NCERT Solutions for Class 6 Science Chapter 4 - Sorting Materials into Groups

Five objects that can be made from wood are: 

(i) Table

(ii) Chair

(iii) Bed

(iv) Door

(v) Bullock cart

Glass bowl and steel spoon

Objects	Materials
Book	Paper
Tumbler	Glass, plastic
Chair	Wood, plastic
Toy	Wood, paper, plastic
Shoes	Leather

(i) Stone is transparent, while glass is opaque. (False)

Reason: An object which allows light to pass through it completely is called transparent ex. glass. An object that does not allow light to pass through it is called opaque ex. stone.

(ii) A notebook has lustre, while an eraser does not. (False)

Reason: Both note book and eraser do not have lustre, they are non-lustrous.

(iii) Chalk dissolves in water. (False)

Reason: Chalk is insoluble in water.

(iv) A piece of wood floats on water. (True)

Reason: Wood is less dense than water and has air spaces in it so it floats on water.

(v) Sugar does not dissolve in water. (False)

Reason: Sugar is soluble in water.

(vi) Oil mixes with water. (False)

Reason: Oil is immiscible in water.

(vii) Sand settles down in water. (True)

Reason: Sand is heavier than water so it settles down.

(viii) Vinegar dissolves in water. (True)

(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

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.

(a) Baby

Reason: Baby is a living being whereas others are non-living objects.

(b) Boat

Reason: Boat is made from wood whereas the other three are flowers.

(c) Sand

Reason: Sand is not a metal whereas other three are metals.

(d) Sand

Reason: Sand is insoluble in water whereas the other three are soluble in water.