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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
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Question No# :
01
out of 50
In React, what is the purpose of the "useRef" hook?
In React, what is the purpose of the "useRef" hook?
A.
To manage state in functional components
To manage state in functional components
B.
To handle form submissions in React components
To handle form submissions in React components
C.
To create a reference to an element or value in a functional component
To create a reference to an element or value in a functional component
D.
To handle asynchronous operations and data fetching
To handle asynchronous operations and data fetching
Question No# :
02
out of 50
Which method in a React Component should you override to stop the component from updating?
Which method in a React Component should you override to stop the component from updating?
A.
willComponentUpdate
willComponentUpdate
B.
shouldComponentUpdate
shouldComponentUpdate
C.
componentDidUpdate
componentDidUpdate
D.
componentDidMount
componentDidMount
Question No# :
03
out of 50
What is JSX in React?
What is JSX in React?
A.
JavaScript XML
JavaScript XML
B.
Java syntax extension
Java syntax extension
C.
A templating language
A templating language
D.
None of the above
None of the above
Question No# :
04
out of 50
What is the significance of React's "virtual DOM"?
What is the significance of React's "virtual DOM"?
A.
It is a way to optimize rendering performance in React applications
It is a way to optimize rendering performance in React applications
B.
It is a mechanism to handle errors and fallback UI in React applications
It is a mechanism to handle errors and fallback UI in React applications
C.
It is a technique to render React components outside of their parent component's DOM hierarchy
It is a technique to render React components outside of their parent component's DOM hierarchy
D.
It is a representation of the actual DOM in memory, allowing efficient updates and rendering
It is a representation of the actual DOM in memory, allowing efficient updates and rendering
Question No# :
05
out of 50
What is the purpose of React's "useContext" hook?
What is the purpose of React's "useContext" hook?
A.
To handle form submissions in React components
To handle form submissions in React components
B.
To manage state in functional components
To manage state in functional components
C.
To handle navigation in React applications
To handle navigation in React applications
D.
To provide access to the context value in functional components
To provide access to the context value in functional components
Question No# :
06
out of 50
What is the purpose of React's "ErrorBoundary" component?
What is the purpose of React's "ErrorBoundary" component?
A.
It is used to handle errors that occur during rendering or in lifecycle methods of React components
It is used to handle errors that occur during rendering or in lifecycle methods of React components
B.
It is used to manage state in functional components
It is used to manage state in functional components
C.
It is used to optimize the rendering performance of React components
It is used to optimize the rendering performance of React components
D.
It is used to handle form submissions in React components
It is used to handle form submissions in React components
Question No# :
07
out of 50
In React, what is the purpose of the "forwardRef" function?
In React, what is the purpose of the "forwardRef" function?
A.
In React, what is the purpose of the "forwardRef" function?
In React, what is the purpose of the "forwardRef" function?
B.
It is used to forward props to child components
It is used to forward props to child components
C.
It is used to forward a ref to a child component
It is used to forward a ref to a child component
D.
It is used to define the structure and layout of a React component
It is used to define the structure and layout of a React component
Question No# :
08
out of 50
What is used to handle code-splitting?
What is used to handle code-splitting?
A.
React.lazy
React.lazy
B.
React.memo
React.memo
C.
React.fallback
React.fallback
D.
React.split
React.split
Question No# :
09
out of 50
What is the purpose of React's "createContext" function?
What is the purpose of React's "createContext" function?
A.
It is used to create custom hooks in React
It is used to create custom hooks in React
B.
It is used to define the structure and layout of a React component
It is used to define the structure and layout of a React component
C.
It is used to create a context object for sharing data across components
It is used to create a context object for sharing data across components
D.
It is used to handle asynchronous operations and data fetching in React components
It is used to handle asynchronous operations and data fetching in React components
Question No# :
10
out of 50
How can you pass data from a parent component to a child component in React?
How can you pass data from a parent component to a child component in React?
A.
Using props
Using props
B.
Using state
Using state
C.
Using context
Using context
D.
All of the above
All of the above
Question No# :
11
out of 50
Which of the following is the correct name of React.js?
Which of the following is the correct name of React.js?
A.
React.js
React.js
B.
React
React
C.
ReactJS
ReactJS
D.
All of the above
All of the above
Question No# :
12
out of 50
What are the two ways to handle data in React?
What are the two ways to handle data in React?
A.
Services & Components
Services & Components
B.
State & Component
State & Component
C.
State & Props
State & Props
D.
State & Services
State & Services
Question No# :
13
out of 50
What is the purpose of the "React.Fragment" component in React?
What is the purpose of the "React.Fragment" component in React?
A.
It is used to define the structure and layout of a React component
It is used to define the structure and layout of a React component
B.
It is used to handle asynchronous operations and data fetching
It is used to handle asynchronous operations and data fetching
C.
It is used as a wrapper to render multiple elements without adding extra nodes to the DOM
It is used as a wrapper to render multiple elements without adding extra nodes to the DOM
D.
None of the above
None of the above
Question No# :
14
out of 50
What is the purpose of React's "useReducer" hook?
What is the purpose of React's "useReducer" hook?
A.
It is used to manage state in functional components
It is used to manage state in functional components
B.
It is used to handle form submissions in React components
It is used to handle form submissions in React components
C.
It is used to handle user interactions in React components
It is used to handle user interactions in React components
D.
It is used to optimize the rendering performance of React components
It is used to optimize the rendering performance of React components
Question No# :
15
out of 50
Which of the following is used to pass data to a component from outside in React.js?
Which of the following is used to pass data to a component from outside in React.js?
A.
Render with arguments
Render with arguments
B.
PropTypes
PropTypes
C.
SetState
SetState
D.
Props
Props
Question No# :
16
out of 50
What is the purpose of the "componentDidUpdate" lifecycle method in React?
What is the purpose of the "componentDidUpdate" lifecycle method in React?
A.
To perform cleanup operations before a component is unmounted
To perform cleanup operations before a component is unmounted
B.
To handle errors that occur during rendering or in lifecycle methods
To handle errors that occur during rendering or in lifecycle methods
C.
To update the component's state and trigger re-rendering based on certain conditions
To update the component's state and trigger re-rendering based on certain conditions
D.
None of the above
None of the above
Question No# :
17
out of 50
What is the purpose of the "useContext" hook in React?
What is the purpose of the "useContext" hook in React?
A.
To manage state in functional components
To manage state in functional components
B.
To handle asynchronous operations and data fetching
To handle asynchronous operations and data fetching
C.
To provide access to the nearest common ancestor component's context
To provide access to the nearest common ancestor component's context
D.
None of the above
None of the above
Question No# :
18
out of 50
We can update the state in React.js by calling to setState() method. These calls are__________
We can update the state in React.js by calling to setState() method. These calls are__________
A.
Asynchronous in nature
Asynchronous in nature
B.
Synchronous in nature
Synchronous in nature
C.
Are asynchronous but can be made synchronous when required
Are asynchronous but can be made synchronous when required
D.
None of the these
None of the these
Question No# :
19
out of 50
What is the purpose of React Router?
What is the purpose of React Router?
A.
To handle server-side routing in React applications
To handle server-side routing in React applications
B.
To manage state and data flow in React components
To manage state and data flow in React components
C.
To enable client-side routing in React applications
To enable client-side routing in React applications
D.
To provide a built-in testing framework for React applications
To provide a built-in testing framework for React applications
Question No# :
20
out of 50
What is the use of “web pack” command in React.js?
What is the use of “web pack” command in React.js?
A.
It is a module bundler
It is a module bundler
B.
The “webpack” command is used to transpile all the JavaScript down into one file
The “webpack” command is used to transpile all the JavaScript down into one file
C.
It runs React local development server
It runs React local development server
D.
None of the above
None of the above
Question No# :
21
out of 50
Choose the component which should be overridden to stop the component from updating?
Choose the component which should be overridden to stop the component from updating?
A.
componentsDidUpdate
componentsDidUpdate
B.
componentDidMaunt
componentDidMaunt
C.
willComponentsUpdate
willComponentsUpdate
D.
ShouldComponentUpdate
ShouldComponentUpdate
Question No# :
22
out of 50
What is React context used for?
What is React context used for?
A.
To pass data to deeply nested components without explicit prop drilling
To pass data to deeply nested components without explicit prop drilling
B.
To manage the global state of a React application
To manage the global state of a React application
C.
To enable communication between sibling components
To enable communication between sibling components
D.
All of the above
All of the above
Question No# :
23
out of 50
Arbitrary inputs of components in React are called
Arbitrary inputs of components in React are called
A.
Keys
Keys
B.
Props
Props
C.
Elements
Elements
D.
Ref
Ref
Question No# :
24
out of 50
Does React.js create a VIRTUAL DOM in the memory?
Does React.js create a VIRTUAL DOM in the memory?
A.
True
True
B.
False
False
C.
Cannot say
Cannot say
D.
None of above
None of above
Question No# :
25
out of 50
What is snapshot testing used for in react?
What is snapshot testing used for in react?
A.
It allows us to test Javascript objects
It allows us to test Javascript objects
B.
It helps you write applications
It helps you write applications
C.
It provides clear, enduring assertions
It provides clear, enduring assertions
D.
None of the above
None of the above
Question No# :
26
out of 50
Which of the following is not a valid hook in React?
Which of the following is not a valid hook in React?
A.
useState
useState
B.
useEffect
useEffect
C.
useData
useData
D.
useContext
useContext
Question No# :
27
out of 50
In React, what is the purpose of the "shouldComponentUpdate" method?
In React, what is the purpose of the "shouldComponentUpdate" method?
A.
To determine if a component should re-render or not
To determine if a component should re-render or not
B.
To handle asynchronous actions and side effects
To handle asynchronous actions and side effects
C.
To define the initial state of a component
To define the initial state of a component
D.
To handle user interactions in a component
To handle user interactions in a component
Question No# :
28
out of 50
What is the purpose of React's "PropTypes" library?
What is the purpose of React's "PropTypes" library?
A.
It is used to define the structure and layout of a React component
It is used to define the structure and layout of a React component
B.
It is used to handle form validation in React components
It is used to handle form validation in React components
C.
It is used to specify the types of props that a component should receive
It is used to specify the types of props that a component should receive
D.
It is used to manage the state of a component
It is used to manage the state of a component
Question No# :
29
out of 50
What is the concept of "code splitting" in React?
What is the concept of "code splitting" in React?
A.
It is a technique to divide code into smaller modules for better performance and optimization
It is a technique to divide code into smaller modules for better performance and optimization
B.
It is a way to write cleaner and more maintainable code in React applications
It is a way to write cleaner and more maintainable code in React applications
C.
It is a technique to improve the rendering performance of React components
It is a technique to improve the rendering performance of React components
D.
None of the above
None of the above
Question No# :
30
out of 50
Which method is used to change the state of a component in React?
Which method is used to change the state of a component in React?
A.
setState()
setState()
B.
changeState()
changeState()
C.
updateState()
updateState()
D.
modifyState()
modifyState()
Question No# :
31
out of 50
What is the purpose of the React Developer Tools extension?
What is the purpose of the React Developer Tools extension?
A.
It allows developers to inspect the component hierarchy and state in a React application
It allows developers to inspect the component hierarchy and state in a React application
B.
It provides a code editor specifically designed for writing React components
It provides a code editor specifically designed for writing React components
C.
It enables real-time collaboration among multiple developers working on a React project
It enables real-time collaboration among multiple developers working on a React project
D.
It automatically generates documentation for React components
It automatically generates documentation for React components
Question No# :
32
out of 50
What is the purpose of the "render" method in React?
What is the purpose of the "render" method in React?
A.
To define the initial state of a component
To define the initial state of a component
B.
To render the component's UI based on its current state and props
To render the component's UI based on its current state and props
C.
To handle user interactions and update the component's state
To handle user interactions and update the component's state
D.
To define the lifecycle methods of a component
To define the lifecycle methods of a component
Question No# :
33
out of 50
How do you handle passing through the component tree without having to pass props down manually at every level?
How do you handle passing through the component tree without having to pass props down manually at every level?
A.
React Send
React Send
B.
React Pinpoint
React Pinpoint
C.
React Router
React Router
D.
React Context
React Context
Question No# :
34
out of 50
Which of the following terms commonly described react applications?
Which of the following terms commonly described react applications?
A.
Imerative
Imerative
B.
Integrated
Integrated
C.
Declarative
Declarative
D.
closed
closed
Question No# :
35
out of 50
Which of the following statement is true for uncontrolled components in React.js?
Which of the following statement is true for uncontrolled components in React.js?
A.
The source of truth is a component state
The source of truth is a component state
B.
The source of truth can be anything
The source of truth can be anything
C.
The source of truth is DOM
The source of truth is DOM
D.
None
None
Question No# :
36
out of 50
In React, what is the purpose of the "forwardRef" function?
In React, what is the purpose of the "forwardRef" function?
A.
To create higher-order components (HOCs) that forward props to child components
To create higher-order components (HOCs) that forward props to child components
B.
To create reusable custom hooks
To create reusable custom hooks
C.
To forward the ref from a parent component to a child component
To forward the ref from a parent component to a child component
D.
None of the above
None of the above
Question No# :
37
out of 50
What is the purpose of React's "setState" method when called with a function as an argument?
What is the purpose of React's "setState" method when called with a function as an argument?
A.
It is used to define the initial state of a component
It is used to define the initial state of a component
B.
It is used to handle user interactions in a component
It is used to handle user interactions in a component
C.
It is used to update the state of a component based on the previous state
It is used to update the state of a component based on the previous state
D.
It is used to render the component's UI
It is used to render the component's UI
Question No# :
38
out of 50
What is the purpose of state in React?
What is the purpose of state in React?
A.
To store and manage data within a component
To store and manage data within a component
B.
To define the structure of a React component
To define the structure of a React component
C.
To handle user interactions in a component
To handle user interactions in a component
D.
To style the components
To style the components
Question No# :
39
out of 50
What is the purpose of React's "render props" pattern?
What is the purpose of React's "render props" pattern?
A.
It is a technique to render HTML elements in React components
It is a technique to render HTML elements in React components
B.
It is a way to pass a function as a prop to a component for rendering dynamic content
It is a way to pass a function as a prop to a component for rendering dynamic content
C.
It is a method to define the initial state of a component
It is a method to define the initial state of a component
D.
It is a way to handle user interactions in React components
It is a way to handle user interactions in React components
Question No# :
40
out of 50
How can you handle forms in React?
How can you handle forms in React?
A.
By using the controlled component pattern
By using the controlled component pattern
B.
By using the uncontrolled component pattern
By using the uncontrolled component pattern
C.
By using form libraries like Formik or React Hook Form
By using form libraries like Formik or React Hook Form
D.
All of the above
All of the above
Question No# :
41
out of 50
What is a state in React?
What is a state in React?
A.
External storage of the component
External storage of the component
B.
A permanent storage
A permanent storage
C.
Internal storage of the component
Internal storage of the component
D.
None of the above
None of the above
Question No# :
42
out of 50
What helps react for keeping their data unidirectional.?
What helps react for keeping their data unidirectional.?
A.
JSX
JSX
B.
Props
Props
C.
Flux
Flux
D.
DOM
DOM
Question No# :
43
out of 50
Which of the following is a must API for every React.js component?
Which of the following is a must API for every React.js component?
A.
render Component
render Component
B.
Setinitial Component
Setinitial Component
C.
render
render
D.
All of the above
All of the above
Question No# :
44
out of 50
In React, what is the purpose of the "defaultProps" property?
In React, what is the purpose of the "defaultProps" property?
A.
It specifies the default values for props in a component
It specifies the default values for props in a component
B.
It sets the initial state of a component
It sets the initial state of a component
C.
It defines the default styling for a component
It defines the default styling for a component
D.
It determines the default behavior of a component's lifecycle methods
It determines the default behavior of a component's lifecycle methods
Question No# :
45
out of 50
What can you use to handle code splitting?
What can you use to handle code splitting?
A.
React.split
React.split
B.
React.lazy
React.lazy
C.
React.memo
React.memo
D.
React.fallback
React.fallback
Question No# :
46
out of 50
What is the purpose of the "React.StrictMode" component in React?
What is the purpose of the "React.StrictMode" component in React?
A.
To enable additional debugging checks and warnings in the development mode
To enable additional debugging checks and warnings in the development mode
B.
To enforce strict code quality rules in React applications
To enforce strict code quality rules in React applications
C.
To ensure compatibility with older versions of React
To ensure compatibility with older versions of React
D.
To optimize rendering performance in React applications
To optimize rendering performance in React applications
Question No# :
47
out of 50
What is the purpose of the "React.memo" higher-order component (HOC)?
What is the purpose of the "React.memo" higher-order component (HOC)?
A.
It is used to memoize function components for performance optimization
It is used to memoize function components for performance optimization
B.
It is used to create reusable custom hooks in React
It is used to create reusable custom hooks in React
C.
It is used to manage state in class components
It is used to manage state in class components
D.
It is used to handle asynchronous operations and data fetching
It is used to handle asynchronous operations and data fetching
Question No# :
48
out of 50
What is the purpose of the "useReducer" hook in React?
What is the purpose of the "useReducer" hook in React?
A.
To handle asynchronous operations and data fetching
To handle asynchronous operations and data fetching
B.
To manage complex state and state transitions in functional components
To manage complex state and state transitions in functional components
C.
To create reusable custom hooks
To create reusable custom hooks
D.
None of the above
None of the above
Question No# :
49
out of 50
What changes would appear in the component as soon as the state of the React component is changed?
What changes would appear in the component as soon as the state of the React component is changed?
A.
It will re-render the component
It will re-render the component
B.
It can be created again from scratch
It can be created again from scratch
C.
It will do nothing; you have to call render method to render the component again
It will do nothing; you have to call render method to render the component again
D.
None
None
Question No# :
50
out of 50
How can you handle errors in React components?
How can you handle errors in React components?
A.
By using the "try-catch" block in the component's render method
By using the "try-catch" block in the component's render method
B.
By using the "componentDidCatch" lifecycle method to catch and handle errors
By using the "componentDidCatch" lifecycle method to catch and handle errors
C.
By using global error handling provided by the browser
By using global error handling provided by the browser
D.
None of the above
None of the above
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