Blockchain Developer Test 6 - Practice Test Geeks

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

Off-chain

Bad-chain

Remote-chain

None of these

Correct! Wrong!

Kind of attack which miner mines a block with his transaction and does not release it in the system

Race Attack

Finney Attack

The 51% Attack

None of these

Correct! Wrong!

Which of the following is an important elements in Blockchain ecosystem?

Node Application

Shared ledger

Consensus algorithm

All of the above

None of the above

Correct! Wrong!

The attacker may send the same coin to different vendors in rapid succession, probably by using two machines

Race Attack

Finney Attack

The 51% Attack

None of these

Correct! Wrong!

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

51% attack

50% attack

49% attack

55% attack

Correct! Wrong!

Which of the following is a type of Blockchain?

Inside Blockchain

Ethereum

Private Blockchain

Correct! Wrong!

What are the applications of Smart Contract

Transportations

Insurance

Protecting Copyrighted Content

All of the above

Correct! Wrong!

A Coinbase transaction is the _______ in a block. It is a unique type of bitcoin transaction that can be created by a miner.

First Transaction

Second Transaction

Third Transaction

None of these

Correct! Wrong!

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

Single-spending

Double-spending

Multiple-spending

None of the above

Correct! Wrong!

What is the meaning of EVM

Ethereum Valuable Memory

Ethereum Virtual Memory

Ethereum Virtual Machine

Ethereum Valuable Machine

Correct! Wrong!

The attacker mines a private blockchain where he double-spends the coins.

Race Attack

Finney Attack

The 51% Attack

None of these

Correct! Wrong!