Blockchain Developer Token Standards and NFTs 2

Question 1

Which ERC standard introduced a single contract capable of managing multiple token types, both fungible and non-fungible?

Accepted Answer

ERC-1155

Answer

ERC-1155 is the multi-token standard allowing one contract to handle fungible, non-fungible, and semi-fungible tokens.

Question 2

In ERC-721, what function returns the owner of a specific token ID?

Accepted Answer

ownerOf

Answer

ownerOf(tokenId) returns the address that owns the given NFT.

Question 3

What does the ERC-721 metadata function tokenURI typically return?

Accepted Answer

A URI pointing to a JSON metadata file

Answer

tokenURI returns a URI that resolves to JSON metadata describing the asset (name, image, attributes).

Question 4

Why is ERC-1155 considered more gas-efficient than deploying many ERC-721 contracts?

Accepted Answer

It supports batch transfers of multiple token types in one call

Answer

ERC-1155's safeBatchTransferFrom moves multiple token IDs and amounts in a single transaction, reducing gas.

Question 5

Which interface detection standard do ERC-721 contracts implement so others can query supported interfaces?

Accepted Answer

ERC-165

Answer

ERC-165 defines supportsInterface, used to advertise which interfaces (like ERC-721) a contract implements.

Blockchain Practice Test