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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.

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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

Q71.
Where is the external JavaScript placed in the case of lazy loading?

a.

After window.onload event

b.

Before window.onload event

c.

All of the mentioned

d.

None of the mentioned

Discuss
Answer: (a).After window.onload event
Q72.
What are the parameters of the attachEvent function?

a.

Function

b.

Function, Event

c.

Event, Function

d.

Event

Discuss
Answer: (c).Event, Function
Q73.
What is the result when the showPerformanceMetrics() is called before loading the remote script?

a.

Throws an exception

b.

Throws an error

c.

It will load by itself

d.

None of the mentioned

Discuss
Answer: (b).Throws an error
Q74.
Which of the following is an attribute to the script object?

a.

onclick

b.

onload

c.

onshow

d.

all of the mentioned

Discuss
Answer: (b).onload
Q75.
Which is the method used to add an event listener?

a.

addEventListener()

b.

addListener()

c.

addEvent(Listener)

d.

addListener(Event)

Discuss
Answer: (a).addEventListener()
Q76.
What is the purpose of the domLoading attribute?

a.

Document exists

b.

Document can load

c.

Document has loaded

d.

Document begins to load

Discuss
Answer: (d).Document begins to load
Q77.
How is the render time calculated?

a.

Date.Now()

b.

Date.Now() - performance.timing.domLoading

c.

performance.domLoading

d.

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?

a.

Fetching data

b.

Loading the script

c.

Loading the page

d.

Adding the event listener

Discuss
Answer: (a).Fetching data
Q79.
What is the purpose of holding whatever tag you create in the attribute type?

a.

To have more information

b.

To identify the scripting language

c.

All of the mentioned

d.

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?

a.

css

b.

stylesheet

c.

text/css

d.

all of the mentioned

Discuss
Answer: (b).stylesheet
Page 8 of 9

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