Fundamentals of Front End Development MCQs with Answers
Practice important Fundamentals of Front End Development MCQs with answers and explanations.
Chapter: 72
Q821:
What is the correct syntax for the `if` statement in JavaScript?
A. if (condition) { // code } else if (condition2) { // code } else { // code }
B. if (condition) { // code }
C. if (condition) { // code } else { // code }
D. if (condition) { // code } else if (condition2) { // code } else { // code }
Correct Answer:
D
Chapter: 73
Q822:
What does the switch statement do in JavaScript?
A. Performs arithmetic operations
B. Executes different code blocks based on conditions
C. Declares variables
D. Defines functions
Correct Answer:
B
Chapter: 73
Q823:
How is the switch expression evaluated?
A. Once
B. Twice
C. Continuously
D. Never
Correct Answer:
A
Chapter: 73
Q824:
What happens if there is no matching case in a switch statement?
A. The code block for the default case is executed
B. The program throws an error
C. The code block for the first case is executed
D. The switch statement is ignored
Correct Answer:
A
Chapter: 73
Q825:
What keyword is used to exit a case block in a switch statement?
A. return
B. exit
C. stop
D. break
Correct Answer:
D
Chapter: 73
Q826:
Can multiple case labels in a switch statement share the same code block?
A. Yes
B. No
C. Only if they are sequential
D. Only if they are non-sequential
Correct Answer:
A
Chapter: 73
Q827:
What is the default behavior of the default keyword in a switch statement?
A. It specifies the code to run if there is a match
B. It specifies the code to run if there is no match
C. It terminates the switch statement
D. It starts a new switch statement
Correct Answer:
B
Chapter: 73
Q828:
In the provided example, what day of the week does the number 2 represent?
A. Monday
B. Tuesday
C. Wednesday
D. Thursday
Correct Answer:
B
Chapter: 73
Q829:
Fill in the blank: The break keyword is used to stop the execution of more code and ____ inside a switch block.
A. case testing
B. default cases
C. variable declarations
D. function calls
Correct Answer:
A
Chapter: 74
Q830:
What is the purpose of a for loop in JavaScript?
A. To execute a block of code a number of times
B. To define a function
C. To create a new object
D. To declare a variable
Correct Answer:
A
Chapter: 74
Q831:
What does Statement 1 in a for loop typically do?
A. Defines the condition for running the loop
B. Executes each time after the loop
C. Initializes the variable used in the loop
D. Specifies the code block to be executed
Correct Answer:
C
Chapter: 74
Q832:
What is Statement 2 in a for loop used for?
A. To initialize the loop variable
B. To specify the code block to be executed
C. To evaluate the condition for running the loop
D. To execute after the loop
Correct Answer:
C
Chapter: 74
Q833:
What is the default behavior if Statement 2 in a for loop is omitted?
A. The loop will not run
B. The loop will run indefinitely
C. The loop will run only once
D. The loop will execute only if Statement 1 is true
Correct Answer:
B
Chapter: 74
Q834:
Which of the following is true about Statement 3 in a for loop?
A. It is optional
B. It is required to start the loop
C. It defines the condition for running the loop
D. It initializes the loop variable
Correct Answer:
A
Chapter: 74
Q835:
Fill in the blank: In a for loop, Statement 3 can be used to perform actions such as _____.
A. Negative increment
B. Positive increment
C. Variable initialization
D. All of the above
Correct Answer:
D
Chapter: 74
Q836:
What does the for/in loop do in JavaScript?
A. Loops through the properties of an object
B. Loops through a block of code a number of times
C. Loops while a condition is true
D. Loops through an array
Correct Answer:
A
Chapter: 74
Q837:
Given the loop: for (i = 0; i < 5; i++) { text += "The number is " + i + "<br>"; }, what will be the output if i starts from 2?
A. The number is 0, The number is 1, The number is 2, The number is 3, The number is 4
B. The number is 2, The number is 3, The number is 4
C. The number is 0, The number is 1, The number is 2
D. The number is 2, The number is 3, The number is 4, The number is 5
Correct Answer:
B
Chapter: 74
Q838:
What is the output of the following code: var person = {fname:"John", lname:"Doe", age:25}; for (x in person) { text += person[x] + " "; }?
A. John Doe 25
B. John Doe
C. John 25
D. Doe 25
Correct Answer:
A
Chapter: 74
Q839:
Fill in the blank: To loop through an array using a for loop, you can use the length of the array in _____.
A. Statement 1
B. Statement 2
C. Statement 3
D. All statements
Correct Answer:
B
Chapter: 75
Q840:
What does a while loop do in JavaScript?
A. Loops through a block of code while a specified condition is true
B. Loops through a block of code a fixed number of times
C. Executes a block of code once and then checks the condition
D. Loops through the properties of an object
Correct Answer:
A