A) Hold them easily
B) Reduce their cost
C) Make them strong
D) Increase their friction
Correct Answer: D
Solution :
The roughness over a surface increases its friction. Sparks are produced when a matchstick is rubbed against the rough surface of a matchbox. This is caused by the large friction produced between the matchstick and the box. Hence, the sides of matchboxes are made rough. The correct answer is D.
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