Science

Separation of Substances

Question:

How can you separate grains from stalk?

Answer:

We separate grains from stalk by threshing.

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Separation of Substances

Q 1.

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

Q 2.

What types of material can we separate by using handpicking?

Q 3.

How can you separate grains from stalk?

Q 4.

What is evaporation?

Q 5.

How can you separate grains from stalk?

Q 6.

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

Q 7.

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

Q 8.

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

Q 9.

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

Q 10.

Write opposite process of evaporation.

Q 11.

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

Q 12.

Write three methods of separation.

Q 13.

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

Q 14.

What is decantation?

Q 15.

What is strainer?

Q 16.

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

Q 17.

What is mixture?

Q 18.

What is strainer?

Q 19.

Where is decantation used? Give two examples.

Q 20.

Define condensation.

Q 21.

Write various methods of separation of components from their mixture.

Q 22.

What is mixture?

Q 23.

Match the column:

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

Q 24.

How will you separate oil and water from their mixture?

Q 25.

How will you separate sand and water from their mixture?

Q 26.

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

Q 27.

What is evaporation?

Q 28.

What is winnowing? Where is it used?

Q 29.

Describe the method to obtain salt from sea water.

Q 30.

What do you mean by sieving? Give an example.

Q 31.

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.

Q 32.

Define winnowing.

Q 33.

How will you separate oil and water from their mixture?

Q 34.

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

Q 35.

Define the term handpicking.

Q 36.

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

Q 37.

Name the method used to separate cream from curd.

Q 38.

Name the method used to separate cream from curd.

Q 39.

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

Q 40.

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

Q 41.

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 ?

Q 42.

What is Sieving? Where can it be used?

Q 43.

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.

Q 44.

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

Q 45.

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 ____________.

Q 46.

What is threshing?

Q 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

Q 48.

How will you prepare cheese (paneer)?