If you're going to ask questions, make sure you've spent some time Googling so you can ask good questions and demonstrate you've at least identified some specific options.
"I want to do X. I've thought about doing it this way and that way. I'm not sure which would be best because this part is unclear. /or/ I think this would be best because XYZ, what do you think?"
If you're just lost on where to start, ask the other dev for a point in the right direction so you could come back later with some specifics.
And then once you get your advice / answer run with it and really understand it. Dive deep to show your appreciation, and follow up with another thank you, showing off what you've learned. Any senior dev worth their salt would love that, and you'll encourage them to invest more time in you.
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