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What was the main disadvantage of vacuum tubes?

A. They were larger in size

B. They consumed a lot of electricity

C. They produced heat and often burned out

D. The operation cost was high

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  14. Web cam is an
  15. What does the disk drive of a computer do?
  16. Which of the following are the best units of data on an external storage device?
  17. RAM is used as a short memory because it is
  18. Which device is used as the standard pointing device in a Graphical User Environment?
  19. Identify the true statement
  20. Charles Babbage was awarded by Royal Society for his
  21. Programs are executed on the basis of a priority number in a
  22. A small or intelligent device is so called because it contains within it a
  23. The two kinds of main memory are:
  24. What difference does the 5th generation computer have from other generation computers?
  25. The operating speed of third generation computer was
  26. Which is valid statement?
  27. Cursor is a
  28. Modern Computers are very reliable but they are not
  29. Through which device the main components of the computer communicate with each other?
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