Blockchain Integration with Emerging Technologies BDC Practice Questions (Page 6)

Questions 26–30

1. 26application · medium

   A food distributor wants to trace the origin of every product from farm to store, and automatically trigger recalls when a batch is found contaminated. They also need to share traceability data with regulators without exposing commercial secrets. Which blockchain integration approach best meets these needs?

   • AUse a sidechain for each supplier to store their own data
   • BUse a centralized database with no blockchain
   • CStore all traceability data on a public blockchain for full transparency
   • DRecord product movement events on a permissioned blockchain and use smart contracts to trigger recalls based on batch status
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   What is a play-to-earn model enabled by blockchain?

   • APlayers earn cryptocurrency or tokens by achieving in-game goals
   • BPlayers earn in-game currency that cannot be traded
   • CPlayers pay to play with no possibility of earning
   • DPlayers earn points that expire after a day
   Reveal Solution Discussion Select an answer first
4. 28expert · hard

   A decentralized finance (DeFi) platform wants to allow users to swap tokens between two different blockchains without trusting a centralized exchange. They also want to minimize the risk of funds being locked if one chain fails mid-transaction. Which interoperability mechanism best meets these requirements?

   • AUse a sidechain that is pegged to the main chain
   • BUse a centralized exchange to facilitate the swap
   • CUse atomic swaps that execute the trade only if both chains confirm the transaction
   • DUse a bridge that locks tokens on one chain and mints wrapped tokens on the other
   Reveal Solution Discussion Select an answer first
5. 29application · medium

   A utility company wants to allow households with solar panels to sell excess energy directly to neighbors. They need transparent billing and automated settlement. Which blockchain feature is most essential?

   • AA centralized billing system with a trusted third party
   • BSmart contracts that automatically execute peer-to-peer energy trades and record billing on a shared ledger
   • CA public blockchain that stores all energy consumption data in plaintext
   • DA sidechain that only records final settlements, with no trade history
   Reveal Solution Discussion Select an answer first
6. 30foundation · easy

   What new business model can blockchain enable in 5G networks?

   • AManual billing based on paper invoices
   • BCentralized control of all network users
   • CAutomated micro-transactions for network services via smart contracts
   • DFree unlimited data for all users
   Reveal Solution Discussion Select an answer first