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# Important Questions for CBSE Class 6 Science Chapter 3 - Separation of Substances

Last updated date: 18th Sep 2024
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## CBSE Class 6 Science Important Questions Chapter 3 - Separation of Substances - Free PDF Download

Free PDF download of Important Questions with solutions for CBSE Class 6 Science Chapter 3 - Separation of Substances prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Register Online for NCERT Class 6 Science tuition on Vedantu.com to score more marks in CBSE board examination. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions ,they can download Class 6 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Also, check CBSE Class 6 Science Important Questions for other chapters:

 CBSE Class 6 Science Important Questions Sl.No Chapter No Chapter Name 1 Chapter 1 Food: Where Does It Come From? 2 Chapter 2 Components of Food 3 Chapter 3 Fibre to Fabric 4 Chapter 4 Sorting Materials into Groups 5 Chapter 5 Separation of Substances 6 Chapter 6 Changes around Us 7 Chapter 7 Getting to Know Plants 8 Chapter 8 Body Movements 9 Chapter 9 The Living Organisms and Their Surroundings 10 Chapter 10 Motion and Measurement of Distances 11 Chapter 11 Light, Shadows and Reflections 12 Chapter 12 Electricity and Circuits 13 Chapter 13 Fun with Magnets 14 Chapter 14 Water 15 Chapter 15 Air Around Us 16 Chapter 16 Garbage In, Garbage Out

## Study Important Questions For Class 6 Science Chapter 3 – Separation of Substances

Very Short Answer Questions:                                                                             1 mark
1. Fill in the blanks:

(i) Name one method for separation of substances ________.

Ans: Winnowing

(ii) Separation of fine particles from bigger particles using a sieve ___________.

Ans: Sieving

(iii) Name on method used to separate sand and water _____________.

Ans: Sedimentation

(iv) Salt is obtained from seawater by a process known as __________.

Ans: Evaporation

(v) The process of separating cream from the milk is known as ___________.

Ans: Filtration

2. Define winnowing.

Ans: Winnowing is the process of separating heavy components from lighter components with the help of wind.

3. What is sieving?

Ans: Sieving is the process of separating tiny particles from larger particles by the use of holes in a sieve.

4. Define threshing.

Ans: The term "threshing" refers to the process of removing grains from their stalks. The stalks are beaten to liberate the grain seeds in this process.

5. Define sedimentation.

Ans: Sedimentation is the process in which heavier components settle down at the bottom of the container. E.g. Water mixed with mud or sand.

6. Define decantation.

Ans: Decantation is the process of taking out clear water into a new container after sedimentation. The water after decantation is clear but it is still not fit for drinking.

7. Define evaporation.

Ans: Evaporation is the process of converting water into water vapour.

8. Define condensation.

Ans: Condensation is the process of turning water vapour into liquid.
Example: Melting of ice.

9. Define saturated solution.

Ans: Saturated solution is a solution in which no more of a substance/solute can be dissolved.

10. Name 5 methods used for separating substances from their mixtures?

Ans: Five methods used for separating substances are:

• Winnowing

• Sieving

• Handpicking

• Threshing

• Decantation

11. Give one importance of separating substances from the mixtures.

Ans: It is important to separate substances from mixtures to obtain pure substances differently for various purposes.

12. How do you separate sugar mixed with wheat flour?

Ans: The method of sieving is used to separate the sugar and wheat flour mixture. First, the mixture is filtered through a sieve. Wheat flour particles will pass through, while the large sugar particles will be trapped by the sieve.

13. Explain the method used to separate the sand and water from their mixture?

Ans: A combination of sedimentation and decantation is used to separate sand and water.

1. A mixture of sand and water is taken in a glass/container and left for some time.

2. Sand settles at the bottom of the container during this process because it is heavier. This is called sedimentation.

3. The clean water is then gradually moved to another container slowly leaving the sand in the original container. This process is called decantation.

14. What is winnowing and why is it needed?

Ans: Winnowing is the process of separating heavy particles from lighter particles using wind. For example, winnowing can be used to separate husk particles from heavier grains such as wheat or patty. The husk particles will be carried away by the wind leaving large grains in a different pile. For winnowing, fast-moving air is the most important factor.

Advantage of Winnowing: The operation of this method does not involve the use of any machines. It is entirely reliant on human activity; hence it takes less time to process and is unquestionably inexpensive.

Disadvantage of Winnowing: Winnowing is a way of separating heavy components of a mixture from lighter components using wind, but this procedure does not work for items heavier than grains, such as stones.

## Benefits of Important Questions for CBSE Class 6 Science Chapter 3 - Separation of Substances

The benefits of having a set of important questions for CBSE Class 6 Science Chapter 3, "Separation of Substances," are manifold. These questions offer a structured approach to learning, helping students identify and focus on key concepts related to separation techniques. They stimulate critical thinking by presenting thought-provoking queries that encourage students to apply their knowledge practically. Moreover, important questions act as effective tools for exam preparation, guiding students towards the most relevant topics and providing a platform for self-assessment. They enhance problem-solving skills and deepen the understanding of scientific processes, fostering a lifelong appreciation for the subject. In essence, important questions enrich the learning experience, making science more accessible and fostering valuable skills for both academics and everyday life.

## Conclusion

The compilation of important questions for CBSE Class 6 Science Chapter 3, "Separation of Substances," is a valuable educational asset. These questions serve as essential aids for students, offering a structured approach to mastering the concepts related to separating substances. They encourage critical thinking and problem-solving skills by posing thought-provoking inquiries. Importantly, they serve as effective tools for exam preparation, enabling students to focus on the most significant topics and evaluate their own understanding. Beyond academics, these important questions foster an appreciation for scientific processes and their practical applications in daily life. In essence, they enrich the learning journey, making science more engaging and accessible while equipping students with valuable skills for both the classroom and the real world.

## FAQs on Important Questions for CBSE Class 6 Science Chapter 3 - Separation of Substances

1. Why is the separation of substances necessary? State 3 points.

Separating substances are really important in our day-to-day lives. Most of the time, a substance is always mixed and is in an impure state. The following points help state the necessity of separating different substances;

• Impure substances cannot be used for many purposes. Therefore, separating unwanted or useless components is important.

• Separating components help increase the quality, purity, strength, and utilities of various substances.

• Finally, estimation of ratios of different substances is also possible when substances are separated.

2. Does ink lose its properties when mixed with water?

Yes, ink loses its properties when mixed with water because its ratio gets changed, and hence, the property is lost. Once the ink is dropped in water, diffusion happens and it gets evenly spread throughout the water particles. This happens because of the random motion of both water and ink particles. The chapter can get quite confusing for class 6 students with topics like these especially. Important Questions for chapter 3 can guide students by providing an easy explanation.

3. How do you teach the separation of substances?

Chapter 3 is about ‘Separation of Substances’. It mainly deals with different types of separation methods, the necessity of separating various substances, properties of different mixtures, and other related topics. By using Important Questions for chapter 3, important areas in the chapter can be selected and taught to students by putting more emphasis. The ideas are conveyed in a simple and legible format, so students can easily grasp hold of the information to score a perfect result.

4. Why do we need to separate substances Class 6?

There is always a need to separate substances for various purposes. The majority of the time, a substance is always mixed and impure. The following points will help students understand why it is important to separate substances:

• Many things can't be done with impure substances. As a result, it's critical to remove undesirable elements from substances.

• The quality, strength, etc. of substances can be improved through separation.

• When substances are separated, estimation of ratios of distinct substances is achievable.