18 Dart Language 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 way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
B.a type-system guarantee that non-nullable variables can never hold null, checked at compile time
C.a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
D.an independent worker with its own memory and event loop, used to run heavy work off the main thread
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2. Which term means: "a type-system guarantee that non-nullable variables can never hold null, checked at compile time"?
Mid
A.isolate
B.mixin
C.Future
D.sound null safety
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3. Which statement is correct?
Mid
A.sound null safety — a type-system guarantee that non-nullable variables can never hold null, checked at compile time
B.sound null safety — keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
C.sound null safety — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
D.sound null safety — an object representing a single asynchronous result that completes later with a value or an error
Answer + AI explanation with Pro
4. What is Future?
Junior
A.a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
B.an object representing a single asynchronous result that completes later with a value or an error
C.an independent worker with its own memory and event loop, used to run heavy work off the main thread
D.keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
Answer + AI explanation with Pro
5. Which term means: "an object representing a single asynchronous result that completes later with a value or an error"?
Junior
A.sound null safety
B.late keyword
C.Future
D.mixin
Answer + AI explanation with Pro
6. Which statement is correct?
Junior
A.Future — keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
B.Future — an independent worker with its own memory and event loop, used to run heavy work off the main thread
C.Future — an object representing a single asynchronous result that completes later with a value or an error
D.Future — a type-system guarantee that non-nullable variables can never hold null, checked at compile time
Answer + AI explanation with Pro
7. What is async and await?
Junior
A.a type-system guarantee that non-nullable variables can never hold null, checked at compile time
B.keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
C.an independent worker with its own memory and event loop, used to run heavy work off the main thread
D.a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
Answer + AI explanation with Pro
8. Which term means: "keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code"?
Junior
A.late keyword
B.async and await
C.mixin
D.sound null safety
Answer + AI explanation with Pro
9. Which statement is correct?
Junior
A.async and await — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
B.async and await — an independent worker with its own memory and event loop, used to run heavy work off the main thread
C.async and await — keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
D.async and await — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
Answer + AI explanation with Pro
10. What is mixin?
Mid
A.an independent worker with its own memory and event loop, used to run heavy work off the main thread
B.a type-system guarantee that non-nullable variables can never hold null, checked at compile time
C.keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
D.a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
Answer + AI explanation with Pro
11. Which term means: "a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance"?
Mid
A.sound null safety
B.async and await
C.mixin
D.isolate
Answer + AI explanation with Pro
12. Which statement is correct?
Mid
A.mixin — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
B.mixin — an object representing a single asynchronous result that completes later with a value or an error
C.mixin — a type-system guarantee that non-nullable variables can never hold null, checked at compile time
D.mixin — an independent worker with its own memory and event loop, used to run heavy work off the main thread
Answer + AI explanation with Pro
13. What is late keyword?
Mid
A.a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
B.an object representing a single asynchronous result that completes later with a value or an error
C.an independent worker with its own memory and event loop, used to run heavy work off the main thread
D.keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
Answer + AI explanation with Pro
14. Which term means: "a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization"?
Mid
A.mixin
B.Future
C.async and await
D.late keyword
Answer + AI explanation with Pro
15. Which statement is correct?
Mid
A.late keyword — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
B.late keyword — a type-system guarantee that non-nullable variables can never hold null, checked at compile time
C.late keyword — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
D.late keyword — an object representing a single asynchronous result that completes later with a value or an error
Answer + AI explanation with Pro
16. What is isolate?
Senior
A.keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
B.an independent worker with its own memory and event loop, used to run heavy work off the main thread
C.a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
D.an object representing a single asynchronous result that completes later with a value or an error
Answer + AI explanation with Pro
17. Which term means: "an independent worker with its own memory and event loop, used to run heavy work off the main thread"?
Senior
A.isolate
B.async and await
C.Future
D.late keyword
Answer + AI explanation with Pro
18. Which statement is correct?
Senior
A.isolate — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
B.isolate — an object representing a single asynchronous result that completes later with a value or an error
C.isolate — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
D.isolate — an independent worker with its own memory and event loop, used to run heavy work off the main thread
Answer + AI explanation with Pro
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