Foundations of Backend Development and Node.js Basics PDF

Report: Foundations of Backend Development and Node.js Ba- sics You answered 18 out of 20 questions correctly. Multiple choice 1 What is the primary role of backend development? Your answer: Handling server-side logic and database communication Explanation: Backend develop...

Report: Foundations of Backend Development and Node.js Ba- sics You answered 18 out of 20 questions correctly. Multiple choice 1 What is the primary role of backend development? Your answer: Handling server-side logic and database communication Explanation: Backend development focuses on server-side logic and communication with databases, which is essential for application functionality. True or False 2 Node.js is a synchronous programming environment. Your answer: False Explanation: Node.js uses a non-blocking I/O model, allowing it to handle multiple operations concurrently without waiting for each to complete. True or False 3 Express.js is a framework used for frontend development. Your answer: False Explanation: Express.js is a backend framework for building web applications in Node.js.  True or False 4 NPM stands for Node Package Manager and is used for managing packages in Node.js. Your answer: True Explanation: NPM is indeed the package manager for Node.js, allowing developers to manage libraries and dependencies. True or False 5 In Node.js, the event loop is responsible for executing callback functions when events occur. Your answer: True Explanation: The event loop in Node.js listens for events and triggers the associated callback functions when those events occur. Multiple choice 6 Which of the following is NOT a responsibility of backend development? Your answer: Designing the layout of web pages Explanation: Backend development does not involve designing the layout of web pages, which is a frontend responsibility. Multiple choice 7 What is the primary programming language used with Node.js? Your answer: JavaScript Explanation: Node.js is primarily built to execute JavaScript code outside of a web browser.  True or False 8 Node.js can only handle one request at a time due to its single-threaded nature. Your answer: False Explanation: Node.js can handle many concurrent requests efficiently due to its non-blocking I/O model. Open response 9 What is the purpose of the 'require' function in Node.js? Your answer: To obtain functions or objects from a module that has exported objects Explanation: To import modules or libraries into a Node.js application. True or False 10 The 'process' object in Node.js provides information about the current Node.js process. Your answer: True Explanation: The 'process' object allows interaction with the environment in which the Node.js process is running. Multiple choice 11 Which of the following is a feature of Node.js? Your answer: Event-driven programming Explanation: Node.js is known for its event-driven programming model, which allows it to handle asynchro- nous operations efficiently.  Multiple choice 12 What does the 'setTimeout()' function do in Node.js? Your answer: Executes code after a specified delay Explanation: The 'setTimeout()' function is used to execute code after a specified delay. True or False 13 JavaScript is a statically typed language. Your answer: False Explanation: JavaScript is a dynamically typed language, meaning variable types can change during execution. Multiple choice 14 Which of the following is a valid way to declare a constant in JavaScript? Your answer: const pi = 3.14; Explanation: The 'const' keyword is used to declare a constant in JavaScript, which cannot be reassigned. Open response 15 Explain the concept of 'type coercion' in JavaScript. Your answer: No answered provided Explanation: Type coercion is the automatic or implicit conversion of values from one data type to another.  Open response 16 What is the purpose of the 'global' object in Node.js? Your answer: It is accessible everywhere Explanation: To make variables accessible throughout the entire application. Multiple choice 17 Which operator is used for strict equality comparison in JavaScript? Your answer: === (triple equals) Explanation: The '===' operator checks for both value and type equality in JavaScript. Multiple choice 18 What does the 'parseInt()' function do in JavaScript? Your answer: Converts a string to an integer Explanation: The 'parseInt()' function is used to convert a string representation of a number into an integer. Open response 19 Describe the difference between 'let' and 'var' in JavaScript. Your answer: let is the mordern javascript language, but var is old Explanation: The 'let' keyword declares a block-scoped variable, while 'var' declares a variable that is func- tion-scoped.  True or False 20 The 'switch' statement in JavaScript is used for conditional branching. Your answer: True Explanation: The 'switch' statement allows for multiple conditional branches based on the value of a variable.