I don't mean to sound arrogant in any way but just to let you know these questions are way too easy. It's usually better to ask more open ended questions instead of it sounding like a quiz on JavaScript fundamentals
That's what the "Concepts" section is for. Those questions are designed so that you can keep going deeper for people that know the concept. At some point everyone bottoms out, but it's a different point for everyone. Eg.
"What is the event loop?"
"It's how JS does async"
"How does it work?"
"There's a stack and a queue managed by the platform"
"How else could you design that?"
"Other languages have threads"
"What are the tradeoffs between evented I/O and threads?"
"Memory safety and programmer error, CPU/memory utilization"
...