What type of mixture is formed when sugar is dissolved in water?

A homogeneous mixture (solution)

Why do heavier particles settle in sedimentation?

Due to gravity, denser particles are pulled to the bottom of the container

How does sieving work to separate mixtures?

It separates particles based on size – smaller particles pass through holes while larger ones remain

It uses magnets to attract particles

Why is filtration used after sedimentation in water purification?

To remove remaining fine particles that did not settle during sedimentation

To increase the speed of sedimentation

In salt production from sea water, why is evaporation the key method used?

Sea water is evaporated using sunlight, leaving behind salt crystals since salt does not evaporate with water

Salt is extracted by filtering sea water

Salt sinks to the bottom of the sea

Why is magnetic separation useful in industry?

It efficiently separates large quantities of iron or steel from other materials without needing chemicals

It is cheaper than all other methods

It can separate all types of metals

It is only used in science labs

What is chromatography used for?

Separating mixtures of coloured substances or chemicals based on their different rates of movement through a medium

Separating mixtures by magnetism

Why is threshing used in agriculture?

To separate grain from the stalks of harvested crops

How does distillation produce pure water from salt water?

Salt water is boiled, water evaporates leaving salt behind, steam is cooled and condenses back to pure liquid water

Why is it important to separate mixtures before use?

To obtain pure substances needed for specific purposes like medicine, food, and industrial processes

Because all mixtures are poisonous

How does centrifugation separate components of a mixture?

By spinning the mixture rapidly so denser components move to the outside/bottom while lighter components stay on top

A farmer has a mixture of wheat grains, chaff, and small stones. What sequence of methods should they use to get clean grain?

Winnowing (remove chaff) → Sieving (remove stones by size) → Handpicking (remove remaining stones)

Handpicking → Filtration → Evaporation

Sieving → Magnetic separation → Boiling

Decantation → Winnowing → Distillation

Why is water from a river not safe to drink directly, and what simple methods can purify it?

River water contains silt (sedimentation removes it), particles (filtration removes them), and microbes (boiling kills them)

River water only needs to be filtered once

Boiling alone is sufficient without sedimentation or filtration

How does the process of making tea demonstrate a method of separation?

Tea leaves are separated from the liquid tea by filtration (straining), which uses the difference in particle size

Tea leaves sink to the bottom (sedimentation)

Why would distillation be preferred over simple evaporation when separating sea water into pure water and salt?

Distillation recovers the water by condensing steam; evaporation wastes the water by releasing it as steam

Both methods produce the same results

How is chromatography used to identify if a sample of ink is pure or a mixture?

If the ink is a mixture, chromatography will separate it into different coloured bands on the paper, each representing a different component

Pure ink and mixed ink look the same in chromatography

Chromatography uses heat to separate ink

Chromatography can only separate colourless mixtures

A laboratory needs to separate a mixture of iron powder and sulphur powder. What method is most appropriate and why?

Magnetic separation – a magnet attracts iron but not sulphur, separating them without affecting sulphur's composition

Sieving, because they have different sizes

Filtration, because one dissolves in water

Why are different separation methods needed for different types of mixtures?

Because mixtures differ in their properties (solubility, particle size, magnetism, density) and no single method works for all

All mixtures can be separated by filtration

Mixtures can only be separated in laboratories

How does the separation of cream from milk demonstrate a real-world application of centrifugation?

Milk is spun rapidly; the denser milk settles to the outside and lighter fat (cream) rises to the centre and is removed

A magnet separates cream from milk

Which of the following are methods of separating mixtures based on differences in density?

Winnowing (different densities in air)

Which of the following separation methods use the property of solubility?

Evaporation (removing dissolved salt from water)

Filtration (separating insoluble particles)

Distillation (separating solvent from dissolved material)

Which of the following are examples of separation methods used in everyday life?

Using a strainer to separate tea leaves from tea (filtration)

Using a magnet to separate iron from sand

Using a sieve to separate flour from bran

Using winnowing to separate grain from chaff

Water purification plants use multiple steps to clean river water. Which sequence of steps and methods is most logical?

Sedimentation (settle large particles) → Filtration (remove fine particles) → Chlorination (kill microbes) → Supply to homes

Boiling → Magnetic separation → Distillation

Filtration → Sedimentation → Winnowing

Chromatography → Evaporation → Sieving

Why is it important that separation methods are non-destructive (should not chemically change the components)?

Because the goal is to recover the original pure components in their unchanged form for use or further study

Chemical changes make separation faster

Destroying components makes them purer

Non-destructive methods are only used in labs

In forensic science (crime investigation), how might chromatography be used?

To separate and identify ink from documents, dyes from clothing, or substances in a crime scene sample by their unique separation patterns

To identify criminals by blood type only

Chromatography is not used in forensic science

Hospitals use centrifuges to separate blood into its components. Why is this separation important?

Different components (plasma, red cells, white cells, platelets) are used for different medical treatments – transfusions, plasma therapy, platelet donations

Blood separation is done only for research

All blood components are used together

Centrifugation makes blood more nutritious

How does the concept of separation apply to environmental remediation (cleaning up oil spills)?

Oil floats on water (different density) and can be skimmed off (decantation-like), absorbed with materials, or removed using booms – separation by density and absorption

Oil is removed by boiling the ocean

Chemical reactions are the only way to remove oil

Oil spills cannot be separated from water

Which of the following are reasons why water from a well or river must be treated before drinking?

It contains suspended soil particles (removed by sedimentation and filtration)

It may contain harmful microorganisms (killed by boiling or chlorination)

It may contain dissolved chemicals or salts

It contains air that is harmful

Which of the following correctly describe properties that determine which separation method to use?

Magnetism → magnetic separation

Density difference → sedimentation or winnowing

Boiling point difference → distillation

Which of the following are industrial applications of separation methods?

Petroleum refining uses distillation to separate crude oil into petrol, diesel, and kerosene

Sugar refining uses filtration and crystallisation

Iron extraction uses magnetic separation

Air separation uses distillation to get nitrogen, oxygen, and argon

Which of the following statements correctly describe filtration?

It separates insoluble particles from a liquid

The filter allows liquid to pass but retains solid particles

It can remove dissolved substances like sugar from water

It is used in water purification

Which separation methods are used in producing food and beverages?

Filtration (removing fruit pulp from juice)

Evaporation (making concentrated juice)

Centrifugation (separating cream from milk)

NCERT Solutions Class 6 Science Chapter 9 – Methods of Separation in Everyday Life

Name: Methods of Separation in Everyday Life – Class 6 Science
Uploaded: 2026-07-24T01:52:13+00:00
Description: This chapter explores how different methods like handpicking, sieving, winnowing, filtration, sedimentation, decantation, evaporation, magnetic separation, and churning are used in everyday life to separate substances based on their physical properties.

Class 6 Science

Last Updated: 24 July 2026

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Chapter Introduction

This chapter explores how different methods like handpicking, sieving, winnowing, filtration, sedimentation, decantation, evaporation, magnetic separation, and churning are used in everyday life to separate substances based on their physical properties.

हिंदी में (Hindi)

यह अध्याय विभिन्न विधियों जैसे कि हाथ से चुनना, छानना, फटकना, निस्यंदन (फिल्ट्रेशन), अवसादन (सेडिमेंटेशन), शमन (डिकैंटेशन), वाष्पीकरण, चुंबकीय पृथक्करण और मंथन के माध्यम से पदार्थों को उनकी भौतिक विशेषताओं के आधार पर अलग करने के तरीकों को समझाता है। ये सभी विधियाँ हमारे दैनिक जीवन में उपयोग की जाती हैं।

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Important Points

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Practice MCQ Questions (40 questions)

Q1. What method is used to separate grain from straw by throwing it in air?

Q2. What method is used to remove tea leaves from tea?

Q3. What method uses a magnetic material to separate iron from a mixture?

Q4. What is sedimentation?

Q5. What is the process of carefully pouring liquid without disturbing the settled sediment called?

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Tough Words (Glossary)

Winnowing

Meaning: Separating lighter particles from heavier ones using wind or air

अर्थ: पवनायन

"Farmers use winnowing to separate husk from grains."

Threshing

Meaning: Beating harvested crops to separate grains from stalks

अर्थ: मड़ाई

"Threshing separates grains from the stalks."

Handpicking

Meaning: Separating small impurities by hand

अर्थ: हाथ से चुनना

"They removed stones from rice by handpicking."

Mixture

Meaning: A substance made by combining two or more materials

अर्थ: मिश्रण

"Sand and salt together form a mixture."

Component

Meaning: One of the parts of a mixture

अर्थ: घटक

"Salt is a component of seawater."

Convenient

Meaning: Easy and useful

अर्थ: सुविधाजनक

"Handpicking is convenient for small impurities."

Curiosity

Meaning: Strong desire to learn or know something

अर्थ: जिज्ञासा

"Their curiosity led them to ask questions."

Fascinated

Meaning: Strongly attracted or interested

अर्थ: मोहित

"Children were fascinated by the huge grain piles."

Stalk

Meaning: The stem part of a plant that holds grains

अर्थ: डंठल

"The wheat stalks were drying in the sun."

Husk

Meaning: The outer covering of grains

अर्थ: भूसी

"The husk was blown away during winnowing."

Sieve

Meaning: A tool with holes to separate particles by size

अर्थ: चलनी

"Flour is filtered using a sieve."

Sieving

Meaning: Separating particles using a sieve

अर्थ: चलनी से छानना

"Sieving removes bran from flour."

Bran

Meaning: The outer layer of wheat grain

अर्थ: चोकर

"Bran is left behind after sieving."

Exposed

Meaning: Left open to air or sunlight

अर्थ: प्रकट/खुला हुआ

"Salt is obtained by keeping seawater exposed."

Evaporation

Meaning: Process of liquid changing into vapour

अर्थ: वाष्पीकरण

"Water evaporates from shallow pits."

Purification

Meaning: Process of removing impurities

अर्थ: शुद्धिकरण

"Salt is obtained after purification."

Remedy

Meaning: A treatment for an illness

अर्थ: उपचार

"Herbs are used as remedies in Ayurveda."

Facilitate

Meaning: To make an action easier

अर्थ: सुगम बनाना

"Drying facilitates evaporation of water."

Strainer

Meaning: A tool used to filter liquids

अर्थ: छन्नी/छलनी

"We use a strainer to remove tea leaves."

Sedimentation

Meaning: Process where heavier particles settle at bottom

अर्थ: अवसादन

"Mud settles down by sedimentation."

Decantation

Meaning: Pouring liquid gently to leave solids behind

अर्थ: अवलेपन

"We used decantation to separate water from sand."

Filtration

Meaning: Separating solids from liquids using a filter

अर्थ: निस्यंदन

"Filtration is used to clean muddy water."

Impurity

Meaning: An unwanted substance mixed in another

अर्थ: अशुद्धि

"Impurities are removed from drinking water."

Pores

Meaning: Small holes in a material

अर्थ: छिद्र

"Cloth has pores for filtration."

Charcoal

Meaning: A black substance from burnt wood

अर्थ: कोयला

"Charcoal can be used as a filter."

Gauze

Meaning: Thin loosely woven cloth

अर्थ: गॉज़

"Gauze can act as a simple filter."

Muslin

Meaning: Lightweight cotton fabric

अर्थ: मलमल

"Muslin was used to make tea bags."

Filter paper

Meaning: Special paper with tiny pores for filtering

अर्थ: फ़िल्टर कागज

"We used filter paper in the lab."

Mesh

Meaning: Net-like structure with holes

अर्थ: जाली

"Fish are caught in a mesh net."

Churning

Meaning: Stirring curd to separate butter

अर्थ: मंथन

"Churning curd separates butter from buttermilk."

Butter

Meaning: Fatty substance obtained from milk

अर्थ: मक्खन

"Butter floats after churning."

Buttermilk

Meaning: Liquid left after churning curd

अर्थ: छाछ

"Buttermilk is refreshing in summer."

Magnet

Meaning: An object that attracts iron

अर्थ: चुंबक

"They used a magnet to pick up nails."

Magnetic substance

Meaning: Material attracted by magnet

अर्थ: चुंबकीय पदार्थ

"Iron is a magnetic substance."

Magnetic separation

Meaning: Using magnet to separate substances

अर्थ: चुंबकीय पृथक्करण

"Magnetic separation removed iron nails."

Recycle

Meaning: To process waste to use again

अर्थ: पुनर्चक्रण

"Scrap iron can be recycled."

Scrap

Meaning: Waste pieces of material

अर्थ: कबाड़

"Scrap iron was collected from the heap."

Harvested

Meaning: Crops that have been cut and collected

अर्थ: कटाई किया हुआ

"Harvested wheat was lying in the fields."

Stirring

Meaning: Mixing by moving a spoon or stick

अर्थ: हिलाना/घोलना

"Stirring helps in dissolving sugar in tea."

Settled

Meaning: Came to rest at the bottom

अर्थ: जमा हुआ

"Mud settled at the bottom of the jar."

Undisturbed

Meaning: Left without touching or moving

अर्थ: अछूता/न छेड़ा हुआ

"Leave the tea undisturbed for a while."

Drains

Meaning: Allows liquid to flow away

अर्थ: निकासी

"Water drains out of the fishing net."

Impurities

Meaning: Unwanted particles in a substance

अर्थ: अशुद्धियाँ

"The filter removed impurities from water."

Expose

Meaning: To leave without cover

अर्थ: उजागर करना

"The seawater was exposed to sunlight."

Folk songs

Meaning: Traditional songs of people

अर्थ: लोकगीत

"Farmers sang folk songs while threshing."

Straw

Meaning: Dry stalk of grain plants

अर्थ: पराली/तिनका

"Straw is used for cattle feed."

Particles

Meaning: Tiny bits or pieces of matter

अर्थ: कण

"Sieving separates larger and smaller particles."

Substance

Meaning: A kind of matter with uniform properties

अर्थ: पदार्थ

"Salt is a substance dissolved in seawater."

Separation

Meaning: The process of dividing into parts

अर्थ: पृथक्करण

"Separation methods make mixtures useful."

← Previous

Ch 8: A Journey Through States of Water

Ch 10: Living Creatures

NCERT Solutions Class 6 Science Chapter 9 – Methods of Separation in Everyday Life

Chapter Introduction

Watch Video Lecture

Important Points

Practice MCQ Questions (40 questions)

Q1. What method is used to separate grain from straw by throwing it in air?

Q2. What method is used to remove tea leaves from tea?

Q3. What method uses a magnetic material to separate iron from a mixture?

Q4. What is sedimentation?

Q5. What is the process of carefully pouring liquid without disturbing the settled sediment called?

Q6. Which method is used to obtain salt from salt water?

Q7. What method is used to separate stones from rice by hand?

Q8. What type of mixture is formed when sugar is dissolved in water?

Q9. Which method separates components based on their different boiling points?

Q10. Why do heavier particles settle in sedimentation?

Q11. How does sieving work to separate mixtures?

Q12. Why is filtration used after sedimentation in water purification?

Q13. In salt production from sea water, why is evaporation the key method used?

Q14. Why is magnetic separation useful in industry?

Q15. What is chromatography used for?

Q16. Why is threshing used in agriculture?

Q17. How does distillation produce pure water from salt water?

Q18. Why is it important to separate mixtures before use?

Q19. How does centrifugation separate components of a mixture?

Q20. A farmer has a mixture of wheat grains, chaff, and small stones. What sequence of methods should they use to get clean grain?

Q21. Why is water from a river not safe to drink directly, and what simple methods can purify it?

Q22. How does the process of making tea demonstrate a method of separation?

Q23. Why would distillation be preferred over simple evaporation when separating sea water into pure water and salt?

Q24. How is chromatography used to identify if a sample of ink is pure or a mixture?

Q25. A laboratory needs to separate a mixture of iron powder and sulphur powder. What method is most appropriate and why?

Q26. Why are different separation methods needed for different types of mixtures?

Q27. How does the separation of cream from milk demonstrate a real-world application of centrifugation?

Q28. Which of the following are methods of separating mixtures based on differences in density?

Q29. Which of the following separation methods use the property of solubility?

Q30. Which of the following are examples of separation methods used in everyday life?

Q31. Water purification plants use multiple steps to clean river water. Which sequence of steps and methods is most logical?

Q32. Why is it important that separation methods are non-destructive (should not chemically change the components)?

Q33. In forensic science (crime investigation), how might chromatography be used?

Q34. Hospitals use centrifuges to separate blood into its components. Why is this separation important?

Q35. How does the concept of separation apply to environmental remediation (cleaning up oil spills)?

Q36. Which of the following are reasons why water from a well or river must be treated before drinking?

Q37. Which of the following correctly describe properties that determine which separation method to use?

Q38. Which of the following are industrial applications of separation methods?

Q39. Which of the following statements correctly describe filtration?

Q40. Which separation methods are used in producing food and beverages?