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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
Hindi
Question No# :
01
out of 50
What is the purpose of the "React.Children" API in React?
What is the purpose of the "React.Children" API in React?
A.
It provides utilities for working with React children components
It provides utilities for working with React children components
B.
It manages the lifecycle of React components
It manages the lifecycle of React components
C.
It handles form validation in React applications
It handles form validation in React applications
D.
It optimizes the rendering performance of React components
It optimizes the rendering performance of React components
Question No# :
02
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# :
03
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# :
04
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# :
05
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# :
06
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# :
07
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# :
08
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# :
09
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# :
10
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# :
11
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# :
12
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# :
13
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
Question No# :
14
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# :
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
What is the purpose of the "useEffect" hook in React?
What is the purpose of the "useEffect" hook in React?
A.
To handle form validation in React components
To handle form validation in React components
B.
To manage the lifecycle of functional components
To manage the lifecycle of functional components
C.
To create custom hooks for reusable logic
To create custom hooks for reusable logic
D.
To handle asynchronous operations in React components
To handle asynchronous operations in React components
Question No# :
17
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# :
18
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# :
19
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# :
20
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# :
21
out of 50
Why is ref used?
Why is ref used?
A.
to bind the function
to bind the function
B.
to call the function
to call the function
C.
to directly access the DOM node
to directly access the DOM node
D.
to refer to another JS file
to refer to another JS file
Question No# :
22
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# :
23
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# :
24
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# :
25
out of 50
Why is the usage of set State?
Why is the usage of set State?
A.
Access the previous state before the set State operation
Access the previous state before the set State operation
B.
Replace the state completely instead of the default merge action
Replace the state completely instead of the default merge action
C.
Invoke code after the set State operation is done
Invoke code after the set State operation is done
D.
None
None
Question No# :
26
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# :
27
out of 50
What is the purpose of React's "StrictMode"?
What is the purpose of React's "StrictMode"?
A.
To enforce strict code quality rules in React applications
To enforce strict code quality rules in React applications
B.
To enable additional debugging checks and warnings in the development mode
To enable additional debugging checks and warnings in the development mode
C.
To ensure compatibility with older versions of React
To ensure compatibility with older versions of React
D.
None of the above
None of the above
Question No# :
28
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# :
29
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# :
30
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# :
31
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# :
32
out of 50
React Lifecycle method static getDerivedSateFromProps(props , state) is called when ___
React Lifecycle method static getDerivedSateFromProps(props , state) is called when ___
A.
Component is created for the first time
Component is created for the first time
B.
State of the component is updated
State of the component is updated
C.
Both A and B
Both A and B
D.
None of the above
None of the above
Question No# :
33
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# :
34
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# :
35
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# :
36
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# :
37
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# :
38
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# :
39
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 memoize function components for performance optimization
It is used to memoize function components for performance optimization
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 create reusable custom hooks
It is used to create reusable custom hooks
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# :
40
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# :
41
out of 50
In React, what is the purpose of the "setState" method?
In React, what is the purpose of the "setState" method?
A.
To update the state of a component
To update the state of a component
B.
To define the initial state of a component
To define the initial state of a component
C.
To handle user interactions in a component
To handle user interactions in a component
D.
To render the component's UI
To render the component's UI
Question No# :
42
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# :
43
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# :
44
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# :
45
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# :
46
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# :
47
out of 50
In React, what is the purpose of the "useImperativeHandle" hook?
In React, what is the purpose of the "useImperativeHandle" 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 expose certain methods of a child component to its parent component
To expose certain methods of a child component to its parent component
D.
To handle user interactions in React components
To handle user interactions in React components
Question No# :
48
out of 50
What is the purpose of React's "useCallback" hook?
What is the purpose of React's "useCallback" hook?
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 user interactions in React components
It is used to handle user interactions in React components
C.
It is used to handle form submissions in React components
It is used to handle form submissions in React components
D.
It is used to memoize functions for performance optimization
It is used to memoize functions for performance optimization
Question No# :
49
out of 50
What is the purpose of React's "getDerivedStateFromProps" lifecycle method?
What is the purpose of React's "getDerivedStateFromProps" lifecycle method?
A.
It is used to handle form submissions in React components
It is used to handle form submissions in 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 update the state of a component based on changes in props
It is used to update the state of a component based on changes in props
D.
It is used to handle user interactions in React components
It is used to handle user interactions in React components
Question No# :
50
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
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