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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 35

Which tool generates API documentation automatically?
Swagger / OpenAPI specification
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Load testing verifies?
System behavior under high load (many concurrent users)
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Which tool is used for API load testing?
Apache JMeter / k6 / Gatling
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Selenium is used for?
Web browser automation and UI testing
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JUnit is a testing framework for?
Java — unit testing
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pytest is a testing framework for?
Python — simple, powerful unit and integration testing
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Code coverage 100% means?
Every line of code is executed at least once by the test suite
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SonarQube is used for?
Static code analysis and code quality management
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POP3 uses which port?
110
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IMAP uses which port?
143
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DKIM adds which security to emails?
Digital signature — verifies email wasn't modified and confirms sender domain
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Which OSI layer is responsible for end-to-end communication?
Layer 4 (Transport)
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Which OSI layer is responsible for routing between networks?
Layer 3 (Network — IP)
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MAC address operates at which OSI layer?
Layer 2 (Data Link)
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Which device operates at all 7 OSI layers?
Firewall / Application gateway
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TLS operates between which layers?
L4 and L7 (between Transport and Application)
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Which of these is NOT a valid IP version?
IPv5
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Default gateway is?
Router IP that handles traffic destined outside the local network
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Which command tests network connectivity in Linux?
ping
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netstat -an command shows?
All active network connections and listening ports with numeric addresses
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ss command in Linux replaces?
netstat command for showing socket statistics
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Which command shows routing table in Linux?
route -n / ip route show
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iptables in Linux is used for?
Firewall rules for packet filtering and NAT
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nftables replaces which Linux tool?
iptables (newer, unified framework)
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tcpdump is used for?
Capturing and analyzing network packets at command line
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Which command shows disk usage in Linux?
df -h (disk free) and du -sh (disk usage)
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free -h in Linux shows?
Memory (RAM and swap) usage in human-readable format
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Which Linux command compresses files using gzip?
gzip file / tar -czf archive.tar.gz
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crontab -e opens?
User's cron job editor for scheduling recurring tasks
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Which Linux command changes file ownership?
chown user:group file
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Which shortcut in Linux terminal clears the screen?
Ctrl+L (or 'clear' command)
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How many Kilobytes in a Megabyte?
1024
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How many bits in a byte?
8
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The term 'bug' in computing refers to?
Error or flaw in software/hardware causing malfunction
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Debugging is the process of?
Finding and fixing errors in computer programs
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Computer Fundamentals → Memory Units 1

Stress testing differs from load testing in?
Stress testing goes beyond peak load to find breaking point
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Computer Fundamentals → Internet Basics 2

Which protocol uses port 25 for email transmission?
SMTP
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Which DNS record prevents email spoofing by listing authorized mail servers?
SPF TXT record
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Computer Fundamentals → Number System 2

1 Nibble equals how many bits?
4
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How many bytes in a Kilobyte (binary)?
1024
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