Materials Around Us Class 6 Question Answer Science Chapter 6

Materials Around Us Class 6 Questions and Answers NCERT Solutions

Class 6 Science Chapter 6 Materials Around Us Question Answer

Let Us Enhance Our Learning

Question 1.
Visit your kitchen and observe how your parents have organised various edibles. Can you suggest a better sorting method? Write it in your notebook.
Answer:
Do it yourself as a fun activity.

Question 2.
Unscramble the letters (Column I) and match with their properties (Column II).

Answer:
The correct table is shown below:

Column I	Column II
(i) MATTER	(a) Occupies space and has mass
(ii) SOLUBLE	(b) Mixes completely in water
(iii) TRANSPARENT	(c) Objects can be seen clearly through it
(iv) LUSTRE	(d) Shiny surface

Question 3.
The containers which are used to store materials in shops and at home are usually transparent. Give your reasons for this.
Answer:
The containers which are used to stere materials in shops and at home are usually transparent so that the items kept inside it can be easily seen and helps us to locate those items easily.

Question 4.
State whether the statements given below are True [T] or False [F]. Correct the False statement(s).
(i) Wood is translucent while glass is opaque. [ ]
Answer:
Wood is translucent while glass is opaque. [False]
Corrected statement: Wood is opaque while glass is transparent.

(ii) Aluminium foil has lustre while an eraser does not. [ ]
Answer:
Aluminium foil has lustre while an eraser does not. [True]

(iii) Sugar dissolves in water whereas sawdust does not. [ ]
Answer:
Sugar dissolves in water whereas sawdust does not. [True]

(iv) An apple is a matter because it occupies no space and has mass. [ ]
Answer:
An apple is a matter because it occupies no space and has mass. [False]
Corrected statement: An apple is a matter because it occupies space and has mass.

Question 5.
We see chairs made up of various materials, such as wood, iron, plastic, bamboo, cement and stones. Following are some desirable properties of materials which can be used to make chairs. Which materials used to make chairs fulfill these properties the most?
(i) Hardness (does not bend or shake on sitting even after long use).
(ii) Lightweight (easy to lift or to take from one place to another).
(iii) Does not feel very cold when sitting during winters.
(iv) Can be cleaned regularly and made to look new even after long use.
Answer:
(i) Wood, iron, cement and stones.
(ii) Plastic and bamboo.
(iii) Wood and bamboo.
(iv) Wood, iron and plastic.

Question 6.
You need to have containers for collection of (i) food waste, (ii) broken glass and (iii) wastepaper. Which materials will you choose for containers of these types of waste? What properties of materials do you need to think of?
Answer:
(i) Food waste: Plastic or metal containers as they are durable and easy to clean.
(ii) Broken glass: Metal or wooden containers as they are resistant to breakage.
(iii) Wastepaper: Plastic or cardboard containers as they are cheap and easy to carry.

Question 7.
Air is all around us but does not hinder us from seeing each other. Whereas, if a wooden door comes in between, we cannot see each other.
It is because air is ….. and the wooden door is …… Choose the most appropriate option:
(i) transparent, opaque
(ii) translucent, transparent
(iii) opaque, translucent
(iv) transparent, translucent
Answer:
(i) transparent, opaque

Question 8.
Imagine you have two mysterious materials, X and Y. When you try to press material X, it feels rigid and does not change its shape easily. On the other hand, material Y easily changes its shape when you press it. Now, when you mix both materials in water, only material X dissolves completely, while material Y remains unchanged. What can materials X and Y be? Can you identify whether material X is hard or soft? What about material Y ? Justify your answer.
Answer:
Material X can be salt, as it is hard and soluble in water. Material Y can be rubber, as it is soft and insoluble in water.
Material X is hard as it does not change its shape easily on pressing and feels rigid. Material Y is soft as it easily changes its shape when you press it.

Question 9.
(i) Who am I? Identify me on the basis of the given properties.
(a) I have lustre. ______
(b) I can be easily compressed. ______
(c) I am hard and soluble in water. ______
(d) You cannot see clearly through me. ______
(e) I have mass and volume but you cannot see me. ______
Answer:
(a) Copper wire (any metal)
(b) Sponge
(c) Salt
(d) Butter paper
(e) Air

(ii) Make your own ‘Who am I’?
Answer:
(ii) Who am I?
(a) You can see clearly through me.
(b) I am soft and insoluble in water.
(c) I am a liquid and I am insoluble in water.
(d) I am a gas and I am soluble in water.
(e) I am dull and do not have lustre.

Question 10.
You are provided with the following materials-vinegar, honey, mustard oil, water, glucose and wheat flour. Make any two pairs of materials where one material is soluble in the other. Now, make two pairs of materials where one material remains insoluble in the other material.
Answer:
Soluble pairs
(i) Vinegar and water
(ii) Glucose and water

Insoluble pairs
(i) Mustard oil and water
(ii) Wheat flour and water

NCERT Solutions for Class 6 Science Chapter 6 Materials Around Us

Intext Questions

Question 1.
Why cannot a tumbler made of cloth be used for storing water? (Page 104)
Answer:
The materials that are required to make a tumbler should be capable of holding water. We choose material to make an object based on its properties and the purpose for which the object is made. As cloth is not capable of holding water, we can’t make a tumbler of cloth.

Question 2.
Would it be a good idea to use paper-like materials for making cooking utensils? (Page 104)
Answer:
No, paper-like materials will not be a good idea to use for making cooking utensils as paper can catch fire easily while cooking thus, itris not safe.

Question 3.
Are all lustrous materials metals? (Page 107)
Answer:
No, just because an object shines, does not mean it is made up of metal. Some materials are made shiny by polishing or covering them with thin layers of plastic or wax or any other materials which can make an object shiny.

Question 4.
Is water transparent? Can it be made opaque? (Page 110)
Answer:
Yes, water is transparent as an object can be seen through a given sample of water. It can be made opaque by converting it into ice or adding some dirt or ink.

Question 5.
Does everything you put under water disappear? (Page 111)
Answer:
No, water dissolves a large number of materials, but not all of them. Materials which do not dissolve in water are insoluble in water. For example, sand, chalk, mustard oil, etc.

Question 6.
Do liquids like oil, vinegar and honey dissolve in water? (Page 112)
Answer:
Refer to text on page no. 84.

Question 7.
What about the gases present in water? (Page 112)
Answer:
Refer to text on page no. 84.

Question 8.
Are there any properties which can be shown by all materials? If yes, what are those? (Page 115)
Answer:
Yes, there are two properties, mass and volume which can be shown by all materials.

Question 9.
Is air matter? (Page 116)
Answer:
Yes, air is matter as it has mass and takes up space.

Let’s Investigate

Aсtіvity 1 (Page 107-108)

Aim : To observe whether different objects like, brick, water bottle, pillow, tumbler, table, sweater, etc. are hard or soft.
Materials Required Brick, water bottle, pillow, tumbler, table, sweater and metal key.

Procedure :

1.  Collect the given objects.
2. Compress these objects with your hands. Also try to scratch them with a metal key.
3. Separate the hard and soft objects.
4. Note down your ohservations in the table below. Also write down the materials with which they are made up of.

Observation

Object	Hard/Soft	Material (s)
Brick	Hard	Baked clay
Water bottle	Hard	Plastic
Pillow	Soft	Foam
Tumbler	Hard	Glass
Table	Hard	Wood
Sweater	Soft	Wool

Conclusion : Some of the given objects like, brick, water bottle, tumbler and table are hard objects while others are soft objects.

Viva Questions :
1. Name some soft objects other than objects mentioned in the above activity.
2. Does a chair feel hard or soft?

Activity 2 (Page 109-110)

Aim : To classify the objects as transparent, translucent and opaque.
Materials Required Glass tumbler, butter paper, eraser, frosted glass, wooden board and window glass.

Procedure :
1. Collect the given objects.
2. Try to look through them.
3. Note down the observations in the table below.

Observation :

Transparent	Translucent	Opaque
Glass tumbler	Butter paper	Eraser
Window glass	Frosted glass	Wooden board

Conclusion We notice that we can clearly see through some objects like, glass tumbler, window glass etc. So, these objects are transparent. Whereas, we can see but not clearly through some objects, like, butter paper and frosted paper, these are translucent objects. Lastly, we cannot see at all through some objects, like, wooden block, eraser, etc. Thus these are opaque objects.

Viva Questions :
1. Which material is used in making the display window of a clothing store?
2. How is frosted glass different from normal glass?

Activity 3 (Page 110-111)

Aim : To observe whether different solid materials (like sugar, salt, chalk powder, sand, sawdust) are soluble or insoluble in water.
Materials Required Beakers, spoon, water, sugar, salt, chalk powder, sand and sawdust.

Procedure :

1. Collect the samples of given solid materials.
2. Take 5 beakers. Fill each of them up to two third volume with water.
3. Add small amount of each material, in different beakers separately.
4. Stir the contents of each beaker with the help of spoon.
5. Note your observations in table given below.

Observation :

Solid Materials	Disappears
Salt	Disappears
Sugar	Does not disappear
Sand	Does not disappear
Chalk powder	Does not disappear
Sawdust	Disappears

Conclusion : We will notice that some solid materials, like, salt, sugar, completely disappear in water and thus, they are soluble in water. Whereas, other solid materials like, sand, chalk powder, sawdust do not disappear in water and thus, they are insoluble in water.

Viva Questions :

1. Name some solid materials, other than mentioned in the activity, which completely dissolve in water.
2. Does sand dissolve in water?

Activity 4 (Page 112-113)

Aim : To differentiate between heavier and lighter objects. Materials Required Paper cups, water, sand, pebbles and weighing balance.

Procedure :

1. Take three identical paper cups and mark them A, B and C.
2. Fill each paper cup half. Fill paper cup A with water, paper cup B with sand and paper cup C with pebbles.
3. Weigh each cup on the weighing balance and compare which material is heavier or lighter.
4. Note down the observations in the table below.

Cup	Material	Heavier or Lighter
A	Water
B	Sand
C	Pebbles

Observation :

Cup	Material	Heavier or Lighter
A	Water	Lighter
B	Sand	Heavier
C	Pebbles	Heavier

Conclusion : We notice that some materials are heavier, like pebbles, as it has more mass. While some objects are lighter, as they have less mass.

Viva Questions :
1. Which instrument will you use to measure which object is heavier or lighter?
2. Which one is heavier, wood or feather?

Do It Yourself (DIY)

1. Aim To separate the shiny objects from paper, cardboard, wood, copper wire, aluminium foil, silver chain, chalk.
2. Aim To observe whether different liquid samples (like vinegar, lemon juice, mustard oil, coconut oil, olive oil) are soluble or insoluble in water.

Curiosity Class 6 Science Book Solutions