Quick Revision

GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Computer Fundamentals → Introduction to Computer 40

DMZ in network security is?
Network segment between internet and internal network for public servers
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Social engineering targets?
Human psychology — manipulating people rather than systems
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Defense in depth uses?
Multiple overlapping security layers
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Which component is called the heart of the computer?
Motherboard
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BIOS stands for?
Basic Input Output System
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Which wattage PSU for high-end gaming PC?
650W-850W
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TIM between CPU and cooler?
Fills microscopic gaps to improve heat transfer
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USB Power Delivery (USB-PD) provides up to?
100W (USB-PD 3.0)
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Which HTML tag creates a hyperlink?
<a href>
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Cookie in web technology is?
Small data file stored in browser by website to remember user info
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HTML5 video element is?
<video>
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REST API HTTP DELETE method is used for?
Deleting resources
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Which protocol is connectionless?
UDP (User Datagram Protocol)
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TCP three-way handshake steps are?
SYN, SYN-ACK, ACK
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Windows Registry stores?
OS and application configuration in hierarchical database
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Which Linux command lists directory contents?
ls
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Which Linux command changes directory?
cd
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chmod in Linux is used to?
Change file permissions
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grep command in Linux?
Search text patterns in files
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sudo in Linux means?
Super user do
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Which Linux command shows disk usage?
df -h (disk free) and du -sh
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ping command tests?
Network connectivity and latency
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Which command installs packages in Ubuntu?
apt install
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Process 1 (PID 1) in Linux is?
init/systemd
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Which Linux command shows running processes?
ps
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SIGKILL signal in Linux?
Forcefully terminates process — cannot be caught or ignored
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Linux root user has UID?
0
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Encrypted passwords in Linux are stored in?
/etc/shadow
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Which is the correct SQL to select all columns?
SELECT *
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SQL LIKE wildcard for multiple characters is?
%
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PRIMARY KEY constraint?
Uniquely identifies each record, cannot be null
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FOREIGN KEY creates relationship between?
Two different tables
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Which SQL command modifies existing records?
UPDATE
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Index in database improves?
Data retrieval speed
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Normalization in databases aims to?
Reduce data redundancy and improve integrity
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Which JOIN returns only matching rows?
INNER JOIN
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LEFT JOIN returns?
All rows from left table plus matching from right (NULL where no match)
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SQL stored procedure advantages include?
Pre-compiled execution, reduced network traffic, code reuse
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SQL VIEW is?
Virtual table based on a query
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ACID property Atomicity means?
All operations in a transaction succeed or none do
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