May 21, 20222 min

Top 40 JavaScript Placement Questions and Answers

Updated: Oct 15, 2022

As developers include more interactivity and complexity into their programs, JavaScript has become an essential part of the Internet experience. It is required for search engines, e-commerce, content management systems, responsive design, social media, and phone applications to function. PayPal uses JavaScript on the front end of their website for quite some time. Microsoft also uses JavaScript to build its Edge web browser.

Thus Mobiprep has curated a list of top 40 JavaScript placement questions and answers which can help you ace the placement process.

Basic JavaScript Placement Questions

Q1. What are the three important manipulations done in for loop on a loop variable?

  • Updation, Incrementation, Initialization

  • Initialization, Testing, Updation

  • Testing, Updation, Testing

  • Initialization, Testing, Incrementation

Q2. A function definition expression can be called as:

  • Function prototype

  • Function literal

  • Function calling

Q3. The expression of calling (or executing) a function or method in JavaScript is called :

  • Primary expression

  • Functional expression

  • Invocation expression

Q4. The script tag must be placed in __________

  • the head tag

  • the head or body

  • the title or head

  • after the body tag

Q5. The four kinds of class members are ________

  • Instance methods, Instance fields, Static method, Dynamic method

  • Instance fields, Instance methods, Class fields, Class methods

  • Instance fields, Non-instance fields, Dynamic methods, Global methods

  • Global methods, Local methods, Dynamic methods, Static methods

Q6. The scope of a function is also called as ________

  • Predefined function

  • Module function

  • Public function

  • Private function

Q7. The basic difference between JavaScript and Java is _________

  • There is no difference

  • Functions are considered as fields

  • Variables are specific

  • Functions are values, and there is no hard distinction between methods and fields

Q8.The regular expression to match any one character not between the brackets is:

  • […]

  • [^]

  • [^…]

  • [\D]

Q9. What are the events generated by the Node objects called?

  • Generators

  • Emitters

  • Dispatchers

  • High events

Q10. Which of the following is an event emitter?

  • Once

  • Process

  • Listeners

  • On

Q11. Which is the function used to retrieve a value?

  • get()

  • retrieve()

  • getItem()

  • retrieveItem()

Q12. What is the method used to pause “data” events?

  • s.pause();

  • s.stop();

  • s.halt();

  • s.wait();

Q13. Which is the handler method used to invoke when uncaught JavaScript exceptions occur?

  • Onhalt

  • Onerror

  • Both onhalt and onerror

  • Onsuspend

Q14.The paragraph “p” is a part of __________

  • a) h1

  • b) body

  • c) html

  • d) both body and html

Q15. The URL property belongs to which of the following object?

  • Document

  • Element

  • Location

  • Event

For more JavaScript placement questions and answers download our free handbook below.

Mobiprep handbooks are free downloadable placement preparation resources that can help you ace any company placement process. We have curated a list of the 40 most important MCQ questions with detailed explanations to ensure the best placement preparation.

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