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React JS MCQ
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- 31st May, 2022
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React JS MCQ
1) What is React Js?
2) What does ReactJS cover?
3) What does ReactJS use to increase performance?
4) React is ............ Javascript library
6) For controlled components in react
7) For uncontrolled components in react
8) Number of elements, a valid react component can return
9) React is a ________
10) Which of the following API is a MUST for every ReactJS component?
11) How can you access the state of a component from inside of a member function?
12) What is a good use case for using a function while rendering a dynamic list of items
13) What is the second argument for setState useful for?
14) ReactJS uses _____ to increase performance
15) What is the default port for webpack dev server?
16) What are two ways data gets handled in react?
17) React Js is developed by
18) What are the limitations of ReactJS?
19) How many stages are there in React js life cycle
20) In relation to React js component lifecycle, which statement is true
21) In react, this is used to pass data to component from outside?
22) Ref in react component is used to assign reference to DOM elements. Ref can be created by
23) Everything in react is __________
24) How many elements does a react component returns?
25) Which of the following is a correct definition of state in react?
26) The state in react can be updated by call to setState method. These calls are
27) Keys are given to a list of elements in react. These keys should be
28) Regarding React js components, which of following statement is true?
29) To update state in react forcefully, which method is used
30) What will happen if you render an input element with disabled = {false}
React Js Online Test Questions (React Js FAQs)
1) What is a React js?
React JS is a JavaScript library used in web development to build interactive elements on websites. It helps the developers build user interfaces or UIs easily.
2) What is state in React?
State is a JavaScript object that stores a component's dynamic data and it enables a component to keep track of changes between renders. AS we know State is Dynamic so we can't use it for static React projects.
3) List different types of component in React js?
There are 7 types of React Components :
- Functional Components
- Class Components
- Higher-Order Components
- Dumb Components
- Smart Components
- Presentational Components
- Container components
4) How many number of elements a valid react component can return?
A valid react component can return only one element.
5) What is the second argument for setstate() method in React?
The second argument to setState() is an optional callback function that will be executed once setState is completed and the component is re-rendered.
6) In which directory react components are saved?
React components are saved in "Inside js/components/".
7) What does the webpack command do?
The webpack command build's our application based on the configuration made available in the file.
8) What are the interactive properties in react?
9) What is NPX?
The npx stands for Node Package Execute, npx is a CLI tool whose purpose is to make it easy to install and manage dependencies hosted in the npm registry.
10) What are props in react js?
Props are arguments passed into React components. Props are passed to components via HTML attributes.
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