Computer basics questions and answers
Input and output devices, storage, files, networks and digital literacy.
These are practice variations, many generated from templates and numeric inputs, not an official question bank. They remain outside search indexing until at least 100 independently reviewed questions across five chapters are available.
Questions and clear answers
01Hardware · foundation · Editorial previewWhat does a computer CPU do?+
The CPU executes program instructions and performs general-purpose processing operations.
02Hardware · foundation · Editorial previewWhat is RAM used for?+
RAM temporarily holds working program data while a computer is powered and running.
03Devices · foundation · Editorial previewWhat is the difference between input and output devices?+
A keyboard sends input to a computer; a monitor presents output from the computer.
04Files · foundation · Editorial previewWhat is a file extension?+
A suffix such as .pdf or .png often indicates a file format but does not guarantee its actual contents.
05Storage units · advanced · Editorial previewIn computer basics — Storage units: A storage units activity has 3811 files using 10 MB each and 26 MB of extra files. Find total storage.+
Total = 3811 × 10 + 26 = 38136 MB, before filesystem overhead.
06RAM usage · foundation · Editorial previewIn computer basics — RAM usage: A device has 4610 MB free memory. Two tasks use 17 MB and 1 MB. How much free memory remains?+
Remaining free memory = 4610 − 17 − 1 = 4592 MB, assuming no other changes.
07Processing · foundation · Editorial previewIn computer basics — Processing: A workload performs 410 independent tasks, each taking 24 seconds sequentially. How many seconds in total?+
Sequential time = 410 × 24 = 9840 seconds (parallelism not assumed).
08Input and output · intermediate · Editorial previewIn computer basics — Input and output: A computer is connected to 8 keyboards and 15 monitors. Which are input devices?+
The 8 keyboards are input devices; the 15 monitors are output displays.
09Files and folders · foundation · Editorial previewIn computer basics — Files and folders: A folder contains 2008 files and you move 15 files out of it. How many remain?+
Remaining files = 2008 − 15 = 1993, assuming no other changes.
10Downloads · advanced · Editorial previewIn computer basics — Downloads: An update is 2807 MB and the effective download speed stays at 22 MB/s. Find the ideal download time.+
Time = 2807/22 ≈ 127.59 seconds (assuming MB/s, not Mb/s).
11Display resolution · intermediate · Editorial previewIn computer basics — Display resolution: A screen or image is 71920 px wide and 60 px high. How many pixels does it contain?+
Pixels = 71920 × 60 = 4315200.
12File backups · foundation · Editorial previewIn computer basics — File backups: A backup plan covers 4405 GB and a verified copy stores 13 GB. How much has not yet been copied?+
Uncopied amount = 4405 − 13 = 4392 GB (assuming the same units and no duplicate data).
13Battery power · foundation · Editorial previewIn computer basics — Battery power: A device starts at 90% charge, consumes 20 percentage points/hour, and is used for 16 minutes. What percentage is left under a linear model?+
Battery remaining = max(0, 90 − 20 × 16/60) ≈ 84.67% (approximate linear assumption).
14Network throughput · intermediate · Editorial previewIn computer basics — Network throughput: A network throughput transfer sends 8032 megabits at a steady 4 megabits/second. Find ideal transfer time.+
Time = size/rate = 8032/4 ≈ 2008 seconds, ignoring protocol overhead.
15Simple algorithms · advanced · Editorial previewIn computer basics — Simple algorithms: A simple algorithms lesson uses sample 1803. What is the main limitation of assuming the sample applies to every real device?+
Real configuration, version and context matter; verify the relevant official documentation rather than generalizing from sample 1803.
16Internet safety · foundation · Editorial previewIn computer basics — Internet safety: An email asks the owner of device 2602 to install a 'security fix' from an unknown link. What should they do?+
Do not install it. Verify updates through the official vendor or operating system, and independently check the sender and domain.
17Storage units · intermediate · Editorial previewIn computer basics — Storage units: A storage units activity has 3401 files using 2 MB each and 41 MB of extra files. Find total storage.+
Total = 3401 × 2 + 41 = 6843 MB, before filesystem overhead.
18RAM usage · foundation · Editorial previewIn computer basics — RAM usage: A device has 4200 MB free memory. Two tasks use 9 MB and 17 MB. How much free memory remains?+
Remaining free memory = 4200 − 9 − 17 = 4174 MB, assuming no other changes.
This is an educational practice preview. Answers and board-specific alignment are undergoing editorial review; these are not official exam questions.