Important Questions Class 6 Science Chapter 6: Materials Around Us

Materials are substances used to make objects around us.
Objects can be grouped by properties such as lustre, hardness, transparency, solubility, mass and volume.

Materials Around Us explains how objects differ because they are made from different substances such as paper, wood, cloth, glass, metal, plastic, clay and rubber. Important Questions Class 6 Science Chapter 6 help students practise materials, classification, properties of materials, lustrous and non-lustrous materials, hard and soft materials, transparent, translucent and opaque materials, soluble and insoluble materials, mass, volume and matter. The CBSE 2026 chapter also explains how material properties decide the use of objects in daily life.

Key Takeaways

• Material: Any substance used to make an object is called a material.
• Classification: Objects and materials can be grouped using common properties.
• Matter: Anything that occupies space and has mass is called matter.
• Volume: The space occupied by matter is called volume.

Important Questions Class 6 Science Chapter 6 Structure 2026

Important Questions Class 6 Science Chapter 6 with Answers

Materials Around Us introduces objects, materials, classification and matter through daily life examples.
Students should connect every answer with a property such as shine, hardness, transparency, solubility, mass or volume.
These materials around us class 6 questions follow the NCERT 2026 chapter flow.

1. What does Important Questions Class 6 Science Chapter 6 mainly teach?

Important Questions Class 6 Science Chapter 6 mainly teach materials, classification, material properties, solubility, mass, volume and matter. The chapter explains how material properties decide object use.

1. Material Skill: Identify what an object is made of.
2. Classification Skill: Group objects by common properties.
3. Property Skill: Compare lustre, hardness, transparency and solubility.
4. Matter Skill: Identify things with mass and volume.
5. Final Result: Chapter 6 teaches classification of materials by properties.

2. What is the name of Class 6 Science Chapter 6?

The name of Class 6 Science Chapter 6 is Materials Around Us. It studies materials used to make objects in daily life.

1. Chapter Number: 6.
2. Chapter Name: Materials Around Us.
3. Textbook: Curiosity.
4. Final Result: Chapter 6 is about materials and their properties.

3. Why do we study materials around us?

We study materials because objects are made from different substances. Their properties decide how those objects are used.

1. Notebook: Made from paper.
2. Pen: Made from plastic, metal and ink.
3. Tumbler: Made from glass, steel, plastic or clay.
4. Final Result: Materials decide the usefulness of objects.

Class 6 Science Chapter 6 Important Questions

Class 6 Science Chapter 6 important questions focus on identifying and grouping materials.
The chapter begins with classroom objects such as notebooks, pens, bottles, tables and sweaters.
Students should answer with examples from common objects.

4. What is a material?

A material is any substance used to create an object. Paper, wood, cloth, glass, metal, plastic and clay are materials.

1. Paper: Used to make notebooks.
2. Wood: Used to make tables.
3. Glass: Used to make tumblers.
4. Final Result: A material is the substance from which an object is made.

5. Can one object be made from many materials?

Yes, one object can be made from many materials. A pen may contain plastic, metal and ink.

1. Outer Body: Plastic.
2. Tip: Metal.
3. Writing Material: Ink.
4. Final Result: One object can contain different materials.

6. Can one material be used to make many objects?

Yes, one material can be used to make many objects. Plastic can be used for bottles, rulers, boxes and chairs.

1. Bottle: Can be plastic.
2. Ruler: Can be plastic.
3. Chair: Can be plastic.
4. Final Result: One material can make many objects.

7. Why is paper not suitable for cooking utensils?

Paper is not suitable for cooking utensils because it cannot withstand heat and hold hot food safely. Cooking utensils need heat-resistant materials.

1. Cooking: Needs heating.
2. Paper: Burns or tears easily.
3. Better Material: Metal.
4. Final Result: Cooking utensils are usually made from metals.

8. Why cannot a cloth tumbler store water?

A cloth tumbler cannot store water because cloth absorbs and lets water pass through. A tumbler needs a material that can hold water.

1. Cloth: Absorbs water.
2. Water Storage: Needs a non-leaking material.
3. Better Materials: Steel, glass, plastic or clay.
4. Final Result: Cloth is unsuitable for storing water.

Materials Used to Make Objects Class 6

Materials used to make objects class 6 questions show how purpose decides material choice.
A chair, bottle, tumbler or ball can be made from different materials.
The best material depends on strength, weight, flexibility, comfort and use.

9. What materials can be used to make a tumbler?

A tumbler can be made from steel, glass, plastic or clay. The material must be able to hold water.

1. Steel Tumbler: Strong and durable.
2. Glass Tumbler: Transparent and smooth.
3. Plastic Tumbler: Light and easy to carry.
4. Final Result: A tumbler needs a water-holding material.

10. Why are different materials used to make balls for different sports?

Different balls need different bounce, hardness, weight and texture. A tennis ball and cricket ball serve different purposes.

1. Tennis Ball: Needs good bounce.
2. Cricket Ball: Needs hardness and weight.
3. Exercise Ball: Needs softness and grip.
4. Final Result: Sports balls use materials based on the game.

11. Can a cricket ball be used to play tennis?

A cricket ball is not suitable for tennis because it is harder and heavier. Tennis needs a ball that bounces properly on the court.

1. Cricket Ball: Hard and heavy.
2. Tennis Ball: Lighter and bouncy.
3. Game Need: Different bounce and safety.
4. Final Result: Different sports need different ball materials.

12. Why are chairs made from different materials?

Chairs are made from wood, plastic, iron, bamboo, cement or stone because uses differ. Material choice depends on strength, weight and comfort.

1. Wooden Chair: Strong and comfortable.
2. Plastic Chair: Light and movable.
3. Iron Chair: Strong and durable.
4. Final Result: Chair material depends on its purpose.

13. Why do shopkeepers use transparent containers?

Shopkeepers use transparent containers because customers can see the contents clearly. This helps identify items without opening containers.

1. Transparent Container: Shows stored material.
2. Use: Saves time.
3. Example: Jars for pulses, biscuits or sweets.
4. Final Result: Transparent containers make contents visible.

Classification of Materials Class 6 Questions

Classification of materials class 6 questions explain grouping by common properties.
Objects can be grouped by shape, colour, hardness, softness, shine or material.
Classification helps us study patterns easily.

14. What is classification?

Classification is the method of arranging objects into groups. The groups are made using common properties.

1. Property: Shape, colour or material.
2. Action: Arrange objects into groups.
3. Purpose: Study objects easily.
4. Final Result: Classification means grouping by common property.

15. Why is classification useful?

Classification is useful because it helps us organise objects and study patterns. It also makes searching and comparison easier.

1. Kitchen Example: Similar utensils are kept together.
2. Grocery Example: Spices and pulses are placed separately.
3. Science Example: Materials are grouped by properties.
4. Final Result: Classification makes study and organisation easier.

16. On what basis can objects be classified?

Objects can be classified by shape, colour, hardness, softness, shine, material, transparency or solubility. The chosen property depends on purpose.

1. Shape: Round or rectangular.
2. Colour: Red, blue or black.
3. Material: Wood, metal or plastic.
4. Final Result: Objects can be grouped using many properties.

17. How are kitchen objects commonly classified?

Kitchen objects are commonly classified by use and type. Similar utensils, spices, pulses and grains are kept together.

1. Utensils: Plates and bowls together.
2. Spices: Kept in one place.
3. Grains: Stored separately.
4. Final Result: Kitchen sorting is an example of classification.

18. Why do chemist shops arrange medicines in groups?

Chemist shops arrange medicines in groups to find them quickly and safely. Grouping helps avoid confusion.

1. Medicine Type: Kept category-wise.
2. Searching: Becomes faster.
3. Safety: Reduces mistakes.
4. Final Result: Grouping medicines improves organisation.

Properties of Materials Class 6 Questions

Properties of materials class 6 questions explain how materials look and behave.
Materials may differ in lustre, hardness, transparency, solubility, mass and volume.
These properties decide their uses.

19. What are properties of materials?

Properties of materials are features that help describe and compare them. Examples include lustre, hardness, softness, transparency and solubility.

1. Appearance: Shiny or dull.
2. Feel: Hard or soft.
3. Water Behaviour: Soluble or insoluble.
4. Final Result: Material properties help identify and classify materials.

20. Why do we choose materials based on properties?

We choose materials based on properties because each object has a purpose. A cooking vessel, chair or bottle needs suitable material.

1. Cooking Vessel: Needs heat resistance.
2. Chair: Needs strength.
3. Bottle: Needs ability to hold liquid.
4. Final Result: Object use decides material choice.

21. Name four properties used to classify materials.

Four properties used to classify materials are lustre, hardness, transparency and solubility. Mass and volume are also important properties.

1. Lustre: Shiny or dull.
2. Hardness: Hard or soft.
3. Transparency: Clear, hazy or blocked.
4. Solubility: Dissolves or does not dissolve.
5. Final Result: Materials can be grouped by observable properties.

22. Do all materials have the same properties?

No, all materials do not have the same properties. Wood, glass, metal, cloth and plastic behave differently.

1. Glass: Transparent.
2. Wood: Opaque.
3. Metal: Usually lustrous and hard.
4. Final Result: Different materials show different properties.

23. Which properties are possessed by all materials?

All materials have mass and occupy space. These two properties make them examples of matter.

1. Mass: Amount of matter.
2. Volume: Space occupied.
3. Examples: Water, sand, pebbles and cup.
4. Final Result: All materials have mass and volume.

Lustrous and Non Lustrous Materials Class 6

Lustrous and non lustrous materials class 6 questions focus on appearance.
Materials that shine are called lustrous, while materials that do not shine are called non-lustrous.
Metals usually show lustre on freshly cut surfaces.

24. What are lustrous materials?

Lustrous materials have shiny surfaces. Metals such as iron, copper, zinc, aluminium and gold are usually lustrous.

1. Iron: Lustrous on fresh surface.
2. Copper: Shiny reddish metal.
3. Aluminium: Shiny silvery metal.
4. Final Result: Lustrous materials show shine.

25. What are non-lustrous materials?

Non-lustrous materials do not have shiny surfaces. Paper, wood, rubber and jute are examples.

1. Paper: Dull.
2. Wood: Usually dull when unpolished.
3. Rubber: Non-lustrous.
4. Final Result: Non-lustrous materials do not shine.

26. Why do some metals look dull?

Some metals look dull because air and moisture affect their surface. Freshly cut metal surfaces often show lustre.

1. Air: Affects surface.
2. Moisture: Causes dullness.
3. Fresh Cut: Shows shine.
4. Final Result: Metals may lose lustre due to air and moisture.

27. Are all shiny materials metals?

No, all shiny materials are not metals. Some surfaces become shiny due to polishing or coating.

1. Polish: Can make surfaces shine.
2. Coating: Plastic or wax can create shine.
3. Old Saying: All that glitters is not gold.
4. Final Result: Shine alone does not prove a material is metal.

28. Give two examples of lustrous and non-lustrous materials.

Copper and aluminium are lustrous materials, while wood and rubber are non-lustrous materials. Lustre means shine.

1. Lustrous Example 1: Copper.
2. Lustrous Example 2: Aluminium.
3. Non-lustrous Example 1: Wood.
4. Non-lustrous Example 2: Rubber.
5. Final Result: Metals are usually lustrous, while wood and rubber are not.

Hard and Soft Materials Class 6 Questions

Hard and soft materials class 6 questions compare how materials respond to pressing or scratching.
Hard materials are difficult to compress or scratch.
Soft materials can be compressed or scratched more easily.

29. What are hard materials?

Hard materials are difficult to compress or scratch. Stone, iron and brick are common hard materials.

1. Stone: Hard.
2. Iron: Hard.
3. Brick: Hard.
4. Final Result: Hard materials resist pressing and scratching.

30. What are soft materials?

Soft materials can be compressed or scratched easily. Sponge, pillow and eraser are common soft materials.

1. Sponge: Compresses easily.
2. Pillow: Soft to press.
3. Eraser: Can be scratched.
4. Final Result: Soft materials change shape more easily under pressure.

31. Is hardness a relative property?

Yes, hardness is relative. Rubber is harder than sponge but softer than iron.

1. Sponge: Softer than rubber.
2. Rubber: Softer than iron.
3. Iron: Harder than rubber.
4. Final Result: Hardness depends on comparison.

32. How can we test whether a material is hard or soft?

We can press the material or try to scratch it with another object. Materials that resist compression or scratching are hard.

1. Press Test: Check if shape changes.
2. Scratch Test: Use a metal key carefully.
3. Observation: Easy scratch means softer material.
4. Final Result: Hardness can be tested by pressing or scratching.

33. Why is iron used for strong objects?

Iron is used for strong objects because it is hard and durable. It does not bend or scratch easily compared with soft materials.

1. Property: Hardness.
2. Use: Tools, gates and machine parts.
3. Reason: Strong objects need hard materials.
4. Final Result: Iron is useful where strength is needed.

Transparent Translucent Opaque Class 6 Questions

Transparent translucent opaque class 6 questions explain how materials allow light to pass.
Transparent materials allow clear view.
Translucent materials allow unclear view, and opaque materials block view.

34. What are transparent materials?

Transparent materials allow us to see objects clearly through them. Glass, water, air and cellophane paper are examples.

1. Glass: Transparent.
2. Water: Transparent when clean.
3. Air: Transparent.
4. Final Result: Transparent materials allow clear vision.

35. What are opaque materials?

Opaque materials do not allow us to see through them. Wood, cardboard and metals are examples.

1. Wood: Opaque.
2. Cardboard: Opaque.
3. Metal: Opaque.
4. Final Result: Opaque materials block vision.

36. What are translucent materials?

Translucent materials allow objects to be seen, but not clearly. Butter paper and frosted glass are examples.

1. Butter Paper: Translucent.
2. Frosted Glass: Translucent.
3. View: Hazy or unclear.
4. Final Result: Translucent materials allow unclear vision.

37. Why could Sheeta’s brother see through the glass window?

Sheeta’s brother could see through the glass window because clear glass is transparent. It allows objects to be seen clearly.

1. Material: Glass.
2. Property: Transparent.
3. Effect: Clear view.
4. Final Result: Transparent glass allows clear vision.

38. Why could Sara hide behind a frosted glass door?

Sara could hide behind a frosted glass door because frosted glass is translucent. It allows a hazy view, not a clear one.

1. Material: Frosted glass.
2. Property: Translucent.
3. View: Objects are not clear.
4. Final Result: Frosted glass gives unclear vision.

39. Why can we not see through a wooden door?

We cannot see through a wooden door because wood is opaque. It does not allow clear viewing through it.

1. Material: Wood.
2. Property: Opaque.
3. Effect: Blocks view.
4. Final Result: Wooden doors are opaque.

40. Classify glass tumbler, butter paper and wooden board.

A glass tumbler is transparent, butter paper is translucent, and a wooden board is opaque. The classification depends on visibility.

1. Glass Tumbler: Transparent.
2. Butter Paper: Translucent.
3. Wooden Board: Opaque.
4. Final Result: Visibility decides transparent, translucent or opaque grouping.

Soluble and Insoluble Materials Class 6 Questions

Soluble and insoluble materials class 6 questions explain how materials behave in water.
Some materials disappear in water after stirring.
Some remain unchanged even after stirring.

41. What are soluble materials?

Soluble materials dissolve in water and disappear after stirring. Sugar and salt are soluble in water.

1. Sugar: Dissolves in water.
2. Salt: Dissolves in water.
3. Result: Mixture looks uniform.
4. Final Result: Soluble materials dissolve in water.

42. What are insoluble materials?

Insoluble materials do not dissolve in water. Sand, chalk powder and sawdust do not disappear in water.

1. Sand: Insoluble.
2. Chalk Powder: Insoluble.
3. Sawdust: Insoluble.
4. Final Result: Insoluble materials do not dissolve in water.

43. Why do sugar and salt disappear in water?

Sugar and salt disappear because they dissolve in water. They mix completely with water after stirring.

1. Sugar: Soluble.
2. Salt: Soluble.
3. Stirring: Helps mixing.
4. Final Result: Sugar and salt are soluble in water.

44. Does everything put in water disappear?

No, everything put in water does not disappear. Some materials dissolve, while others remain insoluble.

1. Disappears: Sugar.
2. Does Not Disappear: Sand.
3. Reason: Solubility differs.
4. Final Result: Different materials behave differently in water.

45. Why is water important for the body?

Water is important because it dissolves many materials needed by the body. This property helps body functions.

1. Solvent: Water dissolves many substances.
2. Body Function: Dissolved materials move inside body.
3. Example: Salt and sugar dissolve in water.
4. Final Result: Water helps transport dissolved substances.

46. Why is oxygen dissolved in water important?

Oxygen dissolved in water is important for aquatic animals and plants. It helps them survive.

1. Gas: Oxygen.
2. Medium: Water.
3. Use: Aquatic life needs dissolved oxygen.
4. Final Result: Dissolved oxygen supports life in water.

47. How is ORS prepared at home?

ORS can be prepared by mixing six teaspoons of sugar and half a teaspoon of common salt in one litre of boiled and cooled water. It helps treat dehydration.

1. Water: One litre.
2. Sugar: Six teaspoons.
3. Salt: Half teaspoon.
4. Final Result: Home ORS uses sugar, salt and clean water.

Mass and Volume Class 6 Questions

Mass and volume class 6 questions explain properties found in all materials.
Mass tells the amount of matter.
Volume tells the space occupied by matter.

48. What is mass?

Mass is the quantity of matter present in an object. Its common units are gram and kilogram.

1. More Mass: Heavier object.
2. Less Mass: Lighter object.
3. SI Unit: Kilogram.
4. Final Result: Mass tells how much matter an object has.

49. What is volume?

Volume is the space occupied by matter. Liquids are often measured in litre and millilitre.

1. Water Bottle: May contain 500 mL.
2. Milk Packet: May contain 500 mL.
3. SI Unit: Cubic metre.
4. Final Result: Volume tells how much space matter occupies.

50. How are heavy and light objects related to mass?

A heavier object has more mass, while a lighter object has less mass. Mass can be measured using a balance.

1. Pebbles Cup: May be heavier.
2. Water Cup: May be lighter than pebbles.
3. Balance: Used to compare mass.
4. Final Result: Heaviness depends on mass.

51. Why do water levels differ in identical tumblers?

Water levels differ because the amount of water in each tumbler is different. More water occupies more space.

1. Same Tumbler: Same capacity.
2. Different Water Amount: Different volume.
3. Higher Level: Greater volume of water.
4. Final Result: Water level shows volume difference.

52. What units are used for mass and volume?

Mass is measured in gram and kilogram. Volume is measured in litre, millilitre and cubic metre.

1. Mass Unit: g or kg.
2. Volume Unit: L, mL or m³.
3. Relation: 1 m³ = 1000 L.
4. Final Result: Mass and volume use different units.

53. How should 7 kilograms be written correctly?

Seven kilograms should be written as 7 kg. There should be a space between the number and the unit.

1. Correct Form: 7 kg.
2. Incorrect Form: 7 kgs.
3. Unit Symbol: kg has no full stop unless sentence ends.
4. Final Result: The correct writing is 7 kg.

54. How should 500 millilitres be written correctly?

Five hundred millilitres should be written as 500 mL. The m is small and L is capital.

1. Correct Form: 500 mL.
2. Incorrect Form: 500 ml.
3. Unit Symbol: mL.
4. Final Result: The correct writing is 500 mL.

Matter Class 6 Science Questions

Matter class 6 science questions connect materials with mass and volume.
Anything that has mass and occupies space is matter.
Water, sand, pebbles, air and cups are examples of matter.

55. What is matter?

Matter is anything that occupies space and has mass. Water, sand, pebbles and cups are examples.

1. Property 1: Has mass.
2. Property 2: Occupies space.
3. Examples: Water, sand and cup.
4. Final Result: Matter has mass and volume.

56. Is air matter?

Yes, air is matter because it has mass and occupies space. We may not see it, but it is present around us.

1. Air: Occupies space.
2. Air: Has mass.
3. Visibility: It is mostly not seen.
4. Final Result: Air is matter.

57. Is water matter?

Yes, water is matter because it occupies space and has mass. It also has measurable volume.

1. Mass: Water can be weighed.
2. Volume: Water can be measured in L or mL.
3. Example: 500 mL water bottle.
4. Final Result: Water is matter.

58. Are all materials examples of matter?

Yes, all materials are examples of matter because they have mass and occupy space. Materials are types of matter used to make objects.

1. Wood: Matter.
2. Glass: Matter.
3. Plastic: Matter.
4. Final Result: Materials are matter used for making objects.

59. What is the difference between material and matter?

Matter is anything that has mass and occupies space, while material is matter used to make objects. Wood is matter and also a material for furniture.

1. Matter: General term.
2. Material: Used to make objects.
3. Example: Clay used to make pots.
4. Final Result: All materials are matter, but material refers to object-making use.

NCERT Class 6 Science Chapter 6 Questions

NCERT Class 6 Science Chapter 6 questions test grouping, definitions, true-false and material choice.
Students should answer with direct examples from objects around them.
These NCERT Class 6 Science Chapter 6 questions follow the exercise pattern.

60. Unscramble T R E M A T and match its property.

T R E M A T unscrambles to matter. Matter occupies space and has mass.

1. Unscrambled Word: Matter.
2. Property 1: Occupies space.
3. Property 2: Has mass.
4. Final Result: Matter has mass and volume.

61. Unscramble U L S B E L O and match its property.

U L S B E L O unscrambles to soluble. A soluble material mixes completely in water.

1. Unscrambled Word: Soluble.
2. Property: Mixes in water.
3. Example: Sugar.
4. Final Result: Soluble means dissolves in water.

62. Unscramble T N E R P A S N A R T and match its property.

T N E R P A S N A R T unscrambles to transparent. Objects can be seen clearly through transparent materials.

1. Unscrambled Word: Transparent.
2. Property: Clear visibility.
3. Example: Glass.
4. Final Result: Transparent materials allow clear vision.

63. Unscramble E R U S T L and match its property.

E R U S T L unscrambles to lustre. Lustre means shiny surface.

1. Unscrambled Word: Lustre.
2. Property: Shine.
3. Example: Fresh metal surface.
4. Final Result: Lustre means shiny appearance.

64. Why are containers used in shops usually transparent?

Containers in shops are usually transparent because contents can be seen clearly. This helps customers and shopkeepers identify materials quickly.

1. Visibility: Clear view of contents.
2. Time Saving: No need to open every container.
3. Example: Pulses and sweets in glass jars.
4. Final Result: Transparent containers make stored items visible.

65. Correct the false statement: Wood is translucent while glass is opaque.

The correct statement is wood is opaque, while glass is transparent. Wood blocks vision, and glass allows clear view.

1. Wood: Opaque.
2. Glass: Transparent.
3. Reason: Visibility differs.
4. Final Result: Wood is opaque and glass is transparent.

66. Is the statement “Aluminium foil has lustre while an eraser does not” true?

Yes, the statement is true. Aluminium foil has shine, while an eraser is usually non-lustrous.

1. Aluminium Foil: Lustrous.
2. Eraser: Non-lustrous.
3. Property: Appearance.
4. Final Result: Aluminium foil has lustre.

67. Is the statement “Sugar dissolves in water whereas sawdust does not” true?

Yes, the statement is true. Sugar is soluble in water, while sawdust is insoluble.

1. Sugar: Soluble.
2. Sawdust: Insoluble.
3. Water Test: Sugar disappears, sawdust remains.
4. Final Result: Sugar dissolves, sawdust does not.

68. Correct the false statement: An apple is matter because it occupies no space and has mass.

The correct statement is an apple is matter because it occupies space and has mass. Both properties are needed for matter.

1. Apple: Has mass.
2. Apple: Occupies space.
3. Matter Rule: Mass plus volume.
4. Final Result: An apple is matter.

69. Which materials are best for strong chairs?

Wood, iron, cement and stone can make strong chairs because they are hard. Plastic and bamboo may be lighter.

1. Hard Material: Iron.
2. Hard Material: Wood.
3. Hard Material: Stone.
4. Final Result: Strong chairs need hard materials.

70. Which material is useful for a lightweight chair?

Plastic or bamboo is useful for a lightweight chair. These materials are easier to move than iron or stone.

1. Plastic: Light and easy to carry.
2. Bamboo: Light and strong.
3. Use: Movable chair.
4. Final Result: Plastic and bamboo suit lightweight chairs.

71. Which material should be used for broken glass waste container?

A hard and strong material such as thick plastic or metal should be used. The container should not tear easily.

1. Waste Type: Broken glass.
2. Needed Property: Hardness and strength.
3. Suitable Material: Metal or thick plastic.
4. Final Result: Broken glass needs a strong container.

72. Which material should be used for wastepaper container?

A cardboard, plastic or metal container can be used for wastepaper. The material should be light and easy to handle.

1. Waste Type: Paper.
2. Needed Property: Lightness.
3. Suitable Material: Cardboard or plastic.
4. Final Result: Wastepaper can be collected in a light container.

73. Air is transparent and wooden door is what?

Air is transparent, and a wooden door is opaque. Air allows us to see, but wood blocks vision.

1. Air: Transparent.
2. Wooden Door: Opaque.
3. Reason: Visibility through material differs.
4. Final Result: Air is transparent and wood is opaque.

Class 6 Science Chapter 6 Answers

Class 6 Science Chapter 6 answers should use simple examples from daily life.
Students should explain the property first and then give an object example.
These Class 6 Science Chapter 6 answers support quick revision.

74. Give an example of a hard and soluble material.

Common salt is hard and soluble in water. It feels like solid crystals but disappears after stirring in water.

1. Material: Salt.
2. Hardness: Crystal form is hard.
3. Solubility: Dissolves in water.
4. Final Result: Salt is hard and soluble in water.

75. Give an example of a soft and insoluble material.

Sawdust can be considered soft and insoluble in water. It does not disappear after stirring.

1. Material: Sawdust.
2. Softness: Light and easy to press.
3. Water Behaviour: Insoluble.
4. Final Result: Sawdust is soft and insoluble in water.

76. What can be used to make ORS at home?

ORS can be made using sugar, common salt and boiled cooled water. The mixture helps during dehydration.

1. Sugar: Six teaspoons.
2. Salt: Half teaspoon.
3. Water: One litre.
4. Final Result: ORS uses sugar, salt and clean water.

77. Why is plastic both useful and harmful?

Plastic is useful because it is light, durable and can be shaped easily. It becomes harmful when discarded carelessly.

1. Usefulness: Light and strong.
2. Problem: Waste builds up.
3. Action: Reduce, reuse and recycle.
4. Final Result: Plastic can be a boon or bane depending on use.

78. Why do recyclers buy old objects based on material properties?

Recyclers buy objects based on properties because materials can be reused or processed differently. Metal, paper, glass and plastic have different recycling values.

1. Metal: Can be melted.
2. Paper: Can be recycled.
3. Glass: Can be reused or processed.
4. Final Result: Recycling depends on material type and property.

Class 6 Science Important Links