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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
What helps react for keeping their data unidirectional.?
What helps react for keeping their data unidirectional.?
A.
JSX
JSX
B.
Props
Props
C.
Flux
Flux
D.
DOM
DOM
Question No# :
03
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# :
04
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# :
05
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# :
06
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# :
07
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# :
08
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# :
09
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# :
10
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# :
11
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# :
12
out of 50
In React, what is the purpose of the "forwardRef" function?
In React, what is the purpose of the "forwardRef" function?
A.
To create higher-order components (HOCs) that forward props to child components
To create higher-order components (HOCs) that forward props to child components
B.
To create reusable custom hooks
To create reusable custom hooks
C.
To forward the ref from a parent component to a child component
To forward the ref from a parent component to a child component
D.
None of the above
None of the above
Question No# :
13
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# :
14
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# :
15
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# :
16
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# :
17
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# :
18
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# :
19
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# :
20
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# :
21
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# :
22
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# :
23
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# :
24
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# :
25
out of 50
When is useReducer used over useState in React component?
When is useReducer used over useState in React component?
A.
When we want to replace redux
When we want to replace redux
B.
When we want to break our production app
When we want to break our production app
C.
When we want to improve performance
When we want to improve performance
D.
none of the above
none of the above
Question No# :
26
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# :
27
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# :
28
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# :
29
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# :
30
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# :
31
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# :
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 "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# :
34
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# :
35
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# :
36
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# :
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 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# :
39
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# :
40
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# :
41
out of 50
In which of the following directory React.js components are saved?
In which of the following directory React.js components are saved?
A.
Inside the vendor/components/
Inside the vendor/components/
B.
Inside the vendor/
Inside the vendor/
C.
Inside the js/components/
Inside the js/components/
D.
Inside the external/components/
Inside the external/components/
Question No# :
42
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# :
43
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# :
44
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# :
45
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# :
46
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# :
47
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# :
48
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# :
49
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# :
50
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
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