ITA203c 3

Which of the following statements is NOT true?

• a) Ethereum is an example of a
  blockchain
  

• b) The cryptocurrency used in Ethereum
  are called Bitcoins
  

• c) Hyperledger is an example of
  open-source blockchain
  

• d) The cryptocurrency used in Ethereum
  are called Ethers
  

Which of the following statements is true?

• a) In blockchains, any change or new
  transactions can be realized only by
  adding a new block of information to the
  historical transaction records.
  

• b) In blockchains, one doesn't erase or
  override the past records, it adds transactions in a chronological order to a
  growing list.
  

• c) Unlike the ledgers maintained by
  banks, Bitcoin's blockchain is replicated on networked machines around the
  world; hence it is called a "Distributed
  Ledger
  

• (d) All of the above
  

Which of the following is NOT true for Bitcoin mining?

• a) The technology uses a pair of keys for
  encryption
  

• b) The private key is used by the sender
  to encrypt the payment message
  

• c) Miners use the sender's public key
  to validate that the payment request was
  indeed made by the sender
  

• d) Miners will use the public key to compute the private key of the sender
  

Which of the following statement is true?

• a) The process of adding blocks to a
  blockchain is computationally expensive,
  and even more so to change blocks further back in the chain.
  

• b) Any miner trying to add a new block
  of data is required to provide a cryptographic proof called Proof of Work.
  

• c) To produce the Proof of Work, a miner
  will have to perform multiple rounds of
  hashing with the data of the previous
  block such that the resultant hash value
  begins with a specified number of zeros.
  

• d) All of the above
  

Which of the following is an application area for smart contracts?

• a) Supply chains are often inefficient
  because of paper-based systems and
  need for multi-party approvals, validation cost, potential for loss and fraud.
  Smart contracts can provide a secure,
  accessible digital version to all parties on
  the blockchain to automate contracts and
  payment
  

• b) Peer-to-peer buying and selling of
  goods and services (e.g., in electricity smart grids and ridesharing services)
  can benefit from smart contracts executed between various parties participating
  in the blockchain
  

• c) Buyers and sellers of insurance can
  agree on and claim reparation compensation using smart contracts.
  
  

• (d) All of the above
  

Suppose your organization needs multiple people to store and update transaction records while ensuring immutability. Which one should you choose?

• (a) Traditional database
  

• b) Blockchain
  

Suppose the requirements that yourorganization has in regards to storing transaction information can be met with either a traditional database or a blockchain. Which one should you choose?

• a) Traditional database
  

• (b) Blockchain
  

Suppose your organization needs to store transaction data that should be kept private, immutable, verifiable, but also control who can read and write to it in order to maintain scalability. What
should you choose?

• a) Traditional database
  

• (b) Permissioned blockchain
  

• c) Public blockchain
  

• d) None of the above
  

Which of the following statements is
true?

• a) A blockchain's technology and
  process ensure truthful-reporting and
  provides incentives for participation
  

• b) Cryptography principles implement
  validation of digital signatures, security,
  and immutability in a blockchain.
  

• c) A blockchain's distributed realization
  and public accessibility helps overcome censorship.
  
  

• (d) All of the above.
  

Which of the following is very inflexible?

• A. waterfall model
  

• B. agile model
  

• C. incremental model
  

• D. RUP model