Blockchain CBBF Practice Test - Questions Answers, Page 2
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Blockchains work best when they are____________________.
A.
combined with other technologies
B.
used for financial applications
C.
used alone
D.
used as an alternative to a database
What is a hash function?
A.
A one-way function that converts input to a unique string output
B.
A function that stores data behind a key
C.
A two-way function used for condensing information
D.
The block-ID of the block
E.
All the above
Blockchains are being implemented in the food supply chain because_____________.
A.
consumers demand to know where their food comes from
B.
it allows farm to table accountability for safety
C.
they have the potential to provide fast, specific supplier data
D.
it prevents food waste if a food contamination problem occurs
E.
All of the above
Which of the following are practical use cases for Blockchain?
A.
Voting
B.
A video sharing website
C.
Medical records
D.
Identity management
E.
All of the above
Which item(s) make up a block header?
A.
The hash of the Merkle root and the header of the previous block
B.
The hash of every transaction in a specific block and the next block
C.
The time stamp of the block and the genesis block hash
D.
The hash of the previous block
How is Blockchain benefiting voting?
A.
By revealing the identity of each voter and who or what they voted for
B.
By controlling who gets to vote
C.
By only allowing a certain number of votes per person
D.
By allowing voters to trust their vote has been counted
Which of the following statements sums up the Proof of Work consensus process?
A.
Miners complete to find a nonce results in a hash that starts with a predetermined number of leading zeros.
B.
Miners put up a stake. A miner is then selected based on stake value to add a new block to the chain. If a miner adds an invalid block to the chain, that miner loses their stake.
C.
All nodes agree on the data of the transaction.
D.
Miners send assets to an inactive address. This process selects the next owner of a block.
The Ethereum Blockchain provides a/an _____________ virtual machine.
A.
Windows compatible
B.
energy efficient
C.
Linux compatible
D.
turing-complete
Which Blockchain protocol uses Proof of Work Consensus? Select all that apply
A.
Hyperledger
B.
Corda
C.
Bitcoin
D.
Ethereum
E.
All of the above
One of the big issues that new financial transaction Blockchain solutions face is____________.
A.
increasing the number of transactions per second (TPS)
B.
the inability to find use cases
C.
solving user identity
D.
getting banks to cooperate
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