BLOCKCHAIN - BTA Certified Blockchain Developer - Ethereum Set 1

1.

GETH:

is the reference implementation of the Ethereum protocol and every other node implementation internally uses the closed-source from Geth. 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. is one of the many blockchain nodes that implement the Ethereum Protocol. It's open source and everyone can contribute. C

2.

To store almost all data in the Ethereum Blockchain:

a Linked List with pointers to previous blocks hashes is used. a Merkle Patricia Trie is used. a Radix Trie is used because the Merkle Patricia Trie is too inefficient. B

3.

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?

750,000,000,000,000 Wei 750,000,000,000 Wei 750,000,000 Wei A flat fee of 1 Ether A

4.

Checking the balance of an address inside a loop of a smart contract constantly:

doesn't cost any gas. cost gas every time we check the balance. B

5.

Gas costs accrue on sending a transaction:

no matter the content. only with a new smart contract deployment. only interacting with an already deployed smart contract. A

6.

EVM assembly:

is much better than Solidity and a viable alternative. can be split across multiple files, but every contract must be in a file with the same name as the contract itself. is another language similar to LLL, more secure than Solidity. B

7.

Solidity files:

can't be split across multiple files, everything should be in one single file. can be split across multiple files, but every contract must be in a file with the same name as the contract itself. 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';". C

8.

Files can be imported:

using relative and absolute paths, where the "." And the ".." depict that it's a relative path. only via GitHub using the Repository and Username. using the special requirefile(...) statement, which looks in a specific library path to import files. A

9.

Importing from GitHub:

works across all compilers and platforms the same way. is generally possible, but currently works only in Remix, but doesn't work in Truffle. B

10.

Single line comments in Solidity are:

working with either // or /// working with /* comment */ or /** @.. natspec style */ not possible, all comments must be multi-line. A

BLOCKCHAIN - BTA Certified Blockchain Developer - Ethereum Set 1

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BLOCKCHAIN - BTA Certified Blockchain Developer - Ethereum Set 1

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