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Blockchain CBSA Exam Practice Questions (P. 5)

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Question #21
The gas price is a value set by the creator of the blockchain transaction? (Select best answer.)
  1. A
    FALSE
  2. B
    Its Negotiable
  3. C
    TRUE

Correct Answer:
C
The gas price is a value set by the creator of the transaction, who has to pay gas_price * gas up front from the sending account. If some gas is left after the execution, it is refunded in the same way. If the gas is used up at any point (i.e. it is negative), an out-of-gas exception is triggered, which reverts all modifications made to the state in the current call frame.
Reference:
https://solidity.readthedocs.io/en/latest/introduction-to-smart-contracts.html#the-ethereum-virtual-machine

Question #22
R3 Corda does not organize time into blocks. What does Corda actually perform and use?

  1. A
    Ripple is implemented as the blockchain and XRP for cryptocurrency.
  2. B
    Notary services and timesmapping
  3. C
    R3 Corda is a blockchain and does use blocks
  4. D
    Notary services and timestamping

Correct Answer:
D
Review Technical Whitepaper -
https://www.corda.net/
Corda network has one or more notary services which provide transaction ordering and timestamping services, thus abstracting the role miners play in other systems into a pluggable component.

Question #23
Contracts live on the blockchain in an Ethereum-specific binary format called _____________?
  1. A
    EOS
  2. B
    EVM Code
  3. C
    Ether
  4. D
    Gas
  5. E
    EVM Bytecode

Correct Answer:
E
The Ethereum Virtual Machine (EVM) is the runtime environment for smart contracts in Ethereum. It is not only sandboxed, but actually completely isolated, which means that code running inside the EVM has no access to network, filesystem, or other processes. Smart contracts even have limited access to other smart contracts.

Question #24
Bitcoin uses what proof of work consensus system?
  1. A
    Cubehash512
  2. B
    Scrypt-Jane
  3. C
    Whirlpool
  4. D
    Scrypt-n
  5. E
    Hashcash

Correct Answer:
E
Bitcoin uses the Hashcash proof of work system.
Reference:
https://en.bitcoin.it/wiki/Hashcash

Question #25
An _____________ is a well-known service that signs transactions if they state a fact and that fact is considered to be true. They may optionally also provide the facts.
  1. A
    notary
  2. B
    oracle
  3. C
    node
  4. D
    endpoint

Correct Answer:
B
An oracle is a well known service that signs transactions if they state a fact and that fact is considered to be true. They may also optionally provide the facts r 3
Corda Technical Whitepaper.

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