Blockchain Technology Concepts and Distributed Ledger Technology (DLT) BDC Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A hospital network wants to give patients control over who can access their medical records. They plan to store record metadata on a blockchain and use smart contracts to manage access permissions. Which benefit does this approach provide over a traditional centralized access-control system?

   • AThe blockchain automatically backs up records to multiple hospitals, ensuring high availability
   • BThe blockchain encrypts all medical records so that only patients can decrypt them
   • CThe blockchain eliminates the need for any access-control mechanism because data is public
   • DPatients can grant and revoke access through transparent, auditable smart contracts that no single hospital can alter
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2. 2application · medium

   A real-estate platform wants to automate the transfer of property ownership when a buyer pays the agreed amount. They plan to use a smart contract that holds the funds in escrow and releases them to the seller when the payment is confirmed. Which property of smart contracts makes this automation reliable?

   • AThe contract can be modified by the seller at any time to adjust the terms
   • BThe contract can access external APIs to verify the buyer's bank balance in real time
   • CThe contract code executes deterministically and identically on all nodes, so the outcome is the same for every participant
   • DThe contract is stored in an encrypted form that only the involved parties can decrypt
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4. 3application · medium

   A developer is designing a private blockchain for a logistics company. They want to ensure that if a single node's database is corrupted, the node can detect the corruption and resynchronize from peers. Which feature of blockchain structure enables this?

   • AThe network uses a central coordinator to periodically compare all node databases
   • BEach block contains the hash of the previous block, allowing a node to verify the chain's integrity from the genesis block
   • CEach node stores a full copy of all transactions in a relational database with foreign key constraints
   • DEach transaction is encrypted with the node's public key, so corrupted data cannot be decrypted
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5. 4foundation · easy

   In which industry is blockchain commonly applied to create a tamper-proof record of patient data?

   • AAgriculture
   • BRetail
   • CConstruction
   • DHealthcare
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6. 5application · medium

   A group of 15 universities wants to create a shared credential-verification system. They want to control who can join the network and who can validate transactions, but they also want to avoid the cost and latency of a public blockchain. Which deployment model is most appropriate?

   • ACentralized database with a shared API for all universities
   • BConsortium blockchain where the universities are the only validators
   • CPublic blockchain with a smart contract that restricts validation to the universities
   • DPrivate blockchain owned and operated by a single university
   Reveal Solution Discussion Select an answer first