Fundamentals of Front End Development MCQs with Answers
Practice important Fundamentals of Front End Development MCQs with answers and explanations.
Chapter: 52
Q581:
What is JavaScript primarily used for in web development?
A. Server-side programming
B. Client-side scripting
C. Database management
D. Network security
Correct Answer:
B
Chapter: 52
Q582:
Which JavaScript object can be used to work with dates and times?
A. Array
B. Date
C. Math
D. String
Correct Answer:
B
Chapter: 52
Q583:
In JavaScript, which method is used to find an HTML element by its ID?
A. querySelector()
B. getElementByClass()
C. getElementById()
D. findById()
Correct Answer:
C
Chapter: 52
Q584:
What does the innerHTML property do in JavaScript?
A. Changes the style of an element
B. Finds an element by class name
C. Sets or returns the HTML content of an element
D. Changes the image source
Correct Answer:
C
Chapter: 52
Q585:
Which attribute does the example JavaScript code change in the HTML image tag?
A. alt
B. title
C. class
D. src
Correct Answer:
D
Chapter: 52
Q586:
What will the JavaScript function changeImage() do when executed?
A. Change the image size
B. Toggle the image source between two states
C. Change the background color
D. Display an alert
Correct Answer:
B
Chapter: 52
Q587:
In the provided JavaScript function myFunction(), what will happen if the input value is less than 1?
A. "Input OK" will be displayed
B. The background color will change
C. "Input not valid" will be displayed
D. An alert box will pop up
Correct Answer:
C
Chapter: 52
Q588:
What does the isNaN function check in JavaScript?
A. If a value is a string
B. If a value is a number
C. If a value is not a number
D. If a value is undefined
Correct Answer:
C
Chapter: 52
Q589:
Fill in the blank: The JavaScript method used to change the content of an HTML element is ___.
A. innerText
B. innerHTML
C. getElementById()
D. setAttribute()
Correct Answer:
B
Chapter: 52
Q590:
Which event is used in the example to trigger the JavaScript function when a button is clicked?
A. onmouseover
B. onsubmit
C. onclick
D. onchange
Correct Answer:
C
Chapter: 52
Q591:
What will happen when the button in the provided JavaScript code is clicked?
A. The page will reload
B. The current date and time will be displayed
C. The button color will change
D. A new image will be displayed
Correct Answer:
B
Chapter: 52
Q592:
Fill in the blank: The function document.getElementById('demo').innerHTML = Date(); will display ___.
A. The current URL
B. The current date and time
C. The user’s name
D. The browser version
Correct Answer:
B
Chapter: 52
Q593:
Which keyword is used to define a function in JavaScript?
A. define
B. function
C. method
D. create
Correct Answer:
B
Chapter: 52
Q594:
In JavaScript, which property is used to change the image source in the provided example?
A. src
B. href
C. id
D. alt
Correct Answer:
A
Chapter: 52
Q595:
What type of control structure is used in the function myFunction() to evaluate the input value?
A. Loop
B. Conditional (if-else)
C. Switch
D. Object
Correct Answer:
B
Chapter: 52
Q596:
Fill in the blank: To display a message based on input validation, JavaScript uses the ___ property.
A. innerText
B. value
C. innerHTML
D. textContent
Correct Answer:
C
Chapter: 52
Q597:
What is the purpose of the onclick attribute in the provided HTML button tag?
A. To change the button text
B. To trigger a JavaScript function
C. To change the button color
D. To submit a form
Correct Answer:
B
Chapter: 53
Q598:
What separates JavaScript statements?
A. Colon
B. Semicolon
C. Comma
D. Period
Correct Answer:
B
Chapter: 53
Q599:
Which of the following is a fixed value in JavaScript?
A. Variable
B. Literal
C. Function
D. Object
Correct Answer:
B
Chapter: 53
Q600:
In JavaScript, how are string literals written?
A. Within square brackets
B. Within parentheses
C. Within double or single quotes
D. Without any quotes
Correct Answer:
C