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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 "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# :
02
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# :
03
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# :
04
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# :
05
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# :
06
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# :
07
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# :
08
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# :
09
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# :
10
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# :
11
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# :
12
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# :
13
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# :
14
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# :
15
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# :
16
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# :
17
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.
Question No# :
18
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# :
19
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# :
20
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# :
21
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# :
22
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# :
23
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# :
24
out of 50
How can you pass data from a parent component to a child component in React?
How can you pass data from a parent component to a child component in React?
A.
Using props
Using props
B.
Using state
Using state
C.
Using context
Using context
D.
All of the above
All of the above
Question No# :
25
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# :
26
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# :
27
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# :
28
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# :
29
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# :
30
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# :
31
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# :
32
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# :
33
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# :
34
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# :
35
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# :
36
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
Question No# :
37
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# :
38
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# :
39
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# :
40
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# :
41
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# :
42
out of 50
What is the purpose of React's "memo" function?
What is the purpose of React's "memo" function?
A.
It is used to memoize function components for performance optimization
It is used to memoize function components for performance optimization
B.
It is used to handle form validation in React components
It is used to handle form validation in React components
C.
It is used to create reusable custom hooks
It is used to create reusable custom hooks
D.
It is used to define the structure and layout of a React component
It is used to define the structure and layout of a React component
Question No# :
43
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# :
44
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# :
45
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# :
46
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# :
47
out of 50
In React, what is the purpose of the "shouldComponentUpdate" method?
In React, what is the purpose of the "shouldComponentUpdate" method?
A.
To determine if a component should re-render or not
To determine if a component should re-render or not
B.
To handle asynchronous actions and side effects
To handle asynchronous actions and side effects
C.
To define the initial state of a component
To define the initial state of a component
D.
To handle user interactions in a component
To handle user interactions in a component
Question No# :
48
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# :
49
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# :
50
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
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