Ethereum – Blockchain Interview Question-Answer

Ethereum – Blockchain

Q.1 The native currency of Ethereum network is _____.

  1. Mycoin
  2. Ether
  3. Bitcoin
  4. Litecoin

Correct answer : Ether

Q.2 _________requires lots of Electricity/Energy.

  1. Proof of Stake
  2. Proof of work
  3. Proof of Authority
  4. Blockchain

Correct answer : Proof of Authority

Q.3 The main advantage of Ethereum over Bitcoin is __.

  1. Smart contracts
  2. Transaction
  3. Mining
  4. Tokens

Correct answer : Smart contracts

Q.4 What are Ethereum tokens?

  1. Native currency
  2. Alternate currency
  3. Digital asset
  4. Mining reward

Correct answer : Digital asset

Q.5 Ethereum tokens are created by using __.

  1. Application
  2. Smart contracts
  3. Dapps
  4. Software

Correct answer : Smart contracts

Q.6 How many rewards (Wei/Ether) does the miner receive for adding a block to the chain?

  1. 5 Ether
  2. 5 Wei
  3. 5*e15 Wei
  4. 5*e9 Wei

Correct answer : 5 Ether

Q.7 How many lower denominations does the Ether have?

  1. 3
  2. 10
  3. 6
  4. 5

Correct answer : 6

Q.8 What is the smallest unit of Ether?

  1. Gwei
  2. Wei
  3. Kwei
  4. Mwei

Correct answer : Wei

Q.9 The time taken for mining one block in Ethereum is _.

  1. 14 Seconds
  2. 1 Seconds
  3. 10 Seconds
  4. 10 Minutes

Correct answer : 14 Seconds

Q.10 EVM stands for _.

  1. Ethereum Virtual Machine
  2. Ether Value Mechanism
  3. Ether Value Measure
  4. Ether Virtual Measure

Correct answer : Ethereum Virtual Machine

Q.11 Based on the storage of keys, wallets are classified into __.

  1. Custodial and Non-custodial
  2. Hot and Cold
  3. Private and Public
  4. Desktop and Mobile

Correct answer : Hot and Cold

Q.12 Ethereum Client’s Command Line Interface can be used for _.

  1. Create transactions
  2. Run smart contracts
  3. Mining
  4. Join the Ethereum network
  5. All the options

Correct answer : All the options

Q.13 All normal transactions are __.

  1. Private transactions
  2. Multi-signature Transactions
  3. Public transactions
  4. Single-signature Transactions

Correct answer : Single-signature Transactions

Q.14 MetaMask wallet is a Browser Extension.

  1. True
  2. False

Correct answer : True

Q.15 Wallets and Ethereum Clients are used to interact with Ethereum network.

  1. True
  2. False

Correct answer : True

Q.16 How is transaction fee calculated?

  1. Gas Limit-Gas used) * gas price
  2. Gas used * gas price
  3. Gas used * Gas Limit
  4. Gas used + gas price

Correct answer : Gas used * gas price

Q.17 __ is a personal testnetwork that is a part of truffle suite.

  1. Kovan
  2. Ropsten
  3. Ganache
  4. Goerli

Correct answer : Ganache

Q.18 Configuration file of Truffle is?

  1. truffle-configuration.js
  2. truffle-config.ts
  3. truffle-config.js
  4. truffle.js

Correct answer : truffle-config.js

Q.19 Solidity is a _ language.

  1. Turing incomplete
  2. Turing Complete
  3. Interpreted
  4. Dynamic

Correct answer : Turing Complete

Q.20 Remix IDE cannot be used with a Browser.

  1. True
  2. False

Correct answer : False

Q.21 Remix IDE can be locally installed.

  1. True
  2. False

Correct answer : True

Q.22 Which is the command to install truffle?

  1. npm install -g truffleSuite
  2. npm install -g truffleCompiler
  3. npm install truffleSuite
  4. npm install -g truffle

Correct answer : npm install -g truffle

Q.23 Which of the following is a geth command?

  1. geth.accounts
  2. eth.account
  3. geth.getAccounts
  4. eth.getAccounts

Correct answer : geth.accounts

Q.24 If the actual Gas used in a Contract execution is less than the Gas specified by the user, the additional amount is returned.

  1. True
  2. False

Correct answer : True

Q.25 Solidity is a statically typed language.

  1. True
  2. False

Correct answer : True

Q.26 Truffle can be used for __

  1. Testing Contracts.
  2. Debugging contracts
  3. Compiling Contracts, Deploying Contracts
  4. Creating front-end for DApps
  5. All the options

Correct answer : All the options

Q.27 For EIP to become a new ERC, _____.

  1. Approved by Ethereum Committee
  2. Deployed in the Blockchain
  3. Is to follow coding standards
  4. Is to be coded properly

Correct answer : Approved by Ethereum Committee

Q.28 ______signifies the amount of gas to be spent for a transaction.

  1. Ether
  2. Gas limit
  3. Gas price
  4. Ether limit

Correct answer : Gas limit

Q.29 Which of the following is a Proof of Work implemented test network?

  1. Ganache
  2. Ropsten
  3. Rinkeby
  4. Kovan

Correct answer : Ropsten

Q.30 Which of the follwing is an extension of Solidity file?

  1. .json
  2. .sol
  3. .bat
  4. .class

Correct answer : .sol

Q.31 _______contains the Development Environment, testing Framework, and the asset pipeline.

  1. Metamask
  2. Truffle
  3. Ganache
  4. Mist

Correct answer : Truffle

Q.32 __ functions can only be called from inside the present contract, and cannot be called by the inherited contracts.

  1. External
  2. Internal
  3. Private
  4. Public

Correct answer : Private

Q.33 How the ether is brought into the Ethereum system?

  1. Issued by participation
  2. Exchanging with bitcoin
  3. Mining
  4. Buying

Correct answer : Mining

Q.34 MetaMask wallet is a __.

  1. Browser Extension
  2. Physical wallet
  3. Hot Wallet
  4. Full Node Wallet

Correct answer : Browser Extension

Q.35 Which control structure is not supported by Solidity?

  1. Switch
  2. Do while
  3. While
  4. for

Correct answer : Switch

Q.36 What is the denomination used in Ethereum?

  1. Ether
  2. Kei
  3. Wei
  4. Bitcoin

Correct answer : Wei

Q.37 Ethereum network is classified into _.

  1. Public and Consortium blockchain
  2. Public and Private blockchain
  3. Consortium and Private blockchain
  4. Public, Private and Consortium blockchain

Correct answer : Public, Private and Consortium blockchain

Q.38 _ is a collection of libraries used to create easy and better front-end for Ethereum DApps.

  1. Drizzle
  2. Truffle
  3. Ganache
  4. Crizzle

Correct answer : Drizzle

Q.39 What is the token used for executing Smart Contracts?

  1. Ether
  2. Bitcoin
  3. Gas
  4. Dollars

Correct answer : Gas

Q.40 How can one send ethers?

  1. Between accounts on the same network
  2. Between accounts on any network
  3. Between accounts on any private network
  4. All the options

Correct answer : Between accounts on the same network

Q.41 Ethereum Virtual Machine supports turing complete languages.

  1. True
  2. False

Correct answer : True

Q.42 Contract Accounts have code associated with them.

  1. True
  2. False

Correct answer : True

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1 thought on “Ethereum – Blockchain Interview Question-Answer”

  1. Since I am new to IT, I didn’t know what type of questions would I get in the interview. These Interview questions and answers article help me to get clear understanding on both questions and answers.

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