Quelle heure est-il ?
Quelle = What
In the feminin form
Masculin form is "quel", but pronunciation is the same
Heure = Time, mani
Feminin word
That's why "quelle" is fem form)
Est-il = is it
The verbe to be : être
Verbe-Suject because it's a question
You can answer saying : il est 1 (une) heure.