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 37

HashMap in Java provides?
Unsorted key-value pairs with O(1) average get/put
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Which exception handling block always executes?
finally
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Java 8 introduced?
Lambda expressions, Stream API, Optional
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Singleton pattern ensures?
Only one instance of a class exists throughout the application
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SSH uses which port?
22
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DNS uses which port?
53
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DHCP uses which ports?
67 and 68
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HTTP default port is?
80
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HTTPS uses which port?
443
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FTP uses which ports?
20 and 21
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SMTP uses which port?
25
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Which protocol provides time synchronization?
NTP (Network Time Protocol)
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LinkedIn is owned by?
Microsoft
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Which is NOT a programming language?
HTML
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Assembler converts?
Assembly language to machine code (object code)
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Linker combines?
Object files and libraries into a single executable
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Which flowchart shape represents input/output?
Parallelogram
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Which data structure is used for breadth-first search?
Queue (FIFO)
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Which searching algorithm works on unsorted data?
Linear (sequential) search
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Abstraction in OOP means?
Hiding implementation details, exposing only essential interfaces
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Constructor in OOP is called?
Automatically when a new object is created
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Static method in OOP belongs to?
The class itself — called without creating an object
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TreeMap in Java?
Sorted key-value pairs (sorted by key in natural or custom order)
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Strategy pattern allows?
Algorithm family to be defined and interchangeable at runtime
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Which cloud service model gives most control to customer?
IaaS
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Kubernetes kubectl is?
Command-line tool for interacting with Kubernetes clusters
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Which Kubernetes object exposes application externally as LoadBalancer?
LoadBalancer Service
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Helm chart is?
Package of pre-configured Kubernetes resource definitions
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OpenTelemetry provides?
Unified standard for traces, metrics, and logs collection
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RabbitMQ implements which protocol?
AMQP (Advanced Message Queuing Protocol)
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Aadhaar biometric system uses?
10 fingerprints, 2 iris scans, and photograph
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UPI was developed by?
NPCI (National Payments Corporation of India)
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RS-CIT stands for?
Rajasthan State Certificate in Information Technology
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RKCL stands for?
Rajasthan Knowledge Corporation Limited
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e-Mitra kiosks in Rajasthan provide?
Multiple government services at single point to citizens
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DigiLocker is?
Cloud-based document storage for authentic government documents
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CERT-In is under?
Ministry of Electronics and Information Technology (MeitY)
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Computer Fundamentals → Internet Basics 2

Which protocol enables email clients to download messages?
POP3 and IMAP
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Which is the most popular search engine globally?
Google
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Computer Fundamentals → Memory Units 1

Which Indian institution built PARAM 8000 supercomputer?
C-DAC (Centre for Development of Advanced Computing)
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