Yes I think people do often think I'm intelligent, generally speaking. Sometimes they've said so. Why? Well, I've got a few brainy qualifications (physics, chemistry, mathematics, biology, English, Latin, medical laboratory science), held down a job in genetic engineering, published a couple of scientific papers, I use the extended vocabulary, I've read and understood a lot of technical info and I like to discuss it, and my home is strewn with working technical gadgets I've made myself. I suppose that's the kind of thing that people associate with high intelligence.
Personally I'm, not sure I believe in the concept of general intelligence, but I'm fairly confident in the ability of my brain to solve the kind of problems that come up in life, and I guess that's what people mean when they call me intelligent. I try to hide my executive disfunction issues and memory problems, apparently with some success.