In a C Major scale (C,D,E,F,G,B,A) , If I were to play it over a piano, will it be right if I play C1,D5,E1,F1,G1,A1,B1 - simply put for a scale can I play keys as per names but with different pitches. If not why? The reason why I asked this question is if I were to detect my tone using an application and then improve my vocals and tune with an instrument, how will I surely know whether the note I sang was right when compared to its previous note and if I was singing proper scale?
Chances are, unless you're a trained singer, if you did that, you'd probably sing an ordinary scale. If indeed, you could play exactly what you wrote!
Jumping up a whole octave or more is not what most songs do, so it would feel alien to you. Your voice would probably compensate by doing what I described at the start.
So, how would you know? By recording the event and playing it back and listening. Most likely with disbelief!