IBM, headquartered in Armonk, New York, hires freshers in India through a process that usually includes game-based cognitive assessments, a coding and English language test, and technical and HR interviews. These IBM interview questions cover Java, Linux, cloud, containers and AI basics, situational questions and the HR round, with model answers.
20 questions · Updated
Programming, OOP, DBMS, operating systems and your project, the core of most IBM fresher interviews.
ls lists files, cd changes directory, pwd shows the current directory, mkdir creates a directory, cp and mv copy and move files, rm deletes, cat and less show file contents, grep searches text, chmod changes permissions, ps and top show processes, kill stops a process, df and du show disk usage, and tail -f follows a log file. Most servers run Linux, so these are essential.
A monolith is one deployable application containing all features; it is simple to build and test at first but becomes hard to scale and change as it grows.
Microservices split the application into small, independent services, each owning its data and deployed separately, communicating through APIs or messages.
They scale and deploy independently but add complexity in networking, monitoring and data consistency.
Kubernetes is an open-source platform for running containers at scale.
It schedules containers (in pods) across a cluster of machines, restarts failed ones, scales them up or down, balances traffic with services, and rolls out updates without downtime.
You describe the desired state in YAML files and Kubernetes keeps the cluster in that state.
Red Hat OpenShift, from IBM's subsidiary, is an enterprise Kubernetes platform.
Hybrid cloud combines on-premises or private cloud infrastructure with one or more public clouds, managed as one environment.
Organisations keep sensitive data or legacy systems on-premises while using public cloud for scalability and new services.
Containers and Kubernetes make applications portable across these environments.
Hybrid cloud is central to IBM's strategy, especially since it acquired Red Hat in 2019.
Artificial intelligence is the broad field of making machines perform tasks that need human-like intelligence.
Machine learning is a subset where systems learn patterns from data instead of following hand-written rules, such as predicting customer churn.
Deep learning is a subset of machine learning using neural networks with many layers, which powers image recognition, speech and large language models.
Multithreading runs several threads within one program at the same time, making better use of the CPU and keeping applications responsive.
You can extend the Thread class or, preferably, implement Runnable or Callable and run tasks with an ExecutorService thread pool.
Shared data must be protected with synchronized, locks or concurrent collections to avoid race conditions.
ExecutorService pool = Executors.newFixedThreadPool(2);
pool.submit(() -> System.out.println("Task 1 on " + Thread.currentThread().getName()));
pool.submit(() -> System.out.println("Task 2 on " + Thread.currentThread().getName()));
pool.shutdown();SOAP is a protocol that uses XML messages with a strict structure and a WSDL contract, with built-in standards for security and transactions; it is still common in banking and enterprise systems. REST is an architectural style using HTTP methods and URLs, usually with JSON, and is lighter, faster and easier to use, so most modern web and mobile APIs are REST.
Binary search finds a value in a sorted array by comparing it with the middle element and discarding half of the range each time, so it runs in O(log n). Compute the middle as low + (high - low) // 2 to avoid overflow in languages with fixed-size integers.
def binary_search(arr, target):
low, high = 0, len(arr) - 1
while low <= high:
mid = low + (high - low) // 2
if arr[mid] == target:
return mid
if arr[mid] < target:
low = mid + 1
else:
high = mid - 1
return -1A hash table stores key-value pairs in an array, using a hash function to turn each key into an index, so inserting, finding and deleting take O(1) time on average.
Collisions, when two keys map to the same index, are handled by chaining (a list per slot) or open addressing (probing for another slot).
Performance degrades if the hash function is poor or the table is too full, so it is resized as it grows.
A compiler translates the whole program into machine code (or bytecode) before running, reporting errors at compile time, and the result usually runs faster, as in C and C++.
An interpreter translates and runs the program line by line, which makes testing quicker but execution slower, as with traditional Python.
Java compiles to bytecode, which the JVM then interprets and compiles just in time.
Situations at work, attitude and flexibility. Sometimes combined with the technical or HR round.
Acknowledge it quickly, assess the impact, and follow the support process: check monitoring and logs, apply a safe fix or rollback if possible, and escalate to the right people if needed.
Keep the client informed with clear updates.
Afterwards, contribute to a root cause analysis so it does not happen again.
Tell my lead as soon as I realise it, explain why, give a revised estimate and suggest options such as reducing scope or getting help. Early honesty lets the team plan; hiding it until the deadline causes bigger problems.
Mention specific actions: online courses (IBM offers free learning through IBM SkillsBuild), certifications, documentation, side projects and tech communities. Give one recent example and what you built with it.
Use a real example: what they struggled with, how you helped (pairing, explaining, sharing resources) and the result. IBM values collaboration and teamwork.
Do it carefully and consistently, and look for ways to automate it with scripts or tools once you understand it well. For example: "In my internship I automated a daily data export with a Python script, which saved an hour every day."
Questions about IBM, its hiring programmes, relocation, shifts and your plans.
Be specific: "IBM has more than a century of innovation, from mainframes to hybrid cloud and AI with watsonx and Red Hat OpenShift.
It works with large enterprises on critical systems, and it invests strongly in research and learning.
I want to build skills in cloud and AI in a company that shapes how large businesses use technology."
International Business Machines began in 1911 as the Computing-Tabulating-Recording Company and was renamed IBM in 1924.
It is headquartered in Armonk, New York.
Today it focuses on hybrid cloud and AI: software such as Red Hat OpenShift and watsonx, consulting through IBM Consulting, and infrastructure including IBM Z mainframes, which run much of the world's banking transactions.
It also leads research in quantum computing.
IBM has a large workforce in India.
IBM has offices across India and supports global clients. A clear "yes, I am flexible about location and shifts" is what the interviewer wants to hear, with honesty about any genuine constraint.
Link your skills to IBM's focus: "I have strong fundamentals in Java and SQL, I have worked with Docker in my project, and I am completing a cloud certification. I learn quickly, work well in teams and want to grow in cloud and AI, which is exactly where IBM is investing."
Ask about learning or projects: "What kind of projects do freshers in this role usually join?" or "What learning opportunities are available in the first year?"
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