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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
Hindi
Question No# :
01
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# :
02
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# :
03
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# :
04
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# :
05
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# :
06
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# :
07
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# :
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
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# :
10
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# :
11
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# :
12
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# :
13
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# :
14
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# :
15
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# :
16
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# :
17
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# :
18
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# :
19
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# :
20
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# :
21
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# :
22
out of 50
In which of the following condition, the React.js Lifecycle method static get Derived Stae From Props(props, state) is called?
In which of the following condition, the React.js Lifecycle method static get Derived Stae From Props(props, state) is called?
A.
The state of the component is updated
The state of the component is updated
B.
The component is created for the first time
The component is created for the first time
C.
All of above
All of above
D.
None
None
Question No# :
23
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# :
24
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# :
25
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# :
26
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# :
27
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# :
28
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# :
29
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# :
30
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# :
31
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# :
32
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# :
33
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# :
34
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# :
35
out of 50
Choose the library which is most often associated with react?
Choose the library which is most often associated with react?
A.
Sinon
Sinon
B.
Chai
Chai
C.
Jest
Jest
D.
Mocha
Mocha
Question No# :
36
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# :
37
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# :
38
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# :
39
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# :
40
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# :
41
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# :
42
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# :
43
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# :
44
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# :
45
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# :
46
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# :
47
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# :
48
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# :
49
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# :
50
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
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