Ethereum Developer Ethereum Virtual Machine (EVM) and Gas Optimization 2

Question 1

What is 'gas' in the context of the Ethereum network?

Accepted Answer

A unit measuring the computational work required to execute operations

Answer

Gas is a unit that measures the computational effort required to execute specific operations, preventing infinite loops and metering resource usage.

Question 2

What is the approximate gas cost of writing to a new (zero-to-nonzero) storage slot using SSTORE?

Accepted Answer

20,000 gas

Answer

Writing to a new storage slot (cold zero-to-nonzero SSTORE) costs approximately 20,000 gas, making persistent storage the most expensive EVM resource.

Question 3

After EIP-1559, what happens to the base fee portion of a transaction fee?

Accepted Answer

It is burned and permanently removed from circulation

Answer

EIP-1559 introduced a base fee that is burned with every transaction, creating a deflationary pressure on ETH supply.

Question 4

In Ethereum's EIP-1559 fee model, what is the 'priority fee' (tip)?

Accepted Answer

An optional fee paid directly to validators to incentivize faster inclusion

Answer

The priority fee (maxPriorityFeePerGas) is an optional tip paid directly to the block proposer to incentivize including a transaction in the current block.

Question 5

What triggers a gas refund in Ethereum smart contracts?

Accepted Answer

When a storage slot is cleared by writing zero to a non-zero value

Answer

Clearing a storage slot (writing zero to a previously non-zero slot) provides a partial gas refund, incentivizing state cleanup and reducing blockchain bloat.

Ethereum Developer Practice Test

Ethereum Developer Practice Test

Ethereum Developer Ethereum Virtual Machine (EVM) and Gas Optimization 2