NCERT Solutions for Class 3 EVS Chapter 10 This World of Things

Chapter 10: This World of Things

Question 1. Let's take a Look Around us! Can you name the things that Khushi has drawn? Write in the boxes given.
Answer: Khushi has drawn several everyday items found inside and outside a classroom:
* Light bulb (hanging from the ceiling)
* Blackboard (on the front wall)
* Door (on the right side)
* Chair (next to the desk)
* Desk (in front of the blackboard)
* Switchboard (near the window)
* Window (on the left wall)
* Bird (sitting on a branch outside)
* Rock (on the ground outside)
* Tree (visible through the window)
* Floor mats (on the classroom floor)
In simple words: The drawing displays a classroom with basic items like a door, a desk, a board, and a glass window looking out at a tree.

Exam Tip: Label the items by following the lines pointing to each object carefully to avoid putting names in the wrong boxes.

Question 2. Do you see the window glass? Why or why not?
Answer: Yes, I can see through the glass window because glass is clear (transparent). Clear materials let light pass all the way through, so we can see things on the other side easily.
In simple words: Glass is completely clear, which means light goes right through it and we can see trees and birds outside.

Exam Tip: Use the word "transparent" to describe objects like glass that let you see through them perfectly.

Question 3. Activity 1. Draw a picture of your classroom in your notebook. Label the things that you have drawn.
Answer: Here is a neat drawing of a cozy school classroom with its essential labeled furniture: In simple words: This picture shows a classroom setup with a green writing board, a wooden desk, a student chair, and a hanging bulb.

Exam Tip: When drawing a classroom, focus on large objects first, like the board and desks, before adding smaller details.

Question 4. Activity 2. Spot the metals. Find as many things or parts of things, that are made of metals. Which metals do you recognise around you? If you do not know the name of the metal, ask your friends or an elder. Make a list of these metals in your notebook.
Answer: We can spot many metal parts on everyday things around us:
* Door Hinges: Made of strong iron or steel.
* Nails: Made of tough steel or iron.
* Window Latches: Made of shiny brass, steel, or aluminium.
* Light Bulb Base: Usually made of brass or aluminium.
* Door Handles: Made of stainless steel or yellow brass.
* Desk and Chair Legs: Made of strong iron or aluminium.
* Coins: Made of copper and nickel.
* Spoons and Forks: Made of clean stainless steel.
* Paper Clips: Made of thin steel wire.
* Sharpener Blade: Made of very sharp steel.
In simple words: Metals like steel, iron, brass, and copper are used to make strong things like nails, door handles, and spoons.

Exam Tip: Mention both the object (like a nail) and the specific metal it is made of (like iron or steel) to get full marks.

Question 5. What are other things in the classroom, such as, mats, bulbs and electric switches, made of?
Answer: Classroom objects are crafted from a variety of materials depending on their purpose:
* Mats: These are woven from plastic, rubber, jute, or cotton cloth.
* Bulbs: The outer bulb is clear glass, the glowing thin wire inside is made of tungsten metal, and the round base is brass or aluminium.
* Switches: The safe outer box is made of hard plastic, but the secret metal parts inside are made of copper or brass to carry electricity.
In simple words: We use plastic for switches because it is safe, glass for bulbs because it lets light shine, and soft jute or rubber for floor mats.

Exam Tip: Explain that switches are covered in plastic because plastic is safe and does not let electricity shock us.

Question 6. See-through materials! Khushi was sitting at her desk. She could see a tree laden with beautiful flowers. She reached out to touch them. Her hand touched the glass pane. At first, Khushi did not notice the windowpanes. They were made of glass and she realised that she had been able to see the flowers and trees through the glass. Glass is like that!
• Does your window have a glass pane?
• Can you see through it?
• What do you see?
Answer:
* Yes, our classroom window has a flat glass pane.
* Yes, we can see through it easily because it is transparent.
* We can see green trees, colorful garden flowers, and birds flying in the sky outside.
In simple words: Glass is so clear that we sometimes forget it is there. It let us look outside at the garden and sky.

Exam Tip: Practice spelling "transparent" and understand that it means we can see through it perfectly.

Question 7. Activity 3. Seeing through things. Collect a few small objects of different materials from your surroundings like bottles, papers, cloth and utensils, etc. Look at a light bulb or a candle flame through them. You can see through some objects very clearly, you can partially see through some others, while you cannot see through some objects at all. Order these objects from those you can see through very clearly, to those you cannot see through at all.
Answer: Based on our experiments, objects can be grouped by how much light they let through:

In simple words: Clean glass lets all light through. Frosted glass lets only some light through. Wood and metal block all light.

Exam Tip: Learn the three key science terms: transparent (clear), translucent (blurry), and opaque (solid block).

Question 8. Activity 4. Let us colour the world! Collect two or three see through bags, bottles or thin cloth of different colours. Look at a sheet of white paper through them.
• Does the colour of the paper appear to change?
• Does white paper appear different when you look at it through thin blue plastic or glass? Or, thin yellow plastic or glass?
• Do the colours of different objects appear to change? How did a blue object look through thin yellow plastic? Have you earlier experienced looking through coloured transparent objects? Try to recall such experiences.
Answer:
* Yes, the white paper looks colored when we peek through a tinted plastic bag. It takes on the color of the bag we use.
* Looking through blue plastic makes the paper look blue, and looking through yellow plastic makes it look yellow.
* Yes, other colored things change too. A blue toy seen through yellow plastic looks greenish because the yellow and blue colors mix.
* Yes, it is like wearing colored sunglasses or peeking through colored candy wrappers. It changes how all the colors look around us!
In simple words: When we look through colored transparent sheets, they act like filters and change the colors of everything behind them.

Exam Tip: Remember that looking at a blue object through a yellow sheet makes it appear green because yellow and blue mix to make green.

Question 9. Chain game.
• In the table below, Khushi has grouped objects according to the materials that they are made of. Her list of objects is in the first column of the table. The names of the materials are in the second column.
• The third column of the table is for you to complete. Here write the names of some objects you have seen that are made from that material. Some objects around you may be made from materials not in this list, e.g., clay and rubber are missing in Khushi's list. Use one of these to add an additional row in the table.
Answer: Here is the completed table with matching everyday items:

In simple words: Different materials are used to make different things. For example, wood makes chairs, glass makes jars, and rubber makes bands.

Exam Tip: Think about your own pencil box or school bag to find easy examples of plastic and metal objects.

Question 10. Where do all these materials come from? Can you locate their source? For example, Wood - Tree
Metals - ________
Cloth - ________
Answer: Every material we use is obtained from a natural source:
* Wood comes from: Trees.
* Metals come from: Rocks dug out of the ground (ores).
* Cloth comes from: Cotton plants or animal wool.
In simple words: Wood is harvested from trees, metals are mined from deep rocks, and cloth is made from plants or animal fur.

Exam Tip: Be sure to distinguish between plant-based (wood, cotton) and earth-based (metal ores) sources.

Question 11. Talk to your grandparents.
• In their childhood, were these things made of the same materials?
• Are there new materials now that they might not have seen before?
• Are there materials that they saw in their childhood that are not in use now? Why?
Answer:
* My grandparents told me that when they were young, most furniture and toys were made of wood or metal, not plastic.
* Today, plastics and fake cloths like polyester are everywhere. Back then, clothes were made only of natural cotton or wool.
* Long ago, kids played with tin or aluminum toys. Today, plastic toys are more common because they are cheaper and lighter. They also used woven jute bags instead of plastic carry bags.
In simple words: Long ago, plastic was not common. People used wood, metal, cotton, and jute for almost everything.

Exam Tip: Mention that plastic became popular because it is cheap and easy to mold, but it is not as eco-friendly as wood or metal.

Question 12. • What material is your spoon made of?
• Is it made of metal, wood or some other material? Can you guess?
• Which of these words or phrases describes the spoon? Smooth, Rough, Dull, Shiny, Feels cold to the touch
Answer:
* My daily eating spoon is made of metal (stainless steel).
* I can tell it is metal because it is hard, stiff, and does not break easily.
* The spoon is smooth, shiny, and feels cold when I touch it.
In simple words: Everyday metal spoons are smooth, shiny, hard, and feel chilly when you first touch them.

Exam Tip: Feeling cold to the touch and having a shiny surface are key properties of metallic objects.

Question 13. Activity 5. Take a metal spoon and at least five objects made up of different materials - wood, metal, plastic, cloth and glass. Gently tap the spoon on each of them. Listen to the sound that each of them makes. Make your own words to describe all these different sounds. Try to capture those sounds in words, like ting-ting, dhum-dhum, dub-dub, ... Now compose your own beats.
Answer: When I tap the metal spoon, each material makes a unique sound:
* Glass makes a high "ting-ting" sound.
* Wood makes a deep "thud-thud" sound.
* Plastic makes a light "tap-tap" sound.
* Cloth makes a soft "flop-flop" sound.
* Metal makes a loud, ringing "clang-clang" sound.
Now here is my beat: "Ting, thud, tap, clang, thud!"
In simple words: Hard materials like metal and glass ring loudly, while soft items like cloth and wood make quiet, dull sounds.

Exam Tip: Use onomatopoeic words (sound words) like "ting" or "thud" to make your answers descriptive.

Question 14. List five objects and pair them with a material that is not suitable for it! Explain why these materials will not work to make these objects. One example is done for you.
Answer: Here is a list of objects matched with wrong materials:

In simple words: We must choose the right material for things. Glass chairs are dangerous, and cloth bottles cannot hold water.

Exam Tip: Focus on properties like "waterproof" or "stiff" to explain why a material is wrong for an object.

Question 15. Activity 6. Let's group them another way! Here are the names of some objects: ink, a stone, smoke, ice, steam, a spoon, honey, a bottle, a bag, water. If it is a solid, write its name on the tray; if it is a liquid, write its name in the bottle; if it is a gas, write its name in the balloon. Some objects could be confusing; such as sand or a sponge or clay. Identify more such objects and write names of at least three of them.
Answer: We can sort these items into three groups:
* Tray (Solids): Stone, Ice, Spoon, Bottle, Bag, Sand, Sponge, Clay.
* Bottle (Liquids): Ink, Honey, Water, Milk, Juice, Oil.
* Balloon (Gases): Smoke, Steam, Air, Helium, Carbon Dioxide.
In simple words: Hard things are solids, flowy things are liquids, and invisible or floating vapors are gases.

Exam Tip: Sand is a solid because each tiny grain is hard, even though we can pour a whole pile of it.

Question 16. List out five things in each group.
• Natural: ____________________
• Artificial: ____________________
Answer: We can group things around us based on how they are made:
* Natural Things: Trees, Rocks, Rivers, Wild Animals, Flowers.
* Artificial (Man-made) Things: Schoolbooks, Plastic Bottles, Cars, Brick Buildings, Sewn Clothes.
In simple words: Natural things come from the earth, and artificial things are made by humans in factories.

Exam Tip: Think of items from the forest (natural) and items in a city store (artificial) to make grouping easy.

Question 17. Have you seen trees around you that bear flowers and fruits at special times of the year? If you have ever eaten a ripe mango or seen mangoes in the market or watched a mango tree through the year, try to guess- at what time of the year did Khushi draw her picture? Could it be around January or around June?
Answer:
* Yes, I have seen mango trees around my home. Mangoes grow and become sweet and ripe during the hot summer, near the month of June.
* I think Khushi drew her picture around June. In January, it is too cold and the mangoes are not ready yet.
In simple words: Mangoes grow during summer, so Khushi's drawing must be of the hot month of June, not January.

Exam Tip: Relate the fruit (mangoes) to its natural growing season (summer) to find the correct month.

Question 18. Let us reflect. A. Write. Things around us are made of different types of materials. Write down the names of three materials we commonly see around us.
Answer: Three common materials we see every day are:
* Wood (from trees)
* Plastic (man-made)
* Metal (like steel or iron)
In simple words: The three most common things around us are plastic, metal, and wooden objects.

Exam Tip: Look around your classroom to quickly spot wood (desk), plastic (switches), and metal (hinges).

Question 19. Let us reflect. B. Discuss. Suppose you find a shining spoon. You don't know if it is made of metal or whether it is made of some other material and then painted with shiny paint. How would you find out?
Answer: We can test if the shiny spoon is real metal using three simple tests:
* Tap it gently with another spoon. If it makes a loud, ringing "clang" sound, it is made of metal.
* Touch it. Real metal feels very cold when you first pick it up.
* Hold a magnet near it. If the magnet sticks to the spoon, it is definitely made of metal!
In simple words: A real metal spoon will ring loudly when tapped, feel cold to touch, and stick to a magnet.

Exam Tip: Mention the "magnet test" as it is the most reliable way to identify magnetic metals like iron and steel.

Question 20. Let us reflect. C. Draw. Draw three natural and three artificial things.
Answer: Here is a neat drawing showing three green natural items and three colorful man-made items: In simple words: This picture displays natural things like a tree and fish, alongside man-made artificial items like a colorful kite and a ball.

Exam Tip: Draw clear, simple shapes so that the examiner can easily distinguish between organic living things and artificial products.

Question 21. Let us reflect. D. Do it. Match the pairs:
Transparent - A lamp shade made of paper
Translucent - A plate
Opaque - A glass used in spectacles
Answer: Here are the correct matched pairs based on how much light passes through:
* Transparent: A glass used in spectacles (it is completely clear).
* Translucent: A lamp shade made of paper (it lets only some light through).
* Opaque: A solid plate (you cannot see through it at all).
In simple words: Clear spectacle glass is transparent, blurry paper is translucent, and a solid plate is opaque.

Exam Tip: Double check that your opaque example is completely solid, and your transparent example is completely see-through.