Every day we see different things in our surroundings, and everything is of some material. We identify materials because each material varies in various aspects.
The classification of materials depending on their properties
Appearance
Every material looks different from one another. For example, the paper looks different from a pencil, iron looks different from copper, and so on. But although some materials look different, they might have some similarities.
Hardness
The materials which we cannot compress with our hands are called hard materials. These include stone, table, and many more.
The materials which we can press with our hands are soft. Examples are cotton, sponges.
We can easily differentiate materials based on their hardness by touching them.
Transparency
Some materials are transparent, which means the other side is visible through these materials. Examples are glass, water, and air.
Separation of materials
Some situations insist on the separation of materials from one another.
Handpicking
We can separate large materials with this method. Examples are rice and pulses.
Threshing
The separation of grains from stalks is called threshing.
Winnowing
In this method, the lighter and heavier particles of a mixture separate by blowing air.
Sieving
In sieving, the flour is allowed to pass through the sieve leaving behind the impurities.
Sedimentation
In this method, when water is substituted the mixture, and the heavier component settle down.
Evaporation
The transformation of water into its vapor is called evaporation.
Sorting and Separation of Materials Sample Questions for Class 6
Question 1
Which reason is incorrect for separating components of a mixture?
A. To separate two or more different but useful components
B. To remove undesirable and useless components
C. To remove pure or harmless components
D. To obtain pure sample of a substance
Question 2
A machine which is used for harvesting, threshing as well as for separting the grains from straw is called
A. Harvester
B. Thresher
C. Sieve
D. Ladle
Question 3
Tea leaves are removed from the brew by
A. Hand picking
B. Strainer
C. Aquaguard filter
D. Thresher
Question 4
Sorting and Separation of Materials into Groups Worksheet-1
Sorting and Separation of Materials into Groups Worksheet-1
Which is the correct list of characteristics of metals?
A. Shine brightly when polished; good conductors of electricity and heat; solid at room temperature; transparent
B. Good conductors of electricity and heat; solid at room temperature; opaque, except in extremely thin films; do not shine at all when polished
C. Bad conductors of electricity and heat; solid at room temperature; opaque, except in extremely thin films
D. Shine brightly when polished; good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films.
Question 5
When no more salt can be dissolved in water at a particular temperature then the solution a that temperature is called
A. Unsaturated
B. Saturated
C. Sometimes saturated sometimes unsaturated
D. None of these