INTERNATION INDIAN SCHOOL, AL- JUBAIL
Class: VI Subject: Science November 2023
Ch # 5 Sorting Materials Into Groups
I. Define:
1. Sorting out materials: The systematic arrangement of things on the basis of
certain similarities and differences is called sorting the materials.
2. Materials: A material is a substance which is used for making things. They
occupy space and have mass.
II. Give Reason:
a) When blue ink is dropped in water, the water turns blue.
Ans: Water and ink are soluble liquids. When ink is dropped in water, the ink
mixes with water and turns the water into blue.
b) A leaf floats in water while a stone sink.
Ans: Leaf has less density hence it floats in water; stone has high density hence
it sinks.
c) Iron nails lose their luster after keeping for some days. Give reason.
Ans: Iron nails lose their lustre and appear dull because of the action of air and
moisture on them.
d) We keep our money and valuables in a metallic or wooden almirah and not in a
glass cupboard.
Ans: Metallic or wooden almirahs are opaque so no one can see what is kept
inside it. Glass is transparent so everyone can see what is kept inside the glass
cupboard, which is not safe.
III. Answer the following:
1. Name some group of materials.
Materials can be grouped with objects made of
i. Wood
ii. Fibre
iii. Plastic
iv. Glass
v. Ceramic
vi. Rubber
vii. Metal
2. What is the need for sorting materials into different groups?
Importance of sorting materials:
i. Sorting helps in the systematic study of objects.
ii. Sorting helps in identifying and locating things.
iii. It helps to study the properties of objects of one kind
iv. It helps to understand similarities and dissimilarities among objects.
3. Why is a tumbler not made with a piece of cloth?
Ans: This is because we generally use a tumbler to keep or hold a liquid. A
tumbler made of a piece of cloth cannot hold water and hence cannot be
used to keep water. So, a tumbler is made with a material which has the
property to hold the liquid.
4. What are soft materials?
Ans:Materials which can be compressed or scratched easily are called soft
materials.
5. What are hard materials?
Ans:Materials which cannot be compressed or scratched easily are called
hard materials.
6. Differentiate between soluble and insoluble substances.
SOLUBLE SUBSTANCE INSOLUBLE SUBSTANCE
Substance which dissolves in Substance which does not dissolve
water is called soluble substance. in water is called insoluble
Eg: sugar, salt substance. Eg: chalk powder,
sawdust
7. Why do you think oxygen dissolved in water is important for the
survival of aquatic animals and plants?
Ans: Oxygen gas is soluble in water. The plants and animals which live
in water use the oxygen dissolved in water for respiration. Hence the
oxygen dissolved in water is important for the survival of aquatic
animals and plants.
8. Arrange the following in their increasing degree of hardness.
Iron, wood, candle wax.
Ans: Candle wax < woo d< iron
9. List five items known to you that float on water.
Ans: Wood, dry leaves, cork, oil, wax
10. Select those objects from the following which shine.
Glass bowl, plastic toy, steel spoon, cotton shirt
Ans: Steel spoon, glass bowl.
11. Name five objects which can be made from wood.
Ans: Cupboard, table, chair, door, Pen holder.
IV. ASSERTION AND REASON:
Options:
a) Both A and R is true and R is the correct explanation of the
assertion.
b) Both A and R is true but R is not the correct explanation of the
assertion.
c) A is true but R is false.
d) A is false but R is true
1. Assertion: Sugar forms a separate layer when mixed with water.
Reason : Liquids that get completely mixed with each other are
called soluble liquids. Option d.
2. Assertion: Materials which can be compressed or scratched easily are
called soft materials.
Reason : Iron is a hard material. Option b.
3. Assertion: Shopkeepers usually keep biscuits, sweets etc. in transparent
containers of glass or plastic.
Reason : Buyers could see through the transparent containers.
Option a.
Prepared by:
Dr.Ruth Mangani. I
