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difference between `onCreate()` and `onStart()`?",[149,151,153,155],{"key":133,"text":150},"They always run at the exact same moment, order is irrelevant.",{"key":136,"text":152},"`onStart()` runs before `onCreate()` on every launch.",{"key":139,"text":154},"`onCreate()` can be called multiple times per instance, `onStart()` only once.",{"key":142,"text":156},"`onCreate()` runs once; `onStart()` runs whenever it becomes visible.","`onCreate()` fires once (initial setup). `onStart()` fires every time the activity is about to become visible — including when returning from the background — so it can run multiple times per instance while `onCreate()` runs once.",{"id":159,"topic":57,"difficulty":129,"body":160,"options":161,"correct_key":133,"explanation":170},"019fa914-602f-74f0-b592-95c1e26924dd","What is the key practical difference between `onPause()` and `onStop()`?",[162,164,166,168],{"key":133,"text":163},"`onPause()` fires losing focus; `onStop()` once invisible.",{"key":136,"text":165},"They are two names for the exact same callback.",{"key":139,"text":167},"`onStop()` always fires before `onPause()` in every scenario.",{"key":142,"text":169},"`onPause()` only exists for fragments, never for activities.","`onPause()` runs when the activity is still partially visible but losing focus (e.g. a dialog appears on top). `onStop()` runs once the activity is no longer visible at all.",{"id":172,"topic":57,"difficulty":173,"body":174,"options":175,"correct_key":139,"explanation":184},"019fa914-6031-7cb4-95af-1b1af7eba328",2,"Is it guaranteed that `onDestroy()` will always be called before an Activity's process disappears?",[176,178,180,182],{"key":133,"text":177},"Yes, always, with no exceptions whatsoever.",{"key":136,"text":179},"No, `onDestroy()` never actually runs on real devices.",{"key":139,"text":181},"No — the system can kill the process without calling it.",{"key":142,"text":183},"Yes, but only if the user explicitly presses a back button.","`onDestroy()` is the final lifecycle callback, but it is not a hard guarantee — if the system needs to reclaim memory, it can kill the process outright without ever calling `onDestroy()`, which is why critical cleanup shouldn't rely solely on it.",{"id":186,"topic":57,"difficulty":173,"body":187,"options":188,"correct_key":139,"explanation":197},"019fa914-6032-776c-ad0c-73037ae9f904","A device is rotated while an Activity with a plain (non-ViewModel) `var count = 0` property is on screen. 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