Indian Railways Apperenticeship Interview Questions and Answers

Software development life cycle is a process of planning, designing, developing, testing, and deploying software.

• SDLC is a framework that guides the development of software.

• It involves several stages such as planning, designing, coding, testing, and deployment.

• Each stage has its own set of activities and deliverables.

• The stages are often iterative, meaning they may be repeated until the desired outcome is achieved.

• Exam...read more

DBMS queries are used to interact with a database. Common queries include select, delete, insert, update, and drop.

• SELECT: Retrieves data from a database table

• DELETE: Removes data from a database table

• INSERT: Adds new data into a database table

• UPDATE: Modifies existing data in a database table

• DROP: Deletes an entire database table

Studio.h is a header file in C programming used for input/output operations.

• Studio.h contains functions like printf() and scanf() for input/output operations.

• Preprocessor directives like #define and #include are used to include the header file.

• Studio.h is part of the standard C library and is included in most C compilers.

• It is important to include the header file in your program if you plan to use input/output function

TCS is a leading global IT services company with a strong reputation for innovation and client satisfaction.

• TCS has a proven track record of delivering high-quality IT solutions to clients worldwide.

• TCS offers a wide range of services and solutions, including consulting, digital transformation, and business process outsourcing.

• TCS has a strong focus on innovation and invests heavily in research and development.

• TCS has ...read more

Hashmap is a data structure that stores key-value pairs and uses hashing to retrieve values quickly.

• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which is resolved using separate chaining or open addressing.

• Retrieving a value from a hashmap has an average time complexity of O(1), but worst case can be O(n).

• Examples of hashmap implementatio...read more

Singleton pattern fails when it violates SOLID principles or when multiple instances are required.

• Singleton pattern can make testing difficult as it tightly couples the code

• It can also lead to global state and make the code harder to reason about

• If multiple instances are required, Singleton pattern cannot be used

• In a distributed system, Singleton pattern can lead to synchronization issues

• If the Singleton class is not t...read more

getch() is a function in C that reads a single character from the keyboard without echoing it.

• getch() is defined in the header file.

• It is commonly used to read single characters for menu selection or password input.

• The character read by getch() is not displayed on the screen.

• getch() is a blocking function, meaning it waits for user input before proceeding.

• Example: char ch = getch();

Polymorphism is the ability of an object to take on many forms. In Java, it is achieved through method overriding and interfaces.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• Method overriding is when a subclass provides its own implementation of a method that is already defined in its superclass.

• Interfaces allow for polymorphism by defining a set of methods that a clas...read more

POST and GET are HTTP methods used to send data to a server. POST is used to send data in the request body while GET sends data in the URL.

• POST is more secure as it doesn't expose data in the URL

• GET has a limit on the amount of data that can be sent

• POST is used for submitting forms, uploading files, etc.

• GET is used for fetching data from the server

• Examples: POST - submitting a login form, GET - fetching search results