CBSE Class 6 Science Important Questions Chapter 3 - Separation of Substances - Free PDF Download
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
Short Answer Questions 3 marks
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.
Long Answer Questions 5 marks
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.
A mixture of sand and water is taken in a glass/container and left for some time.
Sand settles at the bottom of the container during this process because it is heavier. This is called sedimentation.
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.
Important Related Links for CBSE 6 Science
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.
To know more students can download the vedantu app.
5. What is the basis of the separation of components of mixture Class 6?
The basis of chapter 3 is to make students understand why the separation of various substances is essential and of importance. Thereby, they are introduced to different methods of separation like winnowing, threshing, sieving, etc. All these concepts lead students back to the basic concept which is addressed in the chapter. Separating substances are useful in daily lives for a lot of purposes. The Important Questions created for this chapter are available free of cost in the form of PDF from the vedantu website (vedantu.com). It will help to strengthen the basic concept by focusing on necessary areas.
