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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
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Question No# :
01
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# :
02
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()
Question No# :
03
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# :
04
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# :
05
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# :
06
out of 50
Choose the correct statement in the context of uncontrolled components in ReactJS?
Choose the correct statement in the context of uncontrolled components in ReactJS?
A.
source of truth can be anything
source of truth can be anything
B.
source of truth is a component state
source of truth is a component state
C.
source of truth is DOM
source of truth is DOM
D.
none of the above
none of the above
Question No# :
07
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# :
08
out of 50
What is the recommended way to fetch data from an API in React?
What is the recommended way to fetch data from an API in React?
A.
Using the fetch API provided by the browser
Using the fetch API provided by the browser
B.
Using third-party libraries like Axios or Fetch
Using third-party libraries like Axios or Fetch
C.
Using the built-in "fetch" method provided by React
Using the built-in "fetch" method provided by React
D.
All of the above
All of the above
Question No# :
09
out of 50
What is the role of a reducer in React?
What is the role of a reducer in React?
A.
It defines the initial state of a component
It defines the initial state of a component
B.
It determines the rendering of a component
It determines the rendering of a component
C.
It specifies the action types for handling user interactions
It specifies the action types for handling user interactions
D.
It manages the state transitions of a component based on dispatched actions
It manages the state transitions of a component based on dispatched actions
Question No# :
10
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# :
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
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# :
13
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# :
14
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# :
15
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# :
16
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# :
17
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# :
18
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# :
19
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# :
20
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.
Synchronous in nature.
Synchronous in nature.
B.
Asynchronous in nature.
Asynchronous 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 above.
None of the above.
Question No# :
21
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# :
22
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# :
23
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# :
24
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# :
25
out of 50
What is the concept of React portals?
What is the concept of React portals?
A.
It is a way to create reusable UI components in React
It is a way to create reusable UI components in React
B.
It is a mechanism to optimize rendering performance in React
It is a mechanism to optimize rendering performance in React
C.
It is a way to render React components outside of their parent component's DOM hierarchy
It is a way to render React components outside of their parent component's DOM hierarchy
D.
None of the above
None of the above
Question No# :
26
out of 50
What is the purpose of the "useEffect" hook in React?
What is the purpose of the "useEffect" hook in React?
A.
To handle form submissions in React components
To handle form submissions in React components
B.
To manage the lifecycle of functional components
To manage the lifecycle of functional components
C.
To handle user interactions in React components
To handle user interactions in React components
D.
To create reusable logic in React components
To create reusable logic in React components
Question No# :
27
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# :
28
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# :
29
out of 50
What is the purpose of React's "useLayoutEffect" hook?
What is the purpose of React's "useLayoutEffect" hook?
A.
To handle asynchronous operations and data fetching in React components
To handle asynchronous operations and data fetching in React components
B.
To manage state in functional components
To manage state in functional components
C.
To perform side effects in a synchronous manner before the component is painted
To perform side effects in a synchronous manner before the component is painted
D.
To create reusable custom hooks
To create reusable custom hooks
Question No# :
30
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# :
31
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# :
32
out of 50
What is React Hooks in React?
What is React Hooks in React?
A.
A way to create reusable logic in functional components
A way to create reusable logic in functional components
B.
A replacement for class components in React
A replacement for class components in React
C.
A mechanism to manage state and lifecycle in functional components
A mechanism to manage state and lifecycle in functional components
D.
All of the above
All of the above
Question No# :
33
out of 50
In react, the key should be?
In react, the key should be?
A.
Unique among his siblings only
Unique among his siblings only
B.
Unique in the DOM
Unique in the DOM
C.
Does not requires to be unique
Does not requires to be unique
D.
all of the above
all of the above
Question No# :
34
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# :
35
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# :
36
out of 50
What is the significance of the "key" prop in React lists?
What is the significance of the "key" prop in React lists?
A.
It improves the performance of rendering lists
It improves the performance of rendering lists
B.
It ensures that the list items are displayed in alphabetical order
It ensures that the list items are displayed in alphabetical order
C.
It uniquely identifies each element in a list, aiding in efficient updates
It uniquely identifies each element in a list, aiding in efficient updates
D.
It controls the styling of list items
It controls the styling of list items
Question No# :
37
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# :
38
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# :
39
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# :
40
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# :
41
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# :
42
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# :
43
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# :
44
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# :
45
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# :
46
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# :
47
out of 50
What is the default port where web pack-server runs?
What is the default port where web pack-server runs?
A.
8080
8080
B.
6060
6060
C.
3000
3000
D.
3030
3030
Question No# :
48
out of 50
How can you access the state of a component from inside of a member function?
How can you access the state of a component from inside of a member function?
A.
this.state
this.state
B.
this.values
this.values
C.
this.getState()
this.getState()
D.
this.prototype.stateValue
this.prototype.stateValue
Question No# :
49
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# :
50
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
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