SSC General Science & Technology Sample Paper NCERT Sample Paper-7

  • question_answer
    Consider the following statements
    1. Blu-ray Discs (BD) have storage capacity of 25 GB per layer or 50 GB with dual layer discs
    2. Blu-ray Disc is an optical disc storage medium designed to supersede the OVO format.
    3. The standard physical medium of BD is a 12 cm plastic optical disc, the same size as DVDs and CDs. Which of the statement s) given above is/are correct?

    A)  1, 2 and 3        

    B)  1 and 3

    C)  2 and 3

    D)  Only 2

    Correct Answer: A

    Solution :

    [a] Blu-ray or Blu-ray Disc (BD, BRD) is a digital optical disc data storage format. It was designed to supersede the DVD format, in that it is capable of storing high- definition video resolution (1080p). The plastic disc is 12cm in diameter and 1.2 mm thick, the same size as DVDs and CDs. Conventional (pre-BD-XL) Blu-ray Discs contain 25 GB per layer, with dual layer discs (50 GB) being the industry standard for feature-length video discs. Triple- layer discs (100 GB) and quadruple-layers (128 GB) are available for BD-XLre-writer drives. The name "Blu-ray" refers to the blue laser (specifically, a violet laser) used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs. The main application of Blu-ray is as a medium for video material such as feature films and physical distribution of video games for the PlayStation 3, PlayStation 4, and Xbox One. Besides the hardware specifications, Blu-ray is associated with a set of multimedia formats.

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