NCERT Solutions for Class 6th Science: Chapter 4: Sorting Materials Into Groups
Question 1:
Classify the following fibres as natural or synthetic: Nylon, wool, cotton, silk, polyester, jute
Answer:
Fibres that are obtained from nature, i.e., from plants and animals are called natural fibres and those made by humans by chemical methods are known as synthetic fibres. Wool and silk are obtained from animals and cotton and jute are obtained from plants. Hence, they are natural fibres. Nylon and polyester on the other hand are prepared artificially and are therefore synthetic fibres.
Question 2:
Select those objects from the following which shine: Glass bowl, plastic toy, steel spoon, cotton shirt
Answer:
Glass bowl and steel spoon
Question 3:
Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects.
| Object |
Material |
| Book |
Glass |
| Tumbler |
Wood |
| Chair |
Paper |
| Toy |
Leather |
| Shoes |
Plastics |
Answer:
| Object |
Material |
| Book |
Paper |
| Tumbler |
Glass, plastic |
| Chair |
Wood, plastic |
| Toy |
Wood, paper, plastic |
| Shoes |
Leather |
Question 4:
State whether the statements given below are ‘True’ or ‘False’.
(i) Stone is transparent, while glass is opaque.
(ii) A notebook has lustre, while an eraser does not.
(iii) Chalk dissolves in water.
(iv) A piece of wood floats on water.
(v) Sugar does not dissolve in water.
(vi) Oil mixes with water.
(vii) Sand settles down in water.
(viii) Vinegar dissolves in water.
Answer:
(i) Stone is transparent, while glass is opaque. (False)
(ii) A notebook has lustre, while an eraser does not. (False)
(iii) Chalk dissolves in water. (False)
(iv) A piece of wood floats on water. (True)
(v) Sugar does not dissolve in water. (False)
(vi) Oil mixes with water. (False)
(vii) Sand settles down in water. (True)
(viii) Vinegar dissolves in water. (True)
Question 5:
Given below are the names of some objects and materials: Water, basket ball, orange, sugar, globe, apple, and earthen pitcher
Group them as:
(a) Round shaped and other shapes
(b) Eatables and non-eatables
Answer:
(a) Round-shaped: Basketball, orange, globe, apple, earthen pitcher Other shapes: Water, sugar
(b) Eatables: Water, orange, sugar, apple Non-eatables: Basketball, globe, earthen pitcher
Question 6:
List all items known to you that float on water. Check and see if they will float on oil or
kerosene.
Answer:
Some items that float on water are listed below:
1. Plastic bottle
2. Piece of paper
3. Piece of sponge
4. Piece of thermocol
5. Wood
6. Bamboo
7. Plastic ball
8. Cork
However, none of these items floats on oil or kerosene.
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