Programming

React Js MCQs MCQs: 536 Questions & Answers in Programming

536 React Js MCQs MCQs in Programming with answers & explanations. Page 3. Practice objective questions for competitive exams, interviews & self-assessment —… Use the answer toggle below to show or hide all solutions, tap an option to check one question, or open a question for its own page.

Page 3 of 27

Show answers

Answers hidden — tap an option or use “View Answer” on each question.

React Js MCQs MCQs: 536 Questions & Answers in Programming

Which of the following best describes React?

Which hook is used to memoize a callback function in React?

Which statement is true about state in React?

Which React hook is used to store and persist a reference across renders?

What is the role of defaultProps in React?

What will happen if you forget to include a key in a list item?

Which of the following is a valid custom hook name?

How can you conditionally render a component in React?

Which of the following is used to install React?

Which tag is necessary to wrap multiple elements in JSX?

What is the main purpose of useEffect in React?

Which of the following will NOT cause a component to re-render?

Which hook allows you to access the DOM element directly?

Which lifecycle method is equivalent to useEffect with an empty dependency array?

In JSX, how do you write a JavaScript expression?

Which of these is not a valid React event?

What will happen if you modify state directly in React?

What does a React component return?

What is the output of React.createElement?

How can we prevent a component from re-rendering?

Study tips for React Js MCQs