250+ Blockchain Questions - Set 4 [With Solutions]

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Blockchain Questions Set 4:

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Blockchain Questions

Set 4/14

Which was the world's first Bitcoin ATM?

Robocoin

Robomate

Roboplus

Doroplus

What is the base unit for time in Solidity?

Minutes

Seconds

Days

Milliseconds

What does a smart contract represent?

Integration API

Proof of work

Business logic layer

Transaction layer

What is a Directed Acyclic Graph (DAG) in the context of IPFS?

Directory of Addressed Graph

Daemon Address Generation

None of the above

Directed Acyclic Graph of all the files/objects in the IPFS

How do you access the web interface to the IPFS?

By downloading the additional webui pack from the ipfs website

Through the command line by typing ipfs webui

Through a browser using https://gateway.ipfs.io/ipfs/

Through a browser using localhost://5001/webui

What is Remix?

Remix is a Python IDE used to write programs for Bitcoin Blockchain

Remix is an IDE used to write smart contracts in Solidity

Remix is an Open source software used to reward Miners in Bitcoin Network

Remix is a private Blockchain based on Ethereum Network

Even though we can specify only tens of seconds (40-70) as the stage time, the actual stage time or duration in real-life blockchain applications could be longer. Which of the following options are correct?

The stage time in real life blockchain applications is shorter than 10 seconds

Both Option 1 and Option 2 are correct

None of the above

The stage time in real life blockchain applications is longer than 10 seconds

What is a Replay Attack?

It is a form of string exploit attack where a buffer is used

It is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed

It is a form of Denial of Service attack where the hacker gains access to the system

It is a form of phishing attack where the hacker gains access to the victim's computer through the use of links which contain malware

In blockchain terminology, what is a blockchain address?

Addresses are identifiers of 26-35 alphanumeric characters used to creating blocks

Addresses are identifiers of 26-35 alphanumeric characters used to send and receive transactions

Addresses are identifiers of 36-47 alphanumeric characters used to send and receive transactions

Addresses are identifiers of 14-25 alphanumeric characters used to send and receive transactions

Which of these is an accurate description of what Bitcoin mining is?

Mining is all about miners solving a complex mathematical equation which takes a long time to compute

Mining is all about finding a Nonce value which will generate a Hash value below a certain target threshold set by the Bitcoin network

Mining is all about miners using as much electricity as they can - whoever shows they've used the most electricity wins

Mining is all about waiting. The bitcoin network generates a new block every 10 minutes - the first miner to see it wins

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Qn. Sets

Blockchain Questions Set 4:

Blockchain Questions

Which was the world's first Bitcoin ATM?

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Reveal Answer

What is the base unit for time in Solidity?

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Reveal Answer

What does a smart contract represent?

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Reveal Answer

What is a Directed Acyclic Graph (DAG) in the context of IPFS?

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Reveal Answer

How do you access the web interface to the IPFS?

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Reveal Answer

What is Remix?

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Reveal Answer

Even though we can specify only tens of seconds (40-70) as the stage time, the actual stage time or duration in real-life blockchain applications could be longer. Which of the following options are correct?

Reveal Answer

Reveal Answer

What is a Replay Attack?

Reveal Answer

Reveal Answer

In blockchain terminology, what is a blockchain address?

Reveal Answer

Reveal Answer

Which of these is an accurate description of what Bitcoin mining is?

Reveal Answer

Reveal Answer

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