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4.  Answer the following:

                      a.   What is joystick?






                      b.   What is Touchscreen?








                      c.   What is a printer? Write the names of the different types of printer.







                      d.   What is the role of CPU?







                      e.   What is difference between System software and Application software?








                      f.   What is a primary memory?







                      g.   What is a byte?







                      h.   Differentiate between RAM and ROM.








                      i.   What is a Blu-ray Disc?









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