Answer:

1. Key of G Major belongs to the sharp key family while F Major belongs to the flat family.

2. C Major or A minor

3. 1st ledger line below the treble staff

4. 2nd line

5. one flat

Explanation:

1. Key of G Major belongs to the sharp key family while F Major belongs to the flat family.

The key of G Major is the first key in the sharp family. It has one sharp which is the F#. It means that all the "F" in the musical composition will receive a sharp or will be played or sung a half step or half pitch above.

The key of F Major is the first key in the flat family. It has one flat which is the B flat. It means that all the "B" in the musical composition will receive a flat or will be played or sung a half step or half pitch below.

2. C Major or A minor

The key of C Major and A minor, the relative minor of C Major, has no sharp or flat sign. All their note pitches are not altered by any sharp of flat sign. In the keyboard or piano, all the keys of the C Major or A minor are all played in the white keys of the keyboard.

3. 1st ledger line below the treble staff

In the treble staff or G-staff, the key of C Major has its lower do located at the first ledger line below the staff.

4. 2nd line

In the treble staff or G-staff, the key of G Major has its lower do located at the second line of the staff.

5. one flat

The key of F Major is the first key in the flat family. It has one flat which is the B flat. It means that all the "B" in the musical composition will receive a flat or will be played or sung a half step or half pitch below.

F Major, G Major, C Major

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