Fundamental Concepts and Working Principles of Blockchain Technology BBLC Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which is a common business use case for blockchain?

   • ASending emails securely between employees.
   • BStoring large video files for streaming services.
   • CRunning a traditional relational database for a website.
   • DTracking the provenance of goods in a supply chain.
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   An insurance company wants to automate claims payouts for flight delays. They plan to use a smart contract that receives flight status data from an external source and triggers payment automatically. What is the most important consideration when relying on an external data feed in this smart contract?

   • AThe blockchain must be public to ensure the smart contract is visible to all parties.
   • BThe smart contract must be written in a language that supports real-time data streaming.
   • CThe external data source must be trusted and tamper-resistant, often via an oracle.
   • DThe smart contract must be upgraded frequently to accommodate changing flight schedules.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A food retailer wants to trace the origin of produce from farm to store to quickly identify contamination sources. They are considering a blockchain-based traceability system. What is the primary business benefit they will gain?

   • AElimination of all supply-chain intermediaries.
   • BAutomatic removal of contaminated products from store shelves.
   • CGuaranteed improvement in food quality due to the use of blockchain.
   • DA tamper-evident, end-to-end audit trail that can be shared across the supply chain.
   Reveal Solution Discussion Select an answer first
5. 24expert · hard

   A healthcare provider is required by law to allow patients to request deletion of their personal data. They are considering a blockchain to store patient consent records. Which approach best reconciles the immutability of blockchain with the legal requirement for data deletion?

   • AStore only hashes of consent documents on-chain and keep the actual documents off-chain, allowing deletion of the off-chain data.
   • BEncrypt the data on-chain and discard the encryption key when deletion is requested.
   • CStore all data on-chain and rely on the fact that deletion is not required for blockchain data.
   • DUse a blockchain that allows authorized administrators to delete blocks when required.
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A company is considering moving a high-volume payment system (thousands of transactions per second) to a public blockchain. The CTO is concerned about scalability. Which limitation of public blockchains is most directly relevant to this concern?

   • APublic blockchains are not compatible with existing payment systems, so integration is impossible.
   • BPublic blockchains have limited transaction throughput compared to centralized payment systems, due to consensus and block size constraints.
   • CPublic blockchains are always slower than private blockchains, so they cannot meet any performance requirement.
   • DPublic blockchains require all nodes to store the entire transaction history, which is a security issue.
   Reveal Solution Discussion Select an answer first