541. Which of the following devices executes modulation and demodulation?
(A) Fiber optics
(B) Switch
(C) Coaxial cable
D. Modem
542. The conversion of analog signals into digital signals is referred to as:
(A) Modulation
(B) Demodulation
(C) Multiplexing
D. Digitizing
543. X.25 standard consists of how many layers of the OSI model?
A. Two
B. Three
C. Four
D. Five
544. Which of the following is a layer one of the OSI model?
A. Physical layer
B. Data link layer
C. Communication layer
D. Network layer
545. The X.25 standard specifies a:
A. Technique for dial access
B. Technique for start-stop data
C. DTE/DCE interface
D. All of the above
546. What is the main difference between a mainframe and a supercomputer?
A. Supercomputers are much smaller than mainframe computers
B. Supercomputer is much larger than mainframe computers
C. Supercomputers are focused to execute few programs as fast as possible while mainframe uses its power to execute as many programs concurrently
D. Supercomputers are focused to execute as many programs as possible while mainframe uses its power to execute few programs as fast as possible.
547. In Excel, which key is used to format the number in date format?
A. Ctrl+Shift+4
B. Ctrl+Shift+6
C. Ctrl+Shift+3
D. Shift+1
548. Actual working area of Computer’s Microsoft Excel is __?
A. Worksheet
B. Workbook
C. Notesheet
D. Notebook
549. LED stands for
A. Light Emitting Diode
B. Light Emission Digit
C. Light Emission Depot
D. Light Emission Direct
550. If you select the first and second slide and then click on the New Slide button on the toolbar, what will happen then?
A. A new slide is inserted as the third slide in the presentation
B. A new slide is inserted as the second slide in the presentation
C. A new slide is inserted as the first slide in the presentation
D. None of the above
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