A digital signal
A. does not provide a continuous set of values.
B. can utilise binary system
C. represents values as discrete steps
D. can utilise decimal as well as binary system
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A, B, C and D
A digital signal is one that takes only a limited set of distinct values, in contrast to an analog signal that varies continuously. Each statement is a property of such a signal.
A. does not provide a continuous set of values — Correct. A digital signal jumps between separate levels (rectangular pulses) and has no values in between.
B. can utilise binary system — Correct. The two levels, low and high, represent the digits 0 and 1, which is the most common use.
C. represents values as discrete steps — Correct. This is what makes it digital.
D. can utilise decimal as well as binary system — Correct. A digital signal is defined by its discrete values, not by the number of levels, so it can carry the binary system (two levels) or the decimal system (ten levels).
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), and it also appears to be out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Basic Terminology Used in Electronic Communication Systems – “… Signals can be either analog or digital. Analog signals are continuous variations of voltage or current. … Digital signals are those which can take only discrete stepwise values. Binary system that is extensively used in digital electronics employs just two levels of a signal. … They employ suitable combinations of number systems such as the binary coded decimal (BCD).”