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問題 #1

Using selfdestruct(beneficiary) with the beneficiary being a contract without a payable fallback function:

A. selfdestruct doesn't send anything to a contract, it just re-assigns the owner of the contract to a new person. Sending ether must be done outside of selfdestruct.
B. it's impossible to secure a contract against receiving ether, because selfdestruct will always send ether to the address in the argument. This is a design decision of the Ethereum platform.
C. will throw an exception, because the fallback function is non-payable and thus cannot receive ether.

問題 #2

What's the difference between Ethereum Request for Comments (ERC) and Ethereum Improvement Proposals (EIP)?

A. ERC are an open platform to discuss continuous forking of the Ethereum platform. Successful forks are then incorporated in the EIP for further voting by the Ethereum Consortium.
B. ERC are here to define standards for the usage of Ethereum. EIP are here to improve the Ethereum Protocol itself.
C. ERC are here to propose new distributed applications on top of the Ethereum layer, while EIP are here to improve existing mining software.

問題 #3

When solidity is compiled then also Metadata is generated:

A. the ABI array and the Metadata are not generated when solidity is compiled to bytecode, its generated by a migration software which deploys the smart contract on the blockchain.
B. the Metadata contains the ABI Array, which defines the Interface to interact with the Smart Contract. Metadata can also contain the address of the smart contract when it gets deployed.
C. metadata contains the address, and the size of the smart contract. The ABI Array is generated externally upon deploying the smart contract.

問題 #4

Sending one Ether is actually internally translated:

A. to Wei, so it will send the equivalent of 10^18 Wei.
B. to Finney, so it will send the equivalent of 10^3 Finney.
C. to Szabo, so it will send the equivalent of 10^6 Szabo.

問題 #5

View and Pure Functions:

A. a function marked as pure can change the state, while a view function can only return static calls.
B. a function marked as view can never access state variables, while pure functions are here to return only one value.
C. a view function can access state variables, but not write to them. A Pure function cannot modify or read from state.

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