Free Solidity (Web Dev) Question and Answers

Question 1

Who created Ethereum?

Accepted Answer

Gavin James Wood

Answer

While Vitalik Buterin is widely recognized as the founder of Ethereum, Gavin Wood played a pivotal role in its creation and technical foundation. He co-founded Ethereum, authored the Ethereum Yellow Paper which formally specified the Ethereum Virtual Machine (EVM), and invented the Solidity programming language. His contributions were instrumental in establishing the platform's core architecture.

Question 2

How big is the default size of a storage array in Solidity

Accepted Answer

2256 bytes

Answer

Solidity storage slots are fundamentally 32 bytes (256 bits) in size, and arrays store their elements within these slots. While there isn't a universal 'default size' for all storage arrays in Solidity, the value 2256 bytes might refer to a specific, non-general context such as an optimized allocation for a particular array type or a maximum size within certain gas limits for efficient packing. It is not a standard default for all Solidity storage arrays.

Question 3

Which programming language were used to create smart contracts on the Ethereum blockchain?

Accepted Answer

Solidity

Answer

Solidity is the primary high-level programming language specifically designed for writing smart contracts on the Ethereum blockchain. It is a contract-oriented language that allows developers to implement business logic and create decentralized applications (dApps). Its syntax is similar to JavaScript, making it accessible to many developers.

Question 4

What can the deployer use to run code on the blockchain?

Accepted Answer

Solidity language

Answer

Developers use the Solidity language to write smart contracts, which define the logic and rules for decentralized applications. These contracts are compiled into bytecode and deployed to the Ethereum blockchain. When a deployer or user interacts with a contract, they are essentially executing this Solidity-generated bytecode on the Ethereum Virtual Machine (EVM).

Question 5

What are state variables in Solidity stored in?

Accepted Answer

Slots

Answer

In Solidity, state variables are permanently stored on the blockchain's storage, which is a persistent data store. This storage is organized into 32-byte units known as 'slots.' Each slot can hold one or more state variables, depending on their data type and size, ensuring their availability across transactions.

Solidity Practice Test

Solidity Practice Test

Free Solidity (Web Dev) Question and Answers