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Who invented vacuum tubes?

A. John Bardeen

B. William Shockley

C. Lee de Forest

D. All of above

Correct Answer : C.


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  1. Help Menu is available at which button?
  2. The earliest calculating devices are
  3. What is the first stage in software development?
  4. A kind of scanner MICR is the short form of
  5. The device that can both feed data into and accept data from a computer is
  6. Which one of the following input device is user- programmable?
  7. DOS stands for
  8. Chief component of first generation computer was
  9. Which of the following processors use RISC technology?
  10. The main electronic component used in first generation computers was
  11. A computer has very low failure rate because it uses electronic components. It produces very consistent…
  12. Light pen and joystick are________
  13. Which technology is more reliable?
  14. ________ provides process and memory management services that allow two or more tasks, jobs, or programs…
  15. Which is not a computer classification?
  16. Which of the following memory medium is not used as main memory system?
  17. Is an OOP principle
  18. Which is the highest form?
  19. A computer can solve more than one kind of problem. This is related to which of the following characteristics?
  20. A computer program that converts an entire program into machine language is called a/an
  21. Assembly language started to be used from
  22. Algorithm and Flow chart help us to
  23. Which of the following is an example of fifth generation computer?
  24. Which statement is valid about computer program?
  25. Which of the following memories must be refreshed many times per second?
  26. Storage capacity of magnetic disk depends on
  27. What is required when more than one person uses a central computer at the same time?
  28. Most of the first generation computers were
  29. A name or number used to identify storage location devices?
  30. Symbolic logic was discovered by