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lockchain Intermedio Fresco Play MCQs Answers

 lockchain Intermedio Fresco Play MCQs Answers

Test Your Knowledge



1.Nodes are independent computing units of a distributed system.

  1. 1.True
  2. 2.False
Answer: 1)True

2.Bitcoin is a public, permisionless blockchain.

  1. True
  2. False
Answer: 1)True

3.Blockchain is a distributed______.

Ledger
Server
System
computer
Answer: 1)Ledger

4._____ are a collection of transactions bundled together to be added to a blockchain.

  1. Boxes
  2. Blocks
  3. Nodes
  4. Algorithms
Answer: 2)Blocks

5._____ contains hash of previous block and all the important information required by the block.

  1. block metadata
  2. block header
  3. block footer
  4. chain
Answer: 2)block header

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

  1. 100 million
  2. 1 million
  3. 21 billion
  4. 21 million

Answer: 4)21 million

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

  1. Mathematical formulas
  2. Consensus mechanisms
  3. Blocks
  4. Laws

Answer: 2)Consensus mechanisms

8.Which of these is a distributed ledger that doesn't utilize transaction blocks?

  1. Ripple
  2. Bitcoin
  3. Ethereum
  4. R3Corda
Answer: 4)R3Corda

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

  1. public
  2. personal
  3. private
  4. consortium
Answer: 3)private

10.What does C stands for in CAP theorem?

  1. Computation
  2. Capacity
  3. Consistency
  4. Correct
 
Answer: 3)Consistency






1.Which of the following is a Leader election-based consensus mechanism?

  1. Proof of Elapsed Time
  2. Proof of Work
  3. Proof of Stake
  4. Proof of Deposit
Answer: 2)Proof of Work

2.In ______ mechanism, the miner is selected based on reputation built over time.

  1. Stake-based
  2. Power-based
  3. Elapsed Time
  4. Reputation-based
Answer: 4)Reputation-based

3.Which consensus algorithm requires the users to have a stake in the blockchain?

  1. Proof of Elapsed Time
  2. Proof of Identity
  3. Proof of Stake
  4. Proof of Work
Answer: 3)Proof of Stake

4.Decentralized platforms do not require information to pass through a single point.

  1. True
  2. False
Answer: 1)True

5.Permissioned blockchains usually use PBFT algorithms.

  1. False
  2. True
Answer: 2)True

6.Which release of Ethereum will have Proof of Stake Consensus algorithm.

  1. Juniper
  2. Serenity
  3. Casper
  4. Constantinople
Answer: 2)Serenity



1.Which style of programming is well suited for Smart Contract programming?

  1. Functional
  2. Modular
  3. Defensive
  4. Regular
Answer: 3)Defensive

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

  1. Ether
  2. Bitcoin
  3. Litecoin
  4. Gas
Answer: 1)Ether

3.The following are smart contract programming languages, except _______.

  1. Serpent
  2. Solidity
  3. Viper
  4. Erlang
Answer: 4)Erlang

4.The following blockchains support smart contracts, except ______.

  1. Bitcoin
  2. Hyperledger Fabric
  3. Corda
  4. Ethereum
 
Answer: 1)Bitcoin

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

  1. Gas
  2. Bitcoin
  3. Dollars
  4. Ether
 
Answer: 1)Gas

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

  1. Oracles
  2. Routers
  3. Fortunes
  4. Tokens
 
Answer: 1)Oracles



Test Your Knowledge



1.______ is a way of verifying the authenticity of digital messages and documents over the internet.

  1. Digital Imprint
  2. Digital Signature
  3. Password
  4. Fingerprint
 
Answer: 2)Digital Signature

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

  1. False
  2. True
 
Answer: 1)False

3._______ is a cryptographic method of converting any kind of data into a string of specified length.

  1. Dashing
  2. Encrypting
  3. Hashing
  4. Decrypting
 
Answer: 3)Hashing

4.Which type of cryptography uses two cryptographic keys?

  1. private
  2. asymmetric
  3. secure
  4. dual key cryptography
 
Answer: 2)asymmetric

5.Which type of cryptography is also called public key cryptography?

  1. public
  2. symmetric
  3. dual key cryptography
  4. asymmetric
 
Answer: 4)asymmetric

6.Which type of cryptography uses only private keys?

  1. asymmetric
  2. symmetric
  3. public
  4. private
 
Answer: 2)symmetric


1.Ethereum is a programmable blockchain.

  1. False
  2. True
 
Answer: 2)True

2.You can have private test networks in Ethereum.

  1. False
  2. True
 
Answer: 2)True

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

  1. D3.js
  2. Angular
  3. jQuery
  4. Web3.js
 
Answer: 4)Web3.js

4.What are the two types of accounts in ethereum?

  1. secure, open
  2. External, contract
  3. Programmable, non programmable
  4. public, private
 
Answer: 2)External, contract

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

  1. Bitcoin
  2. Hyperledger
  3. Ethereum
  4. Litecoin
 
Answer: 2)Hyperledger

6.Which of the following is a Ethereum test network?

  1. testnet3
  2. testnet
  3. Ethertest
  4. Ropsten
 
Answer: 4)Ropsten



Final Assessment



1.In ______ mechanism, the miner is selected based on reputation built over time.

  1. Reputation-based
  2. Stake-based
  3. Elapsed Time
  4. Power-based
 
Answer: 1)Reputation-based

2.Hyperledger platform was developed by ______.

  1. Linux foundation
  2. IBM
  3. Microsoft
  4. Intel
 
Answer: 1)Linux foundation

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

  1. Dollars
  2. Gas
  3. Ether
  4. Bitcoin
 
Answer: 2)Gas

4._____ is a mechanism that allows digital assets from one blockchain to be used as a separate blockchain.

  1. subchain
  2. forkchain
  3. Sidechain
  4. Bitcoin
 
Answer: 3)Sidechain

5.Ethereum is a public blockchain.

  1. True
  2. False
 
Answer: 1)True

6.Which type of cryptography is also called public key cryptography?

  1. dual key cryptography
  2. public
  3. asymmetric
  4. symmetric
 
Answer: 3)asymmetric

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

  1. Chaincode
  2. Transaction code
  3. Asset code
  4. Bytecode
 
Answer: 1)Chaincode

8.Nodes are independent computing units of a distributed system.

  1. False
  2. True
 
Answer: 2)True

9.What are the two types of nodes in Hyperledger Fabric?

  1. Personal and Private nodes
  2. Contract nodes and Account nodes
  3. Peer nodes and Ordering Nodes
  4. External nodes and Internal nodes
 
Answer: 3)Peer nodes and Ordering Nodes

10.Hyperledger Fabric is a private blockchain.

  1. False
  2. True
 
Answer: 2)True

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

  1. Oracles
  2. Fortunes
  3. Routers
  4. Tokens
 
Answer: 1)Oracles

12.Which style of programming is well suited for Smart Contract programming?

  1. Modular
  2. Defensive
  3. Regular
  4. Functional
 
Answer: 2)Defensive

13.What are the two main types of cryptography?

  1. Private, public
  2. Symmetric, Asymmetric
  3. Strict, not strict
  4. local, global
Answer: 2)Symmetric, Asymmetric

14._____ is a javascript library that allows you to interact with Ethereum?

  1. D3.js
  2. Angular
  3. jQuery
  4. Web3.js

Answer: 4)Web3.js

15.Which release of Ethereum will have Proof of Stake Consensus algorithm.

  1. Serenity
  2. Juniper
  3. Casper
  4. Constantinople
 
Answer: 1)Serenity

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