Building User-Friendly dApp Interfaces BDC Practice Questions (Page 8)

Questions 36–40

1. 36application · medium

   A dApp team is integrating MetaMask for user authentication. They want to ensure that the user's account address is verified without requiring the user to sign a message every time they visit. What is the recommended approach?

   • AStore the user's address in a cookie after the first connection and trust it on subsequent visits.
   • BUse the wallet's public API to fetch the address without any signature.
   • CAsk the user to enter their private key into the dApp to verify ownership.
   • DUse a signed message (e.g., personal_sign) to authenticate the user and store the signature in local storage for the session.
   Reveal Solution Discussion Select an answer first
2. 37foundation · easy

   When designing onboarding for a dApp, why is it helpful to automatically detect the user's network (e.g., Ethereum mainnet vs. testnet) and prompt them to switch if needed?

   • ATo increase the speed of transactions by selecting the fastest network.
   • BTo automatically switch the user's wallet to a network that has lower gas fees.
   • CTo allow the dApp to access the user's private keys on that network.
   • DTo ensure the user is on the correct network for the dApp to function properly, reducing errors.
   Reveal Solution Discussion Select an answer first
4. 38application · medium

   A dApp team is committed to WCAG 2.1 AA compliance. They are reviewing their color palette and notice that some text has a contrast ratio of 3:1. What should they do?

   • AAdd a tooltip to the low-contrast text to make it readable.
   • BUse a different font family to improve readability.
   • CIncrease the contrast ratio to at least 4.5:1 for normal text.
   • DKeep the 3:1 ratio because it meets the requirement for large text.
   Reveal Solution Discussion Select an answer first
5. 39foundation · easy

   What does 'responsive design' mean in the context of dApp interfaces?

   • AThe interface responds quickly to user interactions without any delay.
   • BThe interface uses animations to respond to every user action.
   • CThe interface automatically adjusts its layout and elements to fit different screen sizes and devices.
   • DThe interface changes its color scheme based on the user's mood.
   Reveal Solution Discussion Select an answer first
6. 40foundation · easy

   When integrating MetaMask into a dApp, what is the purpose of calling `ethereum.request({ method: 'eth_requestAccounts' })`?

   • ATo send a transaction to the blockchain and wait for confirmation.
   • BTo check if MetaMask is installed in the browser.
   • CTo request the user's permission to connect their wallet and access their public account address.
   • DTo retrieve the user's private key for the dApp to use in signing.
   Reveal Solution Discussion Select an answer first