JavaScript in head or body Mockest | JavaScript

1.

When JavaScript is placed in the <head> section of an HTML document, it can:

A). Execute before page rendering. B). Execute after page rendering. C). Block rendering until execution. D). None of the above.

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2.

Which attribute can be used to make external JavaScript files load asynchronously in the <head> or <body> sections?

A). async B). defer C). sync D). load

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3.

Placing JavaScript at the end of the <body> section of an HTML document can result in:

A). Faster initial page rendering. B). Slower overall page loading. C). No impact on page performance. D). Delayed execution of JavaScript.

Answer & Solution Discuss in Board

4.

Variables declared in the <head> section of an HTML document are accessible:

A). Globally throughout the document. B). Only within the <head> section. C). Only after the page has fully loaded. D). Nowhere in the document.

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5.

What happens if JavaScript code in the <head> section of an HTML document is not properly handled?

A). It may block rendering and cause delays. B). It automatically moves to the <body>. C). It gets executed twice. D). It has no impact on the page.

Answer & Solution Discuss in Board

6.

Using the defer attribute with an external script in the <head> section means that the script:

A). Loads and executes after HTML parsing. B). Loads synchronously with HTML parsing. C). Loads and executes before HTML parsing. D). Loads but doesn't execute.

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7.

Placing JavaScript at the end of the <body> section is beneficial for:

A). Improving page load speed. B). Blocking page rendering. C). Increasing script complexity. D). Hiding script functionalities.

Answer & Solution Discuss in Board

8.

Which of the following is a recommended practice for optimizing JavaScript performance?

A). Minify and concatenate scripts. B). Include all scripts in the <head>. C). Use synchronous loading for all scripts. D). Load scripts without optimization.

Answer & Solution Discuss in Board

9.

What is the purpose of using the async attribute with an external JavaScript file?

A). To load the script asynchronously. B). To defer script execution. C). To block rendering until script loads. D). To ensure script execution order.

Answer & Solution Discuss in Board

10.

Placing JavaScript in the <head> section can impact page load times because:

A). It blocks rendering until executed. B). It loads scripts asynchronously. C). It reduces HTTP requests. D). It has no impact on loading.

Answer & Solution Discuss in Board

JavaScript in head or body Mocktest

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