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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. Personnel who design, program, operates and maintains computer equipment refers to
  2. Which was the world's first microcomputer that used Intel 80386 microprocessor chip?
  3. Compression of digital data for efficient storage is
  4. Which unit converts user data into machine readable form?
  5. Hackers
  6. ALU and Control Unit jointly known as
  7. The language that the computer can understand and execute is called
  8. In 1830, Charles Babbage designed a machine called the Analytical Engine which he showed at the Paris…
  9. You use a(n) ________, such as a keyboard or mouse, to input information
  10. Which is the largest computer?
  11. A Pixel is
  12. One millisecond is
  13. ASCII and EBCDIC are the popular character coding systems. What does ASCII stand for?
  14. Each model of a computer has a unique
  15. Which of the following is not a primary storage device?
  16. Which of the following produces the best quality graphics reproduction?
  17. The ALU of a computer normally contains a number of high speed storage element called
  18. The processing speed of first generation computers was
  19. Which term is used to describe RAM?
  20. A 32 bit microprocessor has the word length equal to
  21. Which of the following magazines covers only the IBM PC and its compatibles?
  22. The first electronic general purpose digital computer built by Eckert and Mauchly called ENIAC did not…
  23. On which aspect the analog computers are better than digital?
  24. In most of the IBM PCs, the CPU, the device drivers, memory, expansion slots and active components are…
  25. Which of the following is correct acronym of VGA?
  26. Bit map terminal
  27. Which of the following is not an input device?
  28. High level language is also called
  29. A datum that indicates some important state in the content of input or output is
  30. Which computer has been designed to be as compact as possible?