Class 3 | Evs | Ch. 10 This World of Things Solutions
Page 123
Q. 1. Can you name the things that Khushi has drawn? Write in the boxes given.
Ans.
Yes, I can name the things that Khushi has drawn.
Q. 2. Do you see the window glass? Why or why not?
Ans. In the given picture, I cannot see the window glass but can see the outside view. Because window glass is made up of transparent material.
Activity 1 (Page 124)
Understand Your Classroom
Draw a picture of your classroom in your notebook. Label the things that you have drawn.
Ans.
Do it yourself.
Activity 2 (Page 125)
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.
Ans.
Do it yourself (Two examples have been done for you)
Find Out (Page 125)
Q. 1. What are other things in the classroom, such as, mats, bulbs and electric switches, made of?
Ans. In the classroom, other things such as mats is made up of cotton, bulbs is made up of glass and electric switches are made of plastic and metals respectively.
Q. 2.Does your window have a glass pane?
Ans. Yes, It is.
Q. 3. Can you see through it?
Ans. Yes, I can.
Q. 4. What do you see?
Ans. Do it yourself.
Activity 3 (Page 126)
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.
Ans.
Some blanks are filled for you rest of them do it yourself.
Transparent Things: Materials through which we can see are called Transparent. For example glass, glass pane, spectacles etc.
Opaque : Materials through which we cannot see are called opaque. Glass is transparent but wood is Opaque.
Translucent : Materials through which we can see only partially are called translucent. Butter paper, oily paper are translucent
Activity 4 (Page 127)
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.
Q. 1. Does the colour of the paper appear to change?
Ans. Yes, the colour of the paper appears to change.
Q. 2. Does white paper appear different when you look at it through thin blue plastic or glass? Or, thin yellow plastic or glass?
Ans. Yes, the white paper appears blue when seen through thin blue plastic or glass. Similarly, the white paper appears yellow if we look through thin yellow plastic or glass.
Q. 3. Do the colours of different objects appear to change? How did a blue object look through thin yellow plastic?
Ans. Yes, the colours of different objects appear to change.
A blue object is looked black through a thin yellow plastic.
Q. 4. Have you earlier experienced looking through coloured transparent objects? Try to recall such experiences.
Ans. No,
Do it yourself.
Write (Page 128)
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.
Where do all these materials come from? Can you locate their source?
For example, Wood – Tree
Metals – __________
Cloth – __________
Answer:
The source of the given materials is as follows:
Wood — Tree and plants
Metals — Earth, Rocks, Metal
Cloth — Plants, Animals, Chemicals
Glass – glass is mostly made of Sand
Find Out (Page 129)
Talk to your Grandparents
Q. In their childhood, were these things made of the same materials?
Ans. Yes, but now it is also made up of plastic material.
Q. Are there new materials now that they might not have seen before?
Ans. Yes, plastic material.
Q. Are there any materials they saw in their childhood that are not in use now? Why?
Ans. Yes, material cork is used as the lid of bottle and jars.
Page 129
Q. 1. Different materials may look different. Are they also different in other ways? Would you be able to recognise some material even with your eyes closed?
Ans. Yes, materials can differ in various ways, not just how they look. For example, texture, weight, etc. Children can try themselves and identify different materials.
Find Out (Page 129)
Q. 1. What material is your spoon made of?
Ans. My spoon is made up of steel.
Q. 2. Is it made of metal, wood or some other material? Can you guess?
Ans. Yes, it may be of metal, wood, plastic or some other material? But Steel is a most common metal.
Q. 3. Which of these words or phrases describes the spoon?
Activity 5 (Page 130)
Knock on it and it will speak to you!
Orchestra
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.
Ans.
Do it yourself.
Write (Pages 130-131)
Odd Pairs
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.
| S.No. | Objects | Material | Reasons |
| 1. | Umbrella | Paper | The paper will tear if it gets wet in the rain. |
| 2. | Toothbrush Bristles | Metal | Metal bristles will harm our delicate gums. |
| 3. | Car Tyre | Glass | The glass would shatter under the weight. |
| 4. | Raincoat | Cloth | We will get wet in the rain. |
| 5. | Bottle Opener | Rubber | The rubber opener will not be able to open the bottle. |
Activity 6 (Page 132)
Solid liquid and gas
1. Solid
★ Solids have a fixed shape and size.
★ They are hard and do not flow.
★ solids does not bend.
Examples: Table, chair, book, pen, pencil, stone
2. Liquid
★ Liquids do not have a fixed shape.
★ They take the shape of the container.
★ Liquids can flow.
Examples: Water, milk, juice, oil, honey
3. Gas
★ Gases do not have a fixed shape or size.
★ They spread everywhere.
★ We cannot see most gases.
Examples: Smoke, Air, oxygen, steam
Q. 1. 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, and water.
If it is a solid, write its name on the tray; if it is a liquid, write it in the bottle; if it is a gas, write it in the balloon.
Add some of your objects in the tray, bottle, and balloon.
Ans.
Q. 2. Some objects could be confusing, such as sand sponge, or clay. Identify more such objects and write the names of at least three of them.
Ans. Cotton candy, silica gel, and pumice stone.
Page 133
Natural – Artificial
Khushi drew a picture of a mango tree with a mango growing on it and a bird sitting on it. The tree, mango, and bird are not made by humans but occur naturally in nature.
List out five things in each group.
- Natural: ______________
- Artificial: ______________
Ans.
- Natural: Apple, Carrot, Mango, Spinach, Water
- Artificial: Potato chips, Candy bar, Soda(carbonated drink), Chicken nuggets, Ice cream
Find Out (Page 133)
Q. 1. 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?
Ans.
Trees with flowers and ripe mango fruit can be seen during the monsoon season. Therefore, Khushi must have drawn this picture in the month around June.
Let us reflect (Page 134)
A. Write
Things around us are made of different types of materials. Write down the names of three materials we commonly see around us.
_____________________________________________
Ans.
Things around us are made of wood, metal, plastic, cloth, glass, etc.
Things around us are made up of Transparent, Translucent and Opaque materials.
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?
Ans.
By performing the magnet test, we can see if the spoon is attracted to the magnet, it is likely made of metal. We can also determine whether the spoon is made of metal or another material coated with shiny paint by a sound test. Metals generally produce a clear, ringing sound, whereas non-metallic materials often produce a dull sound.
C. Draw
Draw three natural and three artificial things.
Do it yourself.
D. Do it.
Match the pairs.
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