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The five questions
1. Refer to the exhibit. The value shown is an unsigned binary number. What is its equivalent in the decimal number system that people use every day?
Correct answer: A.
Binary 1010 has bits worth 8, 4, 2, and 1 from left to right. Only the 8 and 2 positions are set, and 8 plus 2 equals 10 in decimal.
Why the others are wrong. The answer 8 counts only the leftmost set bit and ignores the 2 position that is also on. The answer 12 would require the 4 bit to be set, but that position is 0 here. The answer 20 doubles the correct value, as if an extra bit were added on the right.
2. A new employee is setting up a computer and needs to add devices that send information into the computer. Which two devices below are input devices? (Choose two.)
- A. A keyboard
- B. A microphone
- C. A monitor
- D. A printer
- E. A speaker
Correct answer: A.
A keyboard sends typed characters into the computer and a microphone sends captured sound into it, so both are input devices. Input devices carry information from the user to the machine.
Why the others are wrong. A monitor displays the computer's picture, making it an output device, not input. A printer produces paper copies, which is also output. A speaker plays sound outward to the user, so it is output as well. None of these three send information into the computer.
3. A student asks why digital computers represent all data using only two digits, 0 and 1, at the hardware level. What is the main reason?
- A. Electronic circuits reliably represent two states, such as on or off
- B. Binary numbers are simpler for people to read than decimal is
- C. Two digits let computers display many more colors on a screen
- D. Binary was mandated by early international networking standards bodies
Correct answer: A.
Hardware components like transistors are naturally in one of two states, on or off, which map cleanly to 1 and 0. Two states are simple to build reliably, so computers use binary internally.
Why the others are wrong. Binary is actually harder for people to read than decimal, not easier, so readability is not the reason. Color depth on a screen depends on how many bits are used per pixel, not on the choice of two digits. No networking standard forced computers to use binary; the choice comes from the physics of electronic switches.
4. A small company wants one central computer that stays on all day and stores shared files so many employees can reach those files at once. What is this?
- A. A server
- B. A tablet
- C. A smartphone
- D. A webcam
Correct answer: A.
A server is a computer that runs continuously to provide files, applications, or other resources to many users on a network at the same time. Central shared storage is a classic server role.
Why the others are wrong. A tablet is a personal mobile device for one user, not a shared always-on system. A smartphone is also a single-user handheld for calls and apps. A webcam is only a camera peripheral that captures video and cannot store or serve files to a network.
5. A user opens a photo editor, which then saves a file to the hard drive without the user managing memory or disk directly. What software makes that possible?
- A. A web browser
- B. The BIOS chip
- C. A spreadsheet program
- D. The operating system
Correct answer: D.
The operating system sits between applications and hardware, so it manages memory, storage and processes on the program's behalf. The photo editor simply asks the operating system to save the file, and the OS handles the hardware details.
Why the others are wrong. A web browser only displays web pages and cannot manage the whole computer's memory and disks. The BIOS chip starts the hardware at power-on but does not run applications or manage files during normal use. A spreadsheet program is itself an application that relies on the operating system, so it cannot be the layer providing these services.
6. A web designer wants to define the headings, paragraphs, and links that make up the structure of a web page. Which category of language is designed for that job?
- A. A query language
- B. A programming language
- C. A markup language
- D. A scripting language
Correct answer: C.
HTML is a markup language: it uses tags to describe and structure content such as headings, paragraphs, and links so a browser knows how to display them. It structures content rather than performing calculations.
Why the others are wrong. A query language such as SQL asks a database for data and does not lay out a page. A programming language builds full applications with logic and calculations, which is more than a page needs for structure. A scripting language automates tasks or adds behavior but does not define a page's basic structure.
7. A store's register logs a long list of individual sale amounts with no labels or totals. In that raw form, this collection is best described as what?
- A. Information
- B. A report
- C. Data
- D. An insight
Correct answer: C.
Data is raw, unprocessed facts such as individual numbers or measurements that have not yet been organized or given meaning. Until it is summarized or interpreted, a plain list of amounts stays at the data stage.
Why the others are wrong. Information is data that has been processed into something meaningful, which this unlabeled list is not yet. A report presents processed results in a formatted way for readers, so it is a later step. An insight is a conclusion drawn from analysis, which requires the data to be studied first.
8. A clinic keeps patient records so that only authorized staff can view them and outsiders cannot. Which part of the CIA triad does this practice protect?
- A. Integrity
- B. Availability
- C. Confidentiality
- D. Accountability
Correct answer: C.
Confidentiality means information is kept secret and readable only by people who are authorized to see it. Restricting patient records to approved staff protects that secrecy directly.
Why the others are wrong. Integrity is about keeping data accurate and unaltered, not about who may read it. Availability means the records are there when staff need them, which is a different goal. Accountability tracks who did what, and it is not one of the three core CIA triad goals.
