blockchain cbbf practice test

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