Consensus Mechanisms MCQs

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1. : What is the main purpose of a consensus mechanism in blockchain?





2. : Which was the first consensus mechanism introduced in blockchain?





3. : Proof of Stake (PoS) replaces mining with?





4. : Which consensus mechanism does Bitcoin use?





5. : What does Proof of Authority (PoA) rely on?





6. : In Delegated Proof of Stake (DPoS), who elects block producers?





7. : Which consensus mechanism is considered most energy-intensive?





8. : Byzantine Fault Tolerance (BFT) aims to solve what problem?





9. : Which consensus model uses stake delegation for efficiency?





10. : Ethereum switched to which consensus mechanism in 2022?





11. : Which consensus mechanism is used by Solana?





12. : Proof of Burn (PoB) requires participants to?





13. : Which consensus ensures high throughput but with some centralization trade-off?





14. : In PoS, validators risk losing coins through?





15. : What makes PoA more centralized than PoW or PoS?





16. : Which consensus mechanism is the foundation of most first-generation blockchains?





17. : What is the major drawback of PoW?





18. : Which consensus is often used in private blockchains?





19. : Proof of Capacity (PoC) uses which resource?





20. : Which consensus mechanism gives faster block confirmations?





21. : What is the role of a validator in PoS?





22. : In DPoS, block producers are also called?





23. : Which consensus uses randomization for validator selection?





24. : What is the “nothing-at-stake” problem in PoS?





25. : Which consensus mechanism is used in Ripple (XRP)?





26. : Which consensus relies heavily on trust in known validators?





27. : Which consensus is most resistant to Sybil attacks due to high cost of resources?





28. : What ensures immutability in PoW consensus?





29. : Which consensus is considered most eco-friendly?





30. : The term “finality” in consensus means?





31. : Which consensus is considered hybrid in many blockchains?





32. : Avalanche consensus achieves?





33. : Which consensus is designed for high scalability?





34. : The purpose of slashing in PoS is to?





35. : Which consensus model is inspired by academic research?





36. : In BFT consensus, a network can function correctly even if up to?





37. : Which consensus is most used in enterprise (private) blockchain networks?





38. : In PoS, validators are rewarded mainly through?





39. : Which consensus mechanism uses “epochs” and “slots”?





40. : The 51% attack is most commonly associated with?





41. : Which consensus model is used in Hyperledger Fabric?





42. : Which consensus is associated with “validators” rather than “miners”?





43. : What makes DPoS faster than traditional PoS?





44. : In consensus, “Sybil attack” refers to?





45. : Which consensus algorithm is used by Stellar?





46. : Which consensus is designed to be quantum-resistant?





47. : Which consensus system is highly criticized for centralization risks?





48. : What is the main trade-off of PoS compared to PoW?





49. : Which consensus mechanism punishes offline validators?





50. : The common goal of all consensus mechanisms is?





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