Ethereum Developer Ethereum Virtual Machine (EVM) and Gas Optimization

Question 1

What is the primary function of the Ethereum Virtual Machine (EVM)?

Accepted Answer

To execute smart contract bytecode in a sandboxed environment

Answer

The EVM executes smart contract bytecode in an isolated, deterministic sandboxed environment across all Ethereum nodes.

Question 2

What is the native word size of the Ethereum Virtual Machine?

Accepted Answer

256 bits

Answer

The EVM uses a 256-bit word size, aligning with Ethereum's 256-bit cryptographic hash functions (keccak256).

Question 3

Which of the following is NOT a valid data location in the EVM?

Accepted Answer

Cache

Answer

The EVM has four data locations—stack, memory, storage, and calldata—cache does not exist as a distinct EVM data location.

Question 4

What does the EVM opcode SSTORE do?

Accepted Answer

Writes a value from the stack into persistent contract storage

Answer

SSTORE pops a key and value from the stack and writes the 32-byte value into the contract's persistent storage at that key.

Question 5

What is Ethereum bytecode?

Accepted Answer

Low-level instructions executed directly by the EVM

Answer

Bytecode is the compiled, low-level instruction set that the EVM directly interprets and executes during transactions.

Ethereum Developer Practice Test