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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.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# :
02
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# :
03
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# :
04
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# :
05
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# :
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 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# :
08
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# :
09
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# :
10
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# :
11
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# :
12
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# :
13
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# :
14
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# :
15
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# :
16
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# :
17
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# :
18
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# :
19
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# :
20
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# :
21
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# :
22
out of 50
What changes would appear in the component as soon as the state of the React component is changed?
What changes would appear in the component as soon as the state of the React component is changed?
A.
It will re-render the component
It will re-render the component
B.
It can be created again from scratch
It can be created again from scratch
C.
It will do nothing; you have to call render method to render the component again
It will do nothing; you have to call render method to render the component again
D.
None
None
Question No# :
23
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# :
24
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# :
25
out of 50
What is the purpose of React's "ErrorBoundary" component?
What is the purpose of React's "ErrorBoundary" component?
A.
It is used to handle errors that occur during rendering or in lifecycle methods of React components
It is used to handle errors that occur during rendering or in lifecycle methods of React components
B.
It is used to manage state in functional components
It is used to manage state in functional components
C.
It is used to optimize the rendering performance of React components
It is used to optimize the rendering performance of React components
D.
It is used to handle form submissions in React components
It is used to handle form submissions in React components
Question No# :
26
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# :
27
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# :
28
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# :
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 purpose of React's "Context.Consumer" component?
What is the purpose of React's "Context.Consumer" component?
A.
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
B.
It is used to consume the context value provided by a "Context.Provider" component
It is used to consume the context value provided by a "Context.Provider" component
C.
It is used to render conditional content in React components
It is used to render conditional content 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# :
31
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# :
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 "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# :
34
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# :
35
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# :
36
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# :
37
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# :
38
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# :
39
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# :
40
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# :
41
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# :
42
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# :
43
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# :
44
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# :
45
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# :
46
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# :
47
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# :
48
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
Question No# :
49
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# :
50
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.
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