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How Blockchain Works Quiz

Authored by Mohammed Mahdi Dehghan

Computers

University

Used 2+ times

How Blockchain Works Quiz
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15 questions

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1.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

Which of the following best describes the output of a SHA-256 hash function?

A fixed 64-bit output

A fixed 256-bit output

A variable-length string

An encrypted message

2.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

What is the key characteristic of SHA-256 that makes it useful in blockchain?

Fast encryption

Reversible function

Deterministic and collision-resistant

Variable output length

3.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

What does it mean when we say the blockchain is "immutable"?

It can be easily updated

Data once written cannot be changed

It is temporary

It is centralized

4.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

In blockchain, immutability is primarily ensured through:

Centralized servers

Regular backups

Cryptographic hashing and linking of blocks

Permissioned access

5.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

Which of the following is a key benefit of a distributed peer-to-peer (P2P) network in blockchain?

Faster central processing

Single point of failure

Increased transparency and fault tolerance

More control by one authority

6.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

In a P2P network, each node typically:

Acts as a client only

Acts as a server only

Acts as both client and server

Is dependent on a central authority

7.

MULTIPLE CHOICE QUESTION

45 sec • 2 pts

In blockchain mining, what is a “nonce”?

A random string used to secure a wallet

A fixed key to decrypt transactions

A number miners change to find a valid hash

A block identifier

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