JavaScript Audio and Video Quiz

To pass the quiz, you must correctly answer at least 18 of the 20 questions below. # --quizzes-- ## --quiz-- ### --question-- #### --text-- What is the purpose of the `Audio()` constructor in JavaScript? #### --distractors-- Create a new audio file. --- Play an existing audio file. --- Modify audio files. #### --answer-- Create a new `audio` element. ### --question-- #### --text-- Which method is used to begin playback of an `audio` or `video` element? #### --distractors-- `start()` --- `begin()` --- `resume()` #### --answer-- `play()` ### --question-- #### --text-- What is the difference between `pause()` and `play()` methods for media elements? #### --distractors-- `pause()` returns a Promise while `play()` does not. --- `pause()` cannot be resumed while `play()` can start from any position. --- `pause()` automatically resets to the beginning while `play()` starts from where the audio was paused. #### --answer-- `pause()` stops playback but maintains the current position while `play()` starts playback. ### --question-- #### --text-- Which audio format has the widest browser support? #### --distractors-- `FLAC` --- `OGG` --- `WAV` #### --answer-- `MP3` ### --question-- #### --text-- What is the purpose of the `source` element within an `audio` or `video` element? #### --distractors-- Specify the volume of the media. --- Add subtitles to the media. --- Link to an external audio processor. #### --answer-- Specify multiple media sources for different formats. ### --question-- #### --text-- What are the two possible MIME types an MP4 format can have? #### --distractors-- `mp4/audio` and `mp4/video` --- `audio/mpeg4` and `video/mpeg4` --- `mp4/mpeg` and `mp4/stream` #### --answer-- `audio/mp4` and `video/mp4` ### --question-- #### --text-- What does a codec do in the context of audio and video? #### --distractors-- Increases the volume of the media. --- Changes the file format of the media. --- Encrypts the media for secure transmission. #### --answer-- Converts media between analogue and digital formats. ### --question-- #### --text-- Which API provides a way to create, process, and analyze audio in web applications? #### --distractors-- Audio Processing API. --- Sound Manipulation API. --- Media Stream API. #### --answer-- Web Audio API. ### --question-- #### --text-- What is the purpose of the `getUserMedia()` method? #### --distractors-- Authenticate users with a media service. --- Retrieve user preferences for media playback. --- Download media files to the user's device. #### --answer-- Access the user's camera and/or microphone. ### --question-- #### --text-- Which property of the `HTMLMediaElement` interface represents the current playback time? #### --distractors-- `time` --- `playbackPosition` --- `currentPosition` #### --answer-- `currentTime` ### --question-- #### --text-- What does the following code snippet do? ```javascript const audio = new Audio('song.mp3'); audio.loop = true; ``` #### --distractors-- Plays the audio file once. --- Increases the volume of the audio. --- Pauses the audio after one loop. #### --answer-- Sets the audio to repeat indefinitely. ### --question-- #### --text-- What is the full meaning of MIME? #### --distractors-- Multiple Internet Message Extensions --- Mail Internet Multimedia Extensions --- Multimedia Internet Mail Extensions #### --answer-- Multipurpose Internet Mail Extensions ### --question-- #### --text-- What does the `canPlayType()` method help you do? #### --distractors-- Check if audio is currently playing in the browser in a specific format. --- Verify if a media file exists in the browser's cache and accessible for playback. --- Test if an audio element has controls enabled and whether the user has appropriate permissions to interact with it. #### --answer-- Determine if a browser is likely to be able to play your specific audio format. ### --question-- #### --text-- Which of the following is NOT a valid event of the `HTMLMediaElement` API? #### --distractors-- `waiting` --- `canplay` --- `ended` #### --answer-- `stopped` ### --question-- #### --text-- What `HTMLMediaElement` event fires when playback is paused due to data buffering? #### --distractors-- `stopped` --- `pause` --- `buffering` #### --answer-- `waiting` ### --question-- #### --text-- Which Web Audio API interface is used to represent an audio-processing graph? #### --distractors-- `AudioNode` --- `AudioBuffer` --- `AudioListener` #### --answer-- `AudioContext` ### --question-- #### --text-- What is the purpose of the Media Source Extensions API? #### --distractors-- Add visual effects to video. --- Convert between different media formats. --- Enable JavaScript to synchronize multiple audio tracks. #### --answer-- It lets you directly pass a user's webcam feed to a video element ### --question-- #### --text-- When is the `ended` event fired? #### --distractors-- When the media source is changed. --- When the `pause()` method is called. --- When the media is manually stopped. #### --answer-- When the end of the media has been reached. ### --question-- #### --text-- How is the Screen Capture API exposed? #### --distractors-- Through the `window.screenCapture` interface --- By using the `navigator.capture` property --- By using the `captureScreen()` method #### --answer-- By calling the `getDisplayMedia()` method. ### --question-- #### --text-- What is the WMV format associated with? #### --distractors-- Wide Media Video --- World Media Video --- Web Media Player #### --answer-- Windows Media Player