Worksheet Solutions: Multimedia, Chat Sites and Social Networks | Computer Science for Grade 9 PDF Download

Q.1. Fill in the blanks with the given words.
(i) Chat Site is a part of an online service that provides a venue for people to exchange messages about a particular subject in real time.
(ii) Vector based animation is a graphic element is stored as a mathematical expression that describes its size, shape, position and other characteristics.
(iii) Ogg is a free, open container audio format maintained by the Xiph.Org Foundation.
(iv) The BMP image format developed by Microsoft do not have any compression or information loss.
(v) JPEG image format uses very less space though the compression is lossy.
(vi) Virtual Reality is a kind of technology to create a simulated environment.
(vii) Social networking is the practice of expanding the number of one’s business and/or social contacts by making connections through individuals, often through social media sites such as Facebook, Twitter, LinkedIn and Google+.
(viii) QuickTime is a video format developed by Apple.
(ix) WMA is an audio format that can compress files at a higher rate compared to MP3.
(x) Lossy compression will result in some loss of data as the compression algorithm eliminates redundant or unnecessary information.

Q.2. State whether the following statements are True (T) or False (F).
(i) TIFF stands for Tagged Image File Format. True
(ii) Vector graphics uses a dot matrix data structure. False
(iii) Generative Graphics is extensively used in drawings and illustrations in the form of 2-D and 3-D pictures. True
(iv) Non- Linear active content progresses often without any navigational control for the viewer such as a cinema presentation. False
(v) TIFF image format is best for web graphics. False
(vi) BMP image format allows lossy compression. False
(vii) GIF format is widely used graphics format for the web. True
(viii) Real Audio files uses a lossy compression. False
(ix) The MIDI is a standard format for digitizing audio of musical instruments. True
(x) Shockwave format video files has the .swf extension. True