Multiple Browsers MCQs

100 MCQs  (Page 4 of 10)

Attempt Multiple Browsers Quiz
What does the HTTP header Cache-Control: no-cache mean?
The browser may store the response but must revalidate it with the server before each use
The response is cached forever
Caching is disabled only for images
The browser must never store the response
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Which keyboard shortcut performs a hard reload, bypassing the cache, in Chrome or Firefox on Windows?
Ctrl + Shift + N
F5 only
Ctrl + Shift + R (or Ctrl + F5)
Ctrl + R only
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What is the order of the browser's critical rendering path?
Parse HTML into the DOM and CSS into the CSSOM → build the render tree → layout → paint → composite
JavaScript → paint → DOM
Paint → layout → DOM
Layout → DOM → CSSOM → paint
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Which change normally triggers a reflow (layout), rather than just a repaint?
Changing the background color
Changing the text color
Changing visibility to hidden
Changing an element's width
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What is the difference between <script defer> and <script async>?
async preserves the order; defer does not
They are identical
defer runs scripts in document order after the HTML is parsed; async runs each script as soon as it downloads, in any order
defer blocks parsing
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Is browser JavaScript multithreaded on the main thread?
Yes, each function runs on its own thread
Only in Chrome
No; it runs on a single main thread with an event loop, and Web Workers provide background threads
Yes, when async is used
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What does Chrome's back/forward cache (bfcache) do?
It keeps a snapshot of the page in memory so that back and forward navigation is instant
It caches only images
It caches the DNS lookups
It saves the history to disk
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What is the default root font size in major browsers?
12px
10px
16px
14px
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What triggers 'quirks mode' rendering in browsers?
Too many images
A missing or invalid DOCTYPE declaration
Using HTTPS
Using CSS Grid
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Which statement about Chrome's architecture is correct?
It uses one thread for all tabs and extensions
It has no sandbox
It is multi-process, with separate renderer processes (site isolation), so one crashed tab does not crash the whole browser
It runs every tab in one single process
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Word of the Day
04 Nov
Dissect
methodically cut up (a body or plant) in order to study its internal parts.
چیرنا، چاک کرنا

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