2500+ Interview Questions and Answers

Interview questions for Programmer Analyst position

• C# is a programming language used for developing Windows applications

• OOPS concepts include inheritance, encapsulation, abstraction, and polymorphism

• Delegate is a type that represents references to methods with a specific parameter list and return type

• Polymorphism is the ability of an object to take on many forms. Types include compile-time and runtime polymorphism

• Out and ref keywords are used for passing arguments by referenc...read more

Fix syntax and logical errors in maxReplace function

• Change 'o' to '0' in second for loop

• Replace sum with inputList[i] in second for loop

• Add a condition to check if inputList[i] is greater than sum in second for loop

• Print sum instead of inputList[i] in third for loop

Quality refers to the degree of excellence or superiority of a product or service.

• Quality is subjective and can vary depending on the customer's expectations.

• It can be measured through various metrics such as defect rate, customer satisfaction, and reliability.

• For example, a high-quality car would have a low defect rate, high customer satisfaction, and be reliable.

• Quality is important for customer loyalty and brand reputation.

• Continuous improvement is necessary to maintain an...read more

Calculate the time taken by a train to pass through a tunnel given its speed, length, and the tunnel's length.

• Convert the speed of the train from mph to miles per minute.

• Calculate the time taken by the front of the train to enter the tunnel.

• Calculate the time taken by the rear of the train to exit the tunnel.

• Subtract the time taken by the front from the time taken by the rear to get the total time taken.

• Add the units to the final answer.

Stack is a data structure that follows LIFO (Last In First Out) principle. Converting a queue to stack requires dequeuing and pushing elements.

• Stack is a collection of elements with two main operations: push and pop.

• Push adds an element to the top of the stack, while pop removes the top element.

• Converting a queue to stack requires dequeuing all elements and pushing them onto a stack.

• Example: Queue: 1-2-3-4-5, Stack: 5-4-3-2-1

I would apologize for the delay and offer a solution or compensation.

• Acknowledge the inconvenience caused to the customer

• Explain the reason for the delay and assure them that steps are being taken to resolve it

• Offer a solution or compensation to make up for the delay

• Maintain open communication with the customer throughout the process

Java Developer interview questions covering array list, linkedlist, hashmap, synchronization, abstract vs interface, singleton class, Spring framework, database configuration, and Java 8 features.

• ArrayList and LinkedList differ in terms of implementation, performance, and usage

• HashMap uses hashing to store and retrieve key-value pairs

• Synchronized is used to ensure thread safety and prevent race conditions

• Abstract classes cannot be instantiated and can have both abstract and n...read more

The logic of the program is to reverse a given string word by word without using any built-in function.

• Split the string into an array of words using whitespace as the delimiter.

• Iterate through the array of words in reverse order.

• Append each word to a new string, separated by a space.

BPO stands for Business Process Outsourcing. Insurance refers to a contract between an individual and an insurance company.

• BPO involves outsourcing non-core business functions to a third-party provider

• Insurance is a means of protection against financial loss

• Types of insurance include life, health, auto, and property insurance

• Insurance companies collect premiums from policyholders and use the funds to pay out claims

• BPO services can be used in the insurance industry for tasks s...read more

Breach is a violation of a contract. It can result in legal action and damages.

• Breach occurs when one party fails to fulfill their obligations under a contract.

• It can be a material breach, which is a serious violation, or a minor breach.

• If a breach occurs, the non-breaching party can seek legal action and damages.

• For example, if a contractor fails to complete a project on time, the client may sue for damages.

• If an employee breaches a non-compete agreement, the employer may se...read more

I am proficient in multiple programming languages including Java, Python, and C++.

• Proficient in Java, Python, and C++

• Experience with web development languages such as HTML, CSS, and JavaScript

• Familiarity with scripting languages like Bash and PowerShell

• Knowledge of database languages like SQL and NoSQL

• Comfortable with object-oriented programming and design patterns

Spark plug ignites the fuel-air mixture in diesel engine to start combustion process.

• Spark plug creates a spark to ignite the fuel-air mixture in the combustion chamber

• This starts the combustion process which powers the engine

• Diesel engines usually have glow plugs to preheat the combustion chamber for easier ignition

The choice between 'call' and 'apply' in JavaScript depends on whether you have the arguments as an array or as individual parameters.

• Use 'call' when you have the arguments as individual parameters.

• Use 'apply' when you have the arguments as an array.

• Both 'call' and 'apply' allow you to invoke a function with a specific 'this' value.

Interview questions on SQL and ETL testing

• Row_Number, Rank, and Dense Rank are used for ranking and ordering data in SQL

• Defects/Bugs can be classified into different stages such as Open, In Progress, Resolved, Closed, etc.

• Schema objects are database objects such as tables, views, indexes, etc.

• Different types of loads in ETL Testing include Full Load, Incremental Load, and Delta Load

• Junk Dimension is a dimension table that contains low cardinality columns

• SQL to remove duplicat...read more

Answers to common questions related to APIs, API management, and Apigee Edge

• API stands for Application Programming Interface and is a set of protocols and tools for building software applications

• APIs are popular because they allow different software systems to communicate and share data with each other

• API management involves the process of creating, publishing, documenting, and analyzing APIs

• Apigee Edge is an API management tool that provides features such as security, analyt...read more

The number of staging, dimension and fact tables in source and target systems need to be compared.

• Compare the number of staging, dimension and fact tables in source and target systems.

• Check if the table names and column names are consistent in both systems.

• Verify if the data types and data values are matching in both systems.

• Ensure that the ETL process is properly mapping the data from source to target systems.

• Perform data profiling to identify any discrepancies between the s...read more

1. Cut cake in 8 pieces in minimum cuts. 2. Make 4 equilateral triangles using 6 matchsticks.

• 1. Cut cake in half horizontally and vertically. Cut each quarter diagonally.

• 2. Use 3 matchsticks to form a triangle. Use the other 3 to connect the centers of each triangle.

• Both puzzles require creative thinking and problem-solving skills.

Answering questions related to OOP characteristics, polymorphism, and programming projects.

• OOP characteristics include inheritance, encapsulation, abstraction, and polymorphism.

• Abstraction is the process of hiding implementation details while encapsulation is the process of hiding data.

• Types of polymorphism include compile-time and runtime polymorphism.

• Projects mentioned in CV were discussed and explained.

• A program to find prime factors of a number can be written using a loop...read more

Java is platform independent due to its bytecode and JVM.

• Java code is compiled into bytecode which is platform-independent.

• JVM (Java Virtual Machine) interprets the bytecode and executes it on any platform.

• This eliminates the need for recompilation of code for different platforms.

• For example, a Java program compiled on Windows can run on Linux or Mac without any changes.

• This makes Java highly portable and flexible.

I have knowledge of the US healthcare system and its regulations.

• I am aware of the Affordable Care Act (ACA) and its impact on the healthcare industry.

• I understand the role of insurance companies and government programs like Medicare and Medicaid.

• I know about the various healthcare providers such as hospitals, clinics, and private practices.

• I am familiar with the electronic health record (EHR) system and its importance in healthcare.

• I have knowledge of healthcare data managem...read more

Structures are value types while classes are reference types.

• Structures are allocated on stack while classes are allocated on heap.

• Structures do not support inheritance while classes do.

• Structures cannot have explicit parameterless constructors while classes can.

• Structures are used for small data structures while classes are used for larger, more complex objects.

• Example of structure: struct Point { int x, y; }

• Example of class: class Person { string name; int age; }

Answering questions related to programming language Python.

• I am familiar with Python programming language.

• Datasets in Python include NumPy, Pandas, and SciPy.

• List is mutable while Tuple is immutable in Python.

• Program to find number of white spaces in a given string: def count_spaces(string): return string.count(' ')

• While loop executes a block of code as long as the condition is true, for loop executes a block of code for a specific number of times.

The frog will require 98 jumps to get out of the well.

• The frog jumps 2m high but falls down 1m, so it covers a net distance of 1m with each jump.

• To calculate the number of jumps, we need to subtract the initial jump of 2m from the total depth of the well (100m).

• The remaining distance to cover is 100m - 2m = 98m.

• Since the frog covers 1m with each jump, it will require 98 jumps to cover the remaining distance and reach the top of the well.

To get the count of all text boxes in a web page, we can use Selenium's findElements() method with the input type 'text'.

• Use Selenium's findElements() method to find all elements with the input type 'text'

• Count the number of elements returned by the findElements() method

• Return the count as the result

Use SQL JOIN to fetch common records from two tables.

• Use SQL JOIN to combine the two tables based on a common column (e.g. student ID).

• Select the columns you want to retrieve from both tables.

• Use the WHERE clause to filter out the records that are common between the two tables.

Yes, I am aware of the formulas used in Excel.

• I am familiar with basic formulas such as SUM, AVERAGE, MAX, MIN, etc.

• I also know how to use more complex formulas such as VLOOKUP, IF statements, and nested functions.

• I am comfortable with creating and using named ranges, and using functions with cell references.

• I am also familiar with using Excel's built-in functions for statistical analysis and financial calculations.

• Overall, I am confident in my ability to use Excel to perform...read more

Technical Lead interview questions on computer system validation, documentation, security policy, data integrity, GAMP5, risk assessment, backup and restoration, software categories, and more.

• Types of documentation for computer system validation

• Recent/current software execution and computer system validation

• Security policy for GxP computerization system

• Traceability matrix and its purpose

• ALCOA and ALCOA+ principles

• Definition and importance of data integrity

• Regulatory points fo...read more

RDBMS is a type of DBMS that uses a relational model to store and manage data.

• DBMS is a general term for any software that manages data

• RDBMS uses tables with rows and columns to store data

• RDBMS enforces relationships between tables using keys

• Example: MySQL, Oracle, SQL Server

• Example of a database: a customer database for a retail store

Code to print prime numbers in right angle triangle format.

• Create a function to check if a number is prime or not.

• Use nested loops to print the numbers in right angle triangle format.

• Start with the first prime number and keep adding prime numbers to the triangle.

• Example: 2 3 5 7 11 13 17 19 23 29

Data structures are ways to organize and store data. Two examples are arrays and linked lists.

• Arrays are a collection of elements of the same data type, stored in contiguous memory locations.

• Linked lists are a collection of nodes, each containing data and a reference to the next node in the list.

Divide 1 kg cake equally among 8 people in 3 cuts.

• Cut the cake into 8 equal pieces using 2 cuts.

• Stack the pieces and cut them in half using the third cut.

• Distribute the 16 pieces among 8 people.

Interview questions for Software Engineer position

• Describe recent project and technologies used

• Explain dependency injection and differences between Rest and Soap

• Differentiate Monolithic and Microservice architecture

• List features of Java 8 and write programs using Java 8

• Provide pseudo code for sorting a list of integers without using Java 8 sort method

• Define functional interface and its annotation

The primary feature to test in a train booking system would be the booking process.

• Test the ability to search for available trains and seats

• Test the ability to select and reserve seats

• Test the payment process

• Test the confirmation and ticket generation process

Method and Function are both blocks of code that perform a specific task, but the main difference is that a method is associated with an object while a function is not.

• A method is called on an object, while a function is called independently.

• A method can modify the state of an object, while a function cannot.

• A method is defined within a class, while a function is defined outside of a class.

• Example of a method: object.methodName()

• Example of a function: functionName()

This interview question covers various topics including programming, design patterns, data structures, and exception handling in Java.

• Write a program to generate the Fibonacci series

• Write a program using boolean variables

• Explain the ClassCastException and how to handle it

• Discuss the Singleton design pattern and its implementation with different JDK versions

• Explain abstract classes and interfaces in your current project

• Explain hashing in HashMap and the number of buckets

• Differ...read more

A function is a block of code that performs a specific task and can be called multiple times.

• Functions help in modularizing code and making it reusable.

• Functions can take parameters and return values.

• Functions can be defined in different ways such as function declaration, function expression, arrow function, etc.

• Examples of functions include Math.max(), console.log(), and document.getElementById().

Program to check if a given string is palindrome or not using two pointers approach.

• Initialize two pointers, one at the start and one at the end of the string.

• Compare the characters at both pointers and move them towards each other until they meet.

• If all characters match, the string is a palindrome.

• If any character doesn't match, the string is not a palindrome.

Class is a blueprint for creating objects, encapsulation is the process of hiding data and methods within a class.

• Class is a template or blueprint that defines the properties and behaviors of an object.

• Encapsulation is the process of bundling data and methods together within a class, hiding the internal details from the outside world.

• Other features of OOP include inheritance, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and methods from anoth...read more

Union combines the result sets of two or more SELECT statements, while Union All combines all rows from two or more SELECT statements.

• Union removes duplicate rows, while Union All does not.

• Union requires the number and order of columns in all SELECT statements to be the same, while Union All does not have this requirement.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM table1 UNION ALL SELECT column1 FROM table2;

Interview questions for Programmer Analyst role

• Explained automation framework used in the project

• Differentiated between Smoke, Sanity & Regression testing

• Answered scenario-based questions

• Discussed defect severity vs priority

• Explained BDD and Cucumber

• Answered basic questions on Selenium

At landing and staging area, I will perform data validation to ensure accuracy and completeness of data.

• Validate data against source system

• Check for missing or duplicate data

• Verify data types and formats

• Ensure data integrity and consistency

• Perform data profiling and data quality checks

Answering Salesforce Marketing Cloud Developer interview questions

• To bypass validation rule for a particular profile, use the $Profile global variable in the rule formula

• To update contact record upon account update, write a trigger on Account object and update related Contact records

• To fetch contact records without account, use SOQL query with LEFT JOIN on Account object and WHERE clause to filter null values

Program to check if a string starts with 's' and convert it to an array

• Use string method startsWith() to check if the string starts with 's'

• If it starts with 's', use split() method to convert it into an array

• Loop through the array and print each element

There are various algorithm methods in machine learning, such as supervised learning, unsupervised learning, and reinforcement learning.

• Supervised learning: Algorithms learn from labeled data to make predictions or classifications.

• Unsupervised learning: Algorithms learn from unlabeled data to discover patterns or relationships.

• Reinforcement learning: Algorithms learn through trial and error to maximize rewards.

• Other methods include semi-supervised learning, transfer learning,...read more

Object storage stores data as objects while block storage stores data as blocks.

• Object storage is ideal for unstructured data like images, videos, and documents.

• Block storage is ideal for structured data like databases and virtual machines.

• Object storage uses unique identifiers to access data while block storage uses block addresses.

• Object storage is more scalable and cost-effective than block storage.

• Examples of object storage include Amazon S3 and Google Cloud Storage while...read more

NDAs/CDAs are legal agreements that protect confidential information shared between parties.

• NDAs/CDAs stand for Non-Disclosure Agreements/Confidentiality Disclosure Agreements.

• They are used to protect sensitive information from being disclosed to unauthorized parties.

• The clauses in NDAs/CDAs typically include definitions of confidential information, obligations of the parties involved, duration of the agreement, and remedies for breach.

• Examples of clauses in NDAs/CDAs include...read more

To remove redundancy in a database with repeated names, use normalization techniques.

• Identify the primary key of the table and ensure it is unique

• Create separate tables for related data to avoid repeating information

• Use foreign keys to link related tables

• Consider using indexing to improve performance

• Update existing data to conform to the new structure

Interview questions for Project Associate position covering OOPS concepts, MVC, ADO.NET, and SQL.

• Four pillars of OOPS: Abstraction, Encapsulation, Inheritance, Polymorphism

• Abstract class: Cannot be instantiated, can have abstract and non-abstract methods

• Interfaces: Contract that defines a set of methods, can be implemented by classes

• Finalize method: Called by garbage collector before object is destroyed

• Dispose method: Used to release unmanaged resources, should be called expl...read more

To select uncommon records that do not match, use the NOT IN or NOT EXISTS clause in SQL.

• Use the NOT IN clause to select records that do not match a specific list of values.

• Use the NOT EXISTS clause to select records that do not have a matching record in a subquery.

• Example: SELECT * FROM table_name WHERE column_name NOT IN (value1, value2);

• Example: SELECT * FROM table1 WHERE NOT EXISTS (SELECT * FROM table2 WHERE table1.id = table2.id);

Answers to technical interview questions on Java programming language.

• To display most frequent element in an array using Streams and Lambda expression, use Collectors.groupingBy() and Collectors.counting() methods.

• ArrayList is an ordered collection of elements while HashSet is an unordered collection of unique elements.

• Default methods in interface are used to provide a default implementation of a method that can be overridden by implementing classes.

• StringBuffer is synchroniz...read more

Interview questions for Senior Associate position in ETL Testing

• Different types of schemas in ETL

• Examples of slowly changing dimensions

• Layers of ETL Testing and questions related to Staging layers

• Types of reports and dashboard for report testing

• Handling P1 defects in defect cycle

• SQL queries with different scenarios

To change region of deployed AWS EC2 instance, create an AMI of the instance and launch it in the desired region.

• Create an AMI of the instance in the current region

• Copy the AMI to the desired region

• Launch the copied AMI in the desired region

The 4 pillars of OOP are Abstraction, Encapsulation, Inheritance, and Polymorphism.

• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and functions together to prevent external interference.

• Inheritance: Creating new classes from existing ones, inheriting properties and methods.

• Polymorphism: Using a single interface to represent multiple types of objects.

OOPS Concepts, Fibonacci Series, Factorial, Call by value/reference, Abstraction, Encapsulation, Polymorphism, Switch, Router, Hub, OSI Model

• OOPS Concepts include inheritance, polymorphism, encapsulation, and abstraction

• Example of Fibonacci Series program: int fib(int n) { return (n <= 1) ? n : fib(n-1) + fib(n-2); }

• Example of Factorial program: int fact(int n) { return (n == 1 || n == 0) ? 1 : n * fact(n-1); }

• Call by value passes a copy of the variable, while call by referen...read more

The question asks for SQL queries for joining three tables, sorting in descending order in C program, and printing 'Hello, World!' in C.

• To join three tables in SQL, use the JOIN keyword with appropriate conditions.

• To sort in descending order in C, use the qsort() function with a custom comparison function.

• To print 'Hello, World!' in C, use the printf() function with the desired message.

Variables are names given to memory locations while objects are instances of a class with attributes and methods.

• Variables are used to store values while objects are used to represent real-world entities.

• Variables can be reassigned to different values while objects have a fixed identity.

• Variables are created when they are assigned a value while objects are created using constructors.

• Variables can be of different data types while objects are instances of a specific class.

• Examp...read more

To avoid re-rendering, use shouldComponentUpdate or React.memo

• Use shouldComponentUpdate to compare current and next props/state

• Use React.memo to memoize functional components

• Use useMemo to memoize expensive computations

• Use useCallback to memoize event handlers

• Use PureComponent for class components

What is the probability of picking a red ball out of 10 balls with 2 red, 5 blue, and 3 orange?

• There are 2 red balls out of 10 total balls

• The probability of picking a red ball is 2/10 or 1/5

• The probability can also be expressed as 20%

Availability zones and regions are geographical locations in AWS data centers.

• Availability zones are isolated locations within a region that contain their own power, cooling, and networking infrastructure.

• Regions are separate geographic areas that consist of two or more availability zones.

• Each region is completely independent and isolated from the others.

• Customers can deploy resources in multiple availability zones to achieve high availability and fault tolerance.

• Examples of ...read more

Address underperformance of team mate by identifying root cause and providing support.

• Have a conversation with the team mate to understand the root cause of underperformance

• Provide support and resources to help the team mate improve

• Set clear expectations and goals for the team mate

• Monitor progress and provide feedback regularly

• Consider involving a supervisor or HR if the issue persists

I rate my programming skills at 8 out of 10.

• I have experience in multiple programming languages such as Java, Python, and C++.

• I have completed several projects including a web application and a mobile app.

• I am constantly learning and improving my skills through online courses and personal projects.

One apple is still left in the basket because one of the people in the room is the owner of the basket and did not take an apple.

• One person in the room is the owner of the basket

• The owner did not take an apple

• Hence, one apple is still left in the basket

S3 is a cloud-based object storage service provided by Amazon Web Services (AWS).

• S3 stands for Simple Storage Service.

• It allows users to store and retrieve data from anywhere on the web.

• S3 offers different storage classes such as Standard, Infrequent Access, and Glacier.

• Standard is for frequently accessed data, Infrequent Access is for data that is accessed less frequently, and Glacier is for long-term archival storage.

• S3 also provides features like versioning, lifecycle poli...read more