Blockchain Developer Test 6

Question 1

What are the applications of Smart Contract

Accepted Answer

All of the above

Answer

Smart contracts have diverse applications across numerous sectors due to their ability to automate and enforce agreements without intermediaries. They can streamline logistics and supply chain management in transportation, automate claims processing in insurance, and facilitate digital rights management for protecting copyrighted content. Their versatility makes them valuable in many industries.

Question 2

What is the meaning of EVM

Accepted Answer

Ethereum Virtual Machine

Answer

EVM stands for Ethereum Virtual Machine. It is the core runtime environment for executing smart contracts on the Ethereum blockchain. The EVM is a Turing-complete virtual machine that ensures deterministic and secure execution of decentralized applications, allowing developers to build complex logic that operates reliably across the network.

Question 3

The scenario where one digital token is spent multiple times because the token generally consists of a digital file that can easily be cloned is known as

Accepted Answer

Double-spending

Answer

Double-spending is a critical problem in digital currencies where a single digital token is illicitly spent more than once. Unlike physical cash, digital files can be easily copied, making this a significant challenge. Blockchain technology was specifically designed with distributed ledgers and consensus mechanisms to prevent double-spending, ensuring that each transaction is unique and irreversible once confirmed.

Question 4

It is the situation where malicious miners/ attackers are present in the majority of a blockchain network

Accepted Answer

51% attack

Answer

A 51% attack occurs when a single entity or group gains control of more than 50% of a blockchain network's mining or staking power. With this majority, the attacker can manipulate the network by preventing new transactions from being confirmed, reversing confirmed transactions (double-spending), and effectively reorganizing the blockchain's history, thereby undermining its security and integrity.

Question 5

_______ transactions are the transactions occurring on the cryptocurrency network that moves value outside the network

Accepted Answer

Off-chain

Answer

Off-chain transactions are those that occur outside the main blockchain network, often processed using payment channels or sidechains. These transactions typically offer faster processing times and lower fees compared to on-chain transactions. They are eventually settled or recorded on the main chain, helping to improve the scalability and efficiency of blockchain networks by reducing congestion on the primary ledger.

Blockchain Practice Test

Blockchain Practice Test

Blockchain Developer Test 6