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12. The number of operations per clock tick affects: a. b. c. d. microprocessor performance. disk drive capacity. monitor resolution. the bus size. 13. The ExpressCard is also known as thecard. a. SCSI b. PS/2 c. PCMCIA d. VGA 14. If your computer doesn't have enough USB ports, it is possible to obtain a USB a. router b. hub C. PBX d. multiplexer 15. Which of the following keys or key combinations is typically used to display on-screen help? a. F1 b. Esc c. Ctrl +H d. Enter 16. Five bits result in possibilities. a. 32 b. 64 c. 128 d. 256 17. Hexadecimal numbers are represented using numbers 0 to 9 and letters a. A to F b. A to Z c. A to C d. A to M