Overview of Computing Systems
Computer Studies · 50 practice questions
The two main constituents of a computer - hardware and software; characteristics of computers (electronic, accuracy, speed, interactive, reliability, consistency, large storage); computer hardware - Central Processing Unit (ALU, Control Unit, Registers such as MDR, MAR, MBR, AC, PC and CIR), input devices (keyboard, mouse, scanner, joystick, light pen, digital camera), output devices (monitor, printer, speaker, plotter), and storage (primary - RAM, ROM; secondary - floppy disk, hard disk, CD, DVD, USB) with units of measurement (bits, bytes, kilobytes, megabytes, gigabytes, terabytes); logic circuits and gates (AND, OR, NOT, NAND, NOR), truth tables and comparators; system software (operating systems, utility software, translators) and application software (word processing, spreadsheet, database, presentation, graphics, accounting packages), including the difference between open source and proprietary software.
- Define a computer system and list its functional parts.
- Explain the characteristics of computers.
- Differentiate between hardware and software.
- Explain the functions of input, output, processing and storage devices.
- Distinguish between primary and secondary memory.
- Define and interpret logic gates and construct truth tables.
- Differentiate between system software and application software and give examples of each.
Try a few questions
- Practice question 1
A plotter is an output device used to produce high-quality line drawings, often for
- A.technical or architectural designs
- B.basic database reports exclusively
- C.everyday word processing documents
- D.simple audio recordings
Show the answer
A. technical or architectural designs
Plotters are specialized output devices particularly suited to precise line-based technical or architectural drawings.
- Practice question 2
A NAND logic gate produces a low (0) output only when
- A.all of its inputs are high (1)
- B.none of its inputs are high (1)
- C.exactly one input is high and one is low
- D.at least one of its inputs is low (0)
Show the answer
A. all of its inputs are high (1)
A NAND gate is essentially an AND gate followed by inversion, producing a low output only when every input is high.
- Practice question 3
A touchscreen is both an input and output device, allowing a user to interact directly with
- A.the visual display
- B.a printer's output tray exclusively
- C.a keyboard's individual keys exclusively
- D.a network cable's physical connector exclusively
Show the answer
A. the visual display
Touchscreens uniquely combine input and output functions within the same visual display surface.
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