MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your React JS MCQ (Multiple Choice Questions) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is correct about prop in react? |
| A. | Can be changed inside another component |
| B. | Can be changed inside the component |
| C. | Cannot be changed in the component |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 2. |
Which of the following is method is not a part of ReactDOM? |
| A. | ReactDOM.hydrate() |
| B. | ReactDOM.destroy() |
| C. | ReactDOM.createPortal() |
| D. | All of the mentioned |
| Answer» C. ReactDOM.createPortal() | |
| 3. |
In which condition is the React.js Lifecycle method static getDerivedSateFromProps(props, state) is called? |
| A. | When the state of the component is updated |
| B. | When a component is created for the first time |
| C. | Both of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
Which of the following command is used to Install create-react-app? |
| A. | npm install create-react-app |
| B. | npm install -f create-react-app |
| C. | npm install -g create-react-app |
| D. | install -g create-react-app |
| Answer» D. install -g create-react-app | |
| 5. |
In which of the following directory React Components are saved? |
| A. | Inside js/components/ |
| B. | Inside components/js/ |
| C. | Inside vendor/js/components/ |
| D. | Inside vendor/components/ |
| Answer» B. Inside components/js/ | |
| 6. |
How many elements can a valid react component return? |
| A. | React doesn t return element |
| B. | 1 Element |
| C. | More than 1 element |
| D. | None of the mentioned |
| Answer» C. More than 1 element | |
| 7. |
React.js is written in which of the following language? |
| A. | C |
| B. | C++ |
| C. | JavaScript |
| D. | Java |
| Answer» D. Java | |
| 8. |
Which of the following acts as the input of a class-based component? |
| A. | Class |
| B. | Props |
| C. | Factory |
| D. | None of the mentioned |
| Answer» C. Factory | |
| 9. |
What is React.js? |
| A. | Open-source JavaScript back-end library |
| B. | JavaScript front-end library to create a database |
| C. | Free and open-source JavaScript front-end library |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |