Blockchain JavaScript Developer set 1

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Free Online Best Blockchain JavaScript Developer MCQ Questions for improve your basic knowledge of Blockchain JavaScript. This Blockchain JavaScript Developer set 1 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 Mining difficulty?

A	Mining difficulty is a function that is easy to compute in one direction but difficult to compute in the opposite direction unless you have special information.
B	Mining difficulty is the degree that determines how hard it is for miners in terms of hashing power to find an eligible hash aka signature for their block
C	Mining difficulty is Obtaining The Latest Block,Adding New Blocks
D	Mining difficulty is the first transaction in a block. It is a unique type of bitcoin transaction that can be created by a miner.

Question 2

What are the different types of tokens?

A	Platform
B	Privacy
C	Currency
D	All of the above

Question 3

What is Testnet?

A	Testnet is used by bitcoin to offers an alternative blockchain that is used for testing
B	Testnet utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.
C	Testnet is a hidden public key as you have been using is a type of transaction
D	Testnet is a public key visible in the transaction and is a type of transaction .

Question 4

What is the name of the research paper that brought Bitcoin to the world?

A	Black Paper
B	White Paper
C	Yellow Paper
D	Green Paper

Question 5

What is the process of creating new bitcoins popularly known as?

A	Finding
B	Panning
C	Sourcing
D	Mining

Question 6

Particular transactions consist of a______________

A	transactionId (id of transaction),
B	input Account (sender) and outputs Account (receiver), ,
C	fee,the amount,type,misc
D	timestamp,hash

Question 7

What is Segregated Witness?

A	Segregated Witness is a process where the block size limit on a blockchain is increased by removing the signature data from bitcoin transactions.it frees up space and allows to add more transactions
B	Segregated Witness is used by bitcoin to offers an alternative blockchain that is used for testing
C	Segregated Witness is a hidden public key as you have been using is a type of transaction
D	Segregated Witness utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.

Question 8

What are Sidechains?

A	Sidechains is another term for a hash function
B	Sidechains is Smart Contracts that have forked off the main Blockchain
C	Sidechains is a parallel network running adjacent to the main blockchain network for additional security
D	Sidechains is any mechanism that allows tokens from one blockchain to be securely used within a completely separate Blockchain

Question 9

What is Block Created When attribute?

A	Block Created When attribute is used when the block was created
B	Block Created When attribute is used for the position of the block on the blockchain.
C	Block Created When attribute is used when data stored on the block. This could be any exchange of value really
D	Block Created When attribute is used to hash of the previous block. This ties one block to another.

Question 10

What is work of Hash attribute?

A	Hash attribute used to calculate hash function using the properties of the block. This is the block identifier on the blockchain
B	Hash attribute used when the block was created
C	Hash attribute used to find the position of the block on the blockchain.
D	Hash attribute is a type of data to be stored on the block. This could be any exchange of value really. Perhaps an array of sorts.

Question 11

What is a Trapdoor function, and why is it needed in blockchain development?

A	Trapdoor function is the degree that determines how hard it is for miners in terms of hashing power to find an eligible hash aka signature for their block
B	Trapdoor function is a function that is easy to compute in one direction but difficult to compute in the opposite direction unless you have special information.
C	Trapdoor function is Obtaining The Latest Block,Adding New Blocks
D	Trapdoor function is the first transaction in a block. It is a unique type of bitcoin transaction that can be created by a miner.

Question 12

The Message-digest 5 (Md5) algorithm is the integrity of data ______________

A	Md5 is a process where the block size limit on a blockchain is increased by removing the signature data from bitcoin transactions.it frees up space and allows to add more transactions
B	Md5 utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.
C	Md5 is the number of blocks in the chain between any specific block and the first chain block on the chai
D	Md5 is a function that generates a 128-bit hash value. It’s common to create a file that holds checksum files and that ensures

Question 13

What is Pay to Pubkey (P2PK)?

A	It is a public key visible in the transaction and is a type of transaction .
B	It is a hidden public key as you have been using is a type of transaction
C	utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.
D	It is used by bitcoin to offers an alternative blockchain that is used for testing

Question 14

What is Block height?

A	Block height is a process where the block size limit on a blockchain is increased by removing the signature data from bitcoin transactions.it frees up space and allows to add more transactions
B	Block height is a function that generates a 128-bit hash value. It’s common to create a file that holds checksum files and that ensures
C	Block height utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.
D	Block height is the number of blocks in the chain between any specific block and the first chain block on the chai

Question 15

What is Pay to PubKey hash (P2PKh)?

A	P2PKh is a hidden public key as you have been using is a type of transaction
B	P2PKh is a public key visible in the transaction and is a type of transaction .
C	P2PKh is used by bitcoin to offers an alternative blockchain that is used for testing
D	P2PKh utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.

Question 16

What is Block Transaction attribute?

A	Block Transaction attribute is a type of data to be stored on the block. This could be any exchange of value really. Perhaps an array of sorts.
B	Block Transaction attribute is a position of the block on the blockchain.
C	Block Transaction attribute used when the block was created
D	Block Transaction attribute used to hash of the previous block. This ties one block to another.

Question 17

What is BlockIndex attribute?

A	BlockIndex attribute is the position of the block on the blockchain.
B	BlockIndex attribute is the hash of the previous block. This ties one block to another.
C	BlockIndex attribute is a type of data to be stored on the block. This could be any exchange of value really.
D	BlockIndex attribute is used to block

Question 18

List of attributes to create a block:

A	BlockIndex
B	Block Created When
C	Block Transaction
D	Block Previous Hash

Question 19

What is Block Previous Hash attribute?

A	Block Previous Hash attribute used to hash of the previous block. This ties one block to another.
B	Block Previous Hash attribute used when the block was created
C	Block Previous Hash attribute a type of data to be stored on the block. This could be any exchange of value really. Perhaps an array of sorts.
D	Block Previous Hash attribute is the position of the block on the blockchain.

Question 20

What is Elliptic Curve Digital Signature Algorithm?

A	Elliptic Curve Digital Signature Algorithm utilized by bitcoin to ensure ownership of funds. It is used to generate the public/private keys and can also include the signature.
B	Elliptic Curve Digital Signature Algorithm is used by bitcoin to offers an alternative blockchain that is used for testing
C	Elliptic Curve Digital Signature Algorithm is a public key visible in the transaction and is a type of transaction .
D	Elliptic Curve Digital Signature Algorithm is a hidden public key as you have been using is a type of transaction

Question 21

When a record is on a blockchain, who can access it?

A	Multiple people simultaneously.
B	One person at a time.
C	Only the people involved in the transaction.
D	All of the Above

Question 22

Who invented Merkle Trees?

A	Ralph Merkle
B	Ralph Wiggum
C	Nick Szabo
D	Vitalik Buterin

Question 23

What is not a ledger type considered by users in Blockchain?

A	Distributed Ledger
B	Decentralized Ledger
C	Both a and b
D	None of the above

Question 24

What is a Dash Masternode?

A	Dash Masternode is a node whereTwo nodes sharing resources
B	Dash Masternode is a single node that runs the whole network
C	Dash Masternode is a node that provides additional supervisory network services
D	Dash Masternode is Master of all Dash nodes

Question 25

What do you mean by Coinbase transaction?

A	Coinbase transaction is the first transaction in a block. It is a unique type of bitcoin transaction that can be created by a miner.
B	Coinbase transaction is a function that is easy to compute in one direction but difficult to compute in the opposite direction unless you have special information.
C	Coinbase transaction is the degree that determines how hard it is for miners in terms of hashing power to find an eligible hash aka signature for their block
D	Coinbase transaction is Obtaining The Latest Block,Adding New Blocks

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