Files can be imported:
A. using relative and absolute paths, where the "." And the ".." depict that it's a relative path.
B. only via GitHub using the Repository and Username.
C. using the special requirefile(...) statement, which looks in a specific library path to import files.
Solidity files:
A. can't be split across multiple files, everything should be in one single file.
B. can be split across multiple files, but every contract must be in a file with the same name as the contract itself.
C. can be spread across multiple files. To import all contract from a file you can use "import 'myfile.sol'. To import Contract MyContract from myfile.sol you use "import {MyContract as SomeContract} from 'myfile.sol';".
EVM assembly:
A. is much better than Solidity and a viable alternative.
B. can be split across multiple files, but every contract must be in a file with the same name as the contract itself.
C. is another language similar to LLL, more secure than Solidity.
Gas costs accrue on sending a transaction:
A. no matter the content.
B. only with a new smart contract deployment.
C. only interacting with an already deployed smart contract.
You interact with a smart contract and see a gas usage of 50,000 gas with a gas cost of 15Gwei. How much Ether would you have to pay to the miner?
A. 750,000,000,000,000 Wei
B. 750,000,000,000 Wei
C. 750,000,000 Wei
D. A flat fee of 1 Ether
Checking the balance of an address inside a loop of a smart contract constantly:
A. doesn't cost any gas.
B. cost gas every time we check the balance.
To store almost all data in the Ethereum Blockchain:
A. a Linked List with pointers to previous blocks hashes is used.
B. a Merkle Patricia Trie is used.
C. a Radix Trie is used because the Merkle Patricia Trie is too inefficient.
GETH:
A. is the reference implementation of the Ethereum protocol and every other node implementation internally uses the closed-source from Geth.
B. is the library that is used for the blockchain node Go-Ethereum. It is also used by Parity is parts, because it's closed source.
C. is one of the many blockchain nodes that implement the Ethereum Protocol. It's open source and everyone can contribute.
The JSON-RPC Protocol:
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.
A Blockchain Node:
A. can never become a mining node.
B. can always become a mining node.
C. can become a mining node, depending if the implementation has the functionality implemented.
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