Download How Things Work – NCERT Class 4 EVS Chapter 7 PDF from the new NCERT Class 4 EVS book Our Wondrous World (2026-27). Read the chapter online or download the free PDF. Some things spin well and some do not. A coin, a bangle and a wooden top spin; an eraser does not spin properly.
How Things Work PDF – Chapter 7 of Our Wondrous World
Read the chapter online or download the PDF.
| Chapter | Download | |
|---|---|---|
| Chapter 7 PDF | How Things Work | View PDF |
| Full book | NCERT Class 4 EVS – Our Wondrous World | View Book |
Read Online
What Is in How Things Work? (Class 4 EVS Chapter 7)
- Some things spin well and some do not. A coin, a bangle and a wooden top spin; an eraser does not spin properly.
- A spinner spins best when the toothpick goes right through its centre. Then it looks the same from all sides and stays upright.
- A square spinner looks round while it is spinning, and many colours painted on a spinner mix into one colour.
- Some heavy things float and some light things sink. So floating cannot be decided by weight alone.
- Shape matters. Aluminium foil floats when it is spread out or shaped like a cup, but it sinks when it is pressed into a tight ball.
- Many things around us spin — ceiling fans, a potter’s wheel, the charkha and the lattu.
Quick revision – How Things Work
| What we tried | What we changed | What we saw | Why it happens |
|---|---|---|---|
| Coin | Spun it standing on its edge | It shakes as it slows down | It cannot stay standing when it turns slowly |
| Spinner | Toothpick at the centre | Stands upright and spins well | It looks the same from all sides |
| Spinner | Toothpick away from the centre | It wobbles and falls | Its two sides are not the same |
| Square spinner | Shape of the card | It looks round while spinning | It turns too fast for our eyes to follow |
| Coloured spinner | Painted in many colours | The colours mix into one colour | The colours move too fast for our eyes |
| Leaf | Put in water | Floats | It is light |
| Iron nail | Put in water | Sinks | It is heavy |
| Empty steel bowl | Put in water gently | Floats | It is empty and holds air inside |
| Bottle full of water, lid closed | Put in water | Sinks | It is full of water, so it is heavy |
| Aluminium foil | Spread out flat | Floats | It lies spread wide on the water |
| Aluminium foil | Pressed tightly into a ball | Sinks | All the foil is squeezed into a small space |
| Aluminium foil | Made into a cup shape | Floats | The cup holds air inside it |
Old NCERT vs New – Class 4 EVS
This chapter is from Our Wondrous World, the new NCERT Class 4 EVS book (NCF-SE 2023, used from 2025-26). It replaced the old book “Looking Around”, so chapter numbers and names differ from older PDFs.
Solutions and All Chapters
Answers to the exercises and the full chapter list of Our Wondrous World:
How Things Work – Overview
| Class | Class 4 |
| Subject | EVS |
| Book | Our Wondrous World – new NCERT book |
| Chapter | 7 of 10 – How Things Work |
| Book pages | 104 – 116 |
| Edition | NCERT Reprint 2026-27 |
| Session | 2026-27 |
| Free – read online or download |
Class 4 EVS Chapter 7 – FAQs
Where can I download How Things Work Class 4 PDF?
From the download table on this page – the chapter PDF is free, and the full book is linked too.
What is Class 4 EVS Chapter 7 about?
Some things spin well and some do not. A coin, a bangle and a wooden top spin; an eraser does not spin properly.
Is How Things Work from the new NCERT Class 4 EVS book?
Yes. It is chapter 7 of our wondrous world, the new NCERT Class 4 EVS book for 2026-27.
Is this the latest NCERT edition for 2026-27?
Yes – the PDF is NCERT’s latest edition for the 2026-27 session.
Where are the NCERT Solutions for Class 4 EVS Chapter 7?
Open the NCERT Solutions link above for answers to the exercise questions.