NCERT Solutions for Class 6 Science Chapter 6 Material Around Us

NCERT Solutions for Class 6 Science Chapter 6 Material Around Us 

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.
Solution
Yes, food items can be sorted like this:
(1) Pulses (moong dal, chana dal, urad dal, etc.) in one group
(2) Cereals (rice, wheat flour, maize flour, etc.) in another
(3) Spices (turmeric, cumin, pepper, etc.) in one section
(4) Oils and ghee together
(5) Jams and squashes in another section

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

Answer

(i) Matter	(b) Occupies space and has mass
(ii) Soluble	(d) Mixes completely in water
(iii) Transparent	(a) Objects can be seen clearly through it
(iv) Lustre	(c) 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
Containers used to store materials in shops and at home are often transparent to make it easy to identify the contents inside the containers.

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. [ ]
(ii) Aluminium foil has lustre while an eraser does not. [ ]
(iii) Sugar dissolves in water whereas sawdust does not. [ ]
(iv) An apple is a matter because it occupies no space and has mass. [ ]
Answer
(i) False
Wood is opaque while glass is transparent.
(ii) True
(iii) True
(iv) False
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 fulfil 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) Iron, Cement, Stones.
(ii) Plastic, Bamboo.
(iii) Wood and bamboo chairs does not feel very cold when sitting during winters.
(iv) Plastic and iron chairs can be cleaned regularly and made to look new even after long use.

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 are ideal for storing food waste because they are durable, resistant to corrosion and easy to clean.

(ii) Broken glass: Metal or hard plastic containers should be used for collecting broken glass due to their durability and toughness.

(iii) Wastepaper: Light weight plastic or cardboard containers work well for collecting wastepaper.

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
X can be sugar crystal and Y can be rubber block.
The material X is hard.
The material Y is soft.

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
(i) (a) metal, steel
(b) gas ,rubber
(c) salt, sugar
(d) cardboard or plywood
(e) air

(ii) Make your own ‘Who am I?’
Answer
(a) You can see clearly through me
(b) I am soft
(c) I am non-lustrous
(d) I am liquid and insoluble in water
(e) I cannot be compressed easily.

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

Two pairs of materials where one material is soluble in the other.

1. Vinegar and water.
2. Glucose and water.

Two pairs of materials where one material remains insoluble in the other material.

1. Mustard oil and water.
2. Honey and mustard oil.