Blockchain Quiz

What is a blockchain?

•  A centralized database

• A distributed ledger

• A type of cryptocurrency

• A computer program

Which of the following is a primary goal of a consensus mechanism in a blockchain network?

• Maximizing transaction fees

• Centralizing control

• Ensuring decentralization

• Speeding up transactions

What makes data on a blockchain secure and immutable?

• Centralized control

• Decentralization and encryption

• Frequent data updates

• Public access

What is a smart contract?

• A legally binding document

• A blockchain-based identity system

• A form of cryptocurrency

• A self-executing code that enforces an agreement

Solidity is a programming language primarily used for:

• Developing mobile apps

• Creating web applications

• Writing smart contracts for blockchain platforms

• Building operating systems

Which data type in Solidity is used to store Ethereum addresses?

• uint

• bool

• address

• string

What does the term "gas" refer to in the context of Ethereum and Solidity?

• The cost of executing code on the Ethereum network

• The fuel used to power miners

• A type of cryptocurrency

• A measurement of blockchain block size

In Solidity, how can you handle errors and exceptions?

• By ignoring them

• By reverting all changes made in a transaction

• By printing error messages to the console

• By restarting the Ethereum network

How can you deploy a Solidity smart contract on the Ethereum blockchain?

• By sending an email to the Ethereum Foundation

• By calling the contract creator on the phone

• By using a blockchain explorer

• By submitting a transaction to the Ethereum network

What are Solidity functions, and what is their purpose in a smart contract?

• Functions in Solidity are used for user authentication.

• Functions are not used in Solidity.

•  Functions define the contract's properties.

• Functions are pieces of code that can be executed and interacted with by users and other contracts.