CBSE Class 3 · Science
This World of Things
Official NCERT chapter from Our Wondrous World (book code ceev1). ExamMaster notes are original teaching at CBSE Class 3 depth.
This lesson follows the official chapter “This World of Things” in Our Wondrous World. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.
- CBSE Class 3
- Easy level
- 8 concepts
1Things we make are objects; what they are made of is material
A spoon is an object. Steel is a material. One sentence should not treat them as the same word.
“Bring the steel” when you mean the spoon mixes the two.
Figure. Point to the thing first: that is the object. Then ask what it is made of: that is the material. A spoon is not steel, and steel is not a spoon.
How it works
- Point to the thingThe object.
- Ask what it is made ofThe material.
- Say both wordsSpoon of steel.
3A property you can test: hard, shiny, bends, soaks
Hard, shiny, bends, soaks are tests you can run on the object. A story about a factory is not a property-test.
Pick one test at a time.
Figure. A property is a test you can run on the object: press, look, bend, or drip. Run one test at a time. A factory story is not a property.
How it works
- Pick one property-wordHard, or soaks.
- Run itPress, look, bend, or drip water.
- Record pass or failThat is the property.
4Where a thing comes from is a source, not a magic
Clay from a pit, steel from a process, wood from a tree. Source is a place-or-process word, not “it appeared”.
You do not need the full factory tale at this class. You need “not magic”.
Figure. A source is a place or a process, not magic. Clay comes from a pit; wood comes from a tree. The pot and the spoon are made later.
How it works
- Ask where this kind comes fromA rough source.
- Refuse “it was always a spoon”Objects are made.
- Keep the source humblePit, tree, shop — a pointer.
5Sort by material, then by use
First pile: all metal. Then split: spoons versus keys. Material first stops you mixing a wooden spoon into the metal pile because both are “spoons”.
Use-only sorts hide the material.
Figure. Sort by material first, then by use. Metal spoons stay with metal keys. A wooden spoon does not join the metal pile just because it is also a spoon.
How it works
- Sort materialMetal, wood, cloth, clay…
- Then sort useEat, wear, write…
- Two sorts, two labelsDo not mash them.
6One thing changing in a fair test
To test “does this cloth soak?”, change only the cloth or only the water time — not both plus the table colour. One change is a fairer test.
Five changes at once cannot tell you which property mattered.
Figure. A fair soak test changes only the cloth. Time and the table stay still. Changing three things at once cannot tell you which property mattered.
How it works
- Name the propertySoaks.
- Change one thingThis cloth, or this time.
- Keep the rest stillThat is the fair test.
7A miss: naming the object as if it were the material
“This is made of spoon” is a miss. The spoon is the object. Steel or wood is the material.
Swap the words and the sentence breaks.
Figure. After “made of” put a material-word. “Made of spoon” is the miss. “Made of steel” is the sentence that works.
How it works
- Hear “made of”That slot wants a material.
- Put a material-word thereSteel, wood, clay.
- Keep the object-word for the thingSpoon, plate, pot.
8The next chapter will add how things are made
This page names object, material, property, source. Making-steps (shape, dry, fire) wait next. Do not steal the potter’s steps yet.
A property-test is not a making-story.
Figure. This chapter names object, material, and a property-test. Shaping, drying, and firing wait for the next chapter. A test is not a making-story.
How it works
- Finish object vs materialTwo words.
- Finish one property-testHard or soaks.
- Leave steps of making for the next chapterShape, dry, bake.
A steel spoon and a steel plate share
- A material, not the same object
- The same use always
- No properties
Same material, two objects.
Notes
- Mapped to the official NCERT chapter “This World of Things”. Original teaching only — no textbook sentences.
- Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.
Reference tables
The object is the thing. The material is what it is made of.
| Object | Material | A property-test |
|---|---|---|
| Spoon | Steel | Hard, shiny |
| Towel | Cloth | Soaks |
| Kulhad | Clay | Holds shape when dry |
Recap
Hold these pegs from the official chapter “This World of Things”. The wording is ExamMaster’s teaching, not a textbook recap.
- Things we make are objects; what they are made of is material
- A spoon is an object. Steel is a material. One sentence should not treat them as the same word.
- A steel spoon and a steel plate share a material
- Same material, two objects, two uses. The material-test (hard, shiny, cold) can match even when the use differs.
- A property you can test: hard, shiny, bends, soaks
- Hard, shiny, bends, soaks are tests you can run on the object.
- Where a thing comes from is a source, not a magic
- Clay from a pit, steel from a process, wood from a tree.
- Sort by material, then by use
- First pile: all metal. Then split: spoons versus keys. Material first stops you mixing a wooden spoon into the metal pile because both are “spoons”.
- One thing changing in a fair test
- To test “does this cloth soak?”, change only the cloth or only the water time — not both plus the table colour.
Practise This World of Things
Reading is free and needs no account. Practice, mocks and progress live in the app.
- A 4-question practice set that ends the chapter
- 1 quick check with worked explanations
- Timed mocks scored with the real marking scheme
- Readiness tracked per topic, kept on your device