The heads of matchsticks and the sides of a match box are deliberately made rough as:

more friction exists when two rough surfaces rub against each other

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less friction exists when two rough surfaces rub against each other

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rough surfaces catch less moisture

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the temperature of rough surfaces is always more than that of smooth surfaces

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Solution

The correct option is A more friction exists when two rough surfaces rub against each other
The heads of matchsticks and the sides of a match box are deliberately made rough to increase friction between them. As the surfaces become irregular, interlocking between them increases and hence the friction.
Due to increased friction, greater heat is produced when the matchstick is rubbed against the side of the matchbox.
Thus, the matchstick gets lighted up easily.

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