NCERT Solutions Std 6 Science Sorting Materials into Groups

       Sorting Materials into Groups

 

Exercise:
1). Name five objects which can be made from wood.
     Chair, table, plough, bullock cart and bed.

2). Select those objects from the following which shine
Glass bowl, plastic toy, steel spoon, cotton shirt.
      Glass bowl and steel spoon are the objects that shine.

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.

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

 

Answers:

Objects Materials
Book paper
Tumbler Plastic, glass
Chair Wood, plastic
Toy plastic
Shoes leather

4). State whether the statements given below are True or False.

(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 the water.
True.

(viii) Vinegar dissolves in water.
True.

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

Round shaped Other shapes
Basket ball

Orange

Globe

Apple

Earthen pitcher

Water

Sugar

 

(b) Eatables and non-eatables

Eatables Non-eatables
water

Orange

sugar

apple

Basket ball

globe

Earthen pitcher

 

6). List all items known to you that float on water. Check and see if they will float on an oil or kerosene.
     Items that float on water are paper, wood, wax, ice and oil etc.
Items that float on oil are paper, wax and wood.
Items that float on kerosene are paper.

7). Find the odd one out from the following:

a) Chair, Bed, Table, Baby, Cupboard

b) Rose, Jasmine, Boat, Marigold, Lotus

c) Aluminium, Iron, Copper, Silver, Sand

d) Sugar, Salt, Sand, Copper sulphate

Answer:
a) Chair, Bed, Table, Baby, Cupboard
baby.

b) Rose, Jasmine, Boat, Marigold, Lotus
boat

c) Aluminium, Iron, Copper, Silver, Sand
sand

d) Sugar, Salt, Sand, Copper sulphate
sand.

Additional questions:
State whether True or False.

1). All these objects have different shapes, colours and uses.
True.

2). Objects around us are made of different materials.
True.

3). One material cannot be used for making many different objects.
False.

4). Liquids do not mix with water.
False.

5). Some gases are soluble in water.
True.

6). Salt disappears completely in water.
True.

Name the following
1). Two things made up of plastic.
Bucket, toys

2). Two things that made up of wood.
Table, chair

3). Two things that float on water.
Wood, paper

4). Two things that are transparent.

air and glass. 

5). Two things that are soluble in water.
Sugar, salt.

6). Two things that are made up of leather.
Bag, belt.

7). Two things that are made up of paper.
Books, calenders.

8). Two metals.
Iron and copper.

9). Two transparent materials.
Water and glass.

10). Two opaque substances.
Wood and metal

Fill in the blanks.
1). All objects around us are made of one or more materials.
2). Some gases are soluble in water.
3). Objects around us are made up of a large variety of materials.

Distinguish between soft and hard materials.

 

Soft material Hard materials
1. Materials that can be compressed or scratched easily are called as soft materials. 1. Materials that are difficult to compress or scratch are called as hard materials.
2. Examples: Cotton and sponge 2. Examples: iron

 

Distinguish between transparent and opaque.

transparent opaque
1. Materials through which things can be seen are called transparent. 1. Materials through which things cannot be seen are called opaque.
2. Examples: Glass and water. 2. Examples: wooden box and metal container.

Give reasons
1). Water plays an important role in the functioning of the body.
     Water plays an important role in the functioning of the body because it can dissolve a large number of substances.

2). Some metals often lose their shine and appear dull.
     Some metals often lose their shine and appear dull because of the action of air and moisture on them.

3). Shopkeepers usually keep eatables in glass containers.
     Shopkeepers usually keep eatables in glass containers so that buyers can easily see them.

Define:
1). Translucent
The materials through which objects can be seen but not clearly are known as translucent.

2). Opaque
Materials through which things cannot be seen are called opaque.

Why do we need to group materials?
     We group materials for our convenience. Dividing materials in groups makes it convenient to study their properties and also observe any patterns in their properties.

Classify the following as transparent and opaque.
Wood, glass, air, metal container, water, cardboard, iron box

 

transparent opaque
Glass

Air

water

Wood

Metal container

Cardboard

Iron box

 

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