Class 6 Science Chapter 6 Extra Questions and Answers – Materials Around Us
Class 6 Science Chapter 6 Extra Questions and Answers for “Materials Around Us” (based on NCERT textbook Curiosity ).
EXTRA IMPORTANT QUESTIONS WITH ANSWERS – Chapter 6 – Materials Around Us
This includes All types of Questions normally asked in school exams, tests, and NCERT exercises.
CLASS 6 SCIENCE
CHAPTER 6 – MATERIALS AROUND US
EXTRA IMPORTANT QUESTIONS AND ANSWERS
Q1. What is meant by a material?
Answer: Any substance that is used to create or make an object is called a material.
Q2. Why do we see so many different types of materials around us?
Answer: Because different materials have different properties, and objects require materials with suitable properties for specific purposes.
Q3. Why do we classify materials?
Answer: To study their properties easily, identify similarities and differences, and understand their uses.
Q4. Give two examples where one object is made from different materials.
Answer: A pen (plastic, metal, ink); A chair (wood, plastic, metal).
Q5. Give two examples where one material is used to make different objects.
Answer: Wood (table, chair, door); Plastic (bottle, bucket, toys).
Q6. Why is it important to choose the right material for making an object?
Answer: Because each material has specific properties, and the performance of the object depends on those properties.
Q7. Why cannot a cloth tumbler hold water?
Answer: Because cloth absorbs water and cannot retain liquids.
Q8. Why are cooking utensils not made of paper?
Answer: Because paper burns easily and cannot resist heat.
Q9. Why are sports balls made of different materials?
Answer: Because each sport requires balls with specific bounce, hardness, weight, and flexibility.
Q10. What is meant by lustrous?
Answer: Materials that have a shiny surface are called lustrous.
Q11. Why do metals lose their shine when left in air?
Answer: Because air and moisture cause them to react and form a dull layer on the surface.
Q12. What are non-lustrous materials?
Answer: Materials that do not shine, such as wood, rubber, and paper.
Q13. How is lustre helpful in identifying metals?
Answer: Most metals have a natural shine, making this a distinguishing property.
Q14. What are hard materials?
Answer: Materials that are difficult to compress or scratch, such as iron or stone.
Q15. What are soft materials?
Answer: Materials that can be easily compressed or scratched, such as cotton or sponge.
Q16. Give two examples of transparent materials.
Answer: Glass, clear water.
Q17. Give two examples of translucent materials.
Answer: Butter paper, frosted glass.
Q18. Give two examples of opaque materials.
Answer: Wood, metal.
Q19. Why is frosted glass not completely transparent?
Answer: Because it has a rough or hazy surface that scatters light, making objects appear unclear.
Q20. Is water transparent? Explain.
Answer: Yes, water is transparent because objects can be seen clearly through it.
Q21. Give a situation where transparent materials are useful.
Answer: Windows, so that light can enter and objects outside can be seen.
Q22. What does solubility mean?
Answer: The ability of a substance to dissolve in water.
Q23. Name two soluble materials.
Answer: Salt, sugar.
Q24. Name two insoluble materials.
Answer: Sand, sawdust.
Q25. Why do we call water a good solvent?
Answer: Because many substances dissolve in it.
Q26. Give an example of a gas that dissolves in water.
Answer: Oxygen.
Q27. Why is dissolved oxygen in water important?
Answer: It is essential for the survival of aquatic plants and animals.
Q28. What is mass?
Answer: The quantity of matter in an object.
Q29. What is volume?
Answer: The space occupied by matter.
Q30. How can we measure mass?
Answer: By using a balance.
Q31. Why did the two identical tumblers in the activity show different water levels?
Answer: Because the volume of water poured into them was different.
Q32. What does 500 mL written on a water bottle indicate?
Answer: It indicates the volume of water the bottle contains.
Q33. What is matter?
Answer: Anything that has mass and occupies space.
Q34. Is air matter? Give a reason.
Answer: Yes, air is matter because it has mass and occupies space.
Q35. Name two ancient methods of classifying matter mentioned in the chapter.
Answer:
(i) Harappan pottery classification
(ii) Ayurveda’s twenty properties (guṇa)
Q36. Give two advantages of plastic.
Answer: Lightweight, durable, waterproof.
Q37. Give two disadvantages of plastic.
Answer: Non-biodegradable, harmful for the environment.
Q38. What property is shown when a material can be scratched easily?
Answer: Softness.
Q39. What property is shown when a material bounces when dropped?
Answer: Elasticity or resilience.
Q40. Why does a cricket ball not bounce like a tennis ball?
Answer: Because it is harder and made of different materials.
Q41. Why is metal preferred for making cooking utensils?
Answer: Because metals conduct heat well and are strong.
Q42. Why is wood used for making furniture?
Answer: Because it is hard, strong, durable, and non-conductive.
Q43. Why are glass containers preferred for storing pickles?
Answer: Because glass does not react with food.
Q44. Why are paper bags not suitable for storing liquids?
Answer: Because paper absorbs water and tears easily.
Q45. What is the use of classifying materials based on hardness?
Answer: To decide which materials are suitable for construction or tools.
Q46. What property helps us identify materials that burn easily?
Answer: Combustibility.
Q47. Why does sawdust float on water?
Answer: Because it is less dense than water and insoluble.
Q48. Why does sugar disappear when stirred in water?
Answer: Because it dissolves completely (soluble).
Q49. Why does sand settle at the bottom of water?
Answer: Because it is insoluble and heavier than water.
Q50. What is the difference between translucent and transparent?
Answer:
Transparent: objects can be seen clearly.
Translucent: objects can be seen but not clearly.
Q51. What is meant by the term “capacity”?
Answer: The maximum volume a container can hold.
Q52. Why is classification helpful for shopkeepers?
Answer: It helps them arrange items systematically for quick access.
Q53. Why do we prefer opaque materials for making doors and walls?
Answer: For privacy and security.
Q54. Which property makes metals suitable for making wires?
Answer: Ductility.
Q55. Which property makes glass suitable for laboratory beakers?
Answer: Transparency and resistance to chemicals.
Q56. Why is cotton used for making clothes?
Answer: Because it is soft, comfortable, and absorbs sweat.
Q57. Why do we use steel for making bridges?
Answer: Because it is very strong and durable.
Q58. What is meant by “settling” of materials?
Answer: When insoluble substances sink to the bottom of water.
Q59. Why do gases mix completely with air?
Answer: Because gas particles move freely and spread quickly.
Q60. Why are nails made of iron instead of aluminium foil?
Answer: Because iron is hard and strong, whereas aluminium foil is soft and easily bendable.