Free CBE Smart Contracts & dApps Questions and Answers — Questions and Answers
Question 1: What is a smart contract in blockchain technology?
- Legal contract with digital signature
- Blockchain explorer
- Decentralized API
- Self-executing program (Correct answer)
Correct answer: Self-executing program
A smart contract is a self-executing program stored directly on a blockchain. It automatically executes predefined actions and terms of an agreement when specific conditions are met, without the need for intermediaries. This ensures transparency, immutability, and trustless execution of agreements.
Question 2: Which blockchain platform is widely known for supporting smart contracts?
- Bitcoin
- Ethereum (Correct answer)
- Ripple
- Dogecoin
Correct answer: Ethereum
Ethereum is renowned for pioneering and widely supporting smart contract functionality. Unlike Bitcoin, which primarily focuses on peer-to-peer digital cash, Ethereum was designed as a platform for building decentralized applications (dApps) and executing complex, self-executing agreements through its smart contracts.
Question 3: Which programming language is primarily used to write Ethereum smart contracts?
- Rust
- Solidity (Correct answer)
- Python
- Go
Correct answer: Solidity
Solidity is the primary high-level, contract-oriented programming language specifically developed for writing smart contracts on the Ethereum blockchain. It is syntactically similar to JavaScript and is the most widely used language for creating decentralized applications (dApps) and their underlying logic within the Ethereum ecosystem.
Question 4: What defines a decentralized application (dApp)?
- Runs on centralized cloud
- Owned by a single company
- Runs on a blockchain and uses smart contracts (Correct answer)
- Only accessible via mobile
Correct answer: Runs on a blockchain and uses smart contracts
A dApp operates on a decentralized network and uses smart contracts to execute its backend logic.
Question 5: What is gas in the context of smart contracts?
- Electricity cost
- Mining reward
- Execution fee (Correct answer)
- Block size
Correct answer: Execution fee
In the context of smart contracts, 'gas' refers to the execution fee required to perform operations on the Ethereum blockchain. It is a unit that measures the computational effort needed to execute transactions or smart contract functions. Users pay gas fees in Ether to compensate miners for the resources consumed in processing and validating these operations.
Question 6: What is a key benefit of dApps over traditional apps?
- Faster download speed
- Requires no internet
- Controlled by a central database
- Censorship resistance (Correct answer)
Correct answer: Censorship resistance
A key benefit of dApps over traditional applications is their censorship resistance. Because dApps operate on decentralized blockchain networks, they are not controlled by a single entity and cannot be easily shut down, altered, or censored by governments or corporations. This ensures continuous availability and user access.
Free CBE Smart Contracts & dApps Questions and Answers
What is a smart contract in blockchain technology?