Chapter 06 Materials Around Us Solutions

Chapter 06 Materials Around Us Text Book Solutions

Let us play

Q1: Find the companion.
Link the following words by putting arrows between words that have a connection.

Ans:

• 
  Iron → Lustrous
  
• 
  Transparent → Glass
  
• 
  Copper → Lustrous
  
• 
  Solid → Wood
  
• 
  Bottle → Plastic
  
• 
  Opaque → Wood
  

Let us enhance our learning

Q1: Visit your kitchen and observe how your parents have organised various edibles. Can you suggest a better sorting method? Write it in your notebook.
Ans: Observe how items like spices, grains, and snacks are stored. Suggest organizing them based on usage frequency, type, or storage requirements (e.g., airtight containers for snacks).

Q2: Unscramble the letters (Column I) and match with their properties (Column II).

Ans: 

Q3: The containers which are used to store materials in shops and at home are usually transparent. Give your reasons for this.
Ans: Transparent containers allow you to see the contents without opening them, making it easier to identify and locate items quickly.

Q4: State whether the statements given below are True [T] or False [F]. Correct the False statement(s).
Ans: 
(i) Wood is translucent while glass is opaque. [False]
Correction: Wood is opaque while glass is transparent.
(ii) Aluminium foil has lustre while an eraser does not. [True]
(iii) Sugar dissolves in water whereas sawdust does not. [True]
(iv) An apple is a matter because it occupies no space and has mass. [False]
Correction: An apple is a matter because it occupies space and has mass.

Q5: We see chairs made up of various materials, such as wood, iron, plastic, bamboo, cement and stones. Following are some desirable properties of materials which can be used to make chairs. Which materials used to make chairs fulfil these properties the most?
Ans: 
(i) Hardness (does not bend or shake on sitting even after long use): Iron, Cement
(ii) Lightweight (easy to lift or to take from one place to another): Plastic, Bamboo
(iii) Does not feel very cold when sitting during winters: Wood, Plastic
(iv) Can be cleaned regularly and made to look new even after long use: Plastic, Iron

Q6: You need to have containers for the collection of (i) food waste, (ii) broken glass, and (iii) wastepaper. Which materials will you choose for containers of these types of waste? What properties of materials do you need to think of?
Ans: 
(i) Food waste: Plastic or metal containers, properties to consider are durability, non-reactivity, and ease of cleaning.
(ii) Broken glass: Metal or thick plastic containers, properties to consider are strength and resistance to breakage.
(iii) Wastepaper: Cardboard or plastic containers, properties to consider are lightweight and ease of handling.

Q7: Air is all around us but does not hinder us from seeing each other. Whereas, if a wooden door comes in between, we cannot see each other. It is because air is ____ and the wooden door is ____. Choose the most appropriate option:
Ans: (i) transparent, opaque

Q8: Imagine you have two mysterious materials, X and Y. When you try to press material X, it feels rigid and does not change its shape easily. On the other hand, material Y easily changes its shape when you press it. Now, when you mix both materials in water, only material X dissolves completely, while material Y remains unchanged. What can materials X and Y be? Can you identify whether material X is hard or soft? What about material Y? Justify your answer.
Ans: Material X is likely to be a soluble, hard substance like sugar or salt. Material Y is likely to be an insoluble, soft substance like clay or rubber.

Q9: (i) Who am I? Identify me on the basis of the given properties.
Ans: 
(a) I have lustre. → Metal
(b) I can be easily compressed. →Sponge
(c) I am hard and soluble in water. → Salt
(d) You cannot see clearly through me. → Opaque material like wood
(e) I have mass and volume but you cannot see me. → Air

(ii) Make your own ‘Who am I?’
Ans: 
(a) I am soft and insoluble in water. → Clay
(b) I am hard and have a shiny surface. → Metal 
(c) I can be easily compressed and I am used for cleaning. → Sponge

Q10: You are provided with the following materials—vinegar, honey, mustard oil, water, glucose and wheat flour. Make any two pairs of materials where one material is soluble in the other. Now, make two pairs of materials where one material remains insoluble in the other material.
Ans: 
Soluble pairs:

• 
  Vinegar and water
  
• 
  Glucose and water
  

Insoluble pairs:

• 
  Mustard oil and water
  
• 
  Wheat flour and water