250+ React Js MCQ With Online Practice Test

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React.js, often simply called React, is a highly popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is renowned for its component-based architecture and the ability to efficiently update and render components when data changes. It is a foundational tool for developing modern web and mobile applications, allowing developers to create dynamic and interactive user interfaces with ease. React's vast ecosystem, including tools like React Native for mobile app development, makes it a top choice for frontend development and a key player in the world of web technologies.

111. In React, how are events typically named?

Answer: In camelCase

112. What is the primary purpose of handling events in React?

Answer: To respond to user interactions

113. In React, which attribute is used to specify an event handler in JSX?

Answer: onEvent

114. What is the recommended way to prevent the default behavior of an event in React?

Answer: By using the event.preventDefault() method

115. In React, how do you access the value of an input field when handling its onChange event?

Answer: By using the event.target.value property

116. Which event handler is used to handle a button click event in React?

Answer: onClick

117. In React, how do you pass arguments to an event handler function when an event occurs?

Answer: By using arrow functions

118. What is the purpose of using the bind method when defining event handlers in React?

Answer: To pass arguments to event handlers

119. In React, how do you conditionally render different elements based on an event?

Answer: By using JSX conditional rendering

120. Which React Hook is commonly used for handling state updates within event handlers in functional components?

Answer: useState
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React Js Multiple Choice Questions React Js MCQ React Js Interview Questions With Answers