21. What are the concentric circles on floppy disks know as?

A. Tracks
B. Cylinders
C. Sectors
D. Segments
E. None of the above

22. A one-bit signal that indicates the start of data transmission by an asynchronous device is

A. Parity bit
B. Status bit
C. Zero bit
D. Start bit
E. None of the above

23. Registers which are partially visible to users and used to hold conditional codes (bits set by the CPU hardware as the result of operations), are known as

A. PC
B. Memory Address Registers
C. General purpose registers
D. Flags
E. None of the above

24. An electronic circuit with about 20 transistors fabricated on a silicon chip is known as

A. SSI
B. MSI
C. DPS
D. RJE
E. None of the above

25. Instructions and memory addresses are represented by

A. character codes
B. binary codes
C. binary word
D. parity bit
E. None of the above