Welcome to the Invocation and Performance MCQs Page

Dive deep into the fascinating world of Invocation and Performance with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Invocation and Performance, a crucial aspect of JavaScript. In this section, you will encounter a diverse range of MCQs that cover various aspects of Invocation and Performance, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within JavaScript.

Check out the MCQs below to embark on an enriching journey through Invocation and Performance. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of JavaScript.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Invocation and Performance. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Invocation and Performance MCQs | Page 8 of 9

Explore more Topics under JavaScript

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Basics of JavaScript

02

Arrays and Functions

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Classes and Modules

04

Server Side and Client Side Scripting

05

Document Object Model and Event Handling

06

Graphics and Rendering

07

Performance Measures in JavaScript

08

Socket Programming with JavaScript

09

Parsing, Benchmarking and Logging

10

Caching and Debugging

11

JavaScript Animation

Q71.

Where is the external JavaScript placed in the case of lazy loading?

After window.onload event

Before window.onload event

All of the mentioned

None of the mentioned

Discuss

Answer: (a).After window.onload event

Q72.

What are the parameters of the attachEvent function?

Function

Function, Event

Event, Function

Event

Discuss

Answer: (c).Event, Function

Q73.

What is the result when the showPerformanceMetrics() is called before loading the remote script?

Throws an exception

Throws an error

It will load by itself

None of the mentioned

Discuss

Answer: (b).Throws an error

Q74.

Which of the following is an attribute to the script object?

onclick

onload

onshow

all of the mentioned

Discuss

Answer: (b).onload

Q75.

Which is the method used to add an event listener?

addEventListener()

addListener()

addEvent(Listener)

addListener(Event)

Discuss

Answer: (a).addEventListener()

Q76.

What is the purpose of the domLoading attribute?

Document exists

Document can load

Document has loaded

Document begins to load

Discuss

Answer: (d).Document begins to load

Q77.

How is the render time calculated?

Date.Now()

Date.Now() - performance.timing.domLoading

performance.domLoading

Date.Now() - performance.domLoading

Discuss

Answer: (b).Date.Now() - performance.timing.domLoading

Q78.

What is the inital step to set up a CSS Lazy Loading?

Fetching data

Loading the script

Loading the page

Adding the event listener

Discuss

Answer: (a).Fetching data

Q79.

What is the purpose of holding whatever tag you create in the attribute type?

To have more information

To identify the scripting language

All of the mentioned

None of the mentioned

Discuss

Answer: (b).To identify the scripting language

Q80.

What does the rel attribute of a variable have when the type of file is CSS?

css

stylesheet

text/css

all of the mentioned

Discuss

Answer: (b).stylesheet

Page 8 of 9

Welcome to the Invocation and Performance MCQs Page

Invocation and Performance MCQs | Page 8 of 9

Explore more Topics under JavaScript

Basics of JavaScript

Arrays and Functions

Classes and Modules

Server Side and Client Side Scripting

Document Object Model and Event Handling

Graphics and Rendering

Performance Measures in JavaScript

Socket Programming with JavaScript

Parsing, Benchmarking and Logging

Caching and Debugging

JavaScript Animation

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