RBSE Class 6 Science Chapter 9 Solutions in English — Methods of Separation in Everyday Life

RBSE Class 6 Science Chapter 9 Question Answer Methods of Separation in Everyday Life

By tackling theseRBSE Class 6 Science Solutionsand RBSE Class 6 Science Chapter 9 Methods of Separation in Everyday Life Question Answer in English Medium, students will build a solid foundation in the topic.

Methods of Separation in Everyday Life Class 6 Questions and Answers

RBSE Class 6 Science Chapter 9 Methods of Separation in Everyday Life Question Answer

Methods of Separation in Everyday Life Class 6 Question Answer – InText

Page 165

Question 1.
A small amount of puffed rice is mixed with chana dal. Can you think of separating this mixture by any method other than handpicking?
Answer:
Yes, we can separate this mixture by using winnowing method other than manual picking.

Page 168

Question 1.
Have you ever observed white patches on the dark coloured clothes you wear during hot summers? How are these patches formed?
Answer:
Yes, during summers the water present in our sweat evaporates and the sweat turns white. The salts present in the water remain on the clothes in the form of stains.

RBSE Class 6th Science Chapter 9 Question Answer – Exercise

Let us enhance our learning

Question 1.
What purpose does handpicking serve in the process of separation?
(i) Filtration
(ii) Sorting
(iii) Evaporation
(iv) Decantation
Answer:
(ii) Sorting

Question 2.
Which of the following substances are commonly separated using the churning method?
(i) Oil from water
(ii) Sand from water
(iii) Cream from milk
(iv) Oxygen from air
Answer:
(iii) Cream from milk

Question 3.
Which factor is usually essential for the filtration?
(i) Apparatus size
(ii) Presence of air
(iii) Pore size
(iv) Temperature of the mixture
Answer:
(iii) Pore size

Question 4.
State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s).
(i) Salt can be separated from salt solution by keeping it under the Sun.
(ii) Handpicking should be used only when the quantity of one component is less.
(iii) A mixture of puffed rice and rice grains can be separated by threshing.
(iv) A mixture of mustard oil and lemon water can be separated by decantation.
(v) Sieving is used to separate a mixture of rice flour and water.
Answer:
(i) True-Reason— It is easy to pick small quantity by hand.

(ii) True-Reason— Water will evaporate and remaining salt will remain.

(iii) False— Because winnowing method is used to separate heavy and light components of a mixture. Correct statement – Mixture of puffed rice and rice grains can be separated by winnowing.

(iv) True-Reason— Oil and water will form separate layers which can be separated by decantation.

(v) False-Reason— Sieving method is used to separate solid mixture of particles of different sizes. Correct Statement – Filtration method is used to separate rice flour and water.

Question 5.
Match the mixtures in Column I with their method of separation in Column II.

Answer:

Question 6.
In what situations would you use decantation instead of filtration to separate solids from liquids?
Answer:
When in a mixture of solid and liquid, the solid component is heavier and the size of its particles is more, then it will be appropriate to use decantation method instead of filtration to separate the mixture.

Question 7.
Can you relate the presence of nasal hair to any separation process?
Answer:
The hair present in the nose separates the fine particles present in the air entering the nose from the air. Thus, the hair present in the nose separate the fine particles present in the air entering the nose. They act like a filter. So the filtration process of separation takes place in the nose.

Question 8.
During the COYTD-19 pandemic, all of us wore masks. Generally, what material are they made of ? What is the role of these masks?
Answer:
The masks used during the time of COVID- 19 (Coronavirus pandemic) were generally made of cloth and paper. Masks cover the mouth and nose which filter the air taken for breathing, due to which pathogens are not able to enter and the person remains safe from infection.

Question 9.
A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.
Answer:
Each component of a mixture of potatoes, salt and saw dust can be separated in the follow ing way—

1. First of all, potatoes-will be separated from the mixture by handpicking method.
2. Then the remaining mixture of salt and sawdust will be dissolved in water and filtered, due to which the sawdust will be separated.
3. Finally, the remaining water will be evaporated, due to which salt will remain.

Question 10.
Read the following story titled ‘Intelligent Leela’ and tick the most appropriate options. Provide a suitable title of your choice for the paragraph.
Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container, she noticed that the water was muddy and fit/unfit for drinking. To purify the water, she kept it for some time and then she filtered/ churned the muddy water using a piece of paper/muslin cloth. Leela, then, cooled/boiled the water for about 10 minutes in a covered pan. After cooling/boiling, she filtered/churned it again and made it fit/unfit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.
Answer:
(i) Thirsty (ii) water (lii) unfit (iv) filtered (v) paper (vi) boiled (vii) cooling (viii) filtered (ix) fit Suitable title—‘Pure Water’

RBSE Class 6 Science Chapter 9 Important Questions

Multiple Choice Questions

1. The best method of separating stones and husk from wheat and rice is—
(a) Handpicking
(b) Threshing
(c) Sieving
(d) Filtration
Answer:
(a) Handpicking

2. The most important factor in winnowing method is—
(a) Farmer
(b) Water
(c) Air
(d) Impurities
Answer:
(c) Air

3. The process in which the heavier component settle down at the bottom when water is added to a mixture is called—
(a) Decantation
(b) Sedimentation
(c) Filtration
(d) Sieving
Answer:
(b) Sedimentation

4. Which method of separation is used for making panner at home?
(a) Evaporation
(b) Condensation
(c) Decantation
(d) Filtration
Answer:
(d) Filtration

5. Which method do farmers use to separate grains from the bundles of dry plants?
(a) Handpicking
(b) Threshing
(c) Sieving
(d) Evaporation
Answer:
(b) Threshing

6. The method of separation of substances is—
(a) Sedimentation
(b) Handpicking
(c) Evaporation
(d) All of the above
Answer:
(d) All of the above

7. Which method of separation is used in salt manufacturing?
(a) Evaporation
(b) Decantation
(c) Handpicking
(d) Threshing
Answer:
(a) Evaporation

8. Which method is used to separate bran from wheat flour-
(a) Sedimentation
(b) Condensation
(c) Sieving
(d) Evaporation
Answer:
(c) Sieving

9. Filtration method is suitable for which process—
(a) Removing leaves from tea
(b) Removing bran from wheat flour
(c) Obtaining salt from sea water
(d) All of the above
Answer:
(a) Removing leaves from tea

10. The best method of separating iron scraps from waste material is—
(a) Handpicking
(b) Threshing
(c) Winnowing
(d) Magnetic separation
Answer:
(d) Magnetic separation

Fill in the blanks

1. A filter paper is one such …………………….. that has very fine pores in it.
Answer:
filter

2. Evaporation can be used to separate a solid dissolved in a …………………….. .
Answer:
liquid

3. Churning is used to extract butter from …………………….. .
Answer:
curd

4. Ev aporation is the process in which a liquid gets converted into its …………………….. .
Answer:
vapour

5. …………………….. process is also used for washing and cleaning rice and pulses.
Answer:
Decantation

6. The choice of filter depends upon the …………………….. of the particles of the materials to be removed.
Answer:
size

True/False

1. Separation by handpicking is done based on the differences in size colour and shape of the particles. (True/False)
Answer:
True

2. When the particles of the components of a mixture of two or more solids have different sizes, the method of sieving is used. (True/False)
Answer:
True

3. In a mixture of solid and liquid, the heavier component settles down. This process is called filtration. (True/False)
Answer:
False

4. A mixture of milk and water can be separated by filtration. (True/False)
Answer:
False

Match the words given in Column-I with Column-II

Question 1.

Answer:

Question 2.

Answer:

Very Short Answer Type Questions

Question 1.
Name the main methods of separation.
Answer:
Handpicking, threshing, winnowing, sieving, sedimentation, decantation, filtration, evaporation, magnetic separation etc. are the main methods of separation.

Question 2.
What is threshing?
Answer:
The process in which the stalks are beaten to separate grains from them is called threshing.

Question 3.
Traditionally, which vessel is used to separate the heavier and lighter components of a mixture?
Answer:
Traditionally, a soop (bamboo tray) is used for separating heavier and lighter components of a mixture.

Question 4.
What is meant by winnowing?
Answer:
The method of separating heavier and lighter components of a mixture by wind or by blowing air is called wimiowing.

Question 5.
When is the sieving method used?
Answer:
When the sizes of the particles of the components of a mixture of two or more solids are different; than the method of sieving is used.

Question 6.
Name a source of common salt in Rajasthan?
Answer:
One of its sources in Rajasthan is Sambhar lake.

Question 7.
What is sedimentation?
Answer:
The process of settling down of heavier insoluble component at the bottom of a liquid is called sedimentation.

Question 8.
What is meant by sieving?
Answer:
The process of separating solids from a mixture on the basis of differences in the size of the particles using a sieve is called sieving.

Question 9.
What is a ‘filter paper’?
Answer:
A filter paper is a filter which has very fine pores.

Question 10.
What is magnetic separation?
Answer:
The separation of magnetic and non¬magnetic substances using a magnet is called magnetic separation.

Question 11.
When is filtration used?
Answer:
Filtration is used to separate insoluble solid components from a precipitate.

Question 12.
Which method can be used to separate a mixture of precipitates which do not mix with each other?
Answer:
Decantation method.

Question 13.
Which process of separation continues in the oceans?
Answer:
Evaporation.

Question 14.
By which methods of separation can insoluble impurities like soil be removed from water?
Answer:
By sedimentation, decantation and filtration method.

Question 15.
What is used to extract butter from curd?
Answer:
Churning is used to extract butter from curd.

Short Answer Type Questions

Question 1.
What do you understand by handpicking method of separation? When is this method convenient to use?
Answer:
The process of separating small pebbles and husks from a solid mixture by hand is called handpicking. This is done on the basis of difference in size, colour and shape of the particles. If the particles to be removed are present in small quantities and can easily be picked by hand, handpicking proves to be a convenient method.

Question 2.
Can both threshing and winnowing operations be done simultaneously? Explain.
Answer:
Yes, it is possible to do both threshing and winnowing operations simultaneously. Technological developments have resulted in developing of threshing machines called threshers. These machines are used for separating grains from the stalks and husk. They perform both the tasks of threshing and winnowing simultaneously.

Question 3.
Where and how is salt obtained? Explain.
Answer:
Salt is obtained from sea water. Sea water is a mixture of salts and some other substances dissolved in water. To obtain salt, the sea water is kept in shallow pits and exposed to sunlight and air. In a few days, the water evaporates completely, leaving behind the solid mixture.

Common salt is then obtained from this mixture by further purification.

Question 4.
What is the difference between sedimentation and decantation? Explain.
Answer:
The process of settling down of heavier insoluble component at the bottom of a liquid is called sedimentation. When the water (liquid) is removed by tilting the vessel, the process is called decantation.

Question 5.
Which method is better for separating tea leaves from prepared tea and why?
Answer:
Filtration method is better than decantation method for separating tea leaves from prepared tea because in decantation method some leaves remain in the tea which get completely separated in filtration method and remain in the sieve.

Question 6.
Which materials can be used as filters? On what does their selection depend?
Answer:
Apart from paper, many materials like cotton, charcoal, sand etc. can be used as filters. Selection of filter depends on the size of the particles of the materials to be separated.

Question 7.
Can a piece of cloth be used as a filter? Explain.
Answer:
A piece of cloth can be used as a filter because there are small pores or holes between the threads in the weave of a piece of cloth. These holes in the cloth can be used for filtering.

Long Answer Type Questions

Question 1.
How can oil and water be separated from their mixture?
Answer:
Oil and water can be separated from their mixture by the following process :
(i) First of all, take their mixture in a vessel and keep it for some time.

(ii) After some time, oil and water separate into two separate layers.
After this, the component which forms the upper layer is separated by decantation.

Question 2.
How can salt be separated from a mixture of water and salt? Explain.
Answer:
Salt can be separated from a mixture of water and salt by the process of evaporation—

1. First of all, heat the salt mixed water in a beaker.
2. By continuously heating the water, all the water turns into vapour.
3. Due to this, the water evaporates but the salt remains in the beaker.In this way, salt can be separated from a mixture of water and salt by the process of evaporation.

Question 3.
What is decantation? Give one use of it in daily life.
Answer:
After the heavy insoluble component settles down at the bottom of a vessel, the liquid is removed by tilting the vessel. This process is called decantation.

Uses : Decantation is used in daily life for soaking and cleaning pulses and rice.

Question 4.
The use of ‘tea bag’ is based on which method of separation? – Which materials are used to make tea bags?
Answer:
The use of tea bags is based on the filtration method of separation. Tea bags were initially made of soft cloth, like silk, because it could hold the tea leaves and let water pass through. Silk was strong and did not fall apart when it touched hot water. Later, people started using gauze or muslin. Eventually they began using filter paper, which is what most tea bags are made of today.

Question 5.
The milk kept in a bowl in your house has curdled. How can you use it? Which method of separation will you use in this process?
Answer:
When milk curdles, it turns into a mixture of solid particles and liquid. The solid particles present in the liquid can be used to make cheese. To separate these solid particles from the cheese, we will use the filtration method of separation. For this, we separate the solid particles from the mixture by filtration using a cloth or sieve.

Essay Type Questions

Question 1.
Describe the different methods of separation used in daily life.
Answer:
Following methods of separation are used in daily life—
1. Handpicking— The process of handpicking is used to separate solids from a mixture on the basis of their size, colour and shape.

2. Threshing— The process in which the stalks are beaten to separate grains from them is called threshing.

3. Winnowing— The method of separating lighter husk from heavier grains by wind or blowing air is called winnowing.

4. Sieving— The process of separating solids from a mixture based on variations in particle size using a sieve is called sieving.

5. Evaporation— Evaporation is the process in which a liquid gets converted into its vapour. It can be used to separate a solid dissolved in a liquid.

6. Decantation— The process of settling down of heavier insoluble component at the bottom of a liquid is called sedimentation. When the liquid is removed by tilting the vessel, the process is called decantation.

7. Filtration— This method is used to separate insoluble solids from a solution.

8. Magnetic Separation— In this, magnetic and non-magnetic substances are separated using magnets.

Question 2.
Explain ‘magnetic influx’ and state the utility of this method.
Answer:
Substances which are attracted to magnets are called magnetic substances, e g. iron. The process of separating highly magnetic substances like iron from non-magnetic substances using magnets is called magnetic separation.

Use— Nowadays, recvclers use magnets to separate iron articles from a heap of waste. In many industries, the waste material often contains scrap iron. This is separated from the heap of waste materials using magnets fitted to a crane. The scrap iron can be recycled and reused.

RBSE Class 6 Science Chapter 9 Notes

Class 6 Science Chapter 9 Notes RBSE – Methods of Separation in Everyday Life Class 6 Notes

1. Before using a substance, we need to separate harmful and useless substances mixed in it and sometimes useful substances need to be separated to use them separately.
2. The method of picking by hand from a mixture (when two or more substances are mixed) such as small stones and husk from wheat and rice is called handpicking. It is done on the basis of differences in size, colour and shape of the particles.
3. The process in which grains are separated from stalks by beating them is called threshing.
4. Traditionally, winnowing is used to separate heavy and light components of a mixture.
5. The method of separating heavier and lighter components of a mixture by wind or by blowing air is called winnowing.
6. The process of separating solids from a mixture on the basis of difference in size of particles using a sieve is called filtration.
7. The process of converting a liquid into its vapour is called evaporation. It is generally used to separate solids dissolved in a solution.
8. The process of settling down of heavier insoluble component at the bottom of a liquid is called sedimentation. When the water (liquid) is removed by tilting the vessel, the process is called decantation.
9. Insoluble solid components can be separated from a liquid by filtration.
10. Filter paper is a filter which has very fine pores.
11. Churning is used to extract butter from curd.
12. Separation of magnetic and non-magnetic substances using a magnet is called magnetic separation.