Question

sparks are produced when a pair of scissors is sharped against the grinding wheel

Answer 1

It is due to friction and the high velocity of the grinding wheel.

Answer 2

Answer :

The given statement is true as when the scissors grinded the velocity of the grinder will clear the surface of the scissors and will make it sharp.

And, the sparks are produced because the metal is hard and the grinder is also hard having too much velocity......