What happens if you pass an empty string ("") to the alert() function?

B) It displays a blank alert dialog.

What does the alert() function do in JavaScript?

B) Displays a message in an alert dialog box.

What is an event in JavaScript?

C) Action that happens in the system, such as a user clicking a button.

How does the alert() function affect the execution of JavaScript code?

A) Pauses the execution until the user dismisses the alert dialog.

What is JavaScript primarily used for in web development?

B) Creating interactive elements and dynamic content

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JS Quiz

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Questions 15

Answers

1
Which of the following is a valid use of the alert() function?
C) alert(confirm("Are you sure?"))
D). All of the above
A) alert("Hello, world!")
B). alert(prompt("Enter your name:"))
2
What happens if you pass an empty string ("") to the alert() function?
D) It has no effect.
B) It displays a blank alert dialog.
C) It displays an alert dialog with "undefined"
A) It throws an error.
3
Which property can be used to determine the type of event that occurred?
C) event.stopPropagation()
D) event.preventDefault()
B) event.target
A) event.type
4
Which of the following browsers supports the alert() function?
D) All of the above
C) Internet Explorer
B) Mozilla Firefox
A) Google Chrome
5
What does the alert() function do in JavaScript?
C) Prompts the user for input.
D) Prints a message to the browser's developer console
B) Displays a message in an alert dialog box.
A) Displays a message in the console.
6
Which of the following is NOT an example of a DOM event?
D) run
A) click
C) change
B) hover
7
Which event type is triggered when the user presses a key?
A) Keydown
B) Click
C) mousehover
D) Change
8
Which of the following is NOT a primitive data type in JavaScript?
C) array
D) boolean
B) string
A) number
9
Which of the following is a valid way to dismiss an alert() dialog in JavaScript?
B) Clicking anywhere outside the dialog
D) All of the above
C) Clicking the OK button
A) Pressing the Escape key (Esc)
10
What is an event in JavaScript?
D) A variable declaration.
C) Action that happens in the system, such as a user clicking a button.
A) A function definition.
B) A method call.
11
What type of input does the alert() function accept?
D) Array
A) Number
C) Boolean
B) String
12
How does the alert() function affect the execution of JavaScript code?
C) Halts the execution permanently.
A) Pauses the execution until the user dismisses the alert dialog.
D) Only executes if used within a loop.
B) Continues the execution without interruption.
13
What is JavaScript primarily used for in web development?
D) Creating database structures
B) Creating interactive elements and dynamic content
A) Styling web pages
C) Managing server-side logic
14
Which event type is triggered when the user scrolls a webpage?
A) scroll
D) drag
B) mousemove
C) wheel
15
Which of the following methods can be used as an alternative to alert() for displaying messages?
D) window.open()
C) confirm()
A) prompt()
B) console.log()

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