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?
To find out if a shining spoon is made of metal or painted with shiny paint, I would use two simple tests.
First, I would tap it gently and listen to the sound. Metal makes a clear ringing sound like 'ting-ting' when tapped, while other materials make dull sounds like 'dhum-dhum'.
I would also feel the spoon — metals feel cold to the touch and are smooth and shiny naturally. Painted materials may feel different and the paint could scratch off to reveal another material underneath.
Explanation
The chapter in Activity 5 'Knock on it and it will speak to you!' explains that different materials make different sounds when tapped. Metal makes distinctive sounds. The chapter also discusses properties like smoothness, shininess, and feeling cold to touch as characteristics of metals. These properties help distinguish metals from other materials that might be painted to look shiny.
Solution Steps
Tap the spoon gently and listen to the sound it produces
Metal makes a clear ringing sound ('ting-ting'), while other materials make dull sounds ('dhum-dhum')
Feel the spoon — metals feel cold to touch and are naturally smooth and shiny
Check if paint scratches off to reveal another material underneath