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