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ALBERTA BLOCKCHAIN ARCHITECT EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALE 2026 Q&A|INSTANT DOWNLOAD PDF
1. What is blockchain? A. Central database B. Distributed ledger C. Programming language D. API Answer: B A blockchain is a decentralized, distributed ledger of records. 2. What is a block? A. File B. Data container C. Server D. Node Answer: B A block stores transactions and metadata. 3. What links blocks together? A. URLs B. Hash pointers C. APIs D. Keys Answer: B Each block references the previous block via hash. 4. What is a hash function?
A. Encryption tool B. One-way function C. Database D. API Answer: B Transforms input into fixed-length output.
5. What is cryptographic hash property? A. Reversible B. Deterministic and irreversible C. Editable D. Compressible Answer: B Same input always gives same output, cannot reverse. 6. What is a node? A. UI B. Network participant C. Database D. API Answer: B Nodes maintain and validate blockchain. 7. What is decentralization? A. Central control B. No single authority C. Database D. API Answer: B Control is distributed across nodes.
12. What is a validator? A. UI B. Transaction verifier C. Database D. API Answer: B Confirms blockchain transactions. 13. What is immutability? A. Editable data B. Cannot be changed C. Database D. API Answer: B Data cannot be altered once recorded. 14. What is a smart contract? A. UI B. Self-executing code C. Database D. API Answer: B Automates agreement execution. 15. What is Ethereum? A. Coin B. Smart contract platform C. Database D. API
Answer: B Ethereum supports smart contracts.
16. What is Bitcoin? A. Smart contract platform B. Digital currency C. Database D. API Answer: B Bitcoin is the first blockchain currency. 17. What is gas in blockchain? A. Fuel B. Transaction cost C. Database D. API Answer: B Computational fee for executing operations. 18. What is a wallet? A. Storage box B. Key manager C. Database D. API Answer: B Stores private and public keys. 19. What is a private key? A. Public data B. Secret access key
A. Split chain B. Database update C. API D. UI Answer: A Chain splits into two versions.
24. What is hard fork? A. UI B. Non-backward compatible change C. Database D. API Answer: B Creates new blockchain version. 25. What is soft fork? A. UI B. Backward compatible update C. Database D. API Answer: B Old nodes still recognize new blocks. 26. What is node synchronization? A. UI B. Updating ledger C. Database D. API Answer: B Keeps all nodes consistent.
27. What is mining difficulty? A. UI B. Puzzle complexity C. Database D. API Answer: B Controls block creation speed. 28. What is nonce? A. UI B. Random number in mining C. Database D. API Answer: B Used to solve hash puzzle. 29. What is mempool? A. UI B. Pending transactions C. Database D. API Answer: B Stores unconfirmed transactions. 30. What is block reward? A. UI B. Mining incentive C. Database D. API Answer: B Reward for creating block.
Answer: B Unique digital asset.
35. What is DeFi? A. UI B. Decentralized finance C. Database D. API Answer: B Financial systems without banks. 36. What is DAO? A. UI B. Decentralized organization C. Database D. API Answer: B Governed by smart contracts. 37. What is Layer 1 blockchain? A. UI B. Base network C. Database D. API Answer: B Main blockchain like Bitcoin. 38. What is Layer 2 solution? A. UI B. Scaling layer
C. Database D. API Answer: B Improves scalability.
39. What is Lightning Network? A. UI B. Bitcoin scaling C. Database D. API Answer: B Fast off-chain transactions. 40. What is sharding? A. UI B. Data splitting C. Database D. API Answer: B Divides blockchain load. 41. What is consensus finality? A. UI B. Transaction confirmation C. Database D. API Answer: B Ensures permanent record. 42. What is 51% attack?
46. What is dApp? A. UI B. Decentralized application C. Database D. API Answer: B Runs on blockchain. 47. What is oracle in blockchain? A. UI B. External data provider C. Database D. API Answer: B Bridges real-world data. 48. What is IPFS? A. UI B. Decentralized storage C. Database D. API Answer: B Distributed file system. 49. What is gas optimization? A. UI B. Reduce cost C. Database D. API Answer: B Minimizes transaction fees.
50. What is scalability in blockchain? A. UI B. Handle more transactions C. Database D. API Answer: B Improves network throughput. 51. What is blockchain scalability? A. More nodes B. Handling higher transaction throughput C. Encryption D. Mining Answer: B Scalability is the ability to process more transactions efficiently. 52. What is throughput in blockchain? A. Storage size B. Transactions per second C. Hash rate D. Block size Answer: B Measures how many transactions a network can process. 53. What is latency in blockchain networks? A. Block size B. Transaction delay C. Mining speed D. Hash power Answer: B Time taken for a transaction to be confirmed.
Answer: B Transactions are assumed valid unless proven otherwise.
58. What is zero-knowledge proof? A. Encryption B. Proof without revealing data C. Mining D. Token type Answer: B Proves validity without exposing information. 59. What is zk-SNARK? A. Token standard B. Zero-knowledge protocol C. Wallet type D. Node system Answer: B Efficient cryptographic proof system. 60. What is zk-STARK? A. Wallet B. Scalable zero-knowledge proof C. Mining D. API Answer: B More scalable transparent proof system. 61. What is blockchain interoperability? A. Mining B. Cross-chain communication
C. Hashing D. Storage Answer: B Allows different blockchains to interact.
62. What is cross-chain bridge? A. Wallet B. Asset transfer system C. Mining pool D. Node Answer: B Transfers assets between blockchains. 63. What is oracle attack? A. UI bug B. Manipulated external data C. Mining failure D. Hash error Answer: B Fake external data can corrupt smart contracts. 64. What is Chainlink? A. Wallet B. Decentralized oracle network C. Token D. Exchange Answer: B Chainlink provides real-world data to blockchains. 65. What is MEV (Maximal Extractable Value)?
69. What is reentrancy attack? A. Network attack B. Recursive contract call exploit C. Hash attack D. Mining issue Answer: B Allows repeated withdrawals before state update. 70. What is DAO hack? A. Token issue B. Smart contract exploit event C. Mining failure D. Node crash Answer: B Historical exploit of decentralized organization. 71. What is multisig wallet? A. Single key wallet B. Multiple approval wallet C. Mining tool D. Token system Answer: B Requires multiple signatures for transactions. 72. What is cold wallet? A. Online storage B. Offline storage C. Mining node D. API Answer: B Secure offline private key storage.
73. What is hot wallet? A. Offline storage B. Internet-connected wallet C. Mining system D. Node Answer: B Convenient but less secure. 74. What is key management system? A. Mining tool B. Secure key storage and usage C. Hash function D. Token system Answer: B Manages cryptographic keys securely. 75. What is blockchain governance? A. Mining B. Decision-making process C. Wallet system D. Hashing Answer: B Defines protocol changes and rules. 76. What is on-chain governance? A. Offline voting B. Blockchain-based voting C. Mining system D. API
