11. Which of the following input/output devices is not associated with personal computers?

A. mice
B. color monitors
C. punched cards
D. dot-matrix printers
E. optical scanners

12. The ALU of a computer responds to the commands coming from

A. primary memory
B. control section
C. external memory
D. cache memory
E. None of the above

13. The heart of any computer is the

A. CPU
B. Memory
C. I/O Unit
D. Disks
E. None of the above

14. Which of the following are likely to jam the read/write head of a disk pack?

A. Dust
B. Smoke particle
C. Fingerprint smudge
D. All of the above
E. None of the above

15. Impact printers

A. strike a ribbon against the paper to produce character images
B. include ink-jet and thermal devices
C. are more expensive than Laser printers
D. use optical technology
E. None of the above