Can a hot-wire ammeter be used to measure a direct current having a constant value? Do we have to change the graduation?

Hot wire ammeters are used for measuring

Can we use galvanometer to measure alternating current ?

Can a galvanometer as such be used for measuring the current? Explain.

A dc ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the dc ammeter shows 6 A. When ac current flows through circuit, the ac ammeter shows 8A. What will be reading of each ammeter if dc and ac current flow simulataneously through the circuit?

Can a quantity have constant value and be dimensionless ?