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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 40

Hybrid cloud combines?
Public and private cloud
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Multi-cloud strategy uses?
Multiple services from one vendor
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Object storage vs block storage: object storage is best for?
Unstructured data like images/videos
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Which is Amazon's object storage service?
S3
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CDN reduces latency by?
Storing content copies geographically closer to users
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Stateless application means?
Application doesn't store session state between requests
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Containerization packages?
Application with all dependencies in isolated container
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Docker image is?
A read-only template for creating containers
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Docker container is?
A running instance of an image
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Kubernetes Pod is?
Smallest deployable unit containing one or more containers
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Service mesh in microservices handles?
Inter-service communication, load balancing, security
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Observability in DevOps includes?
Metrics, logging, and tracing
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MTTR stands for?
Mean Time To Recover
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MTBF stands for?
Mean Time Between Failures
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SLA stands for in IT services?
Service Level Agreement
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Uptime of 99.9% ('three nines') allows how much downtime per year?
About 8.76 hours
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Which algorithm is used in public key cryptography?
RSA
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Elliptic Curve Cryptography (ECC) compared to RSA?
Stronger with smaller key size
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Diffie-Hellman is used for?
Secure key exchange over public channel
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Perfect Forward Secrecy (PFS) means?
Compromise of long-term key doesn't compromise past session keys
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Which is the fastest sorting algorithm in average case?
Quick sort
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Amortized time complexity is?
Average time per operation over sequence of operations
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Space complexity of merge sort is?
O(n)
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Quick sort worst case (sorted array with naive pivot) is?
O(n²)
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Fibonacci series: F(n) = F(n-1) + F(n-2). What is F(6) (starting F(0)=0,F(1)=1)?
8
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Which data structure represents hierarchical data?
Tree
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AVL tree is a?
Self-balancing BST
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B-tree is primarily used in?
Database indexing and file systems
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Red-Black tree is a?
Self-balancing BST with color properties
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Trie data structure is used for?
String storage and prefix searching
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Which is NOT a graph traversal algorithm?
Quick sort
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Dijkstra's algorithm finds?
Shortest path from source to all vertices
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Dijkstra's algorithm works correctly for?
Graphs with non-negative weights
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Bellman-Ford handles?
Negative weights (detects negative cycles)
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Minimum spanning tree connects all vertices with?
Minimum total edge weight
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Prim's and Kruskal's algorithms find?
Minimum spanning tree
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Topological sort is applicable to?
Directed Acyclic Graphs (DAGs)
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Floyd-Warshall algorithm finds?
All-pairs shortest paths
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Binary heap supports which operations efficiently?
Insert in O(log n), extract-min/max in O(log n)
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Hashing collision resolution using chaining?
Uses array of linked lists at each bucket
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