Blockchain JavaScript Developer set 3

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Free Online Best Blockchain JavaScript MCQ Questions for improve your basic knowledge of Blockchain JavaScript. This Blockchain JavaScript Developer set 3 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

What is Token?

A	Token can be created anywhere in the world and delivered via Ethereum, EOS, or another capable blockchain platform.
B	Token is an unregulated censorship resistant shadow currency
C	Token is a private network
D	Token is an another name for BlockChain

Question 2

For bitcoin, a node that can create blocks is called a______________

A	Miner
B	bookkeeping node
C	block producer.
D	Hyperledger

Question 3

________ introduced Bitcoin.

A	Satoshi Nakamoto
B	Samsung
C	China
D	John Mcafee

Question 4

For NEO, a node that has management rights is called a______________-

A	bookkeeping node
B	block producer.
C	Miner
D	Hyperledger

Question 5

Bitcoin is based on __________ blockchain.

A	Private
B	Public
C	Public Permissioned
D	Permissioned

Question 6

What is Private Blockchain?

A	Private Blockchain Provides the premission as who can read and who can transfer the data
B	Private Blockchain is a binary tree that holds all the hashed pairs of the tree
C	Private Blockchain is Backward to the previous block
D	Private Blockchain is Not linked with each other

Question 7

What are Miners?

A	Miners are those Users who use their computational power to mine for blocks.
B	Miners are the chains of blocks where each block contains data of value without any central supervision. It is cryptographically secure and immutable.
C	Miners are the mechanism by which a decentralized network comes to a consensus on certain matters
D	Miners are said to be decentralized because there is no central authority supervising anything.

Question 8

Name some details that are sent to the block of bitcoin?

A	Merkle root
B	Hash
C	Nonce
D	All of the Above

Question 9

For EOS, a node running the underlying network layer and able to process all transactions is called a______________

A	block producer
B	Miner
C	bookkeeping node
D	Hyperledger

Question 10

What is Proof of Stake?

A	Proof of Stake provides a similar hashing block scheme to bitcoin’s PoW, but it limits the number of peers
B	Proof of Stake is a slang term coined in association with cryptocurrency to describe holding cryptocurrency disregarding price fluctuation.
C	Proof of Stake is the first and most popular mechanism used by bitcoin and Ethereum, which are the most popular cryptocurrencies at the time of writing
D	Proof of Stake attack happens when multiple systems are attacking a target’s system resource/bandwidth.

Question 11

What is Bitcoin?

A	Bitcoin is a technology that underpins Hyperledger Fabric
B	Bitcoin is a another name for BlockChain
C	Bitcoin is a an unregulated censorship resistant shadow currency
D	Bitcoin is a private network

Question 12

What is Bitcoin improvement proposal (BIP)?

A	BIP is a document for introducing features or information to bitcoin.
B	BIP is an SHA256 hash of the previous block’s header. This ensures integrity because changing one previous block will require changing each previous block.
C	BIP is a binary tree that holds all the hashed pairs of the tree
D	BIP is an arbitrary number that miners change to modify the header hash in order to produce a hash that is less than or equal to the target threshold

Question 13

What is the use of Prune?

A	Utilizing Prune, you can limit the disk usage, set this to 3000
B	By setting a limited maxconnections value, you are limiting the maximum nodes number to ten connections
C	you reduce the size of the UtXo cache from 300 MiB to 100 MiB
D	All of these

Question 14

The configuration file holds the following params:-

A	Prune
B	dbcache
C	Maxconnections
D	All of these

Question 15

Popular cryptocurrency coins that use PoS _____________

A	Dash
B	NEO
C	LSK
D	All of the Above

Question 16

A good example of Private Block Chain is______________

A	Record Keeper Blockchain
B	Corda
C	Hyperledger
D	All of these

Question 17

In blockchain, blocks are linked __________

A	Backward to the previous block
B	Forward to next block
C	Not linked with each other
D	linked with each other

Question 18

What is Hash rate?

A	Hash rate is a binary tree that holds all the hashed pairs of the tree
B	Hash rate is the number of calculations in a second that your computer can perform trying to solve the mathematical puzzle
C	Hash rate is a document for introducing features or information to bitcoin.
D	Hash rate is an arbitrary number that miners change to modify the header hash in order to produce a hash that is less than or equal to the target threshold

Question 19

How many properties are there of Blockchain?

A	1
B	2
C	3
D	4

Question 20

Blockchain can be stored as which of the following?

A	A flat file
B	A Database
C	Both of the above
D	None of these

Question 21

Which of the following is popularly used for storing bitcoins?

A	Box
B	Stack
C	Wallet
D	Pocket

Question 22

_________ was first cryptocurrency to come in to market.

A	Bitcoin
B	Nonce
C	Merkle root
D	Hash

Question 23

What is the use of Maxconnections?

A	By setting a limited maxconnections value, you are limiting the maximum nodes number to ten connections
B	Utilizing Prune, you can limit the disk usage. set this to 3000
C	you reduce the size of the UtXo cache from 300 MiB to 100 MiB
D	All of these

Question 24

What is the use of dbcache?

A	you reduce the size of the UtXo cache from 300 MiB to 100 MiB
B	By setting a limited maxconnections value, you are limiting the maximum nodes number to ten connections
C	Utilizing Prune, you can limit the disk usage. set this to 3000
D	All of these

Question 25

What is HODL?

A	HODL is a slang term coined in association with cryptocurrency to describe holding cryptocurrency disregarding price fluctuation.
B	HODLprovides a similar hashing block scheme to bitcoin’s PoW, but it limits the number of peers
C	HODL attack happens when multiple systems are attacking a target’s system resource/bandwidth.
D	HODL is the first and most popular mechanism used by bitcoin and Ethereum, which are the most popular cryptocurrencies at the time of writing

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Blockchain JavaScript Developer set 3

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