Class 6 Science Curiosity Chapter 6 Question Answer

Materials Around Us

Question 1. Visit your kitchen and observe how your parents have organised various edibles. Can you suggest a better sorting method? Write it in your notebook.

Answer: In my kitchen, the edibles are organized based on their type. For example, spices are kept in one drawer, pulses and grains in another, and snacks in a separate shelf. A better sorting method could involve categorizing based on frequency of use or expiry dates. Items used daily, like spices and oil, can be placed in easily accessible places, while items with longer shelf life, such as grains, can be stored in the back. Grouping foods with shorter expiry dates together would also help prevent food wastage.

Question 2. Unscramble the letters (Column I) and match with their properties (Column II).

Answer:

Question 3. The containers which are used to store materials in shops and at home are usually transparent. Give your reasons for this.

Answer: Containers are usually transparent to allow easy visibility of the contents inside. This helps in identifying items without opening the containers, making it more convenient to check the quantity and condition of the materials stored, especially in shops and kitchens.

Question 4. State whether the statements given below are True [T] or False [F]. Correct the False statement(s).

(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. [ ]
(iv) An apple is a matter because it occupies no space and has mass. [ ]

Answer:

(i) False

Corrected Statement: Wood is opaque while glass is transparent.

(ii) True

(iii) True

(iv) False

Corrected Statement: An apple is a matter because it occupies space and has mass.

Question 5. 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?

(i) Hardness (does not bend or shake on sitting even after long use).

Answer: Wood, Iron, Cement

(ii) Lightweight (easy to lift or to take from one place to another).

Answer: Plastic, Bamboo

(iii) Does not feel very cold when sitting during winters.

Answer: Wood and bamboo

(iv) Can be cleaned regularly and made to look new even after long use.

Answer: Plastic, Iron

Question 6. You need to have containers for 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?

Answer:

• Food waste: A plastic or metal container because it can be easily cleaned, is durable, and does not absorb moisture.
• Broken glass: A metal container because it is strong and resistant to breakage.
• Wastepaper: A lightweight plastic or cardboard container, as paper is light and does not need a heavy-duty container.

Question 7. 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:

(i) transparent, opaque
(ii) translucent, transparent
(iii) opaque, translucent
(iv) transparent, translucent

Answer: (i) transparent, opaque

Question 8. 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.

Answer:

• Material X could be sugar or salt because it is hard and soluble in water.
• Material Y could be rubber or plasticine because it is soft, easily moldable, and does not dissolve in water.

Material X is hard because it is rigid and does not change shape easily, while Material Y is soft because it can easily change its shape when pressed.

Question 9. (i) Who am I? Identify me on the basis of the given properties.

(a) I have lustre.                                                                           _ _ _ _ _ _ _ _
(b) I can be easily compressed.                                              _ _ _ _ _ _ _ _
(c) I am hard and soluble in water.                                      _ _ _ _ _ _ _ _
(d) You cannot see clearly through me.                              _ _ _ _ _ _ _ _
(e) I have mass and volume but you cannot see me.      _ _ _ _ _ _ _ _

Answer:

(a) e.g., Gold, Iron
(b) Sponge
(c) Salt
(d) Frosted Glass
(e) Air

(ii) Make your own ‘Who am I?’

Example:

(a) I am hard.
(b) I can be scratched with a key.
(c) I have lustre.

Answer: Iron

Question 10. 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.

Answer:

Soluble Pairs:

Vinegar + Water (Vinegar is soluble in water)
Glucose + Water (Glucose is soluble in water)

Insoluble Pairs:

Mustard oil + Water (Oil does not dissolve in water)
Wheat flour + Water (Wheat flour does not dissolve completely in water, forms a paste)

(Page 104)

Question. Would it be a good idea to use paper-like materials for making cooking utensils?

Answer: No, it would not be a good idea to use paper-like materials for making cooking utensils because paper is not heat-resistant, it burns easily, and it cannot hold liquids or withstand high temperatures necessary for cooking.

(Page 110)

Question. Is water transparent? Can it be made opaque?

Answer: Yes, water is transparent, meaning you can see through it clearly. However, water can be made opaque by mixing it with substances like mud or chalk powder, which do not dissolve and prevent light from passing through.

(Page 111)

Question. Does everything you put in water disappear?

Answer: No, not everything you put in water disappears. Some materials dissolve in water (like sugar and salt), while others (like sand or sawdust) do not dissolve and remain visible even after stirring.

(Page 115)

Question. Are there any properties which can be shown by all materials? If yes, what are those?

Answer: Yes, all materials share two common properties: they have mass (the amount of matter in them) and they occupy space (volume). These two properties are present in all materials and are used to define matter.