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