NFT Minting and Burning Mechanics 2

Question 1

In ERC-721, which internal function is typically called to create a new token and assign it to an address?

Accepted Answer

_mint(to, tokenId)

Answer

_transfer(from, to, tokenId)

Answer

_approve(to, tokenId)

Answer

_burn(tokenId)

Question 2

What event must be emitted when a token is minted in a compliant ERC-721 contract?

Accepted Answer

Transfer event with from set to the zero address

Answer

Approval event

Answer

Mint event with to set to msg.sender

Answer

Burn event with tokenId

Question 3

When a token is burned in ERC-721, what is the 'to' address in the emitted Transfer event?

Accepted Answer

The zero address (0x0)

Answer

The contract owner's address

Answer

The previous owner's address

Answer

The contract's own address

Question 4

Why does OpenZeppelin's _mint revert if the destination is the zero address?

Accepted Answer

Minting to address(0) would be indistinguishable from a burn

Answer

The zero address cannot pay gas

Answer

It would exceed the max supply

Answer

Solidity forbids passing address(0)

Question 5

What happens to the totalSupply tracking when a token is burned in an enumerable ERC-721?

Accepted Answer

It decreases by one

Answer

It stays the same

Answer

It increases by one

Answer

It resets to zero

Question 6

Which access control pattern best restricts who can call a mint function?

Accepted Answer

A modifier like onlyOwner or onlyRole(MINTER_ROLE)

Answer

Making the function payable

Answer

Marking the function as view

Answer

Adding a nonReentrant guard alone

Question 7

In a burn function, what check should occur before destroying a token?

Accepted Answer

That the caller is the owner or approved for the token

Answer

That the token price has increased

Answer

That gas price is below a threshold

Answer

That the contract is paused