IT Interview Questions & Answers 2026 | UniqJobs

Question 1

What is the difference between JDK, JRE, and JVM?

Accepted Answer

JDK is the development kit that includes tools to develop Java programs. JRE is the runtime environment needed to run Java applications. JVM (Java Virtual Machine) is the abstract machine that executes Java bytecode and provides platform independence.

Question 2

What is Spring Boot and why is it used?

Accepted Answer

Spring Boot is an extension of the Spring framework that simplifies the configuration and deployment of Spring applications. It provides auto-configuration, embedded servers, and a production-ready setup.

Question 3

What is a REST API and what are its HTTP methods?

Accepted Answer

REST API is an architectural style for networked applications. HTTP methods include GET (retrieve), POST (create), PUT (update), PATCH (partial update), and DELETE (remove).

Question 4

What is Docker and why is it important for DevOps?

Accepted Answer

Docker is a containerization platform that packages applications and their dependencies into isolated containers, ensuring consistent environments across development, testing, and production.

Question 5

What is the difference between SQL and NoSQL databases?

Accepted Answer

SQL databases are relational and use structured schemas (MySQL, PostgreSQL). NoSQL databases are non-relational and flexible in schema, used for large-scale unstructured data (MongoDB, Redis, Cassandra).

Question 6

What is CI/CD in DevOps?

Accepted Answer

CI (Continuous Integration) automates code integration and testing. CD (Continuous Deployment/Delivery) automates code deployment to production, enabling faster and more reliable software releases.

Question 7

What are Python's key features for data engineering?

Accepted Answer

Python supports libraries like Pandas, PySpark, and SQLAlchemy for data manipulation; Apache Airflow for workflow orchestration; and integrates with Hadoop and Kafka — making it primary language for data engineering.

Question 8

What is Kubernetes and how does it differ from Docker?

Accepted Answer

Docker creates and runs containers. Kubernetes is a container orchestration platform that automates deployment, scaling, and management of multiple containers across machine clusters.

Question 9

How does UniqJobs provide placement assistance?

Accepted Answer

UniqJobs provides end-to-end placement support: resume building, LinkedIn profile optimization, mock interviews, job referrals to partner companies, and dedicated placement drives.

Question 10

What salary can a fresher expect after completing an IT course?

Accepted Answer

Freshers from UniqJobs typically start at ₹3–6 LPA. Java/Python Full Stack developers average ₹4–7 LPA. DevOps engineers start at ₹5–8 LPA. Data engineers can expect ₹5–10 LPA at entry level.

IT Interview Questions & Answers | UniqJobs