Which of the following would produce analog signals and which would produce digital signals?

Options

A. A vibrating tuning fork
B. Musical sound due to a vibrating sitar string
C. Light pulse
D. Output of NAND gate

Explanation

Analog and digital signals are used to transmit information, usually through electric signals. In both these technologies, the information such as any audio or video is transformed into electric signals.
The difference between analog and digital technologies is that in analog technology, information is translated into electric pulses of varying amplitude. In digital technology, translation of information is into binary formal (zero or one) where each bit is representative of two distinct amplitudes.
Thus, (a) and (b) would produce analog signal and (c ) and (d) would produce digital signals.