Question

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
(a) Stone
(b) Plastic block
(c) Wooden block
(d) Glass block

Answer 1

Explanation:

Sto e is the right answer since it's the object with most friction. Things with a lot of friction heat up the object(knife) and make it sharper.

If, we rub other substances given in the question then the sword might even break the material since they all are soft and have less intermolecular

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Answer 2

Answer:

(a) Stone will be most suitable.