Explore topic-wise MCQs in Javascript.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.

1.

WHICH_PROPERTY_IS_USED_TO_MANAGE_MULTIPLE_EVENT_HANDLERS??$

A. onmessage
B. onerror
C. both onmessage and onerror
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
2.

Which is the function that allows a worker to terminate itself?$

A. close()
B. exit()
C. terminate()
D. halt()
Answer» B. exit()
Discussion
3.

How can you send data using a Worker object?

A. postMessage()
B. sendMessage()
C. Message()
D. post()
Answer» B. sendMessage()
Discussion
4.

What will happen if you specify an absolute URL in the Worker constructor?

A. Resolves itself
B. Must have the same origin
C. Must not have the same origin
D. None of the mentioned
Answer» C. Must not have the same origin
Discussion
5.

Which will be invoked to create a new worker?

A. Function
B. Destructor
C. Constructor
D. Interface
Answer» D. Interface
Discussion
6.

Which of the following is a global object for a new worker?

A. WorkerGlobalScope
B. Worker
C. WorkerScope
D. Window
Answer» B. Worker
Discussion
7.

The object that looks to the thread that creates it is

A. Window
B. Worker
C. Element
D. Hash
Answer» C. Element
Discussion
8.

Why shouldn’t JavaScript functions not be too long?$

A. User friendliness
B. Tie up event loops
C. Browser becomes unresponsive
D. All of the mentioned
Answer» E.
Discussion
9.

Which of the following functions are synchronous?

A. load()
B. require()
C. both load() and require()
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
10.

Which of the following is one of the fundamental features of JavaScript?

A. Single-threaded
B. Multi-threaded
C. Both Single-threaded and Multi-threaded
D. None of the mentioned
Answer» B. Multi-threaded
Discussion