12 Async and Streams questions from the Flutter bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.a source that delivers a sequence of asynchronous events over time rather than a single result
B.a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
C.a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
D.a function marked async star that yields multiple values lazily into the sequence it returns
Answer + AI explanation with Pro
2. Which term means: "a source that delivers a sequence of asynchronous events over time rather than a single result"?
Junior
A.FutureBuilder
B.Stream
C.StreamBuilder
D.async generator
Answer + AI explanation with Pro
3. Which statement is correct?
Junior
A.Stream — a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
B.Stream — a source that delivers a sequence of asynchronous events over time rather than a single result
C.Stream — a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
D.Stream — a function marked async star that yields multiple values lazily into the sequence it returns
Answer + AI explanation with Pro
4. What is FutureBuilder?
Mid
A.a source that delivers a sequence of asynchronous events over time rather than a single result
B.a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
C.a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
D.a function marked async star that yields multiple values lazily into the sequence it returns
Answer + AI explanation with Pro
5. Which term means: "a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases"?
Mid
A.StreamBuilder
B.Stream
C.FutureBuilder
D.async generator
Answer + AI explanation with Pro
6. Which statement is correct?
Mid
A.FutureBuilder — a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
B.FutureBuilder — a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
C.FutureBuilder — a function marked async star that yields multiple values lazily into the sequence it returns
D.FutureBuilder — a source that delivers a sequence of asynchronous events over time rather than a single result
Answer + AI explanation with Pro
7. What is StreamBuilder?
Mid
A.a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
B.a source that delivers a sequence of asynchronous events over time rather than a single result
C.a function marked async star that yields multiple values lazily into the sequence it returns
D.a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
Answer + AI explanation with Pro
8. Which term means: "a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time"?
Mid
A.FutureBuilder
B.Stream
C.StreamBuilder
D.async generator
Answer + AI explanation with Pro
9. Which statement is correct?
Mid
A.StreamBuilder — a source that delivers a sequence of asynchronous events over time rather than a single result
B.StreamBuilder — a function marked async star that yields multiple values lazily into the sequence it returns
C.StreamBuilder — a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
D.StreamBuilder — a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
Answer + AI explanation with Pro
10. What is async generator?
Senior
A.a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
B.a function marked async star that yields multiple values lazily into the sequence it returns
C.a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
D.a source that delivers a sequence of asynchronous events over time rather than a single result
Answer + AI explanation with Pro
11. Which term means: "a function marked async star that yields multiple values lazily into the sequence it returns"?
Senior
A.Stream
B.FutureBuilder
C.async generator
D.StreamBuilder
Answer + AI explanation with Pro
12. Which statement is correct?
Senior
A.async generator — a function marked async star that yields multiple values lazily into the sequence it returns
B.async generator — a source that delivers a sequence of asynchronous events over time rather than a single result
C.async generator — a widget that listens to a sequence of async events and rebuilds with the latest snapshot each time
D.async generator — a widget that subscribes to a single async result and rebuilds itself across its waiting, done, and error phases
Answer + AI explanation with Pro
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