Blockchain MCQ Questions And Answers
This section focuses on "Basics" of Blockchain. These Multiple Choice Questions (MCQ) should be practiced to improve the Blockchain skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.
1. A blockchain is a type of?
A. Object
B. Database
C. Table
D. View
View Answer
Ans : B
Explanation: Blockchain is a specific type of database.
2. Blockchains store data in the form of?
A. line
B. circle
C. block
D. rhombus
View Answer
Ans : C
Explanation: It differs from a typical database in the way it stores information; blockchains store data in blocks that are then chained together.
3. In Bitcoin case, blockchain is used in a __________way.
A. decentralized
B. centralized
C. Both A and B
D. None of the above
View Answer
Ans : A
Explanation: In Bitcoins case, blockchain is used in a decentralized way so that no single person or group has control—rather, all users collectively retain control.
4. Decentralized blockchains are immutable?
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Decentralized blockchains are immutable, which means that the data entered is irreversible. For Bitcoin, this means that transactions are permanently recorded and viewable to anyone.
5. A blockchain, originally block chain, is a growing list of records, called blocks, that are linked using?
A. Timestamp
B. hash
C. Merkle tree
D. Cryptography
View Answer
Ans : D
Explanation: A blockchain, originally block chain, is a growing list of records, called blocks, that are linked using cryptography.
6. Who first proposed a blockchain-like protocol?
A. Stuart Haber
B. W. Scott Stornetta
C. David Chaum
D. Dave Bayer
View Answer
Ans : C
Explanation: Cryptographer David Chaum first proposed a blockchain-like protocol in his 1982 dissertation "Computer Systems Established, Maintained, and Trusted by Mutually Suspicious Groups.
7. The first blockchain was conceptualized by a person (or group of people) known as Satoshi Nakamoto in?
A. 2005
B. 2008
C. 2006
D. 2004
View Answer
Ans : B
Explanation: The first blockchain was conceptualized by a person (or group of people) known as Satoshi Nakamoto in 2008.
8. Which of the following statement is true about blockchain?
A. A blockchain is a decentralized, distributed, and oftentimes public, digital ledger consisting of records called blocks
B. A blockchain database is managed autonomously using a peer-to-peer network and a distributed timestamping server
C. A blockchain has been described as a value-exchange protocol.
D. All of the above
View Answer
Ans : D
Explanation: All of the above statement are true.
9. Blocks hold batches of valid transactions that are hashed and encoded into a?
A. merkle tree
B. cryptographic hash
C. genesis block
D. temporary fork
View Answer
Ans : A
Explanation: Blocks hold batches of valid transactions that are hashed and encoded into a Merkle tree.
10. The block time is the average time it takes for the network to generate one extra block in the blockchain.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, The block time is the average time it takes for the network to generate one extra block in the blockchain.
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