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Home » Quiz intermediate – lessons nr 14-27

2. Intermediate Course 27. Blockchain trilemma – explanation of the problem. What is the impact on cryptocurrency payments? Quiz intermediate – lessons nr 14-27

Quiz intermediate – lessons nr 14-27

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Question 1 of 10

1. Question
Why were oracles created?
- To control smart contracts and blockchain data
- To link data from the outside world to the blockchain ecosystem
- To manipulate data on the blockchain
- To replace traditional databases
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Question 2 of 10

2. Question
What is the fundamental role of an oracle in the process of delivering data to the blockchain?
- They are the final and only source of data for smart contracts
- They execute the smart contract's logic, deciding the outcome of the transaction
- They act as an intermediary that fetches, verifies, and passes data from the outside world to the network
- They replace network validators by independently confirming the validity of blocks
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Question 3 of 10

3. Question
What are the types of oracles?
- Hardware oracles, software oracles, incoming oracles, outgoing oracles, centralized oracles, decentralized oracles, special oracles, human oracles
- Only hardware oracles and software oracles
- Ordinary oracles and intelligent oracles
- Oracles on the blockchain and oracles off the blockchain
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Question 4 of 10

4. Question
What are the main benefits of building blockchains in the Polkadot ecosystem?
- Scalability
- Security
- Collaboration with other parachains
- All of the above
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Question 5 of 10

5. Question
What are Parachains in the Polkadot ecosystem?
- Parallel blockchains
- Additional layers on top of existing blockchains
- Nodes, containing the history of each parachain
- Custom platforms for dApps and services based on smart contracts
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Question 6 of 10

6. Question
What is interoperability in the context of blockchain technology?
- The ability of different blockchain systems to connect and communicate with each other
- Exchange of data only within a single blockchain
- Restriction of access to data only for internal users of the blockchain
- No ability to communicate between different blockchains
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Question 7 of 10

7. Question
How does sharding on a blockchain work?
- It involves dividing the entire blockchain network into smaller parts called shards to increase scalability
- It is only used for small blockchain networks
- Does not affect the scalability of the blockchain network
- It involves centralizing data on the blockchain network
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Question 8 of 10

8. Question
What is a mainnet?
- A test network used to test new applications and features before deploying them to the mainnet
- A secure and fully functional version of the blockchain where actual transactions take place
- A blockchain consensus used in test networks
- A way to verify transactions in the blockchain protocol
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Question 9 of 10

9. Question
What is the concept of Proof of Useful Work (PoUW) as described in the lesson about the Flux ecosystem?What projects have been built in the Flux ecosystem?
- A technique of dividing the blockchain into smaller parts (shards) to improve scalability
- A way to use miners' computing power to solve real-world problems, instead of performing useless mathematical calculations
- A consensus model where staking tokens is required to validate transactions
- A protocol enabling communication and data exchange between different blockchain networks
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Question 10 of 10

10. Question
What is the Cosmos SDK?
- A flexible framework based on Tendermint that allows developers to easily create their own blockchains using the Go language
- The heart of the Cosmos system – a technology providing a fast and secure consensus mechanism
- A communication protocol (IBC) that allows different blockchains in the ecosystem to exchange information
- A ready-made Layer 1 blockchain that competes directly with the Ethereum network
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2. Intermediate Course

Course Home Expand All

21. What is blockchain sharding?

22. Mainnet versus Testnet on the Blockchain. The complete guide!

23. MINA Protocol: the lightest blockchain in the world!

24. Sustainable blockchain – Proof of Useful Work & Flux

25. Cosmos SDK: Building the blockchain ecosystem

26. What is cross-chain interoperability in blockchain technology?

27. Blockchain trilemma – explanation of the problem. What is the impact on cryptocurrency payments?

1 Quiz

Quiz intermediate – lessons nr 14-27

28. Non-fungible tokens and NFT exchanges

29. How to make money with NFT?

30. What is the NFT licence fee?

31. NFT Gas Fee – what is it? How can you reduce your gas fee?

32. The main differences between static NFT and dynamic NFT

33. What is minting an NFT?

34. What are NFT Ordinals? A guide to Bitcoin NFT.

35 What is KnowOrigin NFT, and how does it work?

36. ERC-6551 – the new NFT standard. What does it bring to the non-exchangeable token sector?

37. What is NFT Lending all about? An innovative solution in the world of cryptocurrencies!

1 Quiz

Quiz intermediate – lessons nr 28-37

38. The Metaverse – a new virtual world

39. Metaverse – TOP 15 virtual reality projects

40. Technical analysis – is it worth using?

2 of 4

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