Web 3.0 Ecosystem and Components BDC Practice Questions (Page 8)

Questions 36–40

1. 36foundation · easy

   Which statement best describes a core principle of Web3?

   • AAll applications must run on a single blockchain to ensure consistency.
   • BUsers own and control their data, and transactions are verified without a central authority.
   • CUsers rely on centralized platforms to store and control their personal data.
   • DTrust is established through intermediaries such as banks or notaries.
   Reveal Solution Discussion Select an answer first
2. 37foundation · easy

   What is the role of a node provider in Web3 development?

   • ATo store dApp frontend code.
   • BTo design the user interface of dApps.
   • CTo offer access to blockchain networks without requiring developers to run their own nodes.
   • DTo write smart contracts for developers.
   Reveal Solution Discussion Select an answer first
4. 38foundation · easy

   How do smart contracts automate processes in Web3 applications?

   • AThey execute automatically when conditions are met, without intermediaries.
   • BThey require a trusted third party to execute each transaction.
   • CThey are manually triggered by users every time.
   • DThey run on centralized servers controlled by the dApp developer.
   Reveal Solution Discussion Select an answer first
5. 39application · medium

   A DeFi application is live on Ethereum, but the team wants to allow users to deposit assets from the Binance Smart Chain (BSC) without creating a new account. The team needs a solution that enables the transfer of value and data between the two blockchains. What should the team integrate?

   • AA cross-chain bridge protocol that locks assets on the source chain and mints equivalent tokens on the destination chain.
   • BA sidechain that runs in parallel to Ethereum and is secured by the same validators.
   • CAn oracle service that fetches the price of BSC assets and updates the Ethereum smart contract.
   • DA centralized exchange that users must manually use to convert their assets before interacting with the dApp.
   Reveal Solution Discussion Select an answer first
6. 40expert · hard

   A dApp requires users to sign a message to prove they own a wallet address. The team is concerned about phishing attacks where a malicious site asks users to sign a transaction that drains their funds. Which practice best protects users while still allowing the dApp to verify ownership?

   • AAsk users to provide their private key to the dApp for verification.
   • BAsk users to sign a transaction that sends 0 ETH to the dApp's address.
   • CUse a centralized server to verify the user's identity and then issue a session token.
   • DUse a sign-in with Ethereum (SIWE) message that is clearly formatted and does not include transaction data.
   Reveal Solution Discussion Select an answer first