Grouping on Basis of Lusturous


 
 
Concept Explanation
 

Grouping on Basis of Lusturous

Lustre :  lustre is the shine of the material. All metals in pure state are shiny and said to posses lustre. This property of metals is widely used for making jewellery and other decorative articles. Example are gold, silver and bronze.

Example : 

A metal spoon shines whereas a wooden spon does not shine so much. Silk cloth has a shine whereas wollen cloth does not. We say that meal  has more lustre than wood and that silk has more lustre than wool. An iron rod may not appear lustrous but when you use the sand paper to remove the top layer of the metal than you will see the lustre.Some metals lose their lustre when exposed to air and moisture. 

Sample Questions
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Question : 1

Which of the following does not belong to the group of shiny materials?

Right Option : D
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Question : 2

Which of the following does not have lustre?

Right Option : B
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Question : 3

Which of the following are correct :

(a) Due to lustrous property of metals is widely used for making jewellery

(b) Gold, silver and bronze are lustrous in nature.

Right Option : C
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