Hard

Materials Around Us — Hard

15 questions 18 min PYQ-grade reasoning

Q1. Consider these statements about why shops often store goods in transparent containers: I. The shopkeeper can see the contents without opening the container. II. The customer can identify the material inside before buying. III. Transparent containers always weigh less than opaque ones. Which are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q2. Air is all around us but does not hinder us from seeing each other. A wooden door in between, however, blocks our view. Choose the correct pair to complete: air is _____ and the wooden door is _____ .
- A. transparent, opaque
- B. translucent, transparent
- C. opaque, translucent
- D. transparent, translucent
Q3. Asha has two materials X and Y. X feels rigid and does not change shape when pressed; on mixing in water it dissolves completely. Y changes shape easily when pressed and remains unchanged in water. The best identification is
- A. X is soft and soluble; Y is hard and insoluble
- B. X is hard and soluble; Y is soft and insoluble
- C. X is hard and insoluble; Y is soft and soluble
- D. Both X and Y are soft and soluble
Q4. A material says, 'I have lustre.' Which one of the following best fits this single clue, going by chapter examples?
- A. Wood
- B. Rubber
- C. Aluminium foil
- D. Frosted glass
Q5. The statement 'An apple is matter because it occupies no space and has mass' is false. The correct version is
- A. An apple is matter because it occupies space and has mass
- B. An apple is not matter because it has neither mass nor volume
- C. An apple is matter only when cut into pieces
- D. An apple is matter because it has only mass, not volume
Q6. Read the statements about mixing liquids in water (based on the chapter): I. Vinegar mixes completely with water. II. Mustard oil mixes completely with water and forms one clear layer. III. Honey mixes completely with water on stirring. Which are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q7. Assertion (A): Fishes can live in water for their entire life. Reason (R): Oxygen gas dissolves in water. Choose the correct option
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q8. Assertion (A): Air is matter. Reason (R): Air occupies space and has mass. Choose the correct option
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q9. Ravi rubs a metal key on (i) chalk (ii) iron nail (iii) aluminium piece (iv) candle. Based on Activity 6.5, the key would NOT leave a clear scratch on
- A. Chalk
- B. Iron nail
- C. Aluminium piece
- D. Candle
Q10. For storing (i) food waste, (ii) broken glass and (iii) wastepaper, the chapter asks which material to choose for each container. Match each waste with one suitable property
- A. Food waste — hard and not soluble in water; broken glass — hard and rigid; wastepaper — light and dry-keeping
- B. Food waste — transparent only; broken glass — soft; wastepaper — soluble
- C. Food waste — lustrous; broken glass — translucent; wastepaper — heavy
- D. All three need the same flexible cloth container
Q11. Madam Vidya places bags on the seats, so students cannot sit. She uses this everyday observation to argue that
- A. Bags are matter because they are coloured
- B. Bags occupy space, just like all matter has volume
- C. Bags have lustre, like all matter
- D. Bags dissolve in students, so they are soluble
Q12. According to the SI-unit note in the chapter, the mass 'seven kilograms' is written correctly as
- A. 7 Kg
- B. 7 kgs
- C. 7 kg
- D. 7kg.
Q13. From the list — vinegar, honey, mustard oil, water, glucose, wheat flour — pick one pair where one material is soluble in the other
- A. Mustard oil and water
- B. Wheat flour and water
- C. Glucose and water
- D. Mustard oil and wheat flour
Q14. Statements about metallic lustre from the chapter: I. Some metals lose their lustre due to the effect of air and moisture. II. We often notice the lustre only on freshly cut surfaces of such metals. III. Once a metal becomes dull, it can never be a metal again. Which are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q15. A school in Ranchi wants chairs that 'do not bend on sitting after long use, can be cleaned regularly, and feel warm in winter'. According to the chapter, which one material best fits all three?
- A. Bamboo
- B. Cement
- C. Stone
- D. Cloth

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