CBSE Class 6 Science Exemplar Chapter 5: Separation of Substances NCERT Solutions

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NCERT Solutions PDF Class 6 PDF

This chapter, "Separation of Substances," for CBSE Class 6 Science Exemplar, delves into various methods used to separate different components from a mixture. The NCERT Solutions provide clear explanations and step-by-step guidance for techniques such as hand picking, churning, filtration, threshing, winnowing, and sieving. These solutions are designed to help students understand the practical applications of these separation methods in everyday life, from sorting vegetables to preparing food items. By working through these problems, students will develop a strong foundation in understanding the principles of separation, which is crucial for their science curriculum and exam preparation.

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BoardCBSE
ClassClass 6
SubjectScience Exemplar
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 5

Chapter summary

Chapter 5 of the CBSE Class 6 Science Exemplar focuses on the fundamental concept of separating mixtures. The NCERT Solutions cover multiple-choice questions and practical scenarios illustrating methods like hand picking for mixed vegetables, churning for separating fat from milk, filtration for insoluble solids like cornflakes in milk, threshing for separating grains from stalks, winnowing for separating lighter chaff from heavier grains, and sieving for separating flour from wheat grains. These solutions aim to build a clear understanding of when and how to apply each separation technique.

Learning outcomes

  • Understand the need for separating mixtures.
  • Identify appropriate separation methods for different mixtures.
  • Explain the process of hand picking and its applications.
  • Describe the method of churning for separating cream/butter from milk.
  • Differentiate between filtration and other separation techniques.
  • Explain the purpose and method of threshing grains.
  • Understand the principle behind winnowing for separating lighter from heavier components.
  • Apply the concept of sieving to separate solids of different sizes.

Topics covered

Paper topics

  • Separation of Substances
  • Hand Picking
  • Churning
  • Filtration
  • Decantation
  • Threshing
  • Winnowing
  • Sieving
  • Mixtures
  • Solids
  • Liquids
  • Grains

Important topics

  • Methods of Separation
  • Hand Picking
  • Filtration
  • Winnowing
  • Sieving
  • Churning
  • Threshing
  • Identifying Appropriate Methods

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Questions and Solutions

Multiple Choice Questions: 1

Paheli bought some vegetables such as French beans, lady's finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them?
  1. Winnowing
  2. Sieving
  3. Threshing
  4. Hand picking
Solution: (d): Hand picking

Since the vegetables are of different sizes and shapes, the most appropriate and practical method for Paheli to separate them is hand picking. This method involves manually picking out each type of vegetable from the mixture.

Multiple Choice Questions: 2

Boojho's grandmother is suffering from diabetes. Her doctor advised her to take 'Lassi' with less fat content. Which of the following methods would be most appropriate for Boojho to prepare it?
  1. Filtration
  2. Decantation
  3. Churning
  4. Winnowing
Solution: (c): Churning

To prepare lassi with less fat content, Boojho should use the method of churning. Churning the curd or cream causes the fat globules to clump together, forming butter, which can then be removed. The remaining liquid (lassi) will have a significantly reduced fat content, making it suitable for his grandmother.

Multiple Choice Questions: 3

Which of the following mixtures would you be able to separate using the method of filtration?
  1. Oil in water
  2. Cornflakes in milk
  3. Salt in water
  4. Sugar in milk
Solution: (b): Cornflakes in milk

Filtration is a method used to separate insoluble solid particles from a liquid or gas using a filter medium. In this case, cornflakes are solid and do not dissolve in milk, making them separable by filtration. Oil in water can be separated by decantation, while salt and sugar dissolve in water and cannot be separated by filtration.

Multiple Choice Questions: 4

Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?
  1. Hand picking
  2. Winnowing
  3. Sieving
  4. Threshing
Solution: (d): Threshing

Threshing is the agricultural process used to separate edible grains from the stalks and straw of the plant. This is typically done by beating the plant material to loosen the grains.

Multiple Choice Questions: 5

Four mixtures are given below.
  1. Kidney beans and chick peas
  2. Pulses and rice
  3. Rice flakes and corn
  4. Potato wafers and biscuits
Which of these can be separated by the method of winnowing?
  1. (i) and (ii)
  2. (ii) and (iii)
  3. (i) and (iii)
  4. (iii) and (iv)
Solution: (d): (iii) Rice flakes and corn; (iv) Potato wafers and biscuits

Winnowing is a method used to separate lighter components from heavier components by blowing air. This method is effective when there is a significant difference in the weight and size of the components. Rice flakes and corn, as well as potato wafers and biscuits, can be separated using winnowing because the lighter components (like rice flakes or potato wafers) can be blown away, leaving the heavier components (like corn or biscuits) behind.

Multiple Choice Questions: 6

While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?
  1. Threshing
  2. Sieving
  3. Winnowing
  4. Filtration
Solution: (b): Sieving

Sieving is the most suitable method to separate wheat grains from flour. A sieve has small holes that allow the finer flour particles to pass through, while the larger wheat grains are retained on the sieve. This method works because of the difference in the size of the particles.

Multiple Choice Questions: 7

You might have observed the preparation of ghee from butter and cream at home. Which method(s) can be used to separate ghee from the residue?
  1. Evaporation
  2. Decantation
Solution: (b): Decantation

When ghee is prepared from butter or cream, it is heated. The pure ghee, being a liquid, can be separated from the solid residue (like milk solids) by decantation. Decantation involves carefully pouring off the liquid (ghee) from the solid residue after it has settled.

Common mistakes

  • Confusing the applicability of different separation methods (e.g., using sieving when winnowing is more appropriate).
  • Not understanding the physical properties (size, weight, solubility) that enable separation.
  • Incorrectly identifying the insoluble component in a mixture for filtration.
  • Applying methods like threshing or winnowing to mixtures where they are not suitable.

Revision tips

  • Review the specific conditions under which each separation method is most effective.
  • Visualize the process for each method (hand picking, churning, filtration, etc.) to remember the steps.
  • Practice identifying the correct method for various real-life examples of mixtures.
  • Pay close attention to the differences in particle size, weight, and solubility that justify each method.

Practice MCQs

Q1. Which separation method is most suitable for separating French beans, lady's fingers, green chillies, brinjals, and potatoes mixed in a bag?

Q2. To prepare 'Lassi' with less fat content for a diabetic patient, which method should be used?

Q3. Which of the following mixtures can be separated using filtration?

Q4. What is the most appropriate method to separate grains from bundles of stalks?

Q5. Winnowing is an effective method for separating mixtures where components differ in:

Q6. Which method is most suitable for separating flour from wheat grains?

Frequently asked questions

What is the main topic of CBSE Class 6 Science Exemplar Chapter 5?

Chapter 5 of CBSE Class 6 Science Exemplar focuses on various methods used to separate different components from a mixture, such as hand picking, churning, filtration, threshing, winnowing, and sieving.

Which separation method is best for separating vegetables like French beans and potatoes?

Hand picking is the most appropriate method for separating vegetables of different sizes and shapes mixed together.

How can fat be reduced in 'Lassi' using a separation method?

Churning is used to separate butter (fat) from curd, which results in lassi with less fat content.

When is filtration used as a separation method?

Filtration is used to separate insoluble solid particles from a liquid. For example, separating cornflakes from milk.

What is the difference between winnowing and sieving?

Winnowing separates components based on weight (lighter chaff from heavier grains) using wind, while sieving separates components based on size (e.g., flour from wheat grains) using a sieve.

How do these NCERT Solutions help in exam preparation?

These solutions provide clear, step-by-step explanations and cover various separation techniques, helping students understand the concepts and practice applying them to different scenarios, which is essential for exam success.

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