Q43 of 102 Page 77

There are two boxes, one made of metal and the other made of wood, which are similar in appearance. How will you find out which box is made of metal?

The box made of metal can be identified by striking hard on its surface. Metals are sonorous because they produce a unique sound when something hard strikes their surface. The box which is made of metal will produce a sound on striking its surface.


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41

Define (a) malleability, and (b) ductility.

 42

What is meant by saying that metals are:

(i) Malleable (ii) Ductile (iii) Lustrous and (iv) Sonorous

 44

Consider the following materials:

Copper, Sulphur, Phosphorus, Carbon (such as: pencil lead), Gold, Silver: Which of these materials are: Malleable and ductile; and brittle.

 45

Can you hold a hot metallic pan which is without a plastic or a wooden handle? Give reason for your answer.