Chapter 9. Methods of Separation in Everyday Life Class 6 Science Curiosity Solutions English Medium-Extra Questions Examination Based

NCERT Solutions Class 6 Science Curiosity English Medium

Chapter 9. Methods of Separation in Everyday Life

Topic: Extra Questions Examination Based

Chapter 9. Methods of Separation in Everyday Life

The following important questions are prepared according to the latest CBSE pattern and NCERT Curiosity textbook. These questions include competency-based, conceptual, and examination-oriented questions for better practice.

Important Questions with Answers

Practice these questions regularly to strengthen your understanding of different methods of separation used in everyday life.

1 Mark Questions

Answer each question in one sentence.

Question 1. What is a mixture?

Answer: A mixture is a physical combination of two or more substances.

Question 2. Which method is used to remove stones from rice?

Answer: Handpicking.

Question 3. Which method is used to separate husk from grains?

Answer: Winnowing.

Question 4. What is the purpose of sieving?

Answer: It separates particles of different sizes.

Question 5. Which method is used to separate butter from curd?

Answer: Churning.

Question 6. What is filtration?

Answer: Filtration is the process of separating insoluble solids from liquids using a filter.

Question 7. Which method is used to obtain salt from seawater?

Answer: Evaporation.

Question 8. Which instrument is used in magnetic separation?

Answer: A magnet.

Question 9. What is sedimentation?

Answer: It is the process in which heavier insoluble particles settle at the bottom of a liquid.

Question 10. Name one natural filter present in our body.

Answer: Nasal hair.

2 Marks Questions

Answer each question in about 30–40 words.

Question 1. Why is separation of substances necessary?

Answer: Separation helps remove unwanted impurities, obtain useful substances, improve quality, and make materials safe for use.

Question 2. Differentiate between handpicking and sieving.

Answer:

Handpicking	Sieving
Done manually.	Uses a sieve.
Suitable for large visible impurities.	Suitable for particles of different sizes.

Question 3. What is the difference between sedimentation and decantation?

Answer: Sedimentation allows heavy particles to settle at the bottom, while decantation is the careful pouring of the clear liquid from above the settled particles.

Question 4. Why is filtration better than decantation in some cases?

Answer: Filtration removes even very fine insoluble particles, whereas decantation cannot remove small suspended impurities completely.

Question 5. Give any two examples of magnetic separation.

Answer:

• Separating iron filings from sand.
• Removing iron pieces from scrap materials.

3 Marks Questions

Answer each question in about 50–70 words.

Question 1. Explain the process of winnowing.

Answer: Winnowing is used to separate lighter husk from heavier grains. The mixture is dropped from a height, and moving air blows away the lighter husk while the heavier grains fall straight down due to gravity.

Question 2. Explain the process of filtration with a suitable example.

Answer: In filtration, the mixture is passed through a filter paper or cloth. The liquid passes through as the filtrate, while insoluble solid particles remain on the filter as residue. Separating chalk powder from water is a common example.

Question 3. Describe the process of obtaining salt from seawater.

Answer: Seawater is collected in shallow ponds. Heat from the Sun causes water to evaporate slowly. After all the water evaporates, solid salt remains behind and is collected.

Question 4. Explain the working of magnetic separation.

Answer: A magnet attracts magnetic substances such as iron while non-magnetic substances remain behind. This method is useful for separating iron filings from mixtures.

Question 5. Describe the process of churning.

Answer: Churning is used to separate butter from curd. Continuous stirring causes fat particles to come together and float on the surface, where they can be collected easily.

Long Answer Questions

Answer the following questions in detail.

Question 1. Explain different methods of separation used in everyday life.

Answer:

Different methods of separation are used depending on the properties of the substances. Handpicking removes visible impurities, threshing separates grains from stalks, winnowing separates lighter husk from grains, sieving separates particles of different sizes, sedimentation and decantation separate heavier insoluble particles from liquids, filtration removes fine insoluble particles, evaporation recovers dissolved solids, churning separates butter from curd, and magnetic separation removes magnetic substances from mixtures.

Question 2. How do physical properties help in choosing the correct method of separation?

Answer:

The method of separation depends on differences in size, weight, shape, solubility, magnetic property, and density of the substances. For example, sieving depends on particle size, winnowing depends on weight, filtration depends on insolubility, and magnetic separation depends on magnetic properties.

Question 3. Explain sedimentation, decantation, and filtration with suitable examples.

Answer:

In sedimentation, heavy insoluble particles settle at the bottom of a liquid. During decantation, the clear liquid is carefully poured into another container. Filtration removes remaining insoluble particles using filter paper or cloth. For example, muddy water can first be allowed to settle, then decanted, and finally filtered to obtain cleaner water.

Question 4. Discuss the importance of separation methods in our daily life.

Answer:

Methods of separation help us obtain clean food, safe drinking water, pure substances, and useful materials. They are widely used in homes, agriculture, laboratories, industries, recycling plants, and water treatment systems. These methods improve health, reduce waste, and make many daily activities easier.

Question 5. Explain why no single method of separation can be used for every mixture.

Answer:

Different mixtures have different physical properties. Some mixtures differ in particle size, some in weight, some in solubility, while others differ in magnetic properties. Therefore, the method of separation must be selected according to the characteristics of the substances present in the mixture.

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