Oracles in Blockchain MCQs

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1. : In blockchain, what is an oracle?





2. : Which is the most widely used decentralized oracle network?





3. : Oracles in blockchain primarily solve the problem of?





4. : What does a price feed oracle provide?





5. : Which type of oracle gathers data from external sources and sends it on-chain?





6. : An outbound oracle is used to?





7. : Chainlink was founded in which year?





8. : Which blockchain problem do oracles directly address?





9. : What are hardware oracles?





10. : An example of a software oracle is?





11. : Which is a key risk associated with centralized oracles?





12. : Decentralized oracles are preferred because they?





13. : Chainlinkā€™s native token is?





14. : Which type of oracle is used for weather-based insurance smart contracts?





15. : What does a randomness oracle provide to smart contracts?





16. : Which blockchain uses Band Protocol as an oracle solution?





17. : In oracles, the term ā€œdata feedā€ refers to?





18. : Oracles act as a bridge between?





19. : A cross-chain oracle allows?





20. : Which oracle service provides decentralized randomness (VRF)?





21. : Band Protocol is built on which blockchain ecosystem?





22. : Which of the following is NOT an oracle provider?





23. : What role do oracles play in DeFi applications?





24. : What is API3ā€™s main focus in oracle solutions?





25. : Which consensus problem do oracles NOT solve?





26. : Which oracle model relies on multiple validators for data accuracy?





27. : Which type of smart contracts need oracles the most?





28. : Which oracle type is important for sports betting dApps?





29. : A key limitation of oracles is known as?





30. : What does the ā€œoracle problemā€ refer to?





31. : Which oracle project focuses on APIs directly from data providers?





32. : Provable (formerly Oraclize) provides what type of service?





33. : Which industry uses IoT hardware oracles the most?





34. : Which oracle system integrates with Polkadotā€™s ecosystem?





35. : Decentralized oracle networks often use what to ensure accuracy?





36. : DIA in oracle systems stands for?





37. : A stablecoin pegged to USD requires which type of oracle?





38. : Which oracle helps generate random numbers for gaming dApps?





39. : Which oracle is critical for cross-chain communication?





40. : Which oracle project focuses on transparency of data feeds?





41. : What ensures trust in decentralized oracles?





42. : Which oracle is needed for flight insurance smart contracts?





43. : Which of the following is NOT a use case for oracles?





44. : Which oracle network uses ā€œaggregatorsā€ to combine multiple data sources?





45. : Oracles that provide election results are examples of?





46. : The blockchain cannot directly access real-world data because it is?





47. : Oracles are often described as the ___ of blockchains.





48. : A hybrid oracle combines?





49. : Which oracle is most useful for decentralized gambling apps?





50. : The ultimate goal of blockchain oracles is?





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