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

Dropout regularization in neural networks?
Randomly deactivates neurons during training to prevent overfitting
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CNN (Convolutional Neural Network) is specialized for?
Processing grid-like data such as images
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RNN (Recurrent Neural Network) processes?
Sequential data with memory of previous inputs
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BERT is pre-trained using?
Masked Language Modeling (MLM) and Next Sentence Prediction (NSP)
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Precision in ML classification is?
TP/(TP+FP) — of all predicted positive, how many are actually positive
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Recall (Sensitivity) is?
TP/(TP+FN) — of all actual positives, how many were correctly identified
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K-fold cross-validation?
K folds — train on K-1, validate on 1, repeat K times
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Random forest is ensemble of?
Decision trees trained on random subsets with feature randomness
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XGBoost is based on?
Gradient boosted decision trees with regularization
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ACID vs BASE: BASE means?
Basically Available, Soft-state, Eventually consistent
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ETL stands for?
Extract, Transform, Load
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Star schema in data warehouse has?
Central fact table surrounded by dimension tables
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OLAP vs OLTP: OLAP is for?
Analytical queries on large datasets (data warehousing)
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Elasticsearch is primarily used for?
Full-text search and log analytics
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SLA stands for?
Service Level Agreement
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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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99.9% uptime (three nines) allows how much downtime per year?
About 8.76 hours
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High availability refers to?
System designed to minimize downtime with redundancy
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Disaster Recovery RPO stands for?
Recovery Point Objective — maximum acceptable data loss
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RTO in disaster recovery?
Recovery Time Objective — maximum time to restore service
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Which Python web framework is full-featured?
Django
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Node.js enables?
JavaScript on server-side via V8 engine and event loop
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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 a Docker image
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Kubernetes Pod is?
Smallest deployable unit containing one or more containers
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Kubernetes Deployment ensures?
Desired number of pod replicas are always running
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CI/CD stands for?
Continuous Integration/Continuous Deployment
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Git command to stage files for commit?
git add
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Git command to download remote changes?
git fetch or git pull
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GitHub Pull Request allows?
Code review before merging into main branch
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User Story format is?
As a [user], I want [feature], so that [benefit]
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Technical debt refers to?
Cost of shortcuts and poor design choices that need future rework
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TDD (Test-Driven Development) workflow?
Write failing test, write code to pass, refactor
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Which HTTP method is idempotent but NOT safe?
PUT
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HTTP/2 improvements over HTTP/1.1?
Binary framing, header compression, multiplexing, server push
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GraphQL advantage over REST?
Single endpoint, client specifies exact data needed — no over/under-fetching
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Which tool generates API documentation?
Swagger / OpenAPI specification
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Which is NOT a valid IP version in use?
IPv5
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Subnet mask /24 equals?
255.255.255.0
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