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Which of the following memories needs refresh?

A. SRAM

B. DRAM

C. ROM

D. All of above

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

You can do it
  1. When was vacuum tube invented?
  2. Which of the following class of computers can process physical quantities such as speed?
  3. An operating system intended for use on microprocessor based systems that support a single user is
  4. Which of the following contains permanent data and gets updated during the processing of transactions?
  5. The instructions that tell a computer how to carry out the processing tasks are referred to as computer________
  6. Which of the following is a read only memory storage device?
  7. Which programming languages are classified as low level languages?
  8. ________ printer is a non-impact printer and is quite in working
  9. A language which is close to that used within the computer is
  10. Who invented Analytical engine?
  11. If in a computer, 16 bits are used to specify address in a RAM, the number of addresses will be
  12. A disadvantage of the laser printer is
  13. When did arch rivals IBM and Apple Computers Inc. decide to join hands?
  14. What type of resource is most likely to be a shared common resource in a computer Network?
  15. UNIVAC is
  16. A system is
  17. Which of the following IC was used in third generation of computers?
  18. Napier's Bones were invented in
  19. Which type of computers uses the 8-bit code called EBCDIC?
  20. Web cam is an
  21. Which of the following is not a micro computer?
  22. What is the main difference between a mainframe and a super computer?
  23. In a punched card system, data is processed by a
  24. Which statement is valid about magnetic tape?
  25. Which of the following is not anti- viruses' software?
  26. Which of the following is true?
  27. Who developed a mechanical device in the 17th century that could add, subtract, multiple, divide and…
  28. The ALU of a computer responds to the commands coming from
  29. Magnetic disks are the most popular medium for
  30. A group of magnetic tapes, videos or terminals usually under the control of one master is