Multiple choice

Which of the following materials are non-lustrous?

  1. Iron and copper

  2. Diamond and silver

  3. Wood and coal

  4. Glass and steel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lustrous means shiny. Iron, copper and silver are metals and all metals have shiny surface. Diamond, glass and steel are also shiny. Wood and coal are the substances which appear dull and non lustrous. 

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