Compact Disc — Questions and answers

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Which two big companies worked together to create the universal standard for the Compact Disc?

Choices

  1. Microsoft and Apple
  2. Philips and Sony ✓
  3. Samsung and LG
  4. Google and Amazon

Answer: Philips and Sony

From page 4

How does a CD player read the information on a disc?

Choices

  1. By using a tiny needle to scratch the surface.
  2. By blowing air across the disc to feel for bumps.
  3. By sensing changes in reflected light from a laser. ✓
  4. By listening to the vibrations the disc makes as it spins.

Answer: By sensing changes in reflected light from a laser.

From page 5

What special encoding system did Philips develop to help CD players read data accurately?

Choices

  1. Digital-to-Analog Conversion
  2. Eight-to-Fourteen Modulation (EFM) ✓
  3. Laser Beam Focusing
  4. Pit and Land Tracking

Answer: Eight-to-Fourteen Modulation (EFM)

From page 6

When and where was the Compact Disc officially launched?

Choices

  1. January 1, 1980, in America
  2. October 1, 1982, in Japan ✓
  3. December 25, 1985, in Europe
  4. July 4, 1979, in the Netherlands

Answer: October 1, 1982, in Japan

From page 8

What new type of CD was introduced in 1985 for computers?

Choices

  1. CD-Audio
  2. CD-Video
  3. CD-ROM ✓
  4. CD-RW

Answer: CD-ROM

From page 9

What newer forms of digital media did the Compact Disc help pave the way for?

Choices

  1. Cassette tapes and floppy disks
  2. Vinyl records and 8-track tapes
  3. MP3s, DVDs, and Blu-ray discs ✓
  4. Radio broadcasts and live concerts

Answer: MP3s, DVDs, and Blu-ray discs

From page 10