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Simulador Blockchain
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Questions in this quiz (20)
1Which consensus algorithm is used in Bitcoin and Litecoin?
- AProof of Authority (PoA)
- BProof of Space (PoSpace)
- CProof of Stake (PoS)
- DProof of Work (PoW)
2What is the purpose of a mining mechanism in a blockchain?
- ATo encrypt the transaction in the blockchain so that the blockchain can be secured
- BTo incentivize nodes to process new transactions and to keep an unaltered record
- CTo secure more data storage space for future valid transactions in the blockchain
- DTo speed up the flow of messages within the blockchain to improve its performance
3What is the function of a node within a blockchain network?
- AA node publishes all transactions that occur within the block.
- BA node runs the software for the network and keeps the network healthy.
- CA node stores a complete history of every transaction on the network.
- DA node stores cryptocurrency for users that buy cryptocurrency.
4When are smart contracts most useful?
- AWhen organizations appoint lawyers to execute their contracts in case of breach of trust
- BWhen organizations do not want to create traditional contracts for their physical and digital assets
- CWhen organizations want contracts to be executed automatically after a predefined event or condition is fulfilled
- DWhen organizations want to restrict the power over the execution of the contracts to the Board of Directors
5What is the definition of digital fiat currency?
- AA digital wallet solution to fund large institutions in a certain region
- BA representation of a currency of a particular nation in digital form
- CAn electronic system relying on traditional banks in an economy
- DAn innovative cryptocurrency, often used in developing nations
6How is blockchain technology used within a supply chain to increase efficiency, increase automation and reduce fraud?
- ABlockchains create a globally accessible record that multiple parties can collaborate on.
- BBlockchains create a globally accessible record that can be viewed by anyone at any time.
- CBlockchains create private records that can be collaborated on by multiple parties to increase speed
- DBlockchains create public records that can be collaborated on by multiple parties to automate
operations.
7What is necessary to transfer cryptocurrency?
- AA copy of the ledger
- BA hashed fingerprint
- CA Merkle tree root
- DA private key
8There is a possibility to migrate the whole music industry ecosystem onto a blockchain system.
How could this help to protect intellectual property rights (IP) in the music industry?- AIt could clarify ownership of licenses and make it easier to license music for commercial use.
- BIt could enable anyone to search, download and establish claims over the IP of music labels.
- CIt could enable end users to download original content freely and distribute it over their peer-to-peer (P2P) network
- DNo change is possible, and users will continue to upload and download content as they currently do.
9What is true for decentralized applications (DApps)?
- ATheir front end must be decentralized.
- BThey are always built with freeware
- CThey manage, utilize and substitute money
- DThey run on peer-to-peer (P2P) networks
- EThey work very differently from websites
10One of the most advanced and accessible blockchains in the world can be used to create tokens conform to the ERC20 standard.
Which blockchain is this?- AEthereum
- BBitcoin
- CHyperledger Fabric
- DRipple
- EWaves
11A farmer and an insurance company make a detailed agreement on which types of crop damage are insured. Payment happens automatically, if one of the insured events happen.
What main blockchain technology is used here?- AConsensus algorithm
- BDecentralized applications (DApps)
- CDistributed ledger technology (DLT)
- DSmart contracts
12A consensus algorithm uses a noncompetitive approach with transactions validated by elected nodes, that are called witnesses.
Which consensus algorithm is this?- ADelegated Proof of Stake (DPoS)
- BProof of Elapsed Time (PoET)
- CProof of Stake (PoS)
- DProof of Work (PoW)
13What is the difference between a full node and a lightweight node in a blockchain network?
- AFull nodes contain all the transaction history, lightweight nodes make a random selection of the transaction history.
- BFull nodes download all new transaction records, the lightweight nodes only download the headers of blocks.
- CFull nodes mine in order to receive cryptocurrency or tokens as a reward, the lightweight nodes do not mine.
- DFull nodes use all rules of the network, lightweight nodes use only a part of the consensus algorithm.
14What is the role of smart contracts in decentralized autonomous organizations (DAOs)?
- AThey help to execute the community members’ voting rights.
- BThey reduce and prevent conflicts in the miner community.
- CThey replace the native cryptocurrency with tokens.
- DThey speed up transactions through instant verification.
15How are valid transactions in a blockchain recorded and secured?
- AThey are recorded in the form of a block, then each block is linked and sealed to other previous blocks through hashes.
- BThey are recorded in the form of chains of hash functions, then sealed and secured through a mathematical algorithm.
- CThey are recorded through a chain of private keys, which can only be decoded by the end user through an algorithm.
- DThey are recorded through message blocks, using private key chains for securing these transactions.
16What role do hash functions play in securing blockchain networks?
- AThey are used to convert data to a unique number of any size, that help generating wallets.
- BThey determine the owner of each wallet address, by mapping all data within a blockchain.
- CThey map data of any size to a fixed size, allowing blockchains to shrink their data.
- DThey produce a string of characters, proving no data in a transaction block has changed.
17What is a token?
- AA token is a hash function to generate public and private keys for encryption of data.
- BA token is created by a single party that would like to account for something of value.
- CA token is generated by a blockchain network as a reward mechanism for nodes.
- DA token is the application of cryptography to identify all transactions in the blockchain.
18Distributed ledger technology (DLT) is a digitalized form of ledgers.
What is true for all digital ledgers?- AThey are relatively new and only invented in the 20th century.
- BThey are time-stamped and validated records of transactions.
- CThey are validated records of any bitcoin transactions.
- DThey are used as a replacement of financial transactions.
19A bearer instrument entitles the holder to all rights of ownership.
How does blockchain enable near-instant global money transfer?- ABy creating cryptocurrency from physical bearer instruments after destroying them
- BBy decentralizing the distribution of both physical and digital bearer instruments
- CBy making tokens to convert physical bearer instruments to digital fiat currency
- DBy using cryptocurrency or tokens as digital equivalents for bearer instruments
20What is a property of self-sovereign identities?
- AThey are created by an individual and managed by a third party.
- BThey are created by and managed by a government.
- CThey are managed by an individual and not a third party.
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- Curso Interno de Empresa EXIN Certifications Quiz on Simulador Blockchain, created by Maddox Doza on 27/06/2021.
- Author
- Maddox Doza
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- English
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