Question

fused NaCl on electrolysis gives what on cathode

Answer 1

Na+ is discharged at the cathode during electrolysis of NaCl

Answer 2

Well the answer of your question is "Na"
As the NaCl actually consist of Na and Cl so upon the electrolysis it gives the Na+ and Cl ions
At the cathode the reaction will be like following
Na+    +  e-  ⇒ Na 
While on the anode end the reaction will be
Cl- ⇒ Cl +  e-
The overall reaction will  be like
NaCl⇒ Na+     +   Cl-

Also, the fused NaCl is actually the molten NaCl.

Hope this will helps.