A sharp in a scale

Question

lowers the note by one half step
raises the note by one whole step
raises the note by one half step
lwoers the note by one whole step

Answer 1

A sharp (♯) in music notation raises the note by one half step. Therefore, the correct answer to your statement is:

A sharp raises the note by one half step.

Conversely, a flat (♭) lowers the note by one half step.