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.

71. In React, what is the primary purpose of a form element?

Answer: Accepting user input

72. In React, how do you handle user input in controlled components?

Answer: By using the onChange event

73. Which React event is commonly used to handle changes in an input field's value?

Answer: onChange

74. What is the purpose of the value prop in a React input element?

Answer: To set the initial input value

75. In React, what is the recommended way to handle form submission?

Answer: Using the onSubmit event

76. What is the primary benefit of controlled components in React forms?

Answer: Simplicity and ease of use

77. In React, what does the defaultValue prop do when used with an input element?

Answer: It sets the initial input value

78. Which React library is commonly used for form validation in React applications?

Answer: React Formik

79. In a React form, how do you prevent the default form submission behavior when handling form submission?

Answer: By using the e.preventDefault() method

80. What is the purpose of the required attribute in a React input element?

Answer: To validate the input on submission
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React Js Multiple Choice Questions React Js MCQ React Js Interview Questions With Answers