Methods of Separation in Everyday Life Class 6 Extra Questions and Answers Science Chapter 9

Class 6 Science Chapter 9 Extra Questions Methods of Separation in Everyday Life

Class 6 Science Chapter 9 Methods of Separation in Everyday Life Important Extra Questions and Answers

Methods of Separation in Everyday Life Class 6 Extra Questions Very Short Answer Type

Question 1.
Which method is used to separate grains from the stalks?
Answer:
Threshing

Question 2.
Which method is usually used to separate small pieces of stones from pulses at home?
Answer:
Handpicking

Question 3.
Name a method used to separate husk from the wheat.
Answer:
Winnowing

Question 4.
Which method is used to separate the components of a mixture which are of different sizes?
Answer:
Sieving

Question 5.
Name a device used to separate a mixture of sand and small iron nails
Answer:
Magnetic separation

Question 6.
Name the method used in cashewnuts factories to separate cashewnuts of different sizes.
Answer:
Sieving

Question 7.
Name the method used to separate cream from milk.
Answer:
Churning

Question 8.
Name the method by which we get salt from ocean water.
Answer:
Evaporation

Question 9.
What is strainer?
Answer:
Strainer is a kind of sieve which is used to separate a liquid from the solid.

Question 10.
Name the method for separating a mixture of chalk powder and water.
Answer:
Filtration

Methods of Separation in Everyday Life Class 6 Extra Questions Short Answer Type

Question 1.
What is winnowing? Where is it used?
Answer:
Winnowing is the method of separating husk from grains with the help of wind. The method of winnowing is used to separate husk from various types of grains.

Question 2.
What is sieving? Where can it be used?
Answer:
Sieving is a process by which fine particles are separated from bagair particles by using a sieve. It is used in the floor mills or at construction site.

Question 3.
What is a difference between sieving and winnowing?
Answer:
Sieving is used to separate the components of a mixture which are of different sizes. But winnowing is generally used by the farmers to separate husk from grain.

Question 4.
The mixture of a powdered white solid A and a liquid B can be separated by filtration. The solid A is left behind on the filter paper but clear liquid B passes through the filter paper and collects in the beaker kept below.
(a) Name one solid which could be like A.
(b) Name the liquid which B could be.
Answer:
(a) Chalk powder
(b) Water

Question 5.
What is evaporation? State one large scale use of the process of evaporation.
Answer:
Evaporation is a process in which liquid get converted into its vapours. The process of evaporation is used on a large scale to obtain common salt from a sea-water.

Question 6.
What do you mean by decantation? Give an example where it is used.
Answer:
Decantation is a process by which we can remove a liquid without disturbing the solid settled down in the bottom.
Before cooking rice, pulses etc are washed with water. The wash water is removed by decantation.

Question 7.
Define the term threshing. What is it principle?
Answer:
Threshing is the process in which stalks of wheat, paddy, etc are beaten to separate grains from the stalks and from the chaff that covers the grains. The method of separation is based on the fact that the stalks and the chaff are soft materials whereas the grains are very very hard.

Question 8.
Write the steps to separate a mixture of oil, water and fine sand particles.
Answer:

• First separate oil by the process of decantation.
• Fine oil particles can then be separated by the process of filtration.

Question 9.
How will you separate sand and water from their mixture?
Answer:
Take sand and water mixture in a beaker, left it undisturbed for sometime. Sand being heavier than water settles at the bottom of the beaker.

Question 10.
Write two uses of centrifugation.
Answer:

• It is used in dairies and home to separate butter from cream.
• It is used in washing machines to squeeze out water from the wet clothes.

Question 11.
Give one use of the handpicking method of separating mixtures in daily life.
Answer:
Handpicking is used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses.

Question 12.
How is handpicking done?
Answer:
Pulses, rice or wheat containing small pieces of stones are picked up from the grains by hand, one by one, and thrown away. Thus, all the stones are removed and only food grains are left behind.

Question 13.
Suggest separation technique(s) one would need to employ the following mixtures.
(a) Mercury and Water
(b) Common salt, water and sand.
Answer:
(a) Mercury and water are immiscible but mercury is much heavier than water and hence can be separated by decantation.
(b) Shake the mixture and filter, sand being insoluble remains on the filter paper while filtrate is the solution of common salt in water. The filtrate is evaporated, when pure common salt is left behind.

Question 14.
Three girls A, B and C prepared mixtures using chalk powder, common salt and milk respectively in water whose mixture
(a) Would not leave residue on filter paper after filtration?
(b) Would settle down at the bottom when left undisturbed.
(c) Could be filtered by filter paper?
Answer:
(a) Mixture of common salt and water.
(b) Mixture of chalk powder and water.
(c) Mixture of chalk powder and water.

Question 15.
State the separation technique you would apply for the separation of the following:
(a) Tea leaves from tea.
(b) Iron pins from sand.
(c) Fine mud particles suspended in water.
Answer:
(a) Filtration
(b) Magnetic separation
(c) Decantation and filtration.

Question 16.
Explain the method that can be used for separating the following mixture.
(i) Sand and husk.
(ii) Wheat, sugar and stalk
(iii) Rice and salt
Answer:
(i) Sand and husk can be separated by the method of winnowing.
(ii) For separating stalk from the mixture, we should follow the winnowing method because stalk is lighter than other two components and get separated. Wheat and sugar can be separated by sieving because they are in different sizes.
(iii) Rice and salt can be separated by sieving.

Question 17.
Explain the method that can be used for separating sugar mixed with wheat flour.
Answer:
Some water is added to the mixture of sugar and flour in a beaker and stirred. Sugar dissolves in water to form sugar solution whereas flour remains undissolved. It is then filtered. On filtering, wheat flour is obtained on the filter paper and sugar solution is obtained as filtrate. The sugar solution is evaporated slowly where pure sugar is left behind.

Question 6.
How is winnowing done?
Answer:
The mixture of wheat grains and husk is taken in a winnowing basket. The farmer stands at a higher platform from the ground and allows the mixture of wheat grains and husk to fall down from a height by shaking his winnowing basket continuously. Due to the difference in their densities, the grain which is heavier, falls down vertically and forms a heap, while the husk being lighter, forms a separate heap at a small distance away from the heap of wheat.

Question 7.
How would you obtain clear water from a sample of muddy water?
Answer:
We can obtain clear water from a sample of muddy water by the process of filtration. A filter paper folded in the form of a cone is fixed in a funnel. The mixture is then poured on the filter paper. Solid particles in the mixture do not pass through it and remain on the filter paper. Water which is now collected is clear.

Question 8.
Gun powder is a mixture of nitre, sulphur and carbon. Nitre is soluble in water, sulphur is soluble in carbon disulphide while carbon is soluble neither of the two. How will you separate the constituents.
Answer:
The given mixture is first stirred with water and then filtered. Nitre dissolves while sulphur and carbon remain on the filter paper. Evaporation of water from the filtrate give nitre.  The mixture consisting of sulphur and carbon is shaken with carbon disulphide and filtered. Sulphur dissolves while carbon remains on the filter paper. Evaporation of carbon sulphide from the filtrate gives sulphur.

Question 9.
How will you separate a mixture of iron filings, sand and common salt?
Answer:
Removal of iron filings: Spread the mixture on a sheet of paper. Roll in it a magnet. Remove the magnet from the mixture. Scrap off iron filings from it. Repeat the procedure until no iron filings are left in the mixture.

Removal of Sand: Dissolve the mixture in water. The Salt will dissolve but not the sand. Filter the mixture.The sand is left on the filter paper.

Obtaining Common Salt from the filtrate: Transfer the filtrate into a china dish and heat it. Water evaporates leaving behind dry common salt.

Question 10.
A mixture contains two components ‘P’ and ‘Q’. The component ‘P’ is a white solid which is soluble in water. It is obtained on a large scale from sea-water by the process ‘R’. The component ‘Q’ consists of tiny pieces called filings which can be removed from the mixture by a device ‘X ‘.
(a) What do you think is component P?
(b) Name the process ‘R’.
(c) Name the component ‘Q’. What could the device ‘X’ be?
Answer:
(a) Common salt
(b) Evaporation
(c) Iron filings, Magnet.

Methods of Separation in Everyday Life Class 6 Extra Questions Long Answer Type

Question 1.
How will you separate a mixture of iron filings, chalk powder and common salt?
Answer:
Bring a magnet near the mixture several times. All the iron filings will stick to the magnet and get separated. Now, we are left with a mixture of chalk and common salt. Some water is added to the mixture of common salt and chalk powder and stirred.

Common salt dissolves in water to form salt solution. Chalkpowder remains undissolved on filtering, chalk powder is obtained on the filter paper and salt solution is obtained as filtrate. The salt solution is evaporated when pure common salt is left behind.

Question 2.
How will you separate pieces of stone and husk from wheat/ rice/pulses?
Answer:
Spread the grain on a sheet of paper. Now remove with your hand, the pieces of stones, husks and other grains from it.
The method of handpicking can be used for separating because undesirable substances such as small pieces of stones etc. in the food grains are usually small.

Question 3.
Explain how the used leaves are separated from the prepared tea by the method of filtration.
Answer:
To separate used tea-leaves we pour the prepared tea over a tea-strainer. The tea-strainer has a wire mesh in it which acts as a filter. The liquid tea passes through the small holes of a tea strainer and collects in the cup below. The tea leaves being bigger in size do not pass through the tea-strainer. The tea-leaves remain behind on the tea strainer. Thus, the used tea-leaves are separated from prepared tea by the method of filtration.

Question 4.
During rainy season, the river water becomes muddy. It cannot be made fit for drinking puposes just by decantation or filtration.
(a) What makes water muddy?
(b) Why can’t muddy water be purified by either decantation or filtration?
(c) Give a method to make muddy water fit for drinking purposes. I
Answer:
(a) The presence of clay particles makes water muddy.
(b) Five particles of clay settle down very slowly. The finer particles can be made to settle faster by dissolving a small quantity of alum in muddy water. This method is called loading. This helps the clay particles in water to combine with each other. Thus, they become very heavy and settle down rapidly.
(c) The pure water can then be obtained by decantation or filtration.

Question 5.
(a) Compound X dissolves in component Y to form a liquid mixture. If tis mixture is subjected to a process Z , then only component A can be recovered.
(i) Name one component which could be like X.
(ii) Give an example of a component like Y.
(iii) Name the process Z.
(b) Name the method of separating a mixture containing a solid an a liquid.
(i) Give an example.
Answer:
(a) (i) Salt
(ii) Water
(iii) Evaporation
(b) (i) Filtration
(ii) Sand in water

Methods of Separation in Everyday Life Class 6 Picture Based Questions

I. Look at the figure and answer the following questions:

Question 1.
What does the given picture represent?
(a) Winnowing.
(b) Handpicking.
(c) Threshing.
(d) Sewing.
Answer:
(b) Handpicking.

Question 2.
Which method is usually used to separate small pieces of stones from pulses at home ?
(a) Handpicking.
(b) Evaporation.
(c) Filtration
(d) Winnowing.
Answer:
(a) Handpicking.

Question 3.
When handpicking is used ?
Answer:
Handpicking method is used when,

• the unwanted material is present in smaller quantity.
• size, shape or colour of the unwanted material is different from that of the useful one.

II. Look at the figure and answer the following questions:

Question 1.
What done the given figure represent?
(a) Filtration.
(b) Threshing.
(c) Handpicking.
(d) Sieving.
Answer:
(b) Threshing.

Question 2.
Threshing is used by farmers to separate.
(a) Gram.
(b) Wheat rice
(c) Mustard seeds
(d) All of these
Answer:
(d) All of these

Question 3.
What is threshing ?
Answer:
The process in which the stalks are beaten to separate grains from them is called threshing.

Question 4.
On what facts, threshing is based ?
Answer:
Threshing is based on the fact that the stalks of the crop plants and the chaff are soft materials whereas the grains themselves are very hard.

Methods of Separation in Everyday Life Class 6 Case Based Questions

This method of separating heavier and lighter components of a mixture by wind or by blowing air is called winnowing. Have you seen any similar kind of activity being done at your home?

Question 1.
Name the method used to separate husk from wheat.
(a) Winnowing.
(b) Sieving.
(c) Threshing.
(d) Handpicking.
Answer:
(a) Winnowing.

Question 2.
Winnowing is used by farmers to separate.
(a) Lighter husk particles from heavier seeds of grain.
(b) heavier husk from seed.
(c) Both (a) and (b).
(d) None of these.
Answer:
(a) Lighter husk particles from heavier seeds of grain.

Question 3.
What is winnowing ?
Answer:
The method of separating lighter husk from heavier grains by wind or blowing air is called winnowing.

Question 4.
How will you separate husk or dirt particles from a given sample of pulses before cooking?
Answer:
Husk or dirt particles can be separated. by winnowing. Husk or dirt particles being lighter, they will fly away from pulses.

Question 5.
Which property of the constituents of a mixture is used in winnowing ?
Answer:
Winnowing is based on the property that grains are heavier than husk and hay.
Sieving is used to separate solid substances that differ in size. For example, rice flour is sieved to separate any large particles including weevils from it. Sieves are mostly made from a wire mesh or a metal plate with holes on it. The size of the mesh or the holes depends on the size of the substance.

Question 1.
Which method is used to separate the components of a mixture which are of different sizes ?
(a) Threshing.
(b) Sieving.
(c) Handpicking.
(d) Filtration.
Answer:
(b) Sieving.

Question 2.
Name the method used in cashewnut factories to separate cashewnuts of different sizes.
Answer:
Sieving.

Question 3.
What is sieving ?
Answer:
The process of separating solids from a mixture based on variations in particle size using a sieve is called sieving.

Question 4.
How do jewellers separate the pearls of different sizes ?
Answer:
Jewellers separate the pearls of different sizes by the method of sieving.

Question 5.
How is sieving done ?
Answer:
In sieving, a sieve having holes of proper size is used. The bigger particles are retained by the sieve, whereas the smaller ones pass through it.

Class 6 Science Extra Questions