Class 6 Science Lesson 4 Solution (English Medium) – Separation of Substances

SEBA Class 6 Science (English Medium) Lesson 4 – “Separation of Substances” Summary & Solutions

Looking for SEBA Class 6 Science (English Medium) Lesson 4 – “Separation of Substances” solutions? At Ospin Academy, we provide detailed NCERT-based textbook answers, multiple-choice questions (MCQs), and a complete chapter summary to help students in Assam prepare for their exams.

📖 Chapter Overview:

In Assam, people separate substances daily while preparing food, cleaning, and even farming. This chapter teaches students how to separate useful substances from mixtures using different scientific methods.

• Why Separation is Needed: Removing unwanted substances from mixtures
• Common Methods: Handpicking, sieving, winnowing, filtration, evaporation, and condensation
• Examples from Assam: – Separating rice husk from grains using winnowing – Filtration of river water for drinking – Separation of tea leaves using a strainer
• Use in Daily Life: Cooking, water purification, food production, and agriculture

📌 Key Topics Covered:

• ⭐ Why do we need to separate substances?
• ⭐ What are the different methods of separation?
• ⭐ How is filtration used to purify water in Assam?
• ⭐ What is the role of evaporation in salt-making?
• ⭐ How do farmers in Assam use winnowing to separate grains?

📝 Why Use Our Solutions?

• ✅ Exam-Oriented Solutions: Fully NCERT-aligned answers for Class 6 Science Lesson 4
• ✅ MCQs & Extra Questions: Prepare better with objective-type questions
• ✅ Concept Clarity: Well-explained answers with examples from Assam to help students relate to real-life applications
• ✅ Quick Revision Notes: Summarized notes for last-minute SEBA exam revision

Start learning SEBA Class 6 Science (English Medium) Lesson 4 – Separation of Substances with Ospin Academy’s step-by-step solutions, specially designed for students in Assam!

 

Exercise

1. Why do we need to separate different components of a mixture? Give two examples.

Ans: We need to separate different components of a mixture because there are some harmful or non- useful substances mixed with it.

For example:

(i) Separate stones from rice.

(ii) Separate tea leaves.

2. What is winnowing? Where is it used?

Ans: Method of separating components of a mixture is called winnowing.

 

Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. This method is used by farmers.

3. How will you separate husk or dirt particles from a given sample of pulses before cooking?

Ans: Husk or dirt particles can separate by winnowing, being lighter they will fly away from pulses.

4. What is sieving? Where is it used?

Ans: Sieving is a process by which fine particles are separated from biggar particles by using a sieve.

 

It is used at flour mills or at construction sites. In flour mills impurities like husk and stone are removed from wheat. Pebbles and stones are removed from sand by sieving.

5. How will you separate sand and water from their mixture?

Ans: We will separate sand and water by sedimentation and decantation method. First we leave this mixture for some time. After some time, the sand which is heavier is settled down at the bottom. After that we will pour water into another container and the mixture will be separated.

6. Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

Ans: Sugar can be separated from wheat flour by sieving. Due to the difference in the size of particles, sugar will stay on the sieve and wheat flour will pass through it.

7. How would you obtain clear water from a sample of muddy water?

Ans: We will obtain clear water from a sample of muddy water by the process of filtration.

8. Fill up the Blanks:

(a) The method of separating seeds of paddy from its stalks is called ________.

Ans: Threshing.

(b) When milk, cooled after boiling, is poured onto a pieces of cloth the cream (maim) is left behind on it. This process of separating cream from milk is an example of ________.

Ans: Filtration.

(c ) Salt is obtained from seawater by the process of ____________.

Ans: Evaporation.

(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separating used in this example is called ________.

Ans: Sedimentation and decantation.

9. True or false?

(a) A mixture of milk and water can be separated by filtration.

Ans: False.

(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.

Ans: False.

(c) Separation of sugar from tea can be done with filtration.

Ans: False.

(d) Grain and husk can be separated with the process of decantation.

Ans: False.

11. Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar. In which case would it be possible to dissolve more sugar?

Ans: Ice should be added to lemonade after dissolving sugar. It is possible to add more sugar before adding ice.

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