Yes, it's F sharp.
The key of G Major has one sharp: F#
One sharp could be G major or E minor.
G major has one sharp - F♯
G Major has one sharp, which is F sharp.
G Major or e minor. The sharp would be F sharp.
The G-major scale has only one sharp (which is F#)
The key that is located just to the right of G major on the circle of fifths and has one more sharp is D major. G major has one sharp (F#), and D major has two sharps (F# and C#).
The key of Gmajor has 1 sharp which is F sharp.
A♯, B♯, Cx (double sharp), D♯, E♯, Fx (G), Gx (A) and back to A♯.It is much simpler to use B♭ Major, which goes:B♭, C, D, E♭, F, G, A and B♭.
The key located just to the right of G major on the circle of fifths is D major. D major has two sharps, while G major has one sharp.
The key of G Major has one sharp: F#
One (f sharp)