Question 1

Consider the following scenario. A startup is building a chat app for smart phones where the messages sent between users are anonymous and get destroyed within 24 hours of being sent.

Which architecture would best solve the product need?

Options :

A : Ethereum for token management and chat messages; Mobile apps use JSON-RPC to communicate directly with Smart Contracts

B : Private blockchain to persist chat messages; Custom built token system with private blockchain smart contract

C : Token management for shareholders in a public blockchain; Mobile apps and data management built on existing multitier systems without use of blockchain

D : Hybrid blockchain for token management with Proof of Stake; private blockchain to persist the chat messages

Answer: C

Question 2

What is the language that Solidity is using to build on the Ethereum Virtual Machines(EVM)?

Options :

A : .Net

B : Javascript

C : C++

D : Node.js

E : PHP

Answer: B

Question 3

Which of these technical components best represents why cryptocurrency is able to operate successfully?

Options :

A : An immutable digital ledger that is validated and distributed across many peers

B : Using API calls, cryptocurrency having a direct correlation to USD exchange rates

C : High performance computing power allows cryptocurrency to be minted just as a central government might do with fiat currency

D : Blockchain cryptocurrency transactions are always public which generates user trust and adoption

Answer: A

Question 4

If a Proof of Work blockchain such a s Bitcoin or Ethereum changed to a Proof of Stake consensus paradigm, which key component of the Proof of Work process would be eliminated?

Options :

A : There would be no need for the miners or nodes to perform a guessing game

B : The need to solve Byzantine Fault Tolerance

C : All fees related to transactions would be removed

D : The blockchain network would no longer have to display public transactions

Answer: A

Question 5

Which of the following would create a blockchain transaction?

Options :

A : Updating a Smart Contract

B : Updating an internal State variable

C : Exchanging solution tokens

D : All of the above

Answer: C