if we set j=1,k=0 in a positively triggered jk flipflop then what is the output?

 

I have moved your post to its own subject. Please do not hijack another post - start your own.

The truth table for a 74LS73 indicates the flip-flop will be set, assuming the reset input is high as well. The device's data sheet always gives that information.

 

if an async input is active, it will follow that control, if not, it will be at its previously driven state. if a valid clock has occurred, then set.