Class 7 Science — Chapter 4: The World of Metals and Non-metals

What you'll learn

• ▸Physical Properties: Lustre and Hardness
• ▸Malleability
• ▸Ductility
• ▸Sonority
• ▸Thermal Conductivity
• ▸Electrical Conductivity
• ▸Historical Significance of Metals

Chapter Summary

--- PAGE 1 --- 4 The World of Metals and Non-metals Yashwant and Anandi live in a village in Rajasthan. Their school has assigned them a project to learn about craftspersons who work with metals. They decide to visit the local ironsmiths who practise this craft. Yashwant and Anandi request their grandfather to accompany them (Fig. 4.1). They are curious to learn how these ironsmiths make different items of daily use. They interact with an elderly craftsperson, Sudarshan uncle. Yashwant: Which items do you generally make? Sudarshan: Generally, we make items of daily use, such as flat pans (tawas), buckets (baltis), tongs (chimtas), and farming tools like spades (phawras), axes (kulhadis), trowels (khurpis), and rakes (jelees). Anandi: What materials are they made of? 0777CH04 Fig. 4.1: Ironsmith making various items --- PAGE 2 --- Sudarshan: We use iron metal to make these items. We also use wood to prepare handles wherever required. Additionally, we use coal in our furnaces to …

Practice Questions from this Chapter

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1. Explain metal's strength simply. Get Solution →
2. List everyday uses for non-metals. Get Solution →
3. Compare metal and non-metal sounds. Get Solution →
4. What is the property by which materials can be beaten into thin sheets called? Get Solution →
5. Which metal is mentioned in the text as being in a liquid state at room temperature? Get Solution →
6. The ability of a material to be drawn into wires is known as what? Get Solution →
7. According to the text, which metal is so ductile that 1 gram can be drawn into a 2-kilometer-long wire? Get Solution →
8. What is the property of metals that enables them to produce a ringing sound called? Get Solution →

Did you know?

• 💡 Gallium metal melts when held in your hand, turning into a silvery liquid.
• 💡 The human body uses metals like iron to carry oxygen in your blood.
• 💡 Diamonds, the hardest natural substance, are actually pure carbon, a non-metal.
• 💡 Ancient Egyptians used pure gold to make death masks for pharaohs.
• 💡 Aluminum metal was once more expensive than gold because it was so hard to purify.

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