Home » class 6 science » NCERT Solution Class 6 Science Chapter – 4 Sorting Materials into Groups

NCERT Solution Class 6 Science Chapter – 4 Sorting Materials into Groups

Question 1: Name 4 objects that are made from wood.
(I) Desk   (ii)  windows     (iii) hammerhandles       (IV) cardboard

Question 2: Which of the following objects shine?
Glass bowl
Plastic toy
Steel spoon
Cotton shirt
Answer:  Shining objects are steel spoon and glass bowl

Question 3:Match the following objects with the materials that they are made up off.

Objects Materials
Book Glass
Cups Wood
Chair Paper
Toy Leather
Shoes Plastics


Objects Materials
Book Paper
Cups Glass
Chair Wood
Toy Plastics
Shoes Leather

Question 4: Answer whether the statements given below are ‘Right or ‘Wrong’.
(1) Stone is opaque, while glass transparent.
(2) A notebook has luster while eraser does not have luster
(3) Chalk does notdissolves in water.
(4) In water wood floats.
(5) In water sugar does notdissolves.
(6) Water mixes with oil.
(7) Sand floats in water.
(8) Vinegar can be dissolved in water.
(1) Right   (2) Wrong    (3) Right (4) Right  (5) Wrong  (6) Wrong   (7) Wrong   (8) Right

Question 5:Categorize the following according to the question:
Cricket ball
Earthen pitcher
(a) Eatables and non-eatables
(b) Round shaped and other shapes
(a) (i) Round shaped: 
cricket ball, football,
(ii) Other shapes:  Sugar, water.
(b) (i) Eatables:  Apple ,water, sugarand orange
(ii) Non-eatables:  Basketball, football, globe and earthen pitcher.

Question6:  Mention all the objects that float on water. Mention the objects that can also float on kerosene oron oil.
(A) Objects on the list that float on water
(3) Sheet of plastics
(4) Ice
(5) Wax
(6) Oil
(B) Objects in the list that float on an oil:
(1)Plastic sheet
(2) Paper
(3) Wax in the candle
(4) Wood
(5) Thermopolis
(C) Objects in the list that float on kerosene:
(1) Thermopolis
(2) Paper
(3) Thin plastic sheet

Question 7: In the given following, find the odd one out:
(1) Key, spoon, Table, child, Cupboard
(2) Rose, Jasmine, Ball, Marigold, Lotus
(3) Aluminum, Iron, Copper, Silver, sun
(4) Stone, Salt, Sand, ammonium sulphate
(1) Child (expect this all others are non-living)
(2) Ball (expect this all others are flowers)
(3) Sun (expect this all others are metals)
(4) Stone (expect this all others are soluble in water)



Q1:  Why do we require to group materials? Give one reason.
Answer:  It helps to describe their properties when we group materials for our convenience

Q2:Mention any two categories in which the objects can be grouped.

Answer: (1)  Wood or metal/plastic are material used in making the object.
(2)  Material of the object is soft or hard, or substance is soluble or insoluble in water.

Q3:When a substance is compressed maybe soft or hard?
Answer: Substance iscompressed itis soft.

Q4: Give an example of a lustrous material.
Answer: Aluminum.

Q5:Toysare made up of what material?
Answer:  Metal or Plastics.

Q6:Is oil soluble in water?
Answer:  It is insoluble because water is polar and oil is nonpolar, their molecules are not attracted to each other. The polar solvent molecules like water are attracted to other polar molecules for sugar,

Q7:What objects are made of opaque materials?
Answer:  Blackboard/steel plate, wooden doors,.

Q8: What is the common difference betweenthe state of sand and salt?
Answer: They are in solid state and have mass.

Q9:Mention anythree liquidsthat they are transparent.
Answer:  Water, alcohol and Acetone/Benzene.

Q10:Mention any two materials made from leather.
Answer:  Shoes and Belt.

Q11:Mention any objects or materials made from plastics.
Answer: Toys, cups, laptop, computer parts

Q12:If we compare iron and sponge which is harder?
Answer:  Iron is harder

Q13: Mention any two gases, which are soluble in water.
Answer:  Carbon di-oxide, oxygen

Q14:Mention any2 gases which are insoluble in water.
Answer: Nitrogen and Hydrogen


Question1: Explain some properties of the materials.
(a) Material transparency
(b) Hardness (thickness)
(c) Floatation or submersible in water
(d) Solubility
(e) Appearance

Question2: Why cups made of cloth and not paper?
Answer:  Generally, we use cups, whichare made by glass, plastic and metal, which contain liquid. Cups, which are made by cloth, cannot hold a liquid due to the following reasons:
(i) Cloth piece is very light to hold liquids
(ii) Cloth piece contain micro pores through which the liquid oozes out.

Question 3: Mention the similarities between copper, iron and aluminum.
(a) All of them contain luster,
(b) All are metals,
(c) They are very hard.

Question 4: Name some materials, whichare made by paper.
Paper cups,
Paper bags,
Calendars, etc.

Question 5: Universal solvent (water) is very essential for the human body. Why?
Answer: The universal solvent can able to dissolve number of substances .so it is essential for the human body. It constitutes major part of cells located in human body.

Question 6: State the reason for the grouping materials.
Answer:  It helps to describe their properties when we group materials for our convenience

Question 6: State the reason for the grouping materials.
Answer: It helps to describe their properties when we group materials for our convenience

No Materials Objects made of these materials
1 Iron Tables,doors,bathroom fitting, mesh
2 wood Plough, bullock cart and its wheels
3 Leather Shoes, belt
4 cotton Bed ,pillow ,dress
5 plastics Chairs, buckets
6 paper Books, note books, toys

Question 9: Create a table and Find whether the following materials mix with Vinegar. Water, Mustard oil, Lemon juice,Kerosene,Coconut oil.

Sl.no Liquid Mixes well/Does not mix
1 Kerosene Does not mix
2 Coconut oil Does not mix
3 Mustard oil Does not mix
4 Lemon juice Mixes well
5 Vinegar Mixes well

Question 10: Luster (shine) is the property of metal. Certain metal articles become dull and lose their shine why? Give reason.
Answer:  Metals react with moisture when exposed to air and gases present in it, hence the forming dull layer of other compounds in it.

Question 11: Coconut oil,Kerosene, mustard will not dissolve in water even if it was mixed with agitation. Forming two different layers, they separate after sometime. Explain why
Answer:  The molecules of oil do not mix with the molecules of water. Oil cannottake the space between water molecules therefore, they are immiscible.

Question 12: Suggest a non-metal that has luster.
Answer:  Iodine

Question 13:  In solid state metal occurs generally and they are hard. Mention a metal, which exits in state of liquid, and a metal, which was soft and could be cut with the knife.
Answer:  Metal is mercury which is state of liquid .Potassium and sodium can be cut with the knife because they are soft

Question 14: Mention the hardest substance that occurs naturally that you know.
Answer:  The substance is diamond, fully formed by carbon

Question 15: Why is universal solvent water?
Answer:  A large number of substancesdissolve in water. Hence, it is termed as universal solvent.


Question 1: “Grouping of objects helps the shopkeeper,” Describe the statement.
Answer:  Shopkeeper feels easy by proper grouping of objects following ways:
(i) The object can be easily and quickly located.
(ii) He will easily identify the goods that are going to be sold out and he can buy easily for his customers

Question 2: Water is transparent describe a process to prove it.
Answer:   Clean water is partially filled in a beaker. In beaker of water put a coin. The beaker should be kept aside undisturbed for some time in the presence of light. Now, see the water from the top of the beaker in which coin was immersed. I think you will see the coin clearly.Yes, the coin immersed in water can be seen very clearly. This proves transparent liquid is water.

Question 3:  ‘Our palm is translucent’, write an experiment to show that.
Answer:  When your palm covers the glass of a torch switching on the light. It can be observed that the light of torch passes through palm but not clearly. This shows that when a strong beam of light passes our palm therefore our palm is translucent.

Question 4:  How can you show that solids like chalk powder and sand are not soluble in water? Some solids like sugar, salt are soluble in water. Give reason
Answer:  Gather some amount of salt, sugar, sand and chalk power.Ready with 4 beakers. About two-third with water was filled in each one of them. Teaspoonful of sugar was added to the first beaker, salt to the 2nd, in the third chalk powder and at the fourth beaker sand was filled. Each beaker with content can be stirred with the spoon/stirrer.
After some time, we can easily observe what happens to the substances added to the water. Write down your observations in the following.
(i) Chalk powder and sand are insoluble in water
(ii) Sugar and salt are soluble in water.


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