ITPEC IP October 2024 Question 1
ITPEC IP October 2024 — Question 1 of 100
A is analog, B is digital, and C is digital. Analog data represents information with a continuously varying physical quantity such as voltage, angle, or length. Digital data represents information with discrete numerical values.
Although music begins as a continuously varying sound wave, a music CD stores samples encoded as binary digital data. Playback equipment converts those stored numbers back into an analog signal for speakers.
Answer (b)
Why not others:
- (a) incorrectly classifies the data stored on a CD as analog
- (c) and (d) reverse the definitions of continuous analog data and discrete digital data
Key rule: Continuous physical variation is analog; discrete numeric representation is digital, and optical media such as CDs store digitally encoded bits.
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