11. Vacuum Tubes and Valves were the main components of ________ generation computer?
a. 1st
b. 2nd
c. 3rd
d. NOT
12. ________ prevents a computer from working in a right way?
a. Bug
b. Junk e-mail
c. Both a and b
d. NOT
13. The current CEO of the Microsoft is __________?
a. Bill Gates
b. Satya Nadella
c. Charles Babbage
d. NOT
14. Screen, Printer, and Speaker are all the examples of ______?
a. Input devices
b. Output devices
c. Both a and b
d. NOT
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