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QUIZ ON : react - MISCELLANEOUS
MISCELLANEOUS
00:00:00
English
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Question No# :
01
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# :
02
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# :
03
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# :
04
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# :
05
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# :
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
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# :
08
out of 50
What is the purpose of React's "Suspense" component?
What is the purpose of React's "Suspense" component?
A.
To handle errors and fallback UI in React applications
To handle errors and fallback UI in React applications
B.
To provide a way to lazy-load components and data in React applications
To provide a way to lazy-load components and data in React applications
C.
To handle form validation in React applications
To handle form validation in React applications
D.
None of the above
None of the above
Question No# :
09
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# :
10
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# :
11
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# :
12
out of 50
What is the default port where web pack-server runs?
What is the default port where web pack-server runs?
A.
8080
8080
B.
6060
6060
C.
3000
3000
D.
3030
3030
Question No# :
13
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# :
14
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# :
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
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# :
17
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# :
18
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# :
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.
Synchronous in nature.
Synchronous in nature.
B.
Asynchronous in nature.
Asynchronous in nature.
C.
Are asynchronous but can be made synchronous when required.
Are asynchronous but can be made synchronous when required.
D.
None of the above.
None of the above.
Question No# :
20
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# :
21
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# :
22
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# :
23
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# :
24
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# :
25
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# :
26
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# :
27
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# :
28
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# :
29
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# :
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 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# :
32
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# :
33
out of 50
Which method is used to change the state of a component in React?
Which method is used to change the state of a component in React?
A.
setState()
setState()
B.
changeState()
changeState()
C.
updateState()
updateState()
D.
modifyState()
modifyState()
Question No# :
34
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# :
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
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# :
37
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# :
38
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# :
39
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# :
40
out of 50
What is the purpose of React's "setState" method when called with a function as an argument?
What is the purpose of React's "setState" method when called with a function as an argument?
A.
It is used to define the initial state of a component
It is used to define the initial state of a component
B.
It is used to handle user interactions in a component
It is used to handle user interactions in a component
C.
It is used to update the state of a component based on the previous state
It is used to update the state of a component based on the previous state
D.
It is used to render the component's UI
It is used to render the component's UI
Question No# :
41
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# :
42
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# :
43
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# :
44
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# :
45
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# :
46
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# :
47
out of 50
What is the role of a reducer in React?
What is the role of a reducer in React?
A.
It defines the initial state of a component
It defines the initial state of a component
B.
It determines the rendering of a component
It determines the rendering of a component
C.
It specifies the action types for handling user interactions
It specifies the action types for handling user interactions
D.
It manages the state transitions of a component based on dispatched actions
It manages the state transitions of a component based on dispatched actions
Question No# :
48
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# :
49
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# :
50
out of 50
What is the significance of the "PureComponent" in React?
What is the significance of the "PureComponent" in React?
A.
It is a component that can only render pure functions
It is a component that can only render pure functions
B.
It is a component optimized for performance by implementing a shallow comparison of props and state
It is a component optimized for performance by implementing a shallow comparison of props and state
C.
It is a component designed for rendering complex UI elements
It is a component designed for rendering complex UI elements
D.
None of the above
None of the above
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