Pass the Blockchain Developer - Ethereum CBDE Questions and answers with ExamsMirror

no matter the content.

only with a new smart contract deployment.

only interacting with an already deployed smart contract.

working with either // or ///

working with /* comment */ or /** @.. natspec style */

not possible, all comments must be single-line.

working with either // or ///

working with /* comment */ or /** @.. natspec style */

not possible, all comments must be multi-line.

would be better, because it can reduce the amount of energy needed for mining.

would be worse, because it would increase the amount of energy needed for mining.

True, but it's still good to use Ganache, or even a real private network for testing.

False, it's necessary to use Ganache or even a real private network for testing.

The tokens of a certain ERC20 symbol are all the same, the tokens of an ERC721 symbol are all different. So, ERC20 tokens are fungible, while ERC721 tokens are non-fungible.

The tokens of a certain ERC20 symbol are all different, the tokens of an ERC721 symbol are all the same. So, ERC20 tokens are non-fungible while ERC721 tokens are fungible.

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.

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

it's best to use a struct, which is cheaper than deploying a new contract.

it's not possible to generate new datatypes in Solidity.

2, because the decimal is truncated.

3, because it's always rounded.

2.5, because it's automatically converted into a float.

by the miner nodes which make sure that a transaction is valid.

by every single node in the blockchain network executing the same transaction.

by a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible.