Welcome to the Caching and Debugging MCQs Page

Dive deep into the fascinating world of Caching and Debugging with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Caching and Debugging, a crucial aspect of JavaScript. In this section, you will encounter a diverse range of MCQs that cover various aspects of Caching and Debugging, 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 Caching and Debugging. 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 Caching and Debugging. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Caching and Debugging MCQs | Page 5 of 11

Explore more Topics under JavaScript

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Basics of JavaScript

02

Arrays and Functions

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Classes and Modules

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Server Side and Client Side Scripting

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07

Performance Measures in JavaScript

08

Socket Programming with JavaScript

09

Parsing, Benchmarking and Logging

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Invocation and Performance

11

JavaScript Animation

Q41.

When does a memory leak happen?

Browser doesn't release memory from objects unnecessary

Browser releases too many memories

All of the mentioned

None of the mentioned

Discuss

Answer: (a).Browser doesn't release memory from objects unnecessary

Q42.

Which of the following functions are referenced internally?

setTimeout

setInterval

both setTimeout and setInterval

none of the mentioned

Discuss

Answer: (c).both setTimeout and setInterval

Q43.

What is the purpose of destroying the functions and objects?

Consume unnecessary CPU cycles

Prevent the dropping of reference count to 0

Centralize the responsibility to clean up

All of the mentioned

Discuss

Answer: (d).All of the mentioned

Q44.

When does a cycle occur during memory leak?

No reference occurs

Two objects reference

One object gets referenced

Discuss

Answer: (b).Two objects reference

Q45.

Which of the following is a way to retain an object in memory?

Console Log

Closures

Destory objects

All of the mentioned

Discuss

Answer: (a).Console Log

Q46.

In which format does JavaScript support external JavaScript?

.js

.php

.js/php

.jss

Discuss

Answer: (a)..js

Q47.

What are the two parts of JavaScript libraries?

'script' tag and 'body' tag

External JavaScript and the 'script' tag

'html' tag and 'body' tag

None of the mentioned

Discuss

Answer: (b).External JavaScript and the 'script' tag

Q48.

Which of the following is added to prefs.js when the console is automatically opened during JavaScript error?

user_pref("javascript.console.open_on_error", true);

user_pref("javascript.console.open_error ", true);

user_pref("javascript.console.open_error ", false);

user_pref(" javascript.console.open_on_error", false);

Discuss

Answer: (a).user_pref("javascript.console.open_on_error", true);

Q49.

Which of the following is possible to be referenced in external JavaScript?

cpp

php

all of the mentioned

Discuss

Answer: (c).php

Q50.

Which of the following attribute takes the source of the PHP file?

img

src

source

none of the mentioned

Discuss

Answer: (b).src

Page 5 of 11

Welcome to the Caching and Debugging MCQs Page

Caching and Debugging MCQs | Page 5 of 11

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

Invocation and Performance

JavaScript Animation

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