UBS ENO Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Easy

The first round was the tech round in which firstly I was asked about things on my resume (e.g. I had done a course in Embedded Systems, so the interviewer asked me in which language I was made to code etc.) Then, I was asked a programming question and some OOPS based questions.

Q1. 
Find Missing Number In String Problem Statement
You have a sequence of consecutive nonnegative integers. By appending all integers end-to-end, you formed a string S without any separators. During this pro...read more
Ans. 
Given a string of consecutive nonnegative integers with one missing number, find the missing integer.
• Iterate through all possible substrings and check if they form a valid sequence of consecutive integers.

• If a valid sequence is found, return the missing number.

• Handle cases where there are multiple missing numbers, all numbers are present, or the string is invalid.

• Consider the constraints provided to optimize the soluti...read more
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Q2. Can you explain operator overloading?
Ans. 
Operator overloading allows operators to be redefined for user-defined types.
• Operator overloading allows defining custom behavior for operators like +, -, *, /, etc.

• It is achieved by defining special member functions like operator+(), operator-(), etc.

• For example, overloading the + operator for a custom class to concatenate two objects.
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Q3. What is polymorphism in Java?
Ans. 
Polymorphism in Java allows objects of different classes to be treated as objects of a common superclass.
• Polymorphism is achieved through method overriding and method overloading.

• Method overriding allows a subclass to provide a specific implementation of a method that is already provided by its superclass.

• Method overloading allows multiple methods with the same name but different parameters to coexist in the same class...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with oops based questions. Design based questions and puzzle was also asked.

Q1. What is multithreading in Java?
Ans. 
Multithreading in Java allows multiple threads to execute concurrently, improving performance and responsiveness.
• Multithreading allows multiple tasks to run concurrently within a single program.

• Each thread has its own stack and runs independently, sharing resources like memory.

• Java provides built-in support for multithreading through the Thread class and Runnable interface.

• Example: Creating a new thread using Thread cl
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Q2. How would you design a lift to minimize inconvenience for users?
Ans. 
Design a lift with features like quick response time, spacious interior, clear signage, and emergency communication.
• Ensure quick response time for minimal waiting

• Provide a spacious interior for comfort and ease of movement

• Include clear signage for easy navigation

• Install emergency communication system for safety
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Round duration - 90 minutes
Round difficulty - Easy

The test was a written test with no negative marking!
15 Quantitative analysis and reasoning questions (MCQs). The problems were basic to mid-level CAT. 
Quantitative 7 Puzzles (Subjective)-How to Ace the Brain Teasers book helps
5 Programming questions (Subjective)Algorithm or code in any language was accepted.-Questions were based on String manipulation techniques, Searching-Sorting techniques, anagram. 
1 Bonus question (Subjective)-Client Server Architecture type of question.

Q1. 
Angle Calculation Between Clock Hands
Given a specific time in hours and minutes, your task is to calculate the smallest possible angle between the hour hand and the minute hand of a clock.
Example:
Inp...read more
Ans. 
Calculate the smallest angle between the hour and minute hands of a clock for a given time.
• Calculate the angles formed by the hour and minute hands separately

• Find the absolute difference between the two angles

• Return the smaller angle as the result
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions on OOPS/DBMS etc.

Q1. What are the different types of indexing in DBMS?
Ans. 
Different types of indexing in DBMS include primary, secondary, clustered, non-clustered, unique, and composite indexing.
• Primary indexing: Index based on the primary key of a table.

• Secondary indexing: Index based on a non-primary key column.

• Clustered indexing: Physically rearranges the table's rows based on the indexed column.

• Non-clustered indexing: Creates a separate structure for the index.

• Unique indexing: Ensures th...read more
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Q2. What are the different types of keys in a Database Management System (DBMS)?
Ans. 
Types of keys in a DBMS include primary key, foreign key, candidate key, and super key.
• Primary key uniquely identifies each record in a table (e.g. employee ID)

• Foreign key links two tables together (e.g. department ID in employee table)

• Candidate key is a unique key that can be chosen as the primary key (e.g. email address)

• Super key is a set of attributes that uniquely identifies a record (e.g. combination of first name
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Q3. How do you map an ER diagram to a relational schema?
Ans. 
Mapping an ER diagram to a relational schema involves identifying entities, attributes, relationships, and keys.
• Identify entities in the ER diagram and map them to tables in the relational schema.

• Identify attributes of each entity and map them to columns in the corresponding tables.

• Identify relationships between entities and represent them using foreign keys in the tables.

• Identify keys (primary and foreign) to maintain...read more
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Q4. What are the differences between Procedural Programming and Object-Oriented Programming?
Ans. 
Procedural programming focuses on procedures and functions, while Object-Oriented Programming focuses on objects and classes.
• Procedural programming uses a top-down approach, breaking down tasks into smaller procedures/functions.

• Object-Oriented Programming uses objects that contain data and methods to manipulate that data.

• In procedural programming, data and functions are separate entities, while in OOP, they are encapsu...read more
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on puzzle, programming and Java OOPS based.

Q1. 
Pattern Printing Task
You are tasked with printing a specific pattern based on the given number of rows, 'N'. For any input value of 'N', generate and print a pattern as described in the example.
Input:
...read more
Ans. 
The task is to print a specific pattern based on the given number of rows, 'N'.
• Iterate through each row and print the numbers in the specified pattern

• Start with the first row, then move to the next row in a spiral pattern

• Ensure there is exactly one space between each value in a row
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Q2. What is an abstract class?
Ans. 
An abstract class is a class that cannot be instantiated and is used as a blueprint for other classes to inherit from.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and concrete methods

• Used to define common behavior for subclasses
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Q3. What is a final class in Java?
Ans. 
A final class in Java is a class that cannot be extended or subclassed.
• Final classes are marked with the 'final' keyword in Java.

• Final classes are often used for utility classes or classes that should not be modified or extended.

• Example: 'String' class in Java is a final class.
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Q4. What is the difference between static and non-static methods in Java?
Ans. 
Static methods belong to the class itself, while non-static methods belong to instances of the class.
• Static methods can be called without creating an instance of the class.

• Non-static methods can only be called on an instance of the class.

• Static methods cannot access non-static variables or methods directly.

• Non-static methods can access both static and non-static variables and methods.

• Example: Math.sqrt() is a static me...read more
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Round duration - 60 minutes
Round difficulty - Easy

This was the best round! The director took my interview. It eventually got converted into a technical round.

Q1. Write a program to connect to a backend or database (SQL Server) using C#.
Ans. 
Use C# to connect to a SQL Server backend or database.
• Use SqlConnection class to establish a connection to the SQL Server.

• Use SqlCommand class to execute SQL queries.

• Handle exceptions using try-catch blocks.

• Remember to close the connection after use.
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Q2. What are the advantages of using WCF (Windows Communication Foundation) services?
Ans. 
WCF services provide advantages such as interoperability, security, reliability, and flexibility.
• Interoperability: WCF allows communication between different platforms and technologies.

• Security: WCF supports various security mechanisms like message encryption and authentication.

• Reliability: WCF ensures reliable message delivery through features like reliable messaging.

• Flexibility: WCF supports multiple communication pr...read more
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Q3. What is an APK file?
Ans. 
An APK file is a package file format used for distributing and installing applications on Android devices.
• APK stands for Android Package Kit

• Contains all the necessary files for an Android app to be installed on a device

• Can be downloaded from app stores like Google Play or third-party websites
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Q4. What is API Level in Android?
Ans. 
API Level in Android is a unique integer value assigned to each version of the Android platform.
• API Level determines the Android framework API features available to an app.

• Developers specify the minimum API Level required for their app to run.

• Higher API Levels offer more features but may limit app compatibility with older devices.

• For example, Android 11 has API Level 30.
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.