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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  13. Is an OOP principle
  14. Which of the following have low failure rate?
  15. Floppy disks which are made from flexible plastic material are also called?
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  19. VDU is also called
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  21. In a computer, most processing takes place in
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