Tough Moodle Test - 76+ MCQs: Moodle test: Challenge Your Knowledge with a Comprehensive JavaScript Exam

1. Which event fires when the browser window is resized?

resize

windowResize

windowResized

onResize

2. What is the purpose of the 'Symbol' data type introduced in ES6?

To create unique identifiers

To store complex data structures

To represent strings

To handle mathematical operations

3. What is the result of the expression '5' == 5 in JavaScript?

true

false

undefined

error

4. Which statement is used to skip the rest of the current iteration in a loop?

skip

continue

pass

5. Which method returns the calling string value converted to lowercase?

toLowerCase()

toLower()

convertToLower()

lowerCase()

6. How do you round the number 7.25 to the nearest integer in JavaScript?

Math.round(7.25)

Math.floor(7.25)

round(7.25)

ceil(7.25)

7. What does the 'parseInt()' function do in JavaScript?

Parses a string and returns an integer

Returns the integer part of a number

Rounds a number to the nearest integer

Converts a number to a string

8. What is the result of the following code? ```javascript console.log(3 + '2' - 1); ```

9. Which built-in method reverses the order of the elements of an array?

reverse()

invert()

backwards()

flip()

10. How do you declare a constant variable in JavaScript?

const myVar = ;

var myVar = ;

let myVar = ;

constant myVar;

11. What is the result of the following code? ```javascript console.log(3 * '3');```

Error

12. Which event fires when an HTML element loses focus?

onblur

onfocus

onchange

onlose

13. Which method is used to add an element to the end of an array?

append()

push()

add()

insert()

14. What does the 'yield' keyword do in JavaScript?

Throws an error

Pauses a function's execution and yields its value

Terminates a function's execution

None of the above

15. Which method is used to remove the first element from an array?

shift()

remove()

delete()

pop()

16. In JavaScript, what does the 'finally' block do in a try-catch-finally statement?

Executes code after try and catch, regardless of the outcome

Executes code before try and catch

Executes code only if an error occurs

Executes code only if no error occurs

17. How do you define a function expression in JavaScript?

Using the 'function' keyword

Using an arrow function

Using a function name followed by parentheses

Using the 'def' keyword

18. What is the difference between '==' and '===' operators in JavaScript?

'==' checks for value equality, '===' checks for both value and type equality

'==' checks for value and type equality, '===' checks for value equality

'==' and '===' are identical in functionality

None of the above

19. How do you define a function in JavaScript?

function myFunction() {}

def myFunction() {}

function = myFunction() {}

create myFunction() {}

20. How do you declare a variable in JavaScript?

var myVar;

variable myVar;

let myVar = ;

myVar = ;

21. What does the 'new' keyword do in JavaScript?

Creates a new variable

Creates a new array

Creates a new function

Creates a new object instance

22. What does the 'concat()' method do in JavaScript?

Concatenates two strings

Concatenates two arrays

Concatenates an array with a string

Concatenates multiple elements into an array

23. Which method removes the last element from an array and returns that element?

pop()

remove()

delete()

splice()

24. In JavaScript, how do you initiate a loop that will continue while a condition is true?

for loop

while loop

do-while loop

if statement

25. Which JavaScript method is used to remove the last element from an array?

pop()

shift()

slice()

push()

26. In JavaScript, how do you check if an object has a specific property?

object.hasOwnProperty('property')

object.contains('property')

object.exists('property')

object.check('property')

27. Which built-in method returns the characters in a string beginning at the specified location?

substr()

slice()

getSubstring()

extract()

28. In JavaScript, which statement is used to jump out of a loop?

exit

break

return

stop

29. Which of the following methods removes the first element from an array?

shift()

unshift()

pop()

slice()

30. Which built-in method returns the index within the calling String object of the first occurrence of the specified value?

indexOf()

search()

locate()

find()

31. What does the 'map()' method do to an array in JavaScript?

Modifies the original array

Creates a new array by transforming each element

Deletes elements from the array

Sorts the array in descending order

32. What is the purpose of the 'this' keyword in JavaScript?

To refer to the current function

To refer to the global object

To refer to the parent function

To refer to the current object

33. Which operator is used to compare two values without considering their data type?

===

!==

34. What is the result of the following code? ```javascript console.log(3 + 2 + '7');```

'57'

'12'

'327'

'57undefined'

35. In JavaScript, how can you check the length of an array?

array.length()

lengthOf(array)

array.length

array.length;

36. What is the result of the expression 'typeof null' in JavaScript?

'object'

'null'

'undefined'

'string'

37. What does the '!=='' operator signify in JavaScript?

Not equal value or not equal type

Equal value and equal type

Greater than or equal

Less than or equal

38. Which symbol is used for string concatenation in JavaScript?

39. Which method is used to sort elements in an array in JavaScript?

sort()

order()

arrange()

sequence()

40. In JavaScript, how do you access the last element of an array?

array[array.length - 1]

array.last()

array[-1]

array.end()

Moodle JavaScript MCQ Test 2