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Question 1

When defining a new datatype:

Options :

A : its best to use a contract with public storage variables, so it can be used like a class

B : it-s best to use a struct, which is cheaper than deploying a new contract

C : it-s not possible to generate new datatypes in Solidity

Answer: B

Question 2

It’s possible to access the blockchain via an Ethereum Node:

Options :

A : only via JavaScript because there is the proprietary Web3.js library.

B : by any programming language, as long as it adheres to the JSON-RPC standard.

Answer: B

Question 3

The JSON-RPC Protocol:

Options :

A : is used to communicate between blockchain nodes

B : is used to ensure safe communication between miners

C : is a mean of dumping the blockchain data in a so-called consensus export

D : is used to communicate between the blockchain node and externally running applications

Answer: D

Question 4

Public Keys vs. Private Keys. Which statement is true?

Options :

A : The Public Key is for Signing Transactions, the Private Key must be given out to verify the signature.

B : The Private Key signs transactions, the Public Key can verify the signature

C : The Private Key is to generate a Public Key. The Public Key can sign transactions, the address is here to verify the transactions

Answer: B

Question 5

Smart Contracts can be written in:

Options :

A : Java, C++, Solidity and JavaScript, because the Ethereum Blockchain is completely language agnostic and cross compilers exist for every major language

B : Solidity, Viper, LLL and Serpent, because those are high level languages that are compiled down to bytecode.

C : Solidity and JavaScript, because those are the official first implementations for Distributed applications and the Blockchain supports those languages fully.

Answer: B