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

To mine new Ether blocks

Answer

To manage peer-to-peer network connections

Answer

To store transaction history on disk

Question 2

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

Accepted Answer

256 bits

Answer

32 bits

Answer

64 bits

Answer

128 bits

Question 3

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

Accepted Answer

Cache

Answer

Stack

Answer

Memory

Answer

Storage

Question 4

What does the EVM opcode SSTORE do?

Accepted Answer

Writes a value from the stack into persistent contract storage

Answer

Loads a value from storage onto the stack

Answer

Stores a value in transient memory

Answer

Stops execution and returns output data

Question 5

What is Ethereum bytecode?

Accepted Answer

Low-level instructions executed directly by the EVM

Answer

Human-readable Solidity source code

Answer

The ABI specification of a contract

Answer

A JSON encoding of contract events

Question 6

What is the maximum stack depth of the EVM?

Accepted Answer

1024 items

Answer

512 items

Answer

2048 items

Answer

4096 items

Question 7

What is the key difference between CALL and DELEGATECALL opcodes?

Accepted Answer

DELEGATECALL executes the target's code in the caller's storage context

Answer

CALL is cheaper than DELEGATECALL

Answer

DELEGATECALL transfers Ether while CALL does not

Answer

CALL preserves msg.sender while DELEGATECALL does not