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

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

Defining constant variables

Creating classes

Handling exceptions

Accessing class members

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

final

const

static

var

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

Defining constants

Handling exceptions

Implementing pattern matching

Creating objects

4. 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

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

Handling exceptions

Starting the execution of the program

Defining classes

Printing output to the console

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

Handling exceptions

Managing asynchronous operations

Defining constants

Creating objects

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

Defining variables

Implementing multiple inheritances

Creating instances of classes

Handling exceptions

8. 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

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

Implementing mixins

Creating objects

Defining constants

Handling exceptions

10. What is the primary use of Dart programming language?

Web development

Mobile app development

Data analysis

Game development

11. In Dart, what is the default value of an uninitialized variable?

null

undefined

false

12. 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

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

Using 'if' statements

Using 'else' statements

Using 'import if' syntax

Using 'deferred' keyword

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

using

import

include

require

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

Handling exceptions

Managing asynchronous operations

Defining constants

Implementing synchronous generators

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

int

integer

number

numeric

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

Terminating a loop

Exiting a function

Handling exceptions

Creating objects

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

Handling exceptions

Defining constants

Creating objects

Flattening iterable elements

19. Which Dart concept is used for managing code execution in parallel?

Isolates

Threads

Futures

Promises

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

Performing arithmetic operations

Chaining method calls

Accessing class variables

Defining constants

21. How is error handling typically done in Dart?

Using try-catch blocks

Using if-else statements

Using switch-case statements

Using assert statements

22. What is the purpose of the 'Sync' in Dart's 'Future.sync'?

Handling exceptions

Managing asynchronous operations

Defining constants

Ensuring synchronous execution of the future

23. 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

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

Define asynchronous functions

Declare constants

Create static methods

Specify variable types

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

Promises

Generics

Mixins

Futures

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

Extending class functionalities

Defining constants

Creating objects

Handling exceptions

27. 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

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

Using 'try-catch' blocks

Using 'onError' handlers

Using 'finally' blocks

Using 'catchError' methods

29. 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

30. 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

31. In Dart, how do you declare a multi-line string?

multi('...')

multiline('...')

'''...'''

string('...')

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

Creating constant variables

Defining constants

Handling exceptions

Creating objects based on specific conditions

33. How do you declare a variable in Dart?

var variableName;

int variableName;

variable variableName;

declare variableName;

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

Deferring variable initialization

Creating constants

Handling exceptions

Accessing class members

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

List

Set

Map

Queue

36. 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

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

Handling exceptions

Defining constants

Implementing function invocation

Creating objects

38. 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

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

Handling exceptions

Defining constants

Implementing dynamic method invocation

Creating objects

40. 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

Dart MCQ Test 2