Mastery

Materials Around Us — Mastery

30 questions 30 min Full-chapter mastery

Q1. According to the chapter's 'Do you know?' box on Sindhu-Sarasvatī pottery, baked clay used for making pots is called
- A. Mortar
- B. Terracotta
- C. Plaster
- D. Cement
Q2. A cricket ball, a tennis ball and a hand-exercise ball are of nearly the same size but made of different materials. The best reason given in Activity 6.4 is that
- A. Colour decides the sport
- B. Heavier balls are always for indoor games
- C. Different sports need different properties — like bounce, hardness or grip
- D. All balls should ideally be made of one material
Q3. The chapter says we find grouping useful because it helps us
- A. Memorise the dictionary
- B. Study and observe patterns in the properties of things
- C. Increase the mass of materials
- D. Make materials transparent
Q4. A grocer in Pune keeps spices in one corner, pulses in another, and grains in a third. According to the chapter, this practice best demonstrates that classification is based on
- A. The mass of each item
- B. Their transparency
- C. Their lustre
- D. A common property they share — being the same kind of food item
Q5. Which statement best describes non-lustrous materials as defined in the chapter?
- A. Materials that do not have a shiny surface
- B. Materials that are always heavy
- C. Materials that dissolve in water
- D. Materials that allow light to pass clearly
Q6. Priya presses a stone and an eraser between her hands. The chapter would expect her to find that
- A. Both compress equally
- B. The stone is hard to compress and the eraser compresses easily
- C. The stone compresses easily and the eraser is hard to compress
- D. Both become transparent
Q7. In Table 6.3, which of these objects is most likely to be entered as 'soft' and made of wool or yarn?
- A. Brick
- B. Tumbler
- C. Sweater
- D. Table
Q8. The chapter asks whether Sheeta's brother could see her and her friends through a closed wooden window of his house. The correct answer and reason are
- A. Yes, because wood is transparent
- B. No, because wood is lustrous
- C. Yes, because wood is translucent
- D. No, because wood is opaque
Q9. Materials through which objects can be seen but not clearly are called
- A. Transparent
- B. Opaque
- C. Translucent
- D. Lustrous
Q10. Ghulan's mother prepares shikanji using sugar, salt and lemon juice in water. Which of these is INSOLUBLE in water?
- A. Sugar
- B. Salt
- C. Lemon juice (the liquid)
- D. None of these — all dissolve in water
Q11. Some materials do not mix with water and do not disappear even after we stir them for a long time. These materials are said to be
- A. Soluble in water
- B. Lustrous in water
- C. Insoluble in water
- D. Translucent in water
Q12. In Activity 6.8, three paper cups A (water), B (sand) and C (pebbles) are weighed on a balance. The chapter says the balance reading directly measures
- A. Volume of the cup
- B. Mass of the contents
- C. Lustre of the contents
- D. Solubility of the contents
Q13. The chapter notes that in common language, 'weight' is sometimes used for mass. The reason given is
- A. Mass and weight are the same property in science
- B. Weight has no scientific meaning
- C. Mass is measured in litres
- D. Mass is determined by weighing, so the everyday term is used loosely
Q14. A student says, 'I could not transfer all the water from the jug into the empty water bottle.' The chapter's explanation is that
- A. The bottle was lustrous
- B. The water became insoluble
- C. The volume of water in the jug was more than the volume of the bottle
- D. The mass of the bottle increased
Q15. A drinking water bottle is labelled '500 mL'. Going by the chapter, this label indicates the
- A. Mass of the bottle in grams
- B. Hardness of the bottle
- C. Lustre of the bottle
- D. Volume of water in the bottle
Q16. In Ayurveda's twenty guṇa, the pair guru and laghu describes which everyday property of matter?
- A. Shine and dullness
- B. Soluble and insoluble
- C. Transparent and opaque
- D. Heavy and light in weight
Q17. Match the Ayurvedic pair to the modern chapter property: 'mṛdu × kaṭhina'.
- A. Lustrous and non-lustrous
- B. Soluble and insoluble
- C. Transparent and opaque
- D. Soft and hard
Q18. A Class 6 student in Lucknow says, 'Anything shiny must be a metal.' Which of these is the BEST teacher response to address this misconception?
- A. Tell the student she is wrong and move on
- B. Ask the student to memorise the list of metals from the textbook
- C. Skip the topic and revise it next year
- D. Show a shiny plastic-coated card and a dull, freshly-cut iron piece, and ask her to compare
Q19. Activity 6.7 asks students to first predict, then stir, then observe whether materials dissolve in water. What is the BEST pedagogical reason for keeping the 'predict' step before stirring?
- A. It makes students stir faster
- B. It makes the observation easier to record on a single line
- C. It surfaces the student's prior idea, so observation either confirms or revises it
- D. It is the only correct order in the syllabus
Q20. Madam Vidya wants Class 6 students to discover for themselves which materials are hard and which are soft. The most chapter-aligned activity is to
- A. Show a textbook list of hard and soft materials
- B. Have students copy Table 6.3 from a friend
- C. Ask students to memorise the Ayurvedic guṇa pairs first
- D. Ask students to scratch wood, aluminium, stone, candle and chalk with a metal key and compare
Q21. Ravi argues, 'Air is not matter because we cannot see it.' Which response BEST corrects his idea using chapter logic?
- A. Agree with Ravi, since we trust only what we see
- B. Ask Ravi to copy the definition of matter ten times
- C. Tell Ravi this will be covered only in Class 9
- D. Show that air occupies space (fills a balloon) and has mass (a balloon weighs more when inflated), so it fits the definition of matter
Q22. Mark the True/False status of each statement and pick the option that matches the chapter: I. Wood is translucent while glass is opaque. II. Aluminium foil has lustre while an eraser does not. III. Sugar dissolves in water whereas sawdust does not.
- A. I — False, II — True, III — True
- B. I — True, II — False, III — True
- C. I — True, II — True, III — False
- D. I — False, II — False, III — False
Q23. Which of the following best summarises the link between mass, volume and matter as stated in the chapter?
- A. Only mass defines matter; volume is optional
- B. Only volume defines matter; mass is optional
- C. A substance is matter only if it has lustre and mass
- D. Anything that occupies space (has volume) and has mass is called matter
Q24. The chapter draws a parallel between this chapter and 'Diversity in the Living World'. The shared big idea is that
- A. Both worlds use only colour for grouping
- B. Only non-living things have mass
- C. Only living things can be classified
- D. Both the living and the non-living world can be classified on the basis of properties
Q25. The SI unit of volume mentioned in the 'Do you know?' box is the cubic metre. The relation given is
- A. 1 m³ = 10 L
- B. 1 m³ = 100 L
- C. 1 m³ = 1000 L
- D. 1 m³ = 10000 L
Q26. Of the chapter, mass best quantifies
- A. How shiny a substance looks
- B. Whether a substance dissolves in water
- C. Whether a substance is transparent
- D. The amount of matter present in an object
Q27. A door curtain made of thick cotton blocks all view of the next room. Going by the chapter's definitions, the curtain material is
- A. Transparent
- B. Translucent
- C. Opaque
- D. Lustrous
Q28. The chapter asks students to visit a chemist shop and see how medicines are arranged. The arrangement most likely groups medicines on the basis of
- A. The colour of the strip alone
- B. The lustre of the wrapper
- C. A common property such as the kind of medicine or its therapeutic use
- D. The hardness of the tablet
Q29. Ghulan tells Sheeta, 'Look, I have a new notebook.' Sheeta replies, 'I also have a new notebook and a pen.' The chapter uses this dialogue to draw attention to
- A. Differences in school timings
- B. The volume of the school bag
- C. The lustre of the school uniform
- D. The everyday objects students use, made of various materials
Q30. The 'Learning further' box suggests collecting information on materials that can be recycled. According to the chapter, recyclers DO NOT buy objects mainly because they
- A. Look colourful
- B. Are difficult to recycle due to the properties of their material
- C. Are heavy
- D. Are made in India

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