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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
Hindi
Question No# :
01
out of 50
Which company developed ReactJS?
Which company developed ReactJS?
A.
Apple
Apple
B.
Facebook
Facebook
C.
Google
Google
D.
Twitter
Twitter
Question No# :
02
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# :
03
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# :
04
out of 50
What is a React component?
What is a React component?
A.
A function that returns JSX
A function that returns JSX
B.
A class that extends the React.Component class
A class that extends the React.Component class
C.
Both a function and a class can be React components
Both a function and a class can be React components
D.
None of the above
None of the above
Question No# :
05
out of 50
What is true for the keys given to a list of elements in React?
What is true for the keys given to a list of elements in React?
A.
Unique in the DOM.
Unique in the DOM.
B.
Unique among the siblings only.
Unique among the siblings only.
C.
Do not require to be unique.
Do not require to be unique.
D.
None of the above.
None of the above.
Question No# :
06
out of 50
How many numbers of elements a valid react component can return?
How many numbers of elements a valid react component can return?
A.
2
2
B.
1
1
C.
4
4
D.
5
5
Question No# :
07
out of 50
What is the significance of the "PureComponent" in React?
What is the significance of the "PureComponent" in React?
A.
It is a component that can only render pure functions
It is a component that can only render pure functions
B.
It is a component optimized for performance by implementing a shallow comparison of props and state
It is a component optimized for performance by implementing a shallow comparison of props and state
C.
It is a component designed for rendering complex UI elements
It is a component designed for rendering complex UI elements
D.
None of the above
None of the above
Question No# :
08
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# :
09
out of 50
Which of following is used to pass data to a component from outside?
Which of following is used to pass data to a component from outside?
A.
PropTypes
PropTypes
B.
setState
setState
C.
render with arguments
render with arguments
D.
props
props
Question No# :
10
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# :
11
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# :
12
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# :
13
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# :
14
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# :
15
out of 50
What is the purpose of React's "Fragment" component?
What is the purpose of React's "Fragment" component?
A.
It is used to wrap multiple components within a single parent component
It is used to wrap multiple components within a single parent component
B.
It is used to conditionally render components based on certain conditionsIt is used to create reusable UI components in React
It is used to conditionally render components based on certain conditionsIt is used to create reusable UI components in React
C.
It is used to create reusable UI components in React
It is used to create reusable UI components in React
D.
It is used to render multiple elements without adding extra nodes to the DOM
It is used to render multiple elements without adding extra nodes to the DOM
Question No# :
16
out of 50
Which of the following command is used to install create-react-app?
Which of the following command is used to install create-react-app?
A.
npm install -f create-react-app
npm install -f create-react-app
B.
npm install -g create-react-app
npm install -g create-react-app
C.
npm install create-react-app
npm install create-react-app
D.
install -g create-react-app
install -g create-react-app
Question No# :
17
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# :
18
out of 50
What is the virtual DOM in React?
What is the virtual DOM in React?
A.
An alternative implementation of the DOM provided by React
An alternative implementation of the DOM provided by React
B.
A lightweight version of the DOM used for testing purposes
A lightweight version of the DOM used for testing purposes
C.
A concept used to optimize rendering performance in React
A concept used to optimize rendering performance in React
D.
None of the above
None of the above
Question No# :
19
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# :
20
out of 50
What is the purpose of React's "Suspense" component?
What is the purpose of React's "Suspense" component?
A.
To handle errors and fallback UI in React applications
To handle errors and fallback UI in React applications
B.
To provide a way to lazy-load components and data in React applications
To provide a way to lazy-load components and data in React applications
C.
To handle form validation in React applications
To handle form validation in React applications
D.
None of the above
None of the above
Question No# :
21
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# :
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
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# :
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 the purpose of the "React.Fragment" shorthand syntax in React?
What is the purpose of the "React.Fragment" shorthand syntax in React?
A.
It is used to create a new React component
It is used to create a new React component
B.
It is used to render multiple elements without adding extra nodes to the DOM
It is used to render multiple elements without adding extra nodes to the DOM
C.
It is used to define the initial state of a component
It is used to define the initial state of a component
D.
It is used to manage the lifecycle of a component
It is used to manage the lifecycle of a component
Question No# :
26
out of 50
What is the concept of "lifting state up" in React?
What is the concept of "lifting state up" in React?
A.
Moving the state from a child component to its parent component
Moving the state from a child component to its parent component
B.
Moving the state from a parent component to its child component
Moving the state from a parent component to its child component
C.
Extracting the state into a separate utility function
Extracting the state into a separate utility function
D.
Sharing the state between multiple unrelated components
Sharing the state between multiple unrelated components
Question No# :
27
out of 50
Which of the following function is used to change the state of the React.js component?
Which of the following function is used to change the state of the React.js component?
A.
this.setChangeState
this.setChangeState
B.
this.State{}
this.State{}
C.
this.setState
this.setState
D.
None of the above
None of the above
Question No# :
28
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# :
29
out of 50
What is the purpose of keys in React lists?
What is the purpose of keys in React lists?
A.
To uniquely identify elements in a list
To uniquely identify elements in a list
B.
To define the layout and styling of list items
To define the layout and styling of list items
C.
To handle event listeners on list items
To handle event listeners on list items
D.
None of the above
None of the above
Question No# :
30
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# :
31
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# :
32
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# :
33
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# :
34
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# :
35
out of 50
Which of the following option is correct in the case of the Babel?
Which of the following option is correct in the case of the Babel?
A.
Babel is a Transpolar
Babel is a Transpolar
B.
Babel is a Compiler
Babel is a Compiler
C.
All of above
All of above
D.
None of above
None of above
Question No# :
36
out of 50
What is the purpose of the "React.memo" function in React?
What is the purpose of the "React.memo" function in React?
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 custom hooks in React
It is used to create custom hooks in React
C.
It is used to manage state in class components
It is used to manage state in class components
D.
None of the above
None of the above
Question No# :
37
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# :
38
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# :
39
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# :
40
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# :
41
out of 50
Why is useLayoutEffect used?
Why is useLayoutEffect used?
A.
To complete the update
To complete the update
B.
To optimize for all devices
To optimize for all devices
C.
To change the layout of the screen
To change the layout of the screen
D.
when you need the browser to paint before the effectors
when you need the browser to paint before the effectors
Question No# :
42
out of 50
What is the functionality of a “webpack” command?
What is the functionality of a “webpack” command?
A.
Runs react local development server
Runs react local development server
B.
transfer files all the JavaScript down into one file
transfer files all the JavaScript down into one file
C.
a module blunder
a module blunder
D.
none of the above
none of the above
Question No# :
43
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# :
44
out of 50
What is the purpose of React hooks like "useMemo" and "useCallback"?
What is the purpose of React hooks like "useMemo" and "useCallback"?
A.
To optimize the performance of functional components by memoizing values and functions
To optimize the performance of functional components by memoizing values and functions
B.
To manage the state of functional components
To manage the state of functional components
C.
To handle side effects in functional components
To handle side effects in functional components
D.
None of the above
None of the above
Question No# :
45
out of 50
What is the significance of the "key" prop in React when rendering a list of elements?
What is the significance of the "key" prop in React when rendering a list of elements?
A.
It ensures unique styling for each list item
It ensures unique styling for each list item
B.
It determines the order in which the list items are rendered
It determines the order in which the list items are rendered
C.
It improves the performance of rendering the list
It improves the performance of rendering the list
D.
It helps React identify which items have changed, been added, or been removed
It helps React identify which items have changed, been added, or been removed
Question No# :
46
out of 50
In which directory is react component saved?
In which directory is react component saved?
A.
vendor/js/components/
vendor/js/components/
B.
components/js
components/js
C.
js/components
js/components
D.
vendor/components
vendor/components
Question No# :
47
out of 50
What is the purpose of React's "key" prop when rendering a list of elements?
What is the purpose of React's "key" prop when rendering a list of elements?
A.
It determines the order in which the list items are rendered
It determines the order in which the list items are rendered
B.
It ensures unique styling for each list item
It ensures unique styling for each list item
C.
It improves the performance of rendering the list
It improves the performance of rendering the list
D.
It helps React identify which items have changed, been added, or been removed
It helps React identify which items have changed, been added, or been removed
Question No# :
48
out of 50
What is the purpose of React's "memo" function?
What is the purpose of React's "memo" function?
A.
It is used to create reusable custom hooks in React
It is used to create reusable custom hooks in React
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 optimize the rendering performance of React components
It is used to optimize the rendering performance of React 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# :
49
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# :
50
out of 50
Which of the following method is not a part of ReactDOM?
Which of the following method is not a part of ReactDOM?
A.
ReactDOM.destroy()
ReactDOM.destroy()
B.
ReactDOM.hydrate()
ReactDOM.hydrate()
C.
ReactDOM.createPortal()
ReactDOM.createPortal()
D.
ReactDOM.findDOMNode()
ReactDOM.findDOMNode()
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