10+ G4S Interview Questions and Answers

CRFS stands for Continuous Randomized Feedback System. It is a method used in clinical trials to collect data from patients.

• CRFS is a way to collect data from patients in clinical trials in real-time.

• It involves randomizing questions and collecting feedback from patients at various intervals.

• The data collected through CRFS can help researchers make informed decisions about the efficacy of a treatment.

• CRFS can be implemented through various methods such as mobile apps, web-bas...read more

An e2e system architecture design for user input to response output

• Identify user requirements and define system goals

• Choose appropriate technologies and frameworks

• Design system components and their interactions

• Ensure scalability, reliability, and security

• Test and validate the system before deployment

Python is a general-purpose language while Node.JS is a JavaScript runtime environment.

• Python is used for web development, data analysis, artificial intelligence, and scientific computing.

• Node.JS is used for building scalable network applications and real-time web applications.

• Python is slower than Node.JS in terms of performance.

• Python has a larger standard library than Node.JS.

• Python is easier to learn and has a simpler syntax than Node.JS.

SQL is a relational database management system while NoSQL is a non-relational database management system.

• SQL databases are table-based while NoSQL databases are document-based, key-value pairs, graph databases, or column-based.

• SQL databases are structured while NoSQL databases are unstructured.

• SQL databases use SQL (Structured Query Language) for querying and managing data while NoSQL databases use different query languages like MongoDB uses JSON-like documents.

• SQL databases...read more

Threads are lightweight processes that enable multitasking within a single process.

• Threads allow multiple tasks to be executed concurrently within a single process.

• They share the same memory space and resources of the parent process.

• Threads can improve performance by utilizing available CPU resources more efficiently.

• Examples include web servers handling multiple requests simultaneously and video games rendering graphics while processing user input.

CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict web pages from making requests to a different domain.

• CORS is used to prevent malicious websites from accessing sensitive data from other websites.

• To handle CORS, the server needs to include specific headers in the response to allow the browser to make requests from a different domain.

• The most common header used to handle CORS is 'Access-Control-Allow-Origin'. It spe...read more

A Reddit-like application for sharing and discussing content

• User authentication and authorization

• Post creation and voting system

• Commenting system

• Subreddit creation and management

• Search functionality

• Real-time updates using websockets

Node.js is a powerful and efficient server-side JavaScript runtime environment.

• Node.js is fast and scalable, making it ideal for building real-time applications.

• It uses an event-driven, non-blocking I/O model, which makes it lightweight and efficient.

• Node.js has a large and active community, with many useful libraries and modules available.

• It allows for easy sharing of code between the server and client, using JavaScript on both sides.

• Node.js is cross-platform, meaning it can...read more

OS processes are instances of a program that are being executed by the operating system.

• Processes are managed by the operating system's scheduler.

• Each process has its own memory space and system resources.

• Processes can communicate with each other through inter-process communication (IPC).

• Examples of processes include web browsers, media players, and text editors.