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Top 50 basics Interview Questions

The most frequently asked basics questions across all roles and companies, ranked by real interview frequency. Updated weekly.

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Deep Copy vs Shallow Copy
Easy

Explain shallow vs deep copy in Python, how nested objects behave, and when each approach is appropriate.

memory managementbasicspython
Recently asked
EPAM SystemsSusquehanna International GroupEaton
Linear Search to Binary Search
Easy

Explain how replacing linear search with binary search reduces lookup time from O(n) to O(log n) on sorted data.

time complexitySearchingbasics
Recently asked
TEKsystemsHub GroupJ&B Medical Supply
Swift Structs vs Classes
Easy

Explain Swift structs vs classes, focusing on value vs reference semantics, memory behavior, and when each is the better design choice.

swiftbasicsoop
Recently asked
Scalable CapitalSamsung AdsTelus Digital Ai Data Solutions
Linear Data Structures Fundamentals
Easy

Explain core data structure concepts and compare arrays, linked lists, stacks, and queues with their operations and complexity.

linear data structuresbasicsData Structures
Recently asked
AccentureTennecoCloud Software Group
Python Memory Management and GC
Medium

Explain Python reference counting, cyclic garbage collection, and how memory is reclaimed.

memory managementbasicspython
Recently asked
TensorIoTSusquehanna International GroupFutures First
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Key Constraints in Relational Databases
Easy

Explain how primary key, foreign key, and unique key constraints differ and how they enforce data integrity in relational databases.

basicssqldata integrity
Recently asked
Telus DigitalHashedInThe Lasalle Network
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