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Q1. Which of these everyday samples is best described as a mixture in the sense used in this chapter?
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Q2. Exercise Q1 — What purpose does handpicking serve in the process of separation?
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Q3. After threshing on a wooden log, a heap of wheat grains is still found mixed with husk. The most suitable next step a traditional farmer takes is
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Q4. A modern threshing machine in a Punjab field works on bundles of harvested wheat. The 'More to know!' box notes that this machine performs
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Q5. Ravi has a mixture of cumin seeds and very fine dust. He blows gently from one side. The likely outcome is
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Q6. The chapter opens with Kabir's doha: 'साधु ऐसा चाहिए जैसा सूप सुभाय / सार सार को गहि रहै थोथा दई उडाय.' The 'soop' image here is a literary reference to which method of separation?
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Q7. Mami uses a sieve with hole size H to remove bran from wheat flour. If H is replaced by a much larger hole size H', the likely outcome is
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Q8. A worker pours a heap through a sieve. Smaller particles pass through the holes and larger particles remain on the sieve. Read three claims about this:
I. Sieving works because of a difference in particle size between the components.
II. Sieving will not work if both components have very nearly the same particle size.
III. The holes of a good sieve should all be of roughly uniform size for clean separation.
Which are correct?
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Q9. Seawater is kept in shallow pits, not deep tanks, to obtain salt. The shallow shape mainly helps because
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Q10. The 'More to do!' box prompts students to find Indian water bodies that yield common salt. The example named in the chapter is
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Q11. The 'Do you know?' box notes that Ayurvedic herbs and plant parts are often dried in the shade, not under direct sunlight. The shade-drying step relies on evaporation chiefly to
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Q12. In Activity 9.2, Ravi spreads a few drops of salt solution on a piece of black thick paper and lets it dry. After drying, white patches appear where the drops were. The white substance is mainly
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Q13. Dada leaves the saucepan of tea undisturbed for some time before pouring. The tea leaves settle at the bottom because they are
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Q14. Dada notes that even after careful decantation, a few tea leaves can still reach his mouth. This observation is best used to argue that
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Q15. A Class 6 teacher in a school near Indore plans to introduce winnowing through a hands-on cycle of Predict–Observe–Explain. Which sequence of steps is most consistent with this pedagogy?
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Q16. After settling, Dada pours the tea through a tea strainer to obtain a cleaner cup. The tea strainer's mesh works by
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Q17. The 'Do you know?' box on tea bags states that early tea bags were made from
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Q18. The chapter shows a lady in a Madhya Pradesh kitchen using a wooden tool to mix curd by rotating it briskly with a rope. This traditional tool is called a
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Q19. A homemaker in Pune uses an electric mixer to whip curd until butter floats on top. In terms of the chapter, the mixer performs the same role as which traditional method?
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Q20. Three small objects are mixed in a single pile: an iron pin, a small copper wire and a piece of plastic. Which can be removed from the pile by simply running a bar magnet over it?
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Q21. Read the assertion and reason.
Assertion (A): A magnet can pick up iron nails dropped in sawdust.
Reason (R): Iron is a magnetic substance, as students learnt in the chapter 'Exploring Magnets'.
Choose the correct option.
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Q22. Activity 9.6 places separation tasks in two baskets — 'remove the unwanted' and 'save the useful'. Which classification of the tasks below is correct?
I. Picking small stones out of rice → remove the unwanted
II. Getting cream from milk → save the useful
III. Picking marigold flowers from a heap → save the useful
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Q23. Mami prepares murmura chivda by mixing puffed rice and chana dal, and finds that some chana dal pieces are mixed with very fine spice dust she does not want. The most suitable single method to remove just the dust from this mix is
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Q24. A jar holds a mixture of dried red chillies, common salt and water. To recover each component, the chapter's reasoning suggests
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Q25. Exercise Q4 statement: 'A mixture of mustard oil and lemon water can be separated by decantation.' This statement is best judged as
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Q26. Exercise Q7 asks students to identify the role of nasal hair. Aligned with this chapter, nasal hair in the human nose acts as
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Q27. A vendor checks two sieves before buying. Sieve P has holes that are all of nearly the same size; sieve Q has holes that vary widely in size. For clean separation of flour from bran, sieve P is better because
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Q28. After sediments settle in a glass of pond water, Ravi tilts the glass very slowly and pours the upper clearer water into a clean cup. The slow tilting is important because
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Q29. A Class 6 teacher in Bhopal wants students to grasp that 'separation methods are not just school science but everyday science'. Which classroom strategy is the most effective?
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Q30. A Class 6 teacher finds that some students believe 'every separation method should remove the waste'. Which response is the most effective way to address this misconception?
