Blockchain Intermedio Interview Question-Answer

Q.1 Blockchain is a distributed______.

       A. Server

       B. Ledger

       C. System

       D. Computer

Ans : Ledger


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

       A. Blocks

       B. Consensus mechanisms

       C. Mathematical formulas

       D. Laws

Ans : Consensus mechanisms


Q.3 What does C stands for in CAP theorem?

       A. Computation

       B. Capacity

       C. Correct

       D. Consistency

Ans : Consistency


Q.4 Bitcoin is a public, permisionless blockchain.

       A. True

       B. False

Ans : True


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

       A. True

       B. False

Ans : True


Q.6 What is the total number of bitcoins that can ever exist?

       A. 21 millions

       B. 21 billions

       C. 1 millions

       D. 100 millions

Ans : 21 millions


Q.7 Which type of blockchains are controlled by a particular person or organization?

       A. Private

       B. Public

       C. Personal

       D. Consortium

Ans : Private


Q.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

Ans : Mining


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

       A. Distributed System

       B. Client

       C. Server

       D. Super Computer

Ans : Distributed System


Q.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

Ans : Block Header


Q.11 Permissioned blockchains usually use PBFT algorithms.

       A. True

       B. False

Ans : True


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

       A. Intel

       B. Apple Computer

       C. Microsoft

       D. IBM

Ans : Intel


Q.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

Ans : PBFT Algorithm


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

       A. Juniper

       B. Serenity

       C. Constantinople

       D. Casper

Ans : Serenity


Q.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

Ans : proof of stake


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

       A. True

       B. False

Ans : True


Q.17 Consensus algorithms must be fault tolerant.

       A. True

       B. False

Ans : True


Q.18 Ether tokens can be used to buy Gas.

       A. True

       B. False

Ans : True


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

       A. True

       B. False

Ans : True


Q.20 Oracles provide a trustless way of getting external information.

       A. True

       B. False

Ans : True


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

       A. True

       B. False

Ans : True


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

       A. Fortunes

       B. Tokens

       C. Routers

       D. Oracles

Ans : Oracles


Q.23 What are the main tokens used as digital currency in Ethereum?

       A. Bitcoin

       B. Gas

       C. Litecoin

       D. Ether

Ans : Ether


Q.24 Which type of cryptography uses only private keys?

       A. Symmetric

       B. Asymmetric

       C. Private

       D. Public

Ans : Symmetric


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

       A. Laws

       B. Governance

       C. Protocols

       D. Consensus

Ans : Governance


Q.26 What are the two types of forks?

       A. Simple,Complicated

       B. Temporary, Permanent

       C. Alive, Dead

       D. Hard Fork, Soft Fork

Ans : Hard Fork, Soft Fork


Q.27 Which type of cryptography uses two cryptographic keys?

       A. Secure

       B. Private

       C. Dual Key Cryptography

       D. Asymmetric

Ans : Asymmetric


Q.28 Public blockchains are goverened by communities.

       A. True

       B. False

Ans : True


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

       A. True

       B. False

Ans : False


Q.30 Ethereum is a programmable blockchain.

       A. True

       B. False

Ans : True


Q.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

Ans : Assets


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

       A. Angular

       B. web3.js

       C. JQuery

       D. D3.js

Ans : web3.js


Q.33 You can have private test networks in Ethereum.

       A. True

       B. False

Ans : True


Q.34 Which of the following blockchain is used for non currency, industrial application?

       A. Hyperledger

       B. Ethereum

       C. Bitcoin

       D. Litecoin

Ans : Hyperledger


Q.35 What are the two types of accounts in ethereum?

       A. Public, Private

       B. Programmable, Non Programmable

       C. External, Contract

       D. Secure, Open

Ans : External, Contract


Q.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

Ans : Digital Signature


Q.37 What are the tokens used as computational fee in ethereum blockchain?

       A. Dollars

       B. Ether

       C. Gas

       D. Bitcoin

Ans : Gas


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

       A. Juniper

       B. Serenity

       C. Constantinople

       D. Casper

Ans : Serenity


Q.39 What are the two main types of cryptography?

       A. Strict, Not strict

       B. Symmetric, Asymmetric

       C. Local, Global

       D. Private, Public

Ans : Symmetric, Asymmetric


Q.40 _____ is a software defining assets, and the transaction instructions modifying those assets

       A. Chaincode

       B. Transaction code

       C. Byte code

       D. Asset code

Ans : Chaincode


Q.41 Hyperledger platform was developed by ______.

       A. Linux Foundation

       B. Microsoft

       C. IBM

       D. IBM

Ans : Linux Foundation


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

       A. PBFT

       B. PoS

       C. PoW

       D. PoI

Ans : PoW


Q.43 What are the two types of accounts in ethereum?

       A. Public, Private

       B. Programmable, Non Programmable

       C. Secure, Open

       D. External, Contract

Ans : External, Contract


Q.44 Which type of cryptography is also called public key cryptography?

       A. Asymmetric

       B. Symmetric

       C. Public

       D. Dual Key Cryptography

Ans : Asymmetric


Q.45 Ethereum is a public blockchain.

       A. True

       B. False

Ans : True


Q.46 Nodes are independent computing units of a distributed system.

       A. True

       B. False

Ans : True


Q.47 Hyperledger Fabric is a private blockchain.

       A. True

       B. False

Ans : True


Q.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

Ans : Reputation based


Q.49 What is the Consensus algorithm used by Ethereum?

       A. Dagger hashimoto

       B. Eth Consensus

       C. Ethash

       D. Ethereum Hash

Ans : Ethash


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