Page 324 - Web Applications (803) Class 12
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15. List any two features of JavaScript
Ans. JavaScript is a high-level, dynamically typed, and interpreted programming language popular for web development.
Its key features include its lightweight nature, support for both functional and object-oriented programming, and
a diverse set of libraries for tasks such as DOM manipulation.
16. What is NaN in JavaScript?
Ans. In JavaScript, NaN stands for “Not-a-Number”. It is a special value that indicates the outcome of a mathematical
operation that is invalid or unrepresentable, such as dividing zero by zero or attempting to execute a numeric
operation on a non-numeric variable.
17. Which special variable in JavaScript has the capacity to hold several values?
Ans. Array
18. Which tag can be used only in Internet Explorer to add audio files to your web page?
Ans. Audio Tag
19. In JavaScript, if a variable is declared without assigning any value, what is its datatype?
Ans. undefined datatype
20. Which area of Windows Movie Maker enables you to view individual clips or entire project before publishing it
as a movie?
Ans. Preview Monitor
21. What is the use of isFinite() in JavaScript?
Ans. In JavaScript, the isFinite() method determines whether or not the given value is a finite number.
22. Name any two open-source video editing tools.
Ans. Blender, Avidemux
23. Name any two components of a web page that a search engine indexes.
Ans. Page keywords and Page headers
24. Which key is used to import several consecutive and non-consecutive video clips in Windows Movie Maker?
Ans. Consecutive: Shift key
Non-consecutive: Ctrl key
25. Why should we use templates in website designing?
Ans. We should use templates in website designing because:
• They are easy to use • They are more efficient • They save time and money.
26. Which advanced feature of web design extends the capability of the main program by adding enhanced custom
commands and specialized features?
Ans. Add-ins
27. What does MIDI stand for and what is its purpose?
Ans. MIDI or Musical Instrument Digital Interface, serves as a bridge between an instrument and a sound-generating
device. The application that controls the sound card on the Internet is a MIDI file.
28. What are Smart Objects?
Ans. Layers with image data from raster or vector images, such as those in Photoshop or Illustrator files, are called
“Smart Objects.” Smart Objects keep the original qualities of an image’s source content intact, allowing you to
change the layer without causing any damage.
29. How can you write comments in JavaScript?
Ans. Comments can be added as follows:
• Single Line Comment—It is represented by // (double forward slash)
• Multi-line Comment—/*---Comment here---*/
30. What is the output of 20+50+ “35” in JavaScript?
Ans. 7035
322 Touchpad Web Applications-XII

