Blockchain Technology MCQs

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1. : What is the main purpose of blockchain technology?





2. : Which cryptocurrency was the first to use blockchain?





3. : Who is considered the creator of Bitcoin and blockchain technology?





4. : What type of database is blockchain?





5. : Which consensus mechanism is used by Bitcoin?





6. : In blockchain, what does a block contain?





7. : Which year was Bitcoin introduced?





8. : Ethereum introduced which key innovation?





9. : What is the smallest unit of Bitcoin called?





10. : Which feature ensures blockchain data cannot be changed once recorded?





11. : What is a public blockchain?





12. : Which blockchain is known for smart contracts and DApps?





13. : What does “hashing” mean in blockchain?





14. : Which algorithm is used in Bitcoin hashing?





15. : What does a miner do in blockchain?





16. : Which blockchain concept avoids double spending?





17. : What is a private blockchain?





18. : Who validates blocks in Proof of Stake (PoS)?





19. : What is the main advantage of blockchain?





20. : What does DApp stand for?





21. : Which blockchain platform was launched by IBM?





22. : What is the function of a node in blockchain?





23. : What is a blockchain fork?





24. : Which of the following is NOT a consensus mechanism?





25. : Which of these is a blockchain explorer?





26. : What is a blockchain wallet?





27. : What does “gas” mean in Ethereum?





28. : Which blockchain introduced proof-of-history?





29. : What is the process of grouping transactions into blocks?





30. : Which company launched Libra (later Diem) blockchain?





31. : In blockchain, what is a 51% attack?





32. : What is the purpose of a smart contract?





33. : Which blockchain uses ADA as cryptocurrency?





34. : Which blockchain uses DOT token?





35. : What is tokenization in blockchain?





36. : Which of the following is a privacy-focused cryptocurrency?





37. : Which consensus is energy-efficient compared to PoW?





38. : What is the maximum supply of Bitcoin?





39. : Which blockchain upgrade improves scalability using sidechains?





40. : What is the average block time of Bitcoin?





41. : What is the purpose of Merkle tree in blockchain?





42. : What is the reward for Bitcoin miners called?





43. : Which programming language is commonly used for Ethereum smart contracts?





44. : Which blockchain uses XRP as currency?





45. : What does “genesis block” mean?





46. : Which of the following is NOT a blockchain use case?





47. : What is Lightning Network mainly designed for?





48. : Which consensus algorithm uses validators chosen randomly?





49. : Which blockchain feature prevents tampering?





50. : What is a DAO in blockchain?





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