Materials Around Us Class 6 Extra Questions and Answers Science Chapter 6

Class 6 Science Chapter 6 Extra Questions Materials Around Us

Class 6 Science Chapter 6 Materials Around Us Important Extra Questions and Answers

Materials Around Us Class 6 Extra Questions Very Short Answer Type

Question 1.
Write two things which are made from glass.
Answer:
Bowls and mirrors are made from glass.

Question 2.
Why do we need to group materials in everyday life?
Answer:
We need to group materials for our convenience. Grouping materials helps us to locate things easily.

Question 3.
Name two materials which appear shiny.
Answer:
Aluminium and iron appear shiny.

Question 4.
Why iron appears different from copper and aluminium?
Answer:
Iron appears different from copper and aluminium because it reacts with air and moisture and lose its shine after some time and appears dull, but in case of copper and aluminium, these maintain their shine for long time.

Question 5.
Give the reason why some metals become dull and lose their shine (lustre)?
Answer:
Some metals lose their shine because they react with moisture and gases present in air, and forms a dull layer of some other materials on it.

Question 6.
Metals usually lose their shine when they are exposed to air and water. How can you get their shine back?
Answer:
Metals are freshly cut or their surface is scratched to get their shine back.

Question 7.
By which property, steel and sponge differ from each other?
Answer:
Hardness and softness is the property by which steel and sponge differ from each other because steel is hard while sponge is soft.

Question 8.
On a bright sunny day, Shikha was playing hide and seek with her brother. She hide herself behind a glass door. Do you think her brother will be able to locate her? If yes, why? If no, why not? Competency Based ques.
Answer:
Yes, her brother can easily locate her because glass door is a transparent material.

Question 9.
Write the name of two objects which are made from opaque materials.
Answer:
Blackboard and wooden doors are objects which are made from opaque materials.

Question 10.
Write two objects through which things can be seen clearly.
Answer:
Polythene bags and glass container are the transparent objects through which things can be seen clearly.

Question 11.
Why a shopkeeper prefers to keep biscuits and sweets in a glass or plastic container?
Answer:
Due to transparent nature of glass or plastic container, biscuits, sweets, etc. can be seen easily by buyers. Hence, shopkeepers store them this way.

Question 12.
List the following substances as soluble and insoluble in water.
Sand, sugar, vinegar, common salt, chilli, ghee.
Answer:
(i) Soluble: sugar, vinegar, common salt.
(ii) Insoluble: sand, chilli, ghee.

Question 13.
Mixtures of red chilli powder in water, butter in water, petrol in water and honey in water were given to Radha, Sudha, Sofia and Raveena, respectively. Whose mixture is in solution form? NCERT Exemplar
Answer:
Raveena has got a solution because honey will dissolve in water whereas red chilli powder, butter and petrol do not dissolve in water.

Question 14.
Are vinegar and lemon juice soluble or insoluble in water?
Answer:
Vinegar and lemon juice are completely soluble in water.

Question 15.
Write two names of liquid which are insoluble in water.
Answer:
Mustard oil and kerosene oil are the two liquids which are insoluble in water.

Question 16.
Do all liquids dissolve in water?
Answer:
Some liquids get completely dissolved in water. But, some others do not dissolve in water and form a separate layer when kept a side for some time.

Question 17.
Do all gases also dissolve in water?
Answer:
Some gases dissolve in water whereas others do not. Water usually has small quantities of some gases dissolved in it, e.g. oxygen gas is dissolved in the water.

Question 18.
Define space.
Answer:
Space is the amount of area an object occupies, which can vary depending on its shape and size.

Question 19.
The volume can be measured by which two units?
Answer:
The volume can be measured by using two units litre (L) and millilitre (mL).

Question 20.
What is matter?
Answer:
Anything that occupies space and has a mass is called matter.

Materials Around Us Class 6 Extra Questions Short Answer Type

Question 1.
Name two objects which can be made from the given materials:
(a) Glass
(b) Wood
(c) Iron
(d) Gold
Answer:
(a) Glass :Window pane, tumbler, bowl.
(b) Wood: Table, chair.
(c) Iron: Rods, iron nails
(d) Gold: Jewellery, coins.

Question 2.
List some materials that are used for making more than one type of an object.
Answer:
Some materials that are used for making more than one type of an object are:
Wood: chair, table, plough, bullock cart and its wheels.
Paper: books, notebooks, newspaper, toys, calendars. Leather: shoes, belts, wallets, bags and photo albums. Plastic: buckets, lunch boxes, toys and pipes.

Question 3.
Why are different materials used for making different objects?
Answer:
A different materials have different properties. Materials are chosen to make objects depending on its properties and the purpose for which the object is to be used.

Question 4.
It was Paheli’s birthday. Her grandmother gave her two gifts made up of metals, one old dull silver spoon and a pair of lustrous gold ear-rings. She was surprised to see the difference in the appearance of the two metals. Can you explain the reason for this difference? NCERT Exemplar
Answer:
The silver spoon on long exposure to moist air has lost its shine and appears dull whereas gold does not tarnish because it does not react with moisture and air.

Question 5.
Which among the following materials would you identify as soft materials and why?
Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapati. NCERT Exemplar
Answer:
Materials which can be compressed or scratched easily are called soft materials.
Among the given materials, rubber band, leaf, eraser, cooked rice and fresh chapati are soft materials because they can be compressed or scratched easily.

Question 6.
You are provided with the following materials: Turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil. Make any three pairs of substances where one is soluble in the other and any three pairs of substances where one substance is insoluble in the other.
Answer:
Substances which are soluble:
(i) Honey in water
(ii) Glucose in water
(iii) Groundnut oil in mustard oil
Substances which are insoluble:
(i) Turmeric in water
(iii) Mustard oil in water
(ii) Rice flour in water

Question 7.
Give two examples of gas which dissolve in water.
Answer:
Two examples of gas that dissolve in water are as follow,
(i) Oxygen gas dissolved in water which is very important for the survival of animals and plants that live in water.
(ii) Carbon dioxide also dissolves in water.

Question 8.
Our palm is translucent. Explain with an activity.
Answer:
Cover the glass of a torch with your palm at a dark area. Switch on the torch and observe from the other side of palm. We see that the light of torch passes through the palm, but not clearly. This demonstration shows that our palm shows the property of translucency when a strong beam of light passes through it.

Question 9.
There are two objects, one weighs 1 kg and other weighs 10 kg , which one will have more mass and why?
Answer:
The 10 kg object will have more mass as the object which is heavier is said to have more mass and the object which is lighter is said to have less mass.

Question 10.
Define the following terms:
(a) Object
(b) Classification
(c) Mass
(d) Volume
Answer:
(a) A thing which can be seen and touched is called an object.
(b) The method of arranging the objects into groups is called classification.
(c) Mass is the amount of substance that makes up an object.
(d) The amount of space occupied by a liquid is called its volume.

Materials Around Us Class 6 Extra Questions Long Short Answer Type

Question 1.
Differentiate between the following. (Provide one point of difference and give examples of each)
(a) Natural and Man-made materials
(b) Transparent, Translucent and Opaque Materials
Answer:
(a) Natural materials are found in nature, like, wood, cotton, wool, water, silk, sand, coal, rocks, gold, etc.
While, man-made materials, also known as synthetic materials, are created by humans and do not occur naturally, for example, plastic, nylon, polyester, iron, steel, paper, paints, sugar, brass, glass, cement etc.

(b) Transparent materials are materials through which we can see clearly. For example, glass, air, water, alcohol, cellophane paper, etc. Translucent materials are materials through which we cannot see clearly. For example, butter paper, frosted glass, oiled paper, clouds, etc. Opaque materials are materials through which we cannot see at all. For example, cardboard, rocks, bricks, wood, stone, metals, notebook etc.

Question 2.
Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different. NCERT Exemplar
Answer:
We can differentiate these materials on the basis of lustre, hardness, softness, roughness or smoothness.

Question 3.
Describe that the sugar is soluble in water, while sand is insoluble in water.
Answer:
Refer to Activity 3 on page no. 87.

Question 4.
Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of flower, soil, copper sulphate crystals, glucose, wheat flour are some substances given to Paheli. She wants to know whether these substances are soluble in water or not. Help her in identifying soluble and insoluble substances in water.
Answer:
Substances soluble in water are sugar, salt, honey, copper sulphate crystals, glucose. Substances insoluble in water are mustard oil, sand, sawdust, chalk powder, petals of flower, soil, wheat flour.

Question 5.
Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants? NCERT Exemplar
Answer:
Oxygen gas dissolves in water, i.e. oxygen gas is soluble in water. The plants and animals which live in water use the oxygen dissolved in water for respiration. Thus, oxygen gas dissolved in water is very important for the survival of animals and plants that live in water.

Materials Around Us Class 6 Extra Questions Skill Based

Question 1.
A group of students were given a few materials to test, such as sugar, chalk, sand, baking soda and epsom salts in water. They were asked to mix the contents by adding a tablespoon of each material to different containers of water having equal amount of water. Experimental Skili State the materials which are soluble in water.
Answer:

Materials used State (disappear/does not disappear in 50 mL of water)
(a) Sugar (i) Disappears completely
(b) Chalk (ii) Does not disappears completely
(c) Sand (iii) Does not disappears completely
(d) Baking soda (iv) Disappears completely
(e) Epsom salt (v) Disappears completely

Among the given materials taken in the experiments, sugar, baking soda and epsom salt are water soluble.

Question 2.
Read the given passage carefully and answer the following questions.
Rachel wants to make her brother John happy by performing magic. She took a glass beaker and partially filled it with water. She then took a spoon full of white magical powder (X) and showed it to her brother. She then covered the beaker with her hand and mixed the contents of the spoon into it. She then said some magical words and showed the beaker. John clapped happily and exclaimed that “the powder has vanished!”. She then took another powder (γ) and did the same. This time as she said the magical words, the powder settled at the bottom of the beaker. She then explained to John how she could do Analytical Skill
(i) If Rachel had common salt, wheat flour, sawdust and chalk powder, then which one do you think she would have selected as ‘ X ‘.
(ii) Substances like ‘ X ‘ that mix well with water leaving no trace are called ____.
(iii) If Rachel had taken colourless vinegar instead of ‘ X, would it have given the same result? Justify your answer in a sentence.
(iv) If the given substances were wheat flour, sugar and common salt. Identify the possible substance from the list that could be ‘γ.
Answer:
(i) Among the given materials, $X$ must be common salt as it vanished when Rachel dissolves it in water.
(ii) Soluble substance.
(iii) When Rachel had taken vinegar instead of $X$ then it would give the same result because it dissolved completely in water.
(iv) Among the given substances, $Y$ must be wheat flour because, it does not completely dissolved in water and get settled down at the bottom.

Question 3.
During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table. Help them in filling the table.
Research Skill
Materials Around Us Class 6 Extra Questions and Answers Science Chapter 6 1
Answer:
Materials Around Us Class 6 Extra Questions and Answers Science Chapter 6 2

Question 4.
Read the given passage carefully and answer the following multiple choice questions.
Shikha has three objects X, Y and Z. The objects X and Y grow, reproduce and requires food, water and air to survive, whereas, object Z does not possess these characteristics. The object X can make its food on its own by the process T, using sunlight, water and S gas, but object Y cannot prepare their own food and have to move around to find food and water.

Analytical Skill :

(i) Which object(s) is/are considered to be living objects?
(a) Object X only
(b) Object Y only
(c) Object X and Y
(d) Object Z only
Answer:
(c) Object X and Y

(ii) Which object(s) is/are considered to be non-living objects?
(a) Object X only
(b) Object Y only
(c) Object X and Z
(d) Object Z only
Answer:
(d) Object Z only

(iii) Which object(s) can be classified as plants?
(a) Object X only
(b) Object Y only
(c) Object X and Y
(d) Object Z only
Answer:
(a) Object X only

(iv) Which object(s) can be classified as animals?
(a) Object Z only
(b) Object Y only
(c) Object X and Z
(d) Object X only
Answer:
(b) Object Y only

Question 5.
Priya and Ravi are testing what happens when they stretch different materials. Priya has a rubber band and Ravi has a wooden stick. They both try to stretch their materials.
What do you think will happen to the rubber band and the wooden stick when they are stretched?
Experimental Skill
Answer:
Rubber band being a soft material can be streched easily, whereas, wooden stick being a hard material cannot be streched.

Class 6 Science Extra Questions