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