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


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