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Q.

Safety pins are commonly made of


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a

Wood and glass

b

Plastic and glass

c

Leather and plastic

d

Steel and plastic 

answer is D.

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Detailed Solution

Safety pins are commonly made up of steel and plastic.
A substance or mixture of substances that form an object is referred to as a material. Materials can be either pure or impure, living or non-living. Physical and chemical properties, as well as the geological origin and biological function, can all be used to classify materials. The sharp points in a pin are manufactured by moulding the steel and the edges can be sealed using plastic. Wood, glass, and leather are not used to make safety pins.
 
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