Blockchain Quiz For Practice

Welcome to your BlockChain Quiz

A Decentralized application would (typically) not require a midtier as it connects directly to the Ethereum Network.

True

False

Casper is the future POS Consensus model for Ethereum?

True

False

You have been given the task of designing a Private network. In which order of preference would you suggest the consensus model.

PoW

PoS

PoA

There are 2 types of accounts supported by the wallet:

Single Signature & Multi Signature

Simple/Externally owned accounts & Contract accounts

Private Account & Public accounts

Wallets are used only for external account management?

True

False

Contract deployment requires payment of a fee known as gas.

True

False

To secure the Geth client which option would you use?

- -rpc

- -secure

- -netrestrict

For Geth the default logging level is :

0, silent

1, error

2, warning

3, info

4, core

5, debug

6, detail

You would like to create a testing environment for development. What network id will use use?

1

2

3 [Testnet]

4

The fastest way to sync geth client to testnet is to

use - -dev option

Use machine with huge RAM/CPU

use - -syncmode = light

Geth if launched without the --network id or --testnet will connect to the _____ network?

Live

Rinkeby

Ropstein

Local

Gas refers to the _________

Token

Unit for fee

EVM resource management

It's ok to use geth --dev for setting up a peer for participating in a live network

True

False

The option --network id 4 is the same as one of the following:

- -rinkeby

The attach command starts the geth client

True

False [It attaches a console to a running geth client]

Use the ______ option to execute script in a non-interactive mode

Console

attach

Exec

Preload

You have started a geth client and would like to connect to the console from another machine, you would use one of the following to do so

geth attach ipc/geth.ipc

geth attach http://…:8545

geth console ws://…:8545

Account in Geth is ______ by default

Created

Locked

Unlocked

An account keyfile is protected by _______

Password [ password protected keyfile stores Private keys]

Private key

Directory features (hidden)

You cannot retrieve your account if you lose your password

True

False

Mining is enabled by default in geth

True

False

In mining __________ gets the reward ethers

default account

Coinbase

Etherbase

any of the above

EVM stands for ___________

Ethereum Virtual Machine

Ethereum Validation Methodology

Ethereum Value Metadata

pragma solidity ^0.4.6; Provides instruction to the compiler that ___________

code is compatible with specified version and below

code is compatible with specified version and above

code is compatible with version 0.4.6 only

Ethereum Proof of Authority protocol

Casper

Ghost

Clique

EThash

You have used a DAPP to send a transaction but for some reason. you are not sure if the transaction went through or not. You have your account address so you can use the _______ for checking

Ethreum Wallet

Dapp

Ethereum Explorer (etherscan)

There are multiple Ethereum network types. An enterprise organization is concerned about risk of losing data, so the may go for _______ chain

Live Network

Test network

Private network

Hashing functions generate a fix length hash string for the input data that can be decrypted back to the data using the decrypting logic

True

False

Miner needs to solve a puzzle in ___________

Proof of Work

Proof of Stake

Proof of Authority

The Ethereum Proof of Work protocol is known as the ________ protocol

Casper

Ghost

Clique

ETHash

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