Super Dart Test - 62+ MCQs: Dart test: Assess Your Dart Programming Knowledge with Challenging Questions and Answers

1. What is the purpose of the 'new' keyword in Dart?

Creating instances of classes

Defining constants

Handling exceptions

Accessing class members

2. What is the purpose of the 'finally' block in a try-catch statement in Dart?

Defining constants

Handling exceptions

Executing code regardless of exceptions

Creating objects

3. What is the purpose of the 'cascade' operator ('..') in Dart?

Performing arithmetic operations

Chaining method calls

Accessing class variables

Defining constants

4. What is the main purpose of the 'async' and 'await' keywords in Dart?

To handle asynchronous operations and improve code readability

To declare variables with asynchronous behavior

To create multi-threaded applications in Dart

To define generic types in Dart programming

5. Explain the concept of mixins in Dart.

A way to reuse a class's code in multiple class hierarchies

A technique for optimizing Dart code execution

A type of loop construct in Dart programming

A mechanism for handling exceptions in Dart

6. What is the purpose of the 'sync*' function in Dart?

Handling exceptions

Managing asynchronous operations

Defining constants

Implementing synchronous generators

7. What is the purpose of the 'with' keyword in Dart?

Implementing mixins

Creating objects

Defining constants

Handling exceptions

8. What is the purpose of the 'Future' class in Dart?

To represent a value or error that might be available in the future

To define constants in Dart programming

To create parallel execution in Dart applications

To handle UI interactions in Dart

9. What is the purpose of the 'const constructor' in Dart?

Creating constant variables

Defining constants

Handling exceptions

Accessing class members

10. In Dart, what is the 'call' constructor used for?

Handling exceptions

Defining constants

Implementing function invocation

Creating objects

11. What is the purpose of the 'onTimeout' method in Dart's 'Future' class?

Handling exceptions

Managing asynchronous operations

Defining constants

Specifying actions when a future times out

12. In Dart, what is the purpose of the 'is' keyword?

Defining variables

Checking the type of an object

Creating loops

Importing libraries

13. In Dart, how do you define an abstract class?

Using 'abstract' keyword before the class declaration

Using 'interface' keyword before the class declaration

Adding 'abstract' keyword to the class constructor

Including 'final' keyword in the class body

14. What is the purpose of the 'break' statement in Dart?

Terminating a loop

Exiting a function

Handling exceptions

Creating objects

15. How is a Dart set different from a Dart map?

Set can have only keys, map has key-value pairs

Set is immutable, map is mutable

Set is ordered, map is unordered

Set can have duplicate elements, map cannot

16. In Dart, how do you perform conditional property access safely?

Using 'try-catch' blocks

Using '?. operator'

Using 'else' statements

Using 'unsafe' keyword

17. Which Dart keyword is used to implement inheritance?

extends

implements

inherits

inheritsFrom

18. In Dart, what is the purpose of the 'zoneCallback' function?

Handling exceptions

Managing asynchronous operations

Defining constants

Creating objects

19. What is the purpose of the 'late' keyword in Dart?

Deferring variable initialization

Creating constants

Handling exceptions

Accessing class members

20. What is the primary use of the 'print' function in Dart?

To output text to the console

To declare variables in Dart

To create loops in Dart programming

To handle exceptions in Dart

21. What is the purpose of the 'const' keyword in Dart?

Defining constant variables

Creating classes

Handling exceptions

Accessing class members

22. What is the purpose of the 'match' expression in Dart?

Defining constants

Handling exceptions

Implementing pattern matching

Creating objects

23. How is error handling typically done in Dart?

Using try-catch blocks

Using if-else statements

Using switch-case statements

Using assert statements

24. In Dart, what is the difference between 'is' and 'as' when working with types?

They are interchangeable

'is' checks type, 'as' casts to a type

'as' checks type, 'is' casts to a type

'is' and 'as' are used for entirely different purposes

25. How do you declare a variable in Dart?

var variableName;

int variableName;

variable variableName;

declare variableName;

26. Which Dart loop is used for iterating over elements of a collection?

for-in

while

do-while

for-each

27. What is the purpose of the 'async' keyword in Dart?

Define asynchronous functions

Declare constants

Create static methods

Specify variable types

28. Which Dart feature is used for handling asynchronous programming?

Promises

Generics

Mixins

Futures

29. In Dart, what is the 'call()' method used for?

Handling exceptions

Defining constants

Implementing function invocation

Creating objects

30. In Dart, how do you define a constant constructor for a class?

Using 'const' keyword before the constructor

Using 'static' keyword before the constructor

Adding 'final' keyword to the constructor parameters

Including 'const' keyword in the constructor body

31. In Dart, how do you perform a conditional import?

Using 'if' statements

Using 'else' statements

Using 'import if' syntax

Using 'deferred' keyword

32. What is the purpose of the 'extension' keyword in Dart?

Extending class functionalities

Defining constants

Creating objects

Handling exceptions

33. How does Dart handle garbage collection?

Dart uses a generational garbage collector for automatic memory management

Dart relies on manual memory management by the programmer

Dart does not support garbage collection

Dart uses reference counting for memory cleanup

34. What is the purpose of the 'rethrow' expression in Dart?

Creating objects

Handling exceptions

Re-throwing the current exception

Defining constants

35. What is the purpose of the 'assert' keyword in Dart?

Creating objects

Checking conditions at runtime

Defining constants

Handling exceptions

36. In Dart, what is the 'main()' function used for?

Handling exceptions

Starting the execution of the program

Defining classes

Printing output to the console

37. In Dart, how do you handle asynchronous errors in a 'Future'?

Using 'try-catch' blocks

Using 'onError' handlers

Using 'finally' blocks

Using 'catchError' methods

38. What is the purpose of the 'never' type in Dart?

Defining variables

Handling exceptions

Denoting functions that never return

Creating objects

39. What is the difference between 'var' and 'dynamic' in Dart?

They are interchangeable

Var is used for static typing, dynamic for dynamic typing

Dynamic is used for static typing, var for dynamic typing

They both represent constants

40. What is the purpose of the 'if' statement in Dart?

To conditionally execute code based on a boolean expression

To create a loop in Dart programming

To declare a function in Dart

To handle asynchronous operations in Dart

41. How is the 'noSuchMethod' method used in Dart?

Handling exceptions

Defining constants

Implementing dynamic method invocation

Creating objects

42. What is the purpose of the 'rethrow' keyword in Dart?

Creating objects

Handling exceptions

Re-throwing the current exception

Defining constants

43. Which keyword is used to define a constant variable in Dart?

final

const

static

var

44. Which collection type in Dart does not allow duplicate elements?

List

Set

Map

Queue

45. What is the purpose of the 'spread' operator ('...') in Dart?

Handling exceptions

Defining constants

Creating objects

Flattening iterable elements

46. In Dart, how do you import a library?

using

import

include

require

47. Which Dart data type is used for representing integers?

int

integer

number

numeric

48. What is the purpose of the 'factory constructor' in Dart?

Creating constant variables

Defining constants

Handling exceptions

Creating objects based on specific conditions

49. What is the purpose of the 'mixin' keyword in Dart?

Defining variables

Implementing multiple inheritances

Creating instances of classes

Handling exceptions

50. What is the purpose of the 'assert' statement in Dart?

To ensure that a given expression is true during development and testing

To define constants in Dart programming

To create conditional statements in Dart

To handle exceptions in Dart applications

Dart MCQ Test 1