Infosys Trainee Interview Questions and Answers

Q1. What is oops?
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OOP (Object-Oriented Programming) is a programming paradigm based on objects that encapsulate data and behavior.
• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class using properties and methods of an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present the same interface for diffe...read more
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Q2. What is index in sql?
Ans. 
An index in SQL is a database object that improves the speed of data retrieval operations on a table.
• Indexes are created on columns to enhance query performance.

• Example: CREATE INDEX idx_name ON employees(name);

• They work like a book's index, allowing quick access to data.

• Indexes can be unique, ensuring no duplicate values in a column.

• Example: CREATE UNIQUE INDEX idx_email ON users(email);

• While they speed up reads, inde...read more
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Q3. What is polymorphism?
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Polymorphism is a programming concept allowing objects to be treated as instances of their parent class, enabling method overriding.
• Polymorphism allows methods to do different things based on the object it is acting upon.

• Example: A function that takes a base class reference can call overridden methods in derived classes.

• Types of polymorphism: Compile-time (method overloading) and runtime (method overriding).

• Example of ...read more
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Good coding exam. Quite difficult.

Q1. About yourself and expectations
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Reasoning, maths, vocabulary, quant mcq questions

Last semester project file and implementation details.

Q1. Tell me about yourself weaknesses and strengths
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Q2. CV related questions
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Basic knowledge of all areas required.

Q1. All the main subjects of cs and it.
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It was good, to be frank it was more than medium level difficult , few questions were very hard. To crack infosys job you should be very good at quant and English.