1 $Which keyword is used to define a function in JavaScript?$

A.

func

B.

def

C.

function

D.

method

2 $What is the correct syntax to call a function named 'myFunction'?$

A.

call myFunction()

B.

myFunction()

C.

call function myFunction()

D.

myFunction

3 $Which statement is used to return a value from a JavaScript function?$

A.

send

B.

value

C.

return

D.

output

4 $If a function is called with fewer arguments than declared parameters, what value are the missing parameters assigned?$

A.

null

B.

C.

undefined

D.

false

5 $Which built-in object within a function contains an array-like list of all arguments passed to that function?$

A.

parameters

B.

args

C.

arguments

D.

list

6 $What happens when a return statement is executed inside a function?$

A.

The function restarts

B.

The function stops executing immediately

C.

The function continues until the last line

D.

The function prints the value

7 $Which event occurs when the user clicks on an HTML element?$

A.

onchange

B.

onmouseclick

C.

onclick

D.

onmouseover

8 $Which event is triggered when the mouse pointer moves over an element?$

A.

onhover

B.

onmouseover

C.

onmouseenter

D.

onmove

9 $Which event is triggered when the mouse pointer moves out of an element?$

A.

onmouseout

B.

onmouseleave

C.

onexit

D.

onmouseoff

10 $Which event handler is used to execute code when a user submits a form?$

A.

onclick

B.

onexecute

C.

onsubmit

D.

onsend

11 $In form validation, what should the 'onsubmit' event handler return to prevent the form from submitting?$

A.

true

B.

null

C.

false

D.

12 $Which event fires when an input field loses focus?$

A.

onfocus

B.

onblur

C.

onchange

D.

onstop

13 $Which event fires immediately when an input field gets focus?$

A.

onfocus

B.

onblur

C.

onselect

D.

onclick

14 $Which event is triggered when the content of a form element, the selection, or the checked state have changed?$

A.

oninput

B.

onmodify

C.

onchange

D.

onblur

15 $Which event occurs when the user presses a key on the keyboard?$

A.

onkeypress

B.

onkeydown

C.

onkeyup

D.

All of the above

16 $Which property of the event object returns the Unicode character code of the key that triggered the onkeypress event?$

A.

keyChar

B.

unicode

C.

keyCode

D.

keyType

17 $Which event is triggered when a user releases a key?$

A.

onkeydown

B.

onkeypress

C.

onkeyup

D.

onkeyrelease

18 $How can you access the value of an input field with id='email' in JavaScript?$

A.

document.getElementById('email').text

B.

document.getElementById('email').value

C.

document.getElementById('email').content

D.

document.getElement('email').value

19 $Which function is commonly used to check if a value is not a number during validation?$

A.

isNumber()

B.

isNaN()

C.

checkNumber()

D.

validateNumber()

20 $To set the focus to a specific element in validation, which method is used?$

A.

element.focus()

B.

element.select()

C.

element.highlight()

D.

element.active()

21 $What is the 'this' keyword usually referring to inside an HTML event attribute (e.g., onclick='func(this)')?$

A.

The window object

B.

The document object

C.

The element itself

D.

The function

22 $Which event occurs when a user double-clicks on an element?$

A.

onclick2

B.

ondoubleclick

C.

ondblclick

D.

on2click

23 $Which event occurs when a web page has finished loading?$

A.

onstart

B.

onload

C.

onready

D.

onfinish

24 $Which event is triggered when text is selected in an input or textarea?$

A.

onhighlight

B.

onchoose

C.

onselect

D.

onmark

25 $Which method is used to test if a string matches a regular expression pattern?$

A.

check()

B.

validate()

C.

test()

D.

verify()

26 $When validating an email, which logic is best to check for the presence of '@'?$

A.

email.length > 0

B.

email.indexOf('@') > -1

C.

email.value == '@'

D.

email.contains('@')

27 $What is the correct way to access a form named 'loginForm' via the document object?$

A.

document.loginForm

B.

document.forms['loginForm']

C.

Both A and B

D.

document.getForm('loginForm')

28 $Which property indicates the number of characters in a string value of an input field?$

A.

size

B.

count

C.

length

D.

width

29 $Which event handler is best suited for validating a field immediately after the user leaves it?$

A.

onmouseover

B.

onblur

C.

onfocus

D.

onload

30 $What is the purpose of 'event.preventDefault()'?$

A.

To stop the event from bubbling

B.

To prevent the default action of the element

C.

To stop the script

D.

To refresh the page

31 $Which event is triggered when a form is reset?$

A.

onclear

B.

onreset

C.

onempty

D.

ondelete

32 $How do you check if a checkbox with id='agree' is checked?$

A.

document.getElementById('agree').value == 'on'

B.

document.getElementById('agree').checked == true

C.

document.getElementById('agree').selected

D.

document.getElementById('agree').on

33 $Can a JavaScript function return another function?$

A.

No, never

B.

Yes, this is called a closure or higher-order function

C.

Only in strict mode

D.

Only if it returns a string

34 $Which mouse event is fired when a mouse button is pressed down (before releasing)?$

A.

onmouseup

B.

onclick

C.

onmousedown

D.

onmousepress

35 $To validate that a password is at least 8 characters long, which condition is used?$

A.

password.value.size >= 8

B.

password.value.length >= 8

C.

password.length >= 8

D.

password.val.len >= 8

36 $What defines the scope of a variable declared with 'var' inside a function?$

A.

Global scope

B.

Function scope

C.

Block scope

D.

Document scope

37 $Which of the following is an anonymous function?$

A.

function myFunc() {}

B.

var myFunc = function() {}

C.

function() {}

D.

Both B and C

38 $Which regex syntax is used to create a Regular Expression object?$

A.

/pattern/flags

B.

new RegExp('pattern', 'flags')

C.

Both A and B

D.

RegExp(/pattern/)

39 $In a dropdown list (select tag), how do you get the index of the selected option?$

A.

element.value

B.

element.selectedIndex

C.

element.optionIndex

D.

element.choice

40 $What is the default return value of a function that does not have a return statement?$

A.

null

B.

C.

undefined

D.

void

41 $Which event is commonly used to detect if a user is typing inside a text box?$

A.

onselect

B.

onkeyup

C.

onclick

D.

onload

42 $How can you stop a function execution if a validation error occurs?$

A.

break

B.

stop

C.

return false

D.

exit

43 $Which JavaScript function displays a dialog box with a message and an OK button?$

A.

prompt()

B.

confirm()

C.

alert()

D.

msg()

44 $To check if a radio button is selected, which property do we check?$

A.

selected

B.

toggled

C.

checked

D.

active

45 $When handling the 'onkeypress' event, how can you allow only numbers to be entered?$

A.

Check if event.keyCode is between 48 and 57

B.

Check if event.key is 'Number'

C.

Use type='text'

D.

Disable the keyboard

46 $Which is the correct syntax to bind an event handler in HTML?$

A.

<button event='myFunc()'>

B.

<button onclick='myFunc()'>

C.

<button click='myFunc()'>

D.

<button do='myFunc()'>

47 $What is passed to the event handler function if defined as 'element.onclick = myFunction;'?$

A.

Nothing

B.

The Event object

C.

The element

D.

The document

48 $Which function converts a string argument to an integer?$

A.

toInteger()

B.

parseInt()

C.

Float()

D.

NumberString()

49 $In validation, if a field is empty, what does 'field.value' equal?$

A.

null

B.

undefined

C.

"" (empty string)

D.

50 $What is the order of mouse events when clicking a button?$

A.

onclick -> onmousedown -> onmouseup

B.

onmousedown -> onmouseup -> onclick

C.

onmouseup -> onmousedown -> onclick

D.

onclick -> onmouseup -> onmousedown

Unit 5 - Practice Quiz