Blockchain Integration with Emerging Technologies BDC Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   How can blockchain secure patient data in healthcare?

   • ABy using a single shared password for all patients
   • BBy storing all patient data in plaintext on a public ledger
   • CBy providing an immutable, encrypted record of patient data access and changes
   • DBy allowing any healthcare provider to modify records without consent
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A blockchain platform uses ECDSA signatures and SHA-256 hashing. A security audit warns that quantum computers could eventually break ECDSA. The team must choose a migration path that minimizes disruption while preparing for quantum threats. Which approach is most balanced?

   • AWait until quantum computers are commercially available before making any changes
   • BAdopt a hybrid signature scheme that combines ECDSA with a quantum-resistant algorithm, while keeping SHA-256 for hashing
   • CImmediately replace all signatures with a hash-based signature scheme and change the hashing algorithm to a new one
   • DSwitch to a proof-of-stake consensus to avoid the need for signatures altogether
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which blockchain feature is most directly used to secure IoT device communication by ensuring that messages are not tampered with?

   • ASmart contract automation
   • BImmutable ledger
   • CConsensus mechanisms
   • DTokenization
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is a key benefit of using blockchain for digital twins?

   • AEnhanced traceability of the digital twin's data history
   • BGuaranteed real-time performance
   • CReduced need for any data encryption
   • DAutomatic deletion of sensitive data
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A research institute aggregates large datasets from multiple sources for a public health study. They need to prove the provenance of each dataset and allow selective sharing with partners, but the datasets are too large to store on-chain. Which approach is most appropriate?

   • AUse a traditional database and rely on digital signatures from each source, with no shared ledger
   • BUpload the entire datasets to a public blockchain for maximum transparency
   • CUse a sidechain to store all raw data, but keep the main chain for payments
   • DStore dataset hashes and metadata on a permissioned blockchain, with actual data stored off-chain and access controlled by smart contracts
   Reveal Solution Discussion Select an answer first