Fundamentals of Front End Development MCQs with Answers
Practice important Fundamentals of Front End Development MCQs with answers and explanations.
Chapter: 53
Q601:
What is the correct way to declare a variable in JavaScript?
A. var x
B. declare x
C. int x
D. let x
Correct Answer:
A
Chapter: 53
Q602:
What is the assignment operator in JavaScript?
A. ==
B. :=
C. =
D. ===
Correct Answer:
C
Chapter: 53
Q603:
What does the var keyword do in JavaScript?
A. Declares a function
B. Declares a variable
C. Declares a constant
D. Declares a loop
Correct Answer:
B
Chapter: 53
Q604:
How are comments written in JavaScript?
A. Using double slashes //
B. Using single quotes '
C. Using double quotes "
D. Using angle brackets <>
Correct Answer:
A
Chapter: 53
Q605:
Fill in the blank: The process of combining multiple words into one variable name using lowercase letters for the first word and capitalizing subsequent words is called ___.
A. Snake case
B. Kebab case
C. Camel case
D. Pascal case
Correct Answer:
C
Chapter: 53
Q606:
Which of the following is an example of a variable name using camel case?
A. firstName
B. FirstName
C. first_name
D. first-name
Correct Answer:
A
Chapter: 53
Q607:
What character set does JavaScript use?
A. ASCII
B. ISO-8859-1
C. Unicode
D. ANSI
Correct Answer:
C
Chapter: 53
Q608:
Which JavaScript statement will not be executed?
A. var x = 5; // will be executed
B. // var x = 6;
C. var y = 10;
D. alert('Hello');
Correct Answer:
B
Chapter: 53
Q609:
Fill in the blank: JavaScript statements are composed of values, operators, expressions, keywords, and ___.
A. Functions
B. Comments
C. Conditions
D. Loops
Correct Answer:
B
Chapter: 53
Q610:
What will the expression (5 + 6) * 10 evaluate to in JavaScript?
A. 50
B. 56
C. 110
D. 60
Correct Answer:
C
Chapter: 53
Q611:
Which of the following is a valid example of a string in JavaScript?
A. 'Hello'
B. Hello
C. 123
D. "123"
Correct Answer:
A
Chapter: 53
Q612:
What does the following JavaScript statement do: var x = 5 + 6;
A. Declares a function named x
B. Declares a variable x and assigns it the value 11
C. Checks if x is equal to 11
D. Multiplies 5 by 6
Correct Answer:
B
Chapter: 53
Q613:
Fill in the blank: In JavaScript, variable names cannot start with ___.
A. A letter
B. An underscore
C. A digit
D. A dollar sign
Correct Answer:
C
Chapter: 53
Q614:
Fill in the blank: In JavaScript, numbers can be written with or without ___.
A. Quotes
B. Decimals
C. Variables
D. Strings
Correct Answer:
B
Chapter: 53
Q615:
What is the result of the JavaScript expression var x = 10; x += 5;?
A. 5
B. 10
C. 15
D. 20
Correct Answer:
C
Chapter: 54
Q616:
What does a JavaScript statement do?
A. It defines a function
B. It defines a variable
C. It tells the browser what to do
D. It writes comments
Correct Answer:
C
Chapter: 54
Q617:
In JavaScript, how are statements separated?
A. By commas
B. By semicolons
C. By colons
D. By spaces
Correct Answer:
B
Chapter: 54
Q618:
What will the following JavaScript code do: document.getElementById("demo").innerHTML = "Hi, Everyone.";
A. Changes HTML styles
B. Changes the content of an HTML element with id="demo"
C. Deletes the HTML element
D. Creates a new element
Correct Answer:
B
Chapter: 54
Q619:
Which of the following is ignored by JavaScript?
A. Semicolons
B. Multiple spaces
C. Variable names
D. Function names
Correct Answer:
B
Chapter: 54
Q620:
When are multiple JavaScript statements on one line allowed?
A. When separated by commas
B. When separated by colons
C. When separated by semicolons
D. When separated by periods
Correct Answer:
C