Chapter 9: Methods of Separation in Everyday Life Worksheet
Chapter 9
Methods of Separation in Everyday Life
Worksheet
A. Multiple Choice Questions
1. Which method is used to separate unwanted stones from rice?
(a) Filtration
(b) Handpicking ✅
(c) Evaporation
(d) Churning
Answer: (b) Handpicking
2. Threshing is mainly used to separate:
(a) Salt from water
(b) Cream from milk
(c) Grains from stalks ✅
(d) Oil from water
Answer: (c) Grains from stalks
3. Which method uses wind to separate lighter components from heavier components?
(a) Winnowing ✅
(b) Sieving
(c) Filtration
(d) Decantation
Answer: (a) Winnowing
4. Sieving is based mainly on the difference in:
(a) Colour
(b) Size of particles ✅
(c) Taste
(d) Smell
Answer: (b) Size of particles
5. Salt can be obtained from seawater by:
(a) Handpicking
(b) Filtration
(c) Evaporation ✅
(d) Magnetic separation
Answer: (c) Evaporation
6. The process in which heavier insoluble particles settle at the bottom is called:
(a) Sedimentation ✅
(b) Churning
(c) Winnowing
(d) Sieving
Answer: (a) Sedimentation
7. Carefully pouring the clear liquid after sedimentation is called:
(a) Filtration
(b) Decantation ✅
(c) Threshing
(d) Evaporation
Answer: (b) Decantation
8. Which method is commonly used to separate tea leaves from tea?
(a) Magnetic separation
(b) Filtration ✅
(c) Winnowing
(d) Handpicking
Answer: (b) Filtration
9. The solid material left on the filter is called:
(a) Filtrate
(b) Residue ✅
(c) Solution
(d) Vapour
Answer: (b) Residue
10. The liquid that passes through a filter is called:
(a) Residue
(b) Sediment
(c) Filtrate ✅
(d) Mixture
Answer: (c) Filtrate
11. Which substance can be attracted by a magnet?
(a) Sawdust
(b) Iron powder ✅
(c) Sand
(d) Wood
Answer: (b) Iron powder
12. Churning can be used to separate:
(a) Butter from curd ✅
(b) Salt from water
(c) Sand from water
(d) Iron from sawdust
Answer: (a) Butter from curd
13. Which method is suitable for separating oil and water?
(a) Decantation ✅
(b) Sieving
(c) Threshing
(d) Handpicking
Answer: (a) Decantation
14. Which of the following is used as a filtering material?
(a) Filter paper ✅
(b) Iron rod
(c) Magnet
(d) Wooden stick
Answer: (a) Filter paper
15. Separation of components of a mixture is useful because it helps us to:
(a) Remove unwanted substances
(b) Obtain useful substances
(c) Both (a) and (b) ✅
(d) Increase the size of particles
Answer: (c) Both (a) and (b)
B. Fill in the Blanks
1. The method of separating larger unwanted materials by picking them out with hands is called handpicking.
2. Threshing is used to separate grains from stalks.
3. Winnowing separates lighter and heavier components using moving air.
4. Sieving separates substances mainly on the basis of the size of their particles.
5. Salt can be obtained from seawater by evaporation.
6. The settling down of heavier insoluble particles is called sedimentation.
7. The process of carefully pouring the upper clear liquid is called decantation.
8. In filtration, the solid left behind on the filter is called residue.
9. The liquid passing through the filter is called filtrate.
10. Iron can be separated from a mixture using magnetic separation.
C. True or False
1. Handpicking is useful when the unwanted material can be easily seen and picked out.
Answer: True ✅
2. Threshing is used to separate grains from stalks.
Answer: True ✅
3. Winnowing separates substances on the basis of their colour.
Answer: False ❌
Correct statement: Winnowing separates lighter and heavier components using moving air.
4. Sieving can separate particles of different sizes.
Answer: True ✅
5. Salt can be obtained from salt solution by evaporation.
Answer: True ✅
6. Sedimentation involves the settling of heavier insoluble particles.
Answer: True ✅
7. Decantation involves carefully pouring off the upper liquid.
Answer: True ✅
8. Filtration can be used to separate tea leaves from tea.
Answer: True ✅
9. Iron is attracted by a magnet.
Answer: True ✅
10. Churning is used to separate butter from curd.
Answer: True ✅
D. Match the Following
| Column A | Answer | Column B |
|---|---|---|
| 1. Handpicking | (c) | Stones from rice |
| 2. Winnowing | (d) | Lighter and heavier particles |
| 3. Evaporation | (a) | Salt from seawater |
| 4. Churning | (b) | Butter from curd |
| 5. Magnetic separation | (e) | Iron from sawdust |
Answers:
1 – (c), 2 – (d), 3 – (a), 4 – (b), 5 – (e)
E. Very Short Answer Questions
1. What is a mixture?
Answer: A mixture is made up of two or more substances present together.
2. Why do we separate substances from a mixture?
Answer: We separate substances to remove unwanted materials or to obtain useful components.
3. What is handpicking?
Answer: Handpicking is a method in which unwanted substances are separated by picking them out with hands.
4. What is threshing?
Answer: Threshing is the process of separating grains from stalks.
5. What is winnowing?
Answer: Winnowing is a method of separating lighter and heavier components using moving air.
6. What is sieving?
Answer: Sieving is a method of separating particles of different sizes using a sieve.
7. Define evaporation.
Answer: Evaporation is the process in which a liquid changes into vapour.
8. What is sedimentation?
Answer: Sedimentation is the settling of heavier insoluble particles at the bottom of a liquid.
9. What is decantation?
Answer: Decantation is the process of carefully pouring off the upper clear liquid after sedimentation.
10. What is filtration?
Answer: Filtration is a method of separating an insoluble solid from a liquid using a filter.
F. Short Answer Questions
1. Explain handpicking with one example.
Answer: Handpicking is used when unwanted materials are large enough to be seen and picked out easily. For example, stones can be separated from rice by handpicking.
2. How is threshing different from winnowing?
Answer:
- Threshing separates grains from stalks.
- Winnowing separates lighter and heavier components using moving air.
3. Explain the process of winnowing.
Answer: In winnowing, a mixture of lighter and heavier materials is exposed to moving air. The lighter material is carried away by the air, while the heavier material falls down.
4. How does sieving help in separation?
Answer: Sieving separates particles of different sizes. Smaller particles pass through the holes of the sieve, while larger particles remain on the sieve.
5. How can salt be obtained from seawater?
Answer: Seawater is kept in shallow containers and exposed to sunlight. Water evaporates, leaving salt behind.
6. Explain sedimentation and decantation with an example.
Answer: When muddy water is left undisturbed, heavier mud particles settle at the bottom. This is sedimentation. The clear water above can then be carefully poured into another container. This is decantation.
7. What is filtration? Give two examples from everyday life.
Answer: Filtration separates an insoluble solid from a liquid using a filter. Examples include separating tea leaves from tea and filtering muddy water.
8. Differentiate between residue and filtrate.
Answer:
- Residue: The solid material left on the filter.
- Filtrate: The liquid that passes through the filter.
9. Explain how a magnet can be used for separation.
Answer: A magnet attracts magnetic materials such as iron. Therefore, iron can be separated from non-magnetic materials such as sawdust using a magnet.
10. Why are different methods of separation needed for different mixtures?
Answer: Different mixtures have different properties. Therefore, the method of separation depends on properties such as particle size, weight, solubility and magnetic nature.
G. Long Answer Questions
1. Explain the method of handpicking, threshing, winnowing and sieving. Give one example of each.
Answer:
Handpicking: Unwanted materials are picked out by hand.
Example: Stones from rice.
Threshing: Grains are separated from stalks by threshing.
Example: Separating wheat grains from stalks.
Winnowing: Lighter and heavier components are separated using moving air.
Example: Separating lighter husk from heavier grains.
Sieving: Particles of different sizes are separated using a sieve.
Example: Separating bran from flour.
2. Explain how salt can be separated from seawater by evaporation. Why is evaporation useful for this purpose?
Answer:
Seawater contains dissolved salt. When seawater is kept in shallow containers and exposed to sunlight, the water slowly changes into vapour and escapes into the air. The salt does not evaporate and remains behind. Thus, salt can be obtained from seawater by evaporation.
3. Explain sedimentation, decantation and filtration. Give suitable examples of each.
Answer:
Sedimentation: Heavier insoluble particles settle at the bottom when a mixture is left undisturbed.
Example: Mud settling in muddy water.
Decantation: After sedimentation, the clear upper liquid is carefully poured into another container.
Example: Separating clear water from settled mud.
Filtration: An insoluble solid is separated from a liquid using a filter.
Example: Separating tea leaves from tea.
4. Describe the process of filtration. Explain the terms filtering material, residue and filtrate.
Answer:
In filtration, a mixture containing an insoluble solid and a liquid is passed through a filtering material such as filter paper. The liquid passes through the filter, while the solid particles are retained.
- Filtering material: The material used to filter a mixture.
- Residue: The solid left on the filter.
- Filtrate: The liquid that passes through the filter.
For example, tea leaves can be separated from tea by filtration. Chapter 9 Method of Separation …
5. Explain magnetic separation with an example. How is magnetic separation useful in recycling?
Answer:
Magnetic separation uses a magnet to separate magnetic substances from non-magnetic substances. For example, iron pieces can be separated from sawdust using a magnet.
In recycling, magnets can help separate iron and other magnetic metals from mixtures of waste materials. Chapter 9 Method of Separation …
6. A mixture contains potatoes, salt and sawdust. Explain how you would separate all three components using suitable separation methods.
Answer:
- Handpicking: Pick out the potatoes from the mixture.
- Add water: Salt dissolves in water, while sawdust does not dissolve and can remain separate/float.
- Decantation or removal of floating sawdust: Separate the sawdust from the salt solution.
- Evaporation: Evaporate the water from the salt solution to obtain salt.
Thus, handpicking, decantation and evaporation can be applied in sequence.
7. Explain why separation of substances is important in our everyday life. Describe at least five separation methods and mention one use of each.
Answer:
Separation is important because we often need to remove unwanted materials or obtain useful substances from mixtures.
| Separation Method | Use |
|---|---|
| Handpicking | Removing stones from rice |
| Threshing | Separating grains from stalks |
| Winnowing | Separating lighter husk from grains |
| Sieving | Separating particles of different sizes |
| Evaporation | Obtaining salt from seawater |
| Sedimentation | Settling mud from muddy water |
| Decantation | Pouring clear water away from settled solids |
| Filtration | Separating tea leaves from tea |
| Churning | Separating butter from curd |
| Magnetic separation | Separating iron from non-magnetic materials |
These methods are used in homes, agriculture, food preparation, water purification and recycling.
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