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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
Hindi
Question No# :
01
out of 50
In relation to React js component lifecycle, which statement is true
In relation to React js component lifecycle, which statement is true
A.
Only function component can have life cycle
Only function component can have life cycle
B.
Only class components can have life cycle
Only class components can have life cycle
C.
Both type of components can have life cycle
Both type of components can have life cycle
D.
None of above
None of above
Question No# :
02
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# :
03
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# :
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 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# :
06
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# :
07
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# :
08
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# :
09
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# :
10
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# :
11
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# :
12
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# :
13
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# :
14
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# :
15
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# :
16
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# :
17
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# :
18
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# :
19
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# :
20
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# :
21
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# :
22
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# :
23
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# :
24
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# :
25
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# :
26
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# :
27
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# :
28
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# :
29
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# :
30
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# :
31
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# :
32
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# :
33
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# :
34
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# :
35
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# :
36
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# :
37
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# :
38
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# :
39
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# :
40
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# :
41
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# :
42
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# :
43
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# :
44
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# :
45
out of 50
What is the difference between controlled and uncontrolled components in React?
What is the difference between controlled and uncontrolled components in React?
A.
Controlled components rely on state for managing their data, while uncontrolled components do not.
Controlled components rely on state for managing their data, while uncontrolled components do not.
B.
Controlled components allow user input to directly update the component's state, while uncontrolled components do not.
Controlled components allow user input to directly update the component's state, while uncontrolled components do not.
C.
Controlled components are created using classes, while uncontrolled components are created using functions.
Controlled components are created using classes, while uncontrolled components are created using functions.
D.
There is no difference; the terms are used interchangeably.
There is no difference; the terms are used interchangeably.
Question No# :
46
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# :
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 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# :
49
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# :
50
out of 50
What is the lifecycle method used for initializing state and binding event handlers in React?
What is the lifecycle method used for initializing state and binding event handlers in React?
A.
componentDidMount
componentDidMount
B.
componentDidUpdate
componentDidUpdate
C.
componentWillMount
componentWillMount
D.
constructor
constructor
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