72. How many address lines are needed to address each machine location in a 2048 x 4 memory chip? A) 10 B) 11 C) 8 D) 12 73. Properly arranged data is called A) Field B) Words C) Information D) File 74. A computer consists of A) A central processing unit B) A memory C) Input and output unit D) All of the above 75. Why are vacuum tubes also called valves? A) Because they can amplify the weak signals and make them strong B) Because they can stop or allow the flow of current C) Both of above D) None of above 76. John Napier invented Logarithm in A) 1614 B) 1617 C) 1620 D) None of above