Correct Answer: Option 3 (a, b and c)
Detailed Explanation:
In electronic communication systems, signals are categorized into analog and digital:
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Statement a is correct:
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Digital signals do not provide a continuous range of values over time; continuous variation is the hallmark of analog signals.
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Statement b is correct:
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Digital signals represent information in distinct, discrete steps (quantized levels) rather than smooth gradients.
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Statement c is correct:
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Modern digital electronic circuits fundamentally operate on the binary system (states of logic 0 and logic 1, corresponding to Low and High voltage levels).
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Statement d is incorrect:
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Digital electronic systems process data in binary form, not in decimal form. Decimal numbers are encoded into binary (e.g., BCD or binary code) before processing.
Hence, statements a, b, and c are correct.
Key differences tested in MPSC Science:
1.
Analog signals: Continuous waveforms prone to attenuation and noise interference.
2.
Digital signals: Discrete square pulses (0 and 1), highly immune to noise, easily stored, encrypted, and processed using microprocessors and DSPs.
