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What is the purpose of the express.Router() in Express.js?

  • To create a new route instance
  • To handle HTTP methods
  • To set up middleware
  • To manage server configurations
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What is Node.js primarily used for in the MERN stack?

  • Creating database schemas
  • Building server-side applications
  • Managing user sessions
  • Developing mobile apps
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How do you install a specific version of a package using npm?

  • npm install package@version
  • npm get package@version
  • npm add package@version
  • npm fetch package@version
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Which of the following is a correct way to create a functional component in React?

  • function MyComponent() { return <div></div>; }
  • class MyComponent extends React.Component { render() { return <div></div>; } }
  • React.createComponent() { return <div></div>; }
  • const MyComponent = () => { return <div></div>; }
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What does the command npx stand for?

  • Node Package Executor
  • Node Program Executor
  • Node Process Executor
  • Node Project Executor
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What does the command npm init do?

  • Initializes a new Node.js project
  • Installs npm
  • Updates npm
  • Creates a new package
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What is the purpose of the package.json file in a Node.js project?

  • To define project metadata
  • To create a new project
  • To install dependencies
  • To manage server configurations
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What is JSX in React?

  • A JavaScript XML syntax extension
  • A JavaScript framework
  • A database query language
  • A type of HTTP request
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Which of the following is a NoSQL database?

  • PostgreSQL
  • MySQL
  • MongoDB
  • SQLite
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Which command is used to check the version of Node.js installed?

  • node -v
  • node -version
  • node --version
  • node check-version
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Which component is known as the root component in a React application?

  • App
  • Root
  • Main
  • Base
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Which React hook is used to manage component state?

  • useState
  • useEffect
  • useContext
  • useRef
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Which function is used to create a schema in MongoDB?

  • createSchema
  • defineSchema
  • newSchema
  • mongoose.Schema
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How do you create a new component in React?

  • function ComponentName() { }
  • create ComponentName() { }
  • new ComponentName() { }
  • define ComponentName() { }
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What is the command to uninstall a package using npm?

  • npm uninstall package-name
  • npm remove package-name
  • npm delete package-name
  • npm unpackage package-name
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Which command is used to create a new directory in Node.js?

  • mkdir directory-name
  • newdir directory-name
  • createdir directory-name
  • makedir directory-name
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Which command is used to start a MongoDB server?

  • mongod
  • mongo start
  • mongo-server
  • mongodb-server
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What does the express.static middleware do?

  • Serves static files
  • Handles JSON requests
  • Manages sessions
  • Routes API requests
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What is the command to create a new MongoDB database?

  • use dbname
  • create dbname
  • new dbname
  • make dbname
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Which of the following is a backend framework?

  • React
  • Angular
  • Express
  • Vue.js
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What is the role of Express in the MERN stack?

  • Frontend framework
  • Backend framework
  • Database
  • Deployment tool
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What is the main purpose of the ReactDOM library?

  • To handle HTTP requests
  • To manage server-side operations
  • To interact with the DOM
  • To define component structure
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Which database is used in the MERN stack?

  • MySQL
  • MongoDB
  • PostgreSQL
  • SQLite
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What is a common HTTP method used for creating a new resource?

  • GET
  • POST
  • PUT
  • DELETE
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What does the npm command stand for?

  • Node Package Manager
  • New Programming Module
  • Node Program Manager
  • New Package Manager
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What is the default method used for form submission in HTML?

  • GET
  • POST
  • PUT
  • DELETE
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Which of the following is a popular middleware for handling JSON requests in Express.js?

  • bodyParser
  • multer
  • cookieParser
  • cors
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What does the "M" in MongoDB stand for?

  • MySQL
  • Middleware
  • MapReduce
  • MongoDB
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Which module in Node.js provides utilities for handling file paths?

  • path
  • fs
  • http
  • url
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Which lifecycle method is invoked after a component is rendered in React?

  • componentDidMount
  • componentWillMount
  • render
  • componentWillUnmount
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