Extra Questions for Chapter 9 Methods of Separation in Everyday Life Class 6 Science Curiosity
Class 6 Science Methods of Separation in Everyday Life Extra Questions
Multiple Choice Questions (MCQ)
Question 1. What is handpicking used for?
(a) Separating liquids from solids
(b) Separating small quantities of substances based on size and shape
(c) Separating grains from stalks
(d) Separating magnetic substances
Answer
(b) Separating small quantities of substances based on size and shape
Question 2. Which method uses wind to separate lighter particles?
(a) Sieving
(b) Threshing
(c) Winnowing
(d) Filtration
Answer
(c) Winnowing
Question 3. What is the purpose of evaporation in separation techniques?
(a) To separate insoluble solids from liquids
(b) To convert liquid into vapour and separate dissolved solids
(c) To remove larger particles from smaller ones
(d) To separate grains from husk
Answer
(b) To convert liquid into vapour and separate dissolved solids
Question 4. Which of the following is NOT a method of separation?
(a) Churning
(b) Sedimentation
(c) Compression
(d) Filtration
Answer
(c) Compression
Question 5. What does a thresher do?
(a) Separates liquids from solids
(b) Separates grains from stalks
(c) Separates husk from grains
(d) Separates small stones from wheat
Answer
(b) Separates grains from stalks
Fill in the Blanks
1. The process of separating grains from husk using wind is called _____.
2. _____ is used to separate lighter components from heavier ones by agitating a mixture.
3. In _____, heavier particles settle down at the bottom of a liquid.
4. _____ involves using a filter to remove insoluble solids from liquids.
5. To obtain salt from seawater, the process of _____ is used.
Answer
1. winnowing
2. Churning
3. sedimentation
4. Filtration
5. evaporation
True or False
1. Handpicking is a method used for separating large quantities of substances.
2. Sieving allows larger particles to pass through while trapping smaller particles.
3. Threshing is the process of separating grains from their stalks.
4. Magnetic separation can be used to separate non-magnetic substances from magnetic ones.
5. Winnowing is an effective method for separating heavier grains from lighter chaff.
Answer
1. False
2. False
3. True
4. False
5. True
Match the Following
Column A | Column B |
1. Sieving | A) Separates grains by beating |
2. Threshing | B) Uses a magnet for separation |
3. Winnowing | C) Separates based on particle size |
4. Magnetic Separation | D) Uses wind to separate husk from grains |
5. Churning | E) Separates butter from curd |
Answer
|
Column A |
Column B |
|
1. Sieving |
C) Separates based on particle size |
|
2. Threshing |
A) Separates grains by beating |
|
3. Winnowing |
D) Uses wind to separate husk from grains |
|
4. Magnetic Separation |
B) Uses a magnet for separation |
|
5. Churning |
E) Separates butter from curd |
Question 2.
Separation process | Purpose for which we do the separation | What do we do with the separated components? |
(1) Separate stones from rice | (a) To separate two different but useful components. | (i) We throw away the solid component. |
(2) Churning milk to obtain butter | (b) To remove non-useful components. | (ii) We throw away the impurities. |
(3) Separate tea leaves | (c) To remove impurities or harmful components. | (iii) We use both the components. |
Answer
Separation process | Purpose for which we do the separation | What do we do with the separated components? |
(1) Separate stones from rice | (c) To remove impurities or harmful components. | (ii) We throw away the impurities. |
(2) Churning milk to obtain butter | (a) To separate two different but useful components. | (iii) We use both the components. |
(3) Separate tea leaves | (b) To remove non-useful components. | (i) We throw away the solid component. |
One Word Answer
Question 1. Name the process to obtain salt from seawater.
Answer
Evaporation
Question 2. How will you separate mango from a mixture of mango and apple?
Answer
By handpicking
Question 3. Name the method used to separate the pieces of stone from grain.
Answer
Handpicking
Question 4. Name the method by which you can separate butter from milk.
Answer
Centrifugation
Question 5. Name the method used to separate a mixture of two insoluble liquids.
Answer
Sedimentation and decantation.
Question 6. Name the other methods used to separate solid materials of different size.
Answer
Sieving
Question 7. Name the process used to separate heavier and lighter components of a mixture.
Answer
Winnowing
Question 8. Name the method used to separate cream from milk.
Answer
Churning
Very Short Answer Questions
Question 1. What is the drawback of evaporation?
Answer
The liquid in the mixture is evaporated off into the air and is not recovered.
Question 2. What is the purpose of separating materials?
Answer
To organize and manage different materials effectively, improving efficiency and sustainability.
Question 3. What is handpicking?
Answer
A method of separating substances based on size, colour, or shape, often done manually.
Question 4. Which types of mixtures are separated by evaporation?
Answer
Evaporation is used to separate solids dissolved in liquid.
Question 5. Give an example of handpicking.
Answer
Separating black peppercorns from vegetable pulao by hand.
Question 6. What is threshing?
Answer
The process of separating grains from harvested stalks by beating them.
Question 7. What is the use of decantation?
Answer
Decantation is used to separate insoluble solids from liquids. Two immiscible liquids are also separated by this process.
Question 8. What is Sedimentation?
Answer
When the heavier component of a mixture settle down in the container is known as Sedimentation.
Question 9. How does winnowing work?
Answer
It uses wind to blow away lighter chaff while heavier grains fall to the ground.
Question 10. What is the function of threshing machines?
Answer
To separate grains from stalks and remove husk efficiently.
Question 11. What is sieving?
Answer
A method to separate particles based on size using a sieve.
Question 12. What happens if sieve holes are too large?
Answer
Both fine and larger particles will pass through, making it ineffective.
Question 13. How is salt obtained from seawater?
Answer
By evaporating seawater in shallow pits, leaving salt behind.
Question 14. What is sedimentation?
Answer
The process where heavier, insoluble particles settle at the bottom of a liquid.
Question 15. Define decantation.
Answer
Pouring off the liquid after sedimentation, leaving solids behind.
Question 16. What is filtration?
Answer
A method to separate insoluble solids from liquids using a filter medium.
Question 17. Give an example of filtration.
Answer
Filtering tea leaves from brewed tea using a strainer.
Question 18. Define the term handpicking.
Answer
The process used to separate slightly larger particles from a mixture by hand is called handpicking. For example: Stone pieces can be separated from wheat or rice by handpicking.
Question 19. What is churning?
Answer
Agitating a mixture to separate lighter components, like butter from curd.
Question 20. How does magnetic separation work?
Answer
It uses magnets to separate magnetic substances from non-magnetic ones.
Question 21. Provide an example of magnetic separation.
Answer
Separating iron nails from sawdust using a magnet.
Question 22. What materials can be used for filtration besides filter paper?
Answer
Cotton, charcoal, and sand can also be used as filters.
Question 23. Write three methods of separation.
Answer
Handpicking, threshing and winnowing.
Question 24. What is the primary focus of Ayurveda?
Answer
Holistic well-being using natural remedies from herbs and plants.
Question 25. Why are plant materials dried in Ayurveda?
Answer
To remove excess moisture while preserving their medicinal properties.
Question 26. What is the end product of evaporation of seawater?
Answer
A solid mixture of salts, primarily common salt.
Short Answer Questions
Question 1. What do you mean by sieving? Give an example.
Answer
Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger particles or impurities remain on the sieve. For example, in a flour mill, impurities like husk and stones are removed from wheat before grinding it.
Question 2. How will you prepare cheese (paneer)?
Answer
For making paneer, a few drops of lemon juice are added to milk as it boils. This gives a mixture of particles of solid paneer and liquid. The paneer is then separated by filtering the mixture through a fine cloth or strainer.
Question 3. Why is evaporation used in the salt-making process?
Answer
Evaporation is used in salt-making because it removes the water from seawater or salt solutions, leaving the salt crystals behind.
Question 4. Why is sieving not suitable for separating a mixture of liquids?
Answer
Sieving is used for separating solid mixtures based on particle size and is ineffective for separating liquids because liquids can pass through all sizes of sieve holes.
Question 5. What happens during the process of evaporation?
Answer
During evaporation, a liquid is converted into vapor, leaving behind any dissolved solid components, such as salt from seawater.
Question 6. How does decantation differ from filtration?
Answer
Decantation involves gently pouring off a liquid from a settled solid, while filtration involves passing a liquid through a filter to separate insoluble solids.
Question 7. In what situation would handpicking be the most effective method of separation?
Answer
Handpicking is most effective when the unwanted component, such as stones or debris, is larger and easily distinguishable from the rest of the mixture.
Question 8. What is the principle behind sedimentation and decantation?
Answer
Sedimentation allows heavier particles to settle at the bottom of a liquid, and decantation is the process of pouring off the clear liquid without disturbing the settled particles.
Question 9. How can you separate a mixture of sand and iron filings?
Answer
A mixture of sand and iron filings can be separated by using a magnet, which attracts the iron filings, leaving the sand behind.
Long Answer Questions
Question 1. 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 sieving.
(ii) Mixture of wheat, sugar and stalk: 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 of different sizes.
(iii) Mixture of water and petrol: Water does not dissolve in petrol. So, it can be separated by decantation.
(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 from the solution by sedimentation and decantation followed by filtration. After that by evaporation common salt can be separated.
Question 2. Describe the method to obtain salt from sea water.
Answer
Sea water contains many salts mixed in it. One of them is common salt, when sea water is allowed to stand in shallow pits, water gets evaporated by sunlight and slowly turns into water vapour. In a few days, the water evaporates completely leaving behind the solid salts. Common salt is then obtained from this mixture of salts by further purification.
Question 3. Name and describe briefly a method which can be helpful in separating a mixture of husk from grains. What is the principle of this method?
Answer
Winnowing: Winnowing can be used to separate lighter and heavier components of a mixture. Wheat grains and husk are different in weight, husk is lighter than wheat. When the mixture is allowed to fall down from a height, the wind carries the lighter husk with it and the heavy wheat grains fall vertically down on the ground.
Principle of this method is that the lighter particles are carried away by the wind.
Question 4. Mention the methods that can be used for the separation of the following mixtures:
(i) wheat, sugar and husk
(ii) rice, gram and iron fillings
(iii) sand, black gram (urad) and husk.
Answer
- Mixture of wheat, sugar and husk.
- For separating husk from the mixture, we should follow the winnowing method as husk is lighter than other two components.
- Wheat and sugar can be separated by sieving as they have different sizes.
- Mixture of rice, gram and iron fillings.
- For separating iron fillings, we can use a magnet.
- Rice and gram can be separated either by sieving or by handpicking.
- Mixture of sand, black gram (urad) and husk.
- For separating sand from the mixture, we can sieve the mixture.
- Black gram (urad)and husk can be separated by the method of winnowing.
Question 5. Write various methods of separation of compounds from their mixture.
Answer
- Handpicking
- Threshing
- Winnowing
- Sedimentation
- Decantation
- Evaporation
- Condensation.
Question 6. Where is decantation used? Give two examples.
Answer
(i) Decantation is used to separate insoluble solids or liquid from liquid. Rain water is a mixture of mud and water. It is purified by decantation.
(ii) Oil and water also get separated by this method because oil floats up.