in BlockChain by

Blockchain Intermedio Questions and Answers on:

  • Blockchain Ledger
  • Blockchain Transactions
  • CAP Theorem
  • Permissioned blockchains
  • Private Blockchain
  • Public Blockchain
  • Smart Contracts
  • External data sources
  • Ethereum
  • Cryptography 

1 Answer

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Question#1 Blockchain is a distributed______.

a) Server

b) Ledger

c) System

d) Computer

Answer:- Ledger

Question#2 _____ are a set of rules that verify and add transactions to a blockchain.

a) Blocks

b) Consensus mechanisms

c) Mathematical formulas

d) Laws

Answer:- Consensus mechanisms

Question#3 What does C stands for in CAP theorem?

a) Computation

b) Capacity

c) Correct

d) Consistency

Answer:- Consistency

Question#4 Bitcoin is a public, permisionless blockchain.

a) True

b) False

Answer:- True

Question#5 Miners are rewarded with tokens like bitcoins and ether for mining the blocks.

a) True

b) False

Answer:- True

Question#6 What is the total number of bitcoins that can ever exist?

a) 21 millions

b) 21 billions

c) 1 millions

d) 100 millions

Answer:- 21 millions

Question#7 Which type of blockchains are controlled by a particular person or organization?

a) Private

b) Public

c) Personal

d) Consortium

Answer:- Private

Question#8 _____ is a process of verifying transactions, bundling them into blocks, and adding those blocks to the blockchain.

a) Mining

b) Digging

c) Filtering

d) Coding

Answer:- Mining

Question#9 A peer to peer network of autonomous computers is a ______.

a) Distributed System

b) Client

c) Server

d) Super Computer

Answer:- Distributed System

Question#10 _____ contains hash of previous block and all the important information required by the block.

a) Block Header

b) Block Metadata

c) Chain

d) Block Footer

Answer:- Block Header

Question#11 Permissioned blockchains usually use PBFT algorithms.

a) True

b) False

Answer:- True

Question#12 The Proof of Elapsed Time (PoET) concept was developed by ______ in early 2016.

a) Intel

b) Apple Computer

c) Microsoft

d) IBM

Answer:- Intel

Question#13 _____ relies on exchange of messages among nodes that follow a distributed protocol to come to an agreement.

a) Proof of Work

b) Proof of Stake

c) PBFT Algorithm

d) Proof of identity

Answer:- PBFT Algorithm

Question#14 Which release of Ethereum will have Proof of Stake Consensus algorithm.

a) Juniper

b) Serenity

c) Constantinople

d) Casper

Answer:- Serenity

Question#15 Which consensus algorithm requires the users to have a stake in the blockchain?

a) Proof of Work

b) proof of stake

c) proof of identity

d) proof of elapsed time

Answer:- proof of stake

Question#16 In private blockchains, you can create your own tokens for transactions.

a) True

b) False

Answer:- True

Question#17 Consensus algorithms must be fault tolerant.

a) True

b) False

Answer:- True

Question#18 Ether tokens can be used to buy Gas.

a) True

b) False

Answer:- True

Question#19 A smart contract is a business logic or a legal agreement that is coded using a programming language.

a) True

b) False

Answer:- True

Question#20 Oracles provide a trustless way of getting external information.

a) True

b) False

Answer:- True

Question#21 ______ are systems that provide external data sources to smart contracts.

a) True

b) False

Answer:- True

Question#22 ______ are systems that provide external data sources to smart contracts.

a) Fortunes

b) Tokens

c) Routers

d) Oracles

Answer:- Oracles

Question#23 What are the main tokens used as digital currency in Ethereum?

a) Bitcoin

b) Gas

c) Litecoin

d) Ether

Answer:- Ether

Question#24 Which type of cryptography uses only private keys?

a) Symmetric

b) Asymmetric

c) Private

d) Public

Answer:- Symmetric

Question#25 _____ are the set of the rules and regulations that control the working of a blockchain.

a) Laws

b) Governance

c) Protocols

d) Consensus

Answer:- Governance

Question#26 What are the two types of forks?

a) Simple,Complicated

b) Temporary, Permanent

c) Alive, Dead

d) Hard Fork, Soft Fork

Answer:- Hard Fork, Soft Fork

Question#27 Which type of cryptography uses two cryptographic keys?

a) Secure

b) Private

c) Dual Key Cryptography

d) Asymmetric

Answer:- Asymmetric

Question#28 Public blockchains are goverened by communities.

a) True

b) False

Answer:- True

Question#29 A hash function should produce different output strings for the same input data.

a) True

b) False

Answer:- False

Question#30 Ethereum is a programmable blockchain.

a) True

b) False

Answer:- True

Question#31 _____ are a collection of key-value pairs, with state changes recorded as transactions on the ledger.

a) Assets

b) Transactions

c) Tokens

d) Blocks

Answer:- Assets

Question#32 _____ is a javascript library that allows you to interact with Ethereum.

a) Angular

b) web3.js

c) JQuery

d) D3.js

Answer:- web3.js

Question#33 You can have private test networks in Ethereum.

a) True

b) False

Answer:- True

Question#34 Which of the following blockchain is used for non currency, industrial application?

a) Hyperledger

b) Ethereum

c) Bitcoin

d) Litecoin

Answer:- Hyperledger

Question#35 What are the two types of accounts in ethereum?

a) Public, Private

b) Programmable, Non Programmable

c) External, Contract

d) Secure, Open

Answer:- External, Contract

Question#36 ______ is a way of verifying the authenticity of digital messages and documents over the internet.

a) Digital Imprint

b) Password

c) Digital Signature

d) Fingerprint

Answer:- Digital Signature

Question#37 What are the tokens used as computational fee in ethereum blockchain?

a) Dollars

b) Ether

c) Gas

d) Bitcoin

Answer:- Gas

Question#38 Which release of Ethereum will have Proof of Stake Consensus algorithm.

a) Juniper

b) Serenity

c) Constantinople

d) Casper

Answer:- Serenity

Question#39 What are the two main types of cryptography?

a) Strict, Not strict

b) Symmetric, Asymmetric

c) Local, Global

d) Private, Public

Answer:- Symmetric, Asymmetric

Question#40 _____ is a software defining assets, and the transaction instructions modifying those assets

a) Chaincode

b) Transaction code

c) Byte code

d) Asset code

Answer:- Chaincode

Question#41 Hyperledger platform was developed by ______.

a) Linux Foundation

b) Microsoft

c) IBM

d) IBM

Answer:- Linux Foundation

Question#42 Which consensus algorithm requires a complex, computation intensive mathematical problem to be solved.

a) PBFT

b) PoS

c) PoW

d) PoI

Answer:- PoW

Question#43 What are the two types of accounts in ethereum?

a) Public, Private

b) Programmable, Non Programmable

c) Secure, Open

d) External, Contract

Answer:- External, Contract

Question#44 Which type of cryptography is also called public key cryptography?

a) Asymmetric

b) Symmetric

c) Public

d) Dual Key Cryptography

Answer:- Asymmetric

Question#45 Ethereum is a public blockchain.

a) True

b) False

Answer:- True

Question#46 Nodes are independent computing units of a distributed system.

a) True

b) False

Answer:- True

Question#47 Hyperledger Fabric is a private blockchain.

a) True

b) False

Answer:- True

Question#48 In ______ mechanism, the miner is selected based on reputation built over time.

a) Stake based

b) Elapsed Time

c) Reputation based

d) Power based

Answer:- Reputation based

Question#49 What is the Consensus algorithm used by Ethereum?

a) Dagger hashimoto

b) Eth Consensus

c) Ethash

d) Ethereum Hash

Answer:- Ethash
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