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41.

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


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42.

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 ____________.


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43.

Define winnowing.


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44.

How will you separate oil and water from their mixture?


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45.

What is threshing?


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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


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47.

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


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48.

How will you prepare cheese (paneer)?


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