Explore topic-wise MCQs in Javascript.

This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.

1.

What will the following code do?

A. Nothing
B. j=0 & i=5
C. Error
D. Cannot be determinedView Answer
Answer» C. Error
Discussion
2.

How do we break from an infinite loop without keeping a break statement within the loop?

A. Press Ctrl+C
B. Press Ctrl+Z
C. Loop won’t be terminated
D. Press Ctrl+X
Answer» B. Press Ctrl+Z
Discussion
3.

What will be the output for the following code?

A. i=0,k=1
B. i=0,k=0
C. i=1,k=0
D. i=1,k=1View Answer
Answer» B. i=0,k=0
Discussion
4.

There can be multiple decision variables for while loop.

A. True
B. False
Answer» B. False
Discussion
5.

A for-loop can have multiple index values.

A. True
B. False
Answer» B. False
Discussion
6.

What is the nature of the following code?

A. j=0 & i=1
B. j=1 & i=0
C. i=8 & j=36
D. ErrorView Answer
Answer» B. j=1 & i=0
Discussion
7.

How many times will the following loop run?

A. No output due to some error
B. 1 times
C. 0 times
D. 3 timesView Answer
Answer» D. 3 timesView Answer
Discussion
8.

A break statement will leave the outer loop.

A. True
B. False
Answer» C.
Discussion
9.

What is the size of i after the following code is run in MATLAB?

A. No output
B. 0*0
C. i=-1
D. ErrorView Answer
Answer» C. i=-1
Discussion
10.

What is the default increment value in a for-loop?

A. 0
B. 1
C. An increment value is necessary
D. 0/1
Answer» C. An increment value is necessary
Discussion
11.

What\'s wrong? (x = 4 && y = 5) ? (a = 5) ; (b = 6);

A. the first semicolon should be a colon
B. the question mark should be an equal sign
C. the conditional operator is only used with apstrings
D. there are too many variables in the statement
Answer» B. the question mark should be an equal sign
Discussion
12.

What\'s wrong? for (int k = 2, k <=12, k )

A. the variable must always be the letter i when using a for loop
B. the increment should always be k
C. the commas should be semicolons
D. there should be a semicolon at the end of the statement
Answer» D. there should be a semicolon at the end of the statement
Discussion
13.

Which looping process checks the test condition at the end of the loop?

A. while
B. for
C. no looping process checks the test condition at the end
D. do-while
Answer» E.
Discussion
14.

ONE_OF_THE_SPECIAL_FEATURE_OF_AN_INTERPRETER_IN_REFERENCE_WITH_THE_FOR_LOOP_IS_THAT____________?$

A. Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property
B. The iterations can be infinite when an interpreter is used
C. The body of the loop is executed only once
D. the iteration is finite when an interpreter is used
Answer» E.
Discussion
15.

No_output_due_to_some_error$

A. 1 times
B. 0 times
C. 3 times
Answer» B. 0 times
Discussion
16.

j=0_&_i=1

A. j=1 & i=0
B. i=8 & j=36
C. Error
Answer» C. Error
Discussion
17.

A break statement will leave the outer loop?

A. True
B. False
Answer» B. False
Discussion
18.

No, this will throw an exception as only numerics can be used in a for loop

A. No, this will not iterate
B. Yes, this will work
C. No, this will result in a runtime error with the message “Cannot use Linked List”
Answer» B. Yes, this will work
Discussion
19.

No output will be shown

A. a=10;
B. a=80
C. Error in the code
Answer» C. Error in the code
Discussion
20.

What are the three important manipulations done in a for loop on a loop variable?

A. Updation, Incrementation, Initialization
B. Initialization,Testing, Updation
C. Testing, Updation, Testing
D. Initialization,Testing, Incrementation
Answer» D. Initialization,Testing, Incrementation
Discussion