MCQs

Let’s recap the important concepts with MCQs.

1. In a React QR Code Generator, which hook is used to manage user input?

A. useEffect()
B. useContext()
C. useState()
D. useReducer()

Answer: C

2. What is the primary purpose of a QR Code Generator application?

A. To scan QR codes
B. To convert URLs or text into scannable QR codes
C. To encrypt data
D. To create barcodes only

Answer: B

3. What input does a user typically provide to generate a QR code?

A. Image
B. Color
C. Text or URL
D. Email

Answer: C

4. What is the purpose of the onClick event in the Generate button?

A. To change the button style
B. To run the QR code creation logic
C. To update input fields
D. To reload the page

Answer: B

5. Which JavaScript library is commonly used to generate QR codes in web projects?

A. jQuery
B. Axios
C. Chart.js
D. qrcode or qrcode-generator

Answer: D