Question

Differentiate among the following materials giving one example of each:
(a) Transparent and opaque materials [2 marks]
(b) Lustrous and non-lustrous materials [2 marks]

Answer 1

(a) Transparent and opaque materials

Transparent materials	Opaque materials
Materials through which one can see things on the otherside clearly are called transparent materials. [0.5 marks]	Materials through which one cannot see things on the other side are called opaque materials. [0.5 marks]
Example: Glass [0.5 marks]	Example: Wood [0.5 marks]

(b) Lustrous and non-lustrous materials

Lustrous materials	Non-lustrous materials
Lustrous materials have a shiny appearance.[0.5 marks]	Non-lustrous objects havea dullappearance.[0.5 marks]
Example: Gold [0.5 marks]	Example: Paper [0.5 marks]