Bit FAQs:

Q: Is a bit typically defined as the information entropy of a binary random variable that is 0 or 1 with equal probability?

A: Yes, or the information that is gained when the value of such a variable becomes known.

Q: Was a bit often stored as the position of a mechanical lever or gear?

A: Yes, or the presence or absence of a hole at a specific point of a paper card or tape.

Q: Are bits encoded as the thickness of alternating black and white lines?

A: Yes.

Q: Are bits transmitted one at a time in serial transmission?

A: Yes, and by a multiple number of bits in parallel transmission.

Q: Is a bit not defined in the International System of Units?

A: Yes, However, the International Electrotechnical Commission issued standard IEC 60027, which specifies that the symbol for binary digit should be bit, and this should be used in all multiples, such as kbit, for kilobit.

Q: Is a bit a quantum system that can exist in superposition of two classical bit values?

A: Yes.

Q: Is a bit usually represented by an electrical voltage or current pulse?

A: Yes, or by the electrical state of a flip-flop circuit.

Q: Are bits used in the punched cards invented by Basile Bouchon and Jean-Baptiste Falcon?

A: Yes, and developed by Joseph Marie Jacquard , and later adopted by Semen Korsakov, Charles Babbage, Hermann Hollerith, and early computer manufacturers like IBM.

Q: Is a bit encoded as the presence or absence of a microscopic pit on a reflective surface?

A: Yes.

Q: Was a bit represented by the polarity of magnetization of a certain area of a ferromagnetic film?

A: Yes, or by a change in polarity from one direction to the other.