NEW
Font size
WorksheetsSmart Contracts & Ethereum Network
Total questions: 25
Worksheet time: 8mins
The Ethereum Virtual Machine (EVM) is:
A physical machine in Ethereum data centers
A distributed computing environment that runs smart contracts
A wallet for Ether
A mining hardware unit
What is a Smart Contract?
A legal contract written on paper
A self-executing program with predefined rules stored on a blockchain
A digital signature used for authentication
A document stored in a decentralized database
Which blockchain is most associated with the popularization of smart contracts?
Bitcoin
Ethereum
Ripple
Litecoin
Ether (ETH) in the Ethereum network is primarily used for:
Playing online games
Paying gas fees and executing transactions
Sending emails
Mining Bitcoin
In Ethereum, 'Gas' refers to:
Fuel for mining machines
The cost of executing operations on the blockchain
Data storage fees
Network bandwidth usage
One key feature of a DApp is that it is:
Owned by a single company
Open-source and decentralized
Only accessible via a mobile app
Built only on Ethereum
Gas fees are measured in:
Bitcoins
Gwei
USD
Blocks
A DAO (Decentralized Autonomous Organization) is:
A traditional company registered with the government
A blockchain-based entity governed by smart contracts
A cryptocurrency exchange
A type of stablecoin
A Hard Fork in a blockchain results in:
Temporary network slowdown
A permanent split creating two separate blockchains
A soft upgrade without breaking compatibility
Removal of old blocks
Which of the following best describes a DAO's governance model?
Centralized decision-making by executives
Decisions are made collectively by token holders
Controlled by one programmer
Based on offline voting only
Which event is an example of a major Ethereum hard fork?
Bitcoin Halving
Ethereum Classic split after The DAO hack
Ethereum Gas Reduction Update
Bitcoin Cash creation
Which is true about a Soft Fork?
It breaks compatibility with old software
It is a backward-compatible upgrade
It requires all nodes to upgrade
It creates a new cryptocurrency
ICO stands for:
Initial Coin Offering
Internal Crypto Organization
International Contract Order
Internet Currency Operation
DApps (Decentralized Applications) run on:
A centralized server
A blockchain network
Cloud hosting only
Local machines only
The purpose of an ICO is:
To launch a new cryptocurrency and raise funds
To mine Ether
To update smart contracts
To fork a blockchain
Which of the following is a risk associated with ICOs?
Price volatility
Guaranteed profits
No blockchain involvement
Centralized control only
Smart contracts are written in Ethereum primarily using:
Python
Solidity
JavaScript only
HTML
The Ethereum Virtual Machine executes smart contracts in:
Bytecode
Machine code
Solidity code directly
JSON format
In Ethereum, a 'Demo of Smart Contracts' could involve:
Deploying and interacting with a contract on a test network
Writing contracts on paper
Downloading blockchain data manually
Using only Bitcoin wallet apps
Which Ethereum network is used for testing purposes?
Mainnet only
Sepolia or Goerli
Bitcoin Testnet
RippleNet
When a smart contract is deployed, it:
Is stored on the Ethereum blockchain
Can be deleted anytime
Exists temporarily in RAM
Runs only on a private computer
Once deployed, smart contract code is:
Easily editable
Immutable (cannot be changed)
Controlled by a central authority
Deleted after 1 year
Which gas fee scenario is most likely to succeed?
Setting gas price too low
Setting gas price competitively based on network demand
Using no gas
Using gas from Bitcoin
What happens if a transaction runs out of gas during execution?
It completes partially and charges for completed steps
It reverts all changes but still consumes the gas
It waits until more gas is added
It pauses until the next block
A benefit of smart contracts is:
Requires middlemen for every transaction
Automation and trustless execution
Works only in one country
No connection to blockchain
