MongoDB Quizz Dive into our tech quiz zone and put your technical skills to the test! Our quizzes cover a wide array of technical topics, perfect for sharpening your knowledge and challenging your understanding. Compete with others, see your rankings, and boost your technical proficiency. Start quizzing today! 1 / 70 1. What is the purpose of the async keyword in Node.js? To handle synchronous operations To declare a generator function To declare a function that returns a promise To declare a callback function 2 / 70 2. What is the purpose of the useContext hook in React? To access context To manage refs To handle side effects To manage state 3 / 70 3. How do you handle errors in Express.js? Using a middleware function Using an error handler Using a try-catch block Both A and C 4 / 70 4. Which method is used to read a file in Node.js? fs.openFile() fs.readFile() fs.loadFile() fs.getFile() 5 / 70 5. What is a replica set in MongoDB? A group of nodes that maintain the same data A group of databases A set of indexes A set of collections 6 / 70 6. Which method is used to render a React component to the DOM? React.renderDOM() ReactDOM.render() React.render() ReactDOM.create() 7 / 70 7. Which part of the MERN stack is used as the server-side runtime? Node.js React.js MongoDB Express.js 8 / 70 8. Which tool is used to bundle React.js applications? Grunt Gulp Parcel Webpack 9 / 70 9. Which type of index is created by default on the _id field in MongoDB? Single Field Index Text Index Compound Index Hash Index 10 / 70 10. Which command is used to initialize a new Node.js project? node init npm init node create npm create 11 / 70 11. Which method is used to insert a document into a collection in MongoDB? db.collection.insertOne() db.collection.addDocument() db.collection.create() db.collection.add() 12 / 70 12. Which method is used to start an Express.js server? app.execute() app.run() app.start() app.listen() 13 / 70 13. How do you create a new collection in MongoDB? db.addCollection() db.createCollection() db.newCollection() db.makeCollection() 14 / 70 14. What is the purpose of the useState hook in React? To manage state in functional components To create context To manage refs To handle side effects 15 / 70 15. Which method is used to fetch data from an API in React.js? Both A and B axios.get() $.ajax() fetch() 16 / 70 16. Which command is used to install Express.js using npm? npm add express npm install express npm get express npm setup express 17 / 70 17. What is React.js? A front-end library A web server A back-end framework A database 18 / 70 18. Which method is used to find documents in a MongoDB collection? db.collection.get() db.collection.query() db.collection.find() db.collection.search() 19 / 70 19. Which hook is used to create a reference to a DOM element in React? useContext useState useEffect useRef 20 / 70 20. Which hook is used to manage state in functional components in React? useEffect useReducer useContext useState 21 / 70 21. How do you pass data from a parent component to a child component in React? Using state Using hooks Using props Using context 22 / 70 22. Which module is used to work with file and directory paths in Node.js? file path dir fs 23 / 70 23. What is the purpose of the require function in Node.js? To import modules To export modules To declare variables To handle errors 24 / 70 24. Which command is used to install Node.js packages? node setup npm install npm setup node install 25 / 70 25. Which method is used to handle POST requests in Express.js? app.create() app.post() app.use() app.handle() 26 / 70 26. Which lifecycle method is called after a component is rendered in React? componentWillUpdate componentDidUpdate componentWillMount componentDidMount 27 / 70 27. What is the purpose of the package.json file in a Node.js project? To list the project's dependencies To store metadata about the project All of the above To define scripts to run tasks 28 / 70 28. What is the use of the useEffect hook in React? To handle side effects To manage state To create context To manage refs 29 / 70 29. Which command is used to create a new React application? npx create react npm create react-app npx create-react-app npm create-app react 30 / 70 30. Which module is used to work with streams in Node.js? pipe buffer stream data 31 / 70 31. How do you conditionally render elements in React? Both A and C Using the for loop Using the if statement Using the ternary operator 32 / 70 32. What is JSX in React? JavaScript Express JavaScript XML JavaScript XHR JavaScript Extension 33 / 70 33. Which method is used to write to a file in Node.js? fs.addFile() fs.storeFile() fs.saveFile() fs.writeFile() 34 / 70 34. What is the use of the key prop in React? To handle events To manage state To identify unique elements in a list To pass data to child components 35 / 70 35. Which method is used to parse URL-encoded data in Express.js? express.urlencoded() express.bodyParser() express.parser() express.json() 36 / 70 36. What is a higher-order component (HOC) in React? A function that takes a component and returns a new component A component that manages state A component that handles events A component that accesses context 37 / 70 37. Which part of the MERN stack is responsible for handling HTTP requests? Node.js React.js MongoDB Express.js 38 / 70 38. What is middleware in Express.js? A function that handles errors A function that has access to the request and response objects A function that handles routing A function that connects to the database 39 / 70 39. What does MERN stand for? MongoDB, Express.js, Redux, Node.js MongoDB, Express.js, React.js, Node.js MongoDB, Ember.js, React.js, Node.js MySQL, Express.js, React.js, Node.js 40 / 70 40. Which object is used to handle HTTP requests and responses in Node.js? http.Response http.Client http.Request http.Server 41 / 70 41. Which format does MongoDB use to store data? YAML JSON XML CSV 42 / 70 42. What is the default port for an Express.js application? 3000 5000 8080 8000 43 / 70 43. Which part of the MERN stack is used for building user interfaces? React.js MongoDB Express.js Node.js 44 / 70 44. How do you parse JSON request bodies in Express.js? app.use(express.parser()) app.use(express.body()) app.use(express.urlencoded()) app.use(express.json()) 45 / 70 45. How do you create a component in React? By using the function keyword By using the class keyword Both A and B By using the component keyword 46 / 70 46. Which method is used to update the state in a React class component? changeState modifyState updateState setState 47 / 70 47. How do you export a module in Node.js? export.module exports.module module.exports module.export 48 / 70 48. What is MongoDB? A NoSQL database A relational database A web server A front-end framework 49 / 70 49. Which command is used to delete a database in MongoDB? db.dropDatabase() DROP DATABASE db.deleteDatabase() DELETE DATABASE 50 / 70 50. Which module is used to create a server in Node.js? net http server express 51 / 70 51. What is the purpose of the useReducer hook in React? To access context To handle side effects To manage state using a reducer function To manage refs 52 / 70 52. Which function is used to render a React component on the server side? ReactDOMServer.render() React.renderToString() ReactDOMServer.renderToString() React.render() 53 / 70 53. Which library is commonly used for state management in React.js applications? Lodash Redux Mongoose Axios 54 / 70 54. What is Node.js? A database A JavaScript runtime A CSS framework A front-end framework 55 / 70 55. What is the virtual DOM in React? A lightweight copy of the real DOM A way to manage state The actual DOM A context provider 56 / 70 56. Which command is used to create a new database in MongoDB? CREATE DATABASE INSERT INTO USE db.createDatabase 57 / 70 57. Which HTTP method is used to create a new resource? DELETE PUT POST GET 58 / 70 58. How do you handle events in React? Using the addEventListener method Both B and C By using the onEvent props By directly attaching handlers in JSX 59 / 70 59. What does the acronym BSON stand for in MongoDB? Binary Serialized Object Notation Binary Script Object Notation Binary Stream Object Notation Binary JSON Object Notation 60 / 70 60. What is the purpose of the res.send method in Express.js? To connect to the database To parse JSON data To handle requests To send a response to the client 61 / 70 61. Which method is used to make an HTTP request in Node.js? http.sendRequest() http.getRequest() http.createRequest() http.request() 62 / 70 62. What is Express.js? A web server framework for Node.js A front-end framework A database A CSS framework 63 / 70 63. What is the purpose of Mongoose in the MERN stack? To handle HTTP requests To build user interfaces To manage state To provide a schema-based solution for MongoDB 64 / 70 64. Which method is used to define a route in Express.js? app.get() app.handle() app.route() app.use() 65 / 70 65. Which method is used to start a server in Node.js? server.listen() server.start() server.run() server.execute() 66 / 70 66. Which module is used to create and manage a connection to MongoDB in Node.js? mongodb mongo mongooseDB mongoose 67 / 70 67. How do you style components in React? Using styled-components All of the above Using CSS Using inline styles 68 / 70 68. Which method is used to serve static files in Express.js? app.useStatic() app.use() app.static() app.serve() 69 / 70 69. Which method is used to update a document in MongoDB? db.collection.modify() db.collection.updateOne() db.collection.edit() db.collection.replaceOne() 70 / 70 70. What is the purpose of the next function in Express.js middleware? To end the request-response cycle To handle errors To pass control to the next middleware function To start the server Your score is 0%
