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

Materials Around Us Class 6 Intext Questions

Page-104

Question 1.
Would it be a good idea to use paper-like materials for making cooking utensils?
Answer:
Paper-like materials may not withstand high temperatures or liquids well, making them less durable and less practical for cooking.

Page-108

Question 2.
Is water transparent? Can it be made opaque?
Answer:
Yes, water is naturally transparent, meaning that light can pass through it, allowing us to see through it clearly. However, water can be made opaque by mixing it with substances that scatter or block light. For example, adding materials like mud, milk or paint to water can make it cloudy or completely opaque, preventing light from passing through and obstructing visibility.

Page-111

Question 3.
Does everything you put in water disappear?
Answer:

• No, not everything put in water disappears. Some substances, like salt or sugar, dissolve in water. They spread evenly throughout the water, making them seem to disappear.
• Other materials, like sand or flour, don’t dissolve. Instead, they might form a suspension, where tiny particles float in the water for a while before eventually settling at the bottom.
• Some things, like oil or plastic, don’t mix with water at all and remain separate, floating on the surface or sinking to the bottom without disappearing.

Page – 115

Question 4.
Are there any properties which can be shown by all materials? If yes, what are those?
Answer:
Yes, there are certain properties that can be observed in all materials, regardless of their type. These include:
(i) Mass: All materials have mass, meaning they have weight. Mass is a fundamental property that can be measured in all substances, whether solid, liquid or gas.
(ii) Volume: Every material occupies a certain amount of space, which is known as its volume. This property is evident in solids, liquids and gases, though gases can expand to fill the available space.

Materials Around Us Class 6 Textbook Questions

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:
In a kitchen, various edibles are typically organised by categories, such as spices, grains, snacks and fresh products with less self-life.. A better sorting method could be to organise these items based on their frequency of use and shelf life. For example:

• Daily use items: Place items like salt, sugar and oil in easily accessible spots.
• Perishable items: Store fresh produce and dairy products in the refrigeratqr, grouped by type.
• Long shelf-life items: Keep grains, pulses, and dried spices in airtight containers, organised by type.
• Snacks and ready-to-eat items: Group these in a designated area for quick access.

This method ensures that frequently used items are easy to reach and perishable items are used before they spoil.

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

Answer:

Question 3.
The containers which are used to store materials in shops and at home are usually transparent. Give your reasons for this.
Answer:
Transparent containers are preferred because they allow you to see the contents inside without opening the container. This is particularly useful in shops and homes as it helps in:

• identifying contents quickly without the need to label or open containers.
• monitoring the quantity of contents so that you can easily see when an item is running low.
• ensuring the freshness of food so you can detect any spoilage or contamination visually.

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. [F]
Correction: Wood is opaque while glass is transparent.
(ii) Aluminium foil has lustre while an eraser does not. [T]
(iii) Sugar dissolves in water, whereas sawdust does not. [T]
(iv) An apple is a matter because it occupies no space and has mass. [F]
Correction: 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. The following are some desirable properties of materials that 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
(ii) Plastic, Bamboo
(iii) Wood, Bamboo
(iv) Plastic

Question 6.
You need to have containers for the 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:

1. Food waste: A plastic or metal container with a lid. The container should be easy to clean, resistant to corrosion and odour resistant.
2. Broken glass: A thick plastic or metal container. The container should be durable, puncture-resistant and able to prevent injury.
3. Wastepaper: A lightweight plastic or cardboard container. The container should be lightweight, easy to carry and recyclable.

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:
(i) Material X: Salt or sugar (since it is rigid and dissolves in water). Material X is hard.
(ii) Material Y: Rubber or clay (since it changes shape easily and does not dissolve in water). Material Y is soft.

Question 9.
(a) Who am I? Identify me on the basis of the given properties.
(i) I have lustre.
(ii) I can be easily compressed.
(iii) I am hard and soluble in water.
(iv) You cannot see clearly through me.
(v) I have mass and volume, but you cannot see me.
(b) Mąke your own ‘Who am I?’
(i) I am rigid and cannot be bent easily. I am commonly used in construction. Who am I?
(ii) I flow easily and take the shape of the container I am in. Who am I?
Answer:
(a) (i) Metal (e.g., gold, silver)
(ii) Sponge or foam
(iii) Salt or sugar
(iv) Frosted glass or plastic
(v) Air or any gas

(b) (i) Iron or steel
(ii) Water or liquid

Question 10.
You are provided with the following materialsvinegar, 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 (Vinegar is soluble in water)
(ii) Glucose and water (Glucose is soluble in water)

Insoluble pairs:
(i) Mustard oil and water (Mustard oil is insoluble in water)
(ii) Wheat flour and water (Wheat flour does not dissolve in water)

Materials Around Us Class 6 NCERT Exemplar Questions

Multiple Choice Questions

Question 1.
An iron nail is kept in each of the following liquids. In which case would it lose tts shine and appear dull?
(a) Mustard oil
(b) Soft drink
(c) Coconut oil
(d) Kerosene
Answer:
(b) Soft drink
Explanation: Soft drinks contain carbonic acid due to which iron nail is corroded and appears dull.

Question 2.
Pick one material from the following which is completely soluble in water.
(a) Chalk powder
(b) Tea leaves
(c) Glucose
(d) Sawdust
Ans.
(c) Glucose
Explanation: Glucose is completely soluble in water.

Question 3.
You are provided with the following materials
(i) Magnifying glass
(ii) Mirror
(iii) Stainless steel plate
(iv) Glass tumbler
Which of the above materials will you identify as transparent?
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)
Answer:
(c) (i) and (iv)
Explanation: Magnifying glass and glass tumblers are transparent.

Question 4.
Boojho found a bag containing the following materials.
(i) Mirror
(ii) Paper stained with oil
(iii) Magnet
(iv) Glass spectacles
Help Boojho in finding out the material (s) which is/are opaque.
(a) (i) only
(b) (iv) only
(c) (i) and (iii)
(d) (ii) and (iv)
Answer:
(c) (i) and (iii)
Explanation: Mirror is opaque since it is painted on one side. Magnet is opaque since it is made up of iron metal.

Question 5.
Which pair of substances among the following would float in a tumbler half-filled with water?
(a) Cotton thread, thermocol
(b) Feather, plastic ball
(c) Pin, oil drops
(d) Rubber band, coin
Answer:
(b) Feather, plastic ball
Explanation: Feather and plastic ball will float on water because they are lighter than water. Cotton thread will absorb water and eventually sink.

Question 6.
Which among the following are commonly used for making a safety pin?
(a) Wood and glass
(b) Plastic and glass
(c) Leather and plastic
(d) Steel and plastic
Answer:
(d) Steel and plastic
Explanation: Steel and plastic are used to make safety pins. Steel can be moulded to get sharp points and plastic can be used to seal the edges.

Question 7.
Which of the following materials is not lustrous?
(a) Gold
(b) Silver
(c) Wood
(d) Diamond
Answer:
(c) Wood
Explanation: Wood is not a crystalline substance and has no lustre.

Question 8.
Which of the following statements is not true?
(a) Materials are grouped for convenience.
(b) Materials are grouped to study their properties.
(c) Materials are grouped for fun.
(d) Materials are grouped according to their uses.
Answer:
(c) Materials are grouped for fun.
Explanation: Materials are not grouped for fun. They are grouped for convenience, to study their properties and according to their uses in a systematic manner.

Question 9.
Find the odd one dut from the following.
(a) Tawa
(b) Spade
(c) Pressure cooker
(d) Eraser
Answer:
(d) Eraser
Explanation: Tawa, pressure cooker, and spade are made of metal, while the eraser is made of rubber.

Question 10.
Which type of the following materials is used for making the front glass (windscreen) of a car?
(a) Transparent
(b) Translucent
(c) Opaque
(d) All the above
Answer:
(a) Transparent
Explanation: Transparent glass is used to make the wind screen of a car so that everything can be clearly seen:

Very Short Answer Type Questions

Question 11.
It was Paheli’s birthday. Her grandmother gave her two gifts made of metals, one old dull silver spoon and a pair of lustrous gold earrings. She was surprised to see the difference in the appearance of the two metals. Can you explain the reason for this difference?
Answer:
Gold is a noble metal it does not react with the gases present in the atmosphere. Silver reacts with some gases like hydrogen sulphide and loses its shine in moist air.

Question 12.
Mixtures of red chilly 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?
Answer:
Honey and water are miscible in each other hence a solution will be formed when honey is mixed with water. Raveena will get the mixture in solution form.

Question 13.
On a bright sunny day, Shikha was playing hide and seek with her brother. She hid herself behind a glass door. Do you think her brother will be able to locate her. If yes, why? If no, why not?
Answer:
Yes, because the glass door is translucent or transparent; hence, Shikha can be located.

Question 14.
Take a small cotton ball and place it in a tumbler/ bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?
Answer:
Initially, the cotton ball floats on water Slowly it absorbs water, becomes heavy and sinks in water.

Short Answer Type Questions

Question 15.
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.
Answer:
Rubber band, leaf, eraser, cooked rice and fresh chapati are soft materials because they can be scratched or compressed easily.

Question 16.
You are provided with the following materials turmeric, honey, mustard oil, water, glucose, rice flour and groundnut oil.
Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.
Answer:
I. Soluble pairs

• Honey – water
• Glucose – water
• Mustard oil – groundnut oil

II. Insoluble pairs

• Turmeric-water
• Mustard oil-water
• Rice flour – water

Question 17.
During summer holidays, a group of children collected a lump of salt, green grass, a broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, a naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table below. Help them in filling the table.

Answer:

Long Answer Type Questions

Question 18.
Chalk, iron nails, wood, aluminium, candles, cotton usually look different from each other. Give some properties by which we ‘can prove that these materials are different.
Answer:
Chalk – Hard, rough, non-lustrous, sinks in water Wood – Hard, rough, non-lustrous, floats on water. Aluminium – Hard, smooth, lustrous, sinks in water. Candle – Hard, smooth, non-lustrous, floats in water. Cotton – Soft, smooth, non-lustrous, sinks in water Iron nail – Hard, smooth, lustrous, sinks in water

Question 19.
Differentiate among opaque, translucent and transparent materials, giving one example of each.
Answer:
Opaque materials:
Definition: Opaque materials do not allow any light to pass through them. They block light completely, making objects on the other side completely invisible.

Example: Wood
Translucent materials:
Definition: Translucent materials allow some light to pass through. Objects on the other side are not clearly visible, but light can still pass through to create a diffused image.
Example: Frosted Glass

Transparent materials:
Definition: Transparent materials allow most of the light to pass through clearly. Objects on the other side can be seen clearly through transparent materials.
Example: Clear Glass

What are Materials?

Materials are substances or mixtures of substances that make up objects in our everyday environment. Everything we see and touch is composed of one or more materials. Common materials include:

• Paper: Used in books, notebooks and packaging.
• Wood: Used to make furnitures, doors and pencils.
• Cloth: Used to make garments, curtains and upholstery.
• Glass: Windows, bottles and mirrors are made up of glass.
• Metal: Used in utensils, tools and machinery.
• Plastic: Bottles, containers and toys are made up of plastic.
• Clay: Used in pottery, tiles and bricks.

Why are Materials Important?

Understanding materials helps us comprehend the physical world around us. All things are made up of some materials. The material from which an object is made affects its durability, functionality and aesthetic appeal. This understanding also influences the selection of materials for various uses.

Activity 6.1 (Page-102)

Identifying Materials

The teacher asked the students to take a close look at their surroundings and list the objects they observed. She then instructed them to identify the materials these objects were made from, leading to an insightful activity on the diverse materials used in daily life.

Table 6.1: Identifying Materials

I observe	Materials they are made up of
Notebook	Paper
Pen	Plastic, Metal, Ink
Table	Wood, Metal
Window	Glass, Metal
Water Bottle	Plastic, Metal

How to Group Materials?

Classification of Materials: The method of arranging the objects into groups is called classification. Objects can be classified on the basis of a common property that they have.

Activity 6.2 (Page-103)

Let Us Group

Grouping based on shape:

Spherical: Cricket ball, marble, keychain.
Cylindrical: Ruler, pen, pencil.
Rectangular: Books, notebook, ruler.

Grouping based on material:

• Metal: Spoon, lock, key, paper punch, nail, tumblé.
• Plastic Ruler, pen.
• Wood: Ruler, spinning wheel , pencil, ice-cream stick
• Paper: Books, notebook, paper cup.
• Stone: Stone.
• Glass: Watch glass, marble.
• Clay: Planter, diya (oil lamp).
• Cork, wool, leather, wood: Cricket ball.
• Rubber: Eraser.

Grouping based on colour:

• Red: Pencil, ball, book.
• Green: Plant, marble.
• Blue: Marble, pen.
• Yellow: Marble, notebook, paper cup.
• White: Eraser, stone, ice-cream stick.
• Silver: Ruler, , lock, key, paper puncher, nail, tumbler.

Grouping based on hardness:

• Hard: Stone, metal objects (spoon, lock, key, pliers, nail), wooden objects.
• Soft: Eraser, plant, paper, Grouping based on shine.
• Shiny: Metal objects (spoon, lock, key, pliers, nail), watch glass.
• Dull: Stone, ice-cream stick, spinning wheel, , paper cup, eraser, ball, book, note book.

Property used to group objects:

In this activity, the material of the objects is used to group them. However, other properties like shape, colour, hardness, softness, shine and dullness could also be used to classify the objects.

Friends’ groupings:
It’s likely that my friends grouped the objects based on different properties, depending on their individual perspectives and observations. This could lead to a variety of valid groupings.

Learning from this activity:

• An object can be made from different materials.
• A material can be used to make more than one object.
• Objects can be classified based on common properties.
• The method of arranging objects into groups is called classification.

Choosing Materials for Objects:

When creating objects, the choice of material is crucial. The selection of a material depends on its properties and the intended use of the object. For example:
A tumbler must be made of a material that can hold liquids, such as glass, plastic or metal.
A sweater should be made of a soft, warm material like wool or acrylic.

Activity 6.3 (Page-104)

Let Us think

The students were asked to consider various materials that could be used to make a tumbler. They were encouraged to think about why certain materials were better suited for this purpose. The materials that are required to make a tumbler should be capable of holding water.

Question 1.
Why cannot a tumbler made of cloth be used for storing water?
Answer:
A cloth tumbler can’t store water because cloth absorbs liquids, lacks structural integrity to hold water and allows leakage. It’s also challenging to clean and maintain hygiene. In contrast, materials like plastic, glass or metal are used for their non-absorbent, durable and leak-proof properties.

Question 2.
Who decides which material should be used for making an object?
Answer:
We choose a material to make an object depending on its properties and the purpose for which the object is to be used.

Question 3.
Why are different materials used for making balls for various sports?
Answer:
Different materials are used for sports balls to match the requirements of each sport. For example, rubber or synthetic materials provide bounce and durability for basketballs, while leather or synthetic covers enhance grip and control for soccer balk. Each : material optimises performance and meets the specific needs of the game.

Question 4.
Can a cricket ball be used to play tennis?
Answer:
No, a cricket ball cannot be used to play tennis. Cricket balls are heavy and hard, while tennis balls are lighter and softer, designed for bouncing and controlled play on a tennis court. Using a cricket ball in tennis would make the game unsafe and impractical.

Activity 6.4 (Page-105)

Let Us explore

Figure 6.3 illustrates a variety of balls that are of the same size but made up of different materials.

• Take each ball and drop it from a fixed height.
• Note the height to which the ball bounces and record it.

Table 6.2: Bouncing Level of the Balls

Ball	Bounces (high, medium or low)
Tennis ball	High
Cricket ball	Medium
Hand exercise ball	Low
Golf ball	Medium

Identify the ball that achieves the highest bounce.

Tennis ball will bounce the highest bounces due to its composition and design. The bouncing height of a ball is influenced by its material and design. A ball with a more elastic core and a lighter outer shell will generally bounce higher than a ball with a denser core and a heavier outer shell.

Observe Figure 6.4 and group the objects in different ways as possible.

Based on shape:

• Cones: The objects with a circular base and a pointed top.
• Cubes: The objects with six square faces.
• Prisms: The objects with two parallel polygonal bases and three rectangular lateral faces.
• Diapond shaped polygon: The objects with all four sides equal and diagonals intersecting at right angles.

Based on colour:

• Pink: Objects with a pink colour.
• Yellow: Objects with a yellow colour.
• Blue: Objects with a blue colour.
• Purple: Objects with a purple colour.

Properties of Materials
Let’s discuss the various properties of materials that affect their usage in daily life.

Appearance :

Materials often vary in appearance. For example:

• Lustrous materials like metals (iron, copper and aluminium) have a shiny surface: This property is known as lustre.
• Non-lustrous materials like wood, rubber and paper do not shine.

Observing Luster
The teacher brought various objects to the class and asked the students to observe which ones were shiny (lustrous) and which ones were dull (non-lustrous).

Object	Lustrous/Non-Lustrous	Material
Steel Spoon	Lustrous	Metal
Wooden Table	Non-Lustrous	Wood
Plastic Bottle	Non-Lustrous	Plastic
Silver Ring	Lustrous	Metal
Rubber Band	Non-Lustrous	Rubber

Hardness and Softness :

Materials differ in their hardness. Hard materials cannot be easily compressed, while soft materials can be compressed or scratched easily.

Observing Hardness

The students were asked to press or scratch various objects to determine whether they were hard or soft. The teacher used a metal key to demonstrate how to test the hardness of different materials,

Activity 6.5 (Page-107)
Let Us Observe
Students were given a list of objects and asked to classify them as hard or soft and the material they are made up of.

Object	Hard/Soft	Material(s)
Brick	Hard	Baked clay
Water	Hard	Plastic (e.g., polyethylene terephthalate (PET))
bottle	Soft	Cotton, polyester or other syñthetic fibres
Pillow	Hard	Glass, metal or ceramic
Tumbler	Hard	Wood, metal or glass
Table	Soft	Wool, cotton or other textile fibres
Sweater	Hard	Paper, cardboard

Transparency

Materials can also be categorised based on their transparency:

• Transparent: Objects can be clearly seen through these materials (e.g., glass).
• Translucent: Objects can be seen but not clearly (e.g, frosted glass).
• Opaque: Objects cannot be seen through these materials (e.g., wood).

In the game of hide and seek, Ghulan, Sheeta and Sara chose their hiding spots based on how visible they were through different materials:

1. Ghulan hides behind a wall, which is opaque. This means no light passes through it, so Ghulan is completely hidden from view.
2. Sheeta hides behind a big tree. The tree is opaque as well, making it impossible for others to see through it, thus providing good cover.
3. Sara hides behind a frosted glass door, which is translucent. While she is not completely visible, the frosted glass allows some light to pass through, making it hard to see her clearly.
4. Sheeta’s younger brother hides behind a glass window and can be seen through the it because glass is transparent, meaning it allows clear visibility.

Activity 6.6 (Page-109)

Let Us Classify
Students were given a list of objects and asked to classify them as transparent, translucent or opaque.

Transparency of Objects

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

Solubility

Some materials dissolve in water and are termed soluble, while others do not dissolve and are called insoluble.

Activity 6.7 (Page-110)

Solubility in Water

The teacher demonstrated how different substances : behave when mixed with water. Students observed and recorded whether the substances dissolved.

Table 6.5: Solubility of Materials in Water

Material	Prediction (Will disappear in water/will not disappear in water)	Observation (Disappears in water/ does not disappear in water)
Sugar	Will disappear
Salt	Will disappear	Disappears in water
Chalk	Will not disappear	Disappears in water
Powder	Will not disappear	Does not disappear in water
Sand	Will not disappear	Does not disappear in water
Oil	Prediction (Will disappear in water/will not disappear in water)	Does not disappear in water

1. Do liquids like oil, vinegar and honey dissolve in water? Explore.
Oil: Oil does not dissolve in water. This is because oil is non-polar and water is polar. Polar substances dissolve in polar solvents, and non-polar substances dissolve in non-polar solvents. The lack of attraction between the polar water molecules and non-polar oil molecules prevents the oil from mixing with water. Instead, oil tends to form a separate layer on top of the water due to its lower density.

Vinegar: Vinegar, which is primarily acetic acid in water, does dissolve in water. Vinegar is polar and its molecules can interact with water molecules through hydrogen bonding. This allows vinegar to mix completely with water, forming a homogeneous solution.

Honey: Honey dissolves in water to some extent. Honey is a complex mixture of sugars (mainly fructose and glucose) and other compounds, and it is somewhat polar. The sugars in honey can interact with water molecules through hydrogen bonding, allowing honey to dissolve and mix with water, though it may take some time and stirring.

2. What about the gases present in water?

• Oxygen (O₂) : Moderately soluble; essential for aquatic life.
• Carbon Dioxide (CO₂): More soluble; forms carbonic acid, affecting pH.
• Nitrogen (N₂) : Low solubility; minimal impact.
• Hydrogen (H₂) : Very low solubility; negligible presence.
• Other Gases: Methane (CH₄) and ammonia (NH₃) have varying solubilities; ammonia is more soluble and affects pH.

Floating and Sinking

Materials have different behaviours when placed in water-some float, while others sink.
Floating or Sinking
Students dropped various objects into the water to see if they floated or sank.

Mass and Volume

Mass is the amount of matter in an object, while volume is the amount of space an object occupies.

Activity 6.8 (Page-112)

Measuring Mass
Measuring Mass
Use a balance to compare the mass of different objects, such as cups filled with different materials.

• Heaviest: Cup C (Pebbles) – 250 grams
• Medium Weight: Cup B (Sand) – 200 grams
• Lightest: Cup A (Water) – 150 grams

To illustrate this concept of space and volume, two identical glass tumblers were given to two students. They were asked to pour the remaining water from their drinking bottles into the tumblers. As they did, one tumbler was filled halfway, while the other was nearly full.
Why did the water levels differ between the two tumblers, even though they were identical?
The difference in water levels between the two identical tumblers can be explained as follows:
1. Volume Concept: The volume of water a container holds is the space it occupies. Even with identical tumblers, the amount of water can vary if the containers aren’t filled to the same level.
2. Observation: Pouring water into two identical tumblers might result in one being filled halfway while the other is nearly full. This indicates different amounts of water in each tumbler.
3. Practical Example: Similar to how drinking bottles are labelled with their volume (e.g., 500 mL), the actual volume of water in each tumbler depends on how much water was transferred.

1. Why was I not able to transfer water from the jug into an empty water bottle completely?
Answer:
If not all water from a jug transfer to a bottle, it could be because the bottle is already full or due to air bubbles and leftover water.

What is Matter?

Matter is anything that occupies space and has mass. It can be classified into different types based on its properties.

Mass and Volume:

• Mass: This measures the quantity of matter and is measured in grams (g) and kilograms (kg).
• Volume: This measures the space occupied by matter and is measured in litres (L) and millilitres (mL).

Examples of Matter:

• Water: Occupies space and has mass.
• Sand and Pebbles: Also matter because they occupy space and have mass.
• Cup: The cup itself is,matter as it has mass and occupies space.

Material Classification:

• Materials are different types of matter used to make objects.
• Just as we classify living organisms based on their characteristics, we classify non-living materials based on their properties to understand and observe patterns.

1. Can all the materials around us be considered as different examples of matter?
Answer:
Yes, all materials around us can be considered different examples of matter. Matter is anything that has mass and occupies space, so materials like water, sand, pebbles and objects such as cups are all forms of matter.

2. Can you think about what changes the invention of plastic brought to humans? Is it a boon or a bane?
Answer:
The invention of plastic has had significant impacts on human life, both positive and negative. Here’s a brief overview of its effects:

Boon (Positive Impacts):

1. Versatility: Plastics can be moulded into countless shapes and used in various applications, from packaging to medical devices.
2. Cost-Effective: Plastics are generally cheaper to produce than many alternatives, making products more affordable.
3. Durability: Plastics are resistant to water and many chemicals, extending the lifespan of products.
4. Convenience: They are lightweight and flexible, making them ideal for items like disposable cutlery and packaging.

Bane (Negative Impacts)

1. Environmental Pollution: Plastics can take hundreds of years to decompose, leading to significant waste and pollution.
2. Harm to Wildlife: Plastic waste can harm animals that ingest or become entangled in it.
3. Health Concerns: Some plastics can release harmful chemicals, affecting human health.

Keywords

• Lustrous: Shiny or reflective surface, often seen in metals like gold and silver.
• Volume: The amount of space occupied by a substance or object, measured in cubic units.
• Transparent: A material that allows light to pass through so objects behind can be seen clearly.
• Translucent: A material that allows some light to pass through but scatters it, making objects appear blurry.
• Soluble: A substance that can dissolve in a solvent, like salt in water.
• Soft: A material that can be easily compressed, bent, or cut, like rubber or cotton.
• Hard: A material resistant to deformation, scratching, or cutting, like steel or diamond.
• Insoluble: A substance that does not dissolve in a solvent, like sand in water.
• Material: Any substance used to create or build things, including wood, metal, or plastic.
• Matter: Anything that has mass and occupies space.
• Mass: The amount of matter in an object, measured in kilograms or grams.

Curiosity Class 6 Science Book Solutions