Who invented vacuum tubes?

A. John Bardeen

B. William Shockley

C. Lee de Forest

D. All of above

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. An error in software or hardware is called a bug. What is the alternative computer jargon for it?
  2. The silicon chips used for data processing are called
  3. Which computers used operating systems by Microsoft?
  4. Which of the following is a storage device?
  5. Which number system is usually followed in a typical 32-bit computer?
  6. UNIVAC was a first generation computer. What is its full form?
  7. The system unit of a personal computer typically contains all of the following except:
  8. The digital computer was developed primarily in
  9. Which of the following is the first computer to use Stored Program Concept?
  10. What is required when more than one person uses a central computer at the same time?
  11. The term ________ designates equipment that might be added to a computer system to Enhance its functionality.
  12. An optical input device that interprets pencil marks on paper media is
  13. One of the main feature that distinguish microprocessors from micro-computer is
  14. Which of the following is/ are operating systems
  15. The capacity of 3.5 inch floppy disk is
  16. An integrated circuit is
  17. ________ computer is small general purpose micro computer, but larger than portable computer
  18. A computer program that translates one program instructions at a time into machine language is called…
  19. The metal disks, which are permanently housed in, sealed and contamination free containers are called
  20. Regarding data, computers are very good at
  21. Which of the following is not electro-mechanical computer?
  22. Hard disk is coated in both sides with
  23. The notable features like keyboards, monitors, GUI were developed in
  24. Instruction in computer languages consists of
  25. Which of the following have the fastest access time?
  26. Which of the following code used in present day computing was developed by IBM Corporation?
  27. What was the computer invented by Attanasoff and Clifford?
  28. Who invented Integrated Circuits?
  29. The brain of any computer system is
  30. Examples of output devices are