Q1.
Did all the light objects float and all the heavy objects sink? Name the heavy objects that floated and lighter objects that sank.
Answer
No. Some heavy things floated and some light things sank.
| Heavy things that floated | Light things that sank |
|---|---|
| Empty steel bowl (katori) | A small pin |
| A big empty plastic bottle with the lid closed | An eraser |
| A wooden plank | A small marble |
So the book’s own words are right: Floating or sinking of an object cannot be decided based just on whether it is heavy or light. It also depends on other factors.
Why it happens: The empty steel bowl floats because it is hollow and holds air. A pin is light but it is solid metal packed into a very small space, so it sinks.
Check it yourself: A big ship made of iron floats, but a tiny iron nail sinks. Size and shape matter, not weight alone.