20. Which platform is known for decentralized apps (dApps)?
A) Bitcoin
B) Ethereum
C) Litecoin
21. Which blockchain is known for fast transactions and low fees?
A) Ethereum
B) Solana
C) Bitcoin
D) Binance Coin
22. Which consensus mechanism does Ethereum use?
A) Proof of Work
B) Proof of Stake
C) Proof of Authority
D) Delegated Proof of Stake
23. Which of these coins is focused on privacy?
A) Monero
B) Litecoin
C) Bitcoin
24. What is the primary goal of blockchain?
A) Centralized control
B) Secure and transparent transactions
C) High transaction fees
D) Limited supply
25. Which coin is mainly used for NFTs?
A) Bitcoin
B) Ethereum
C) Cardano
26. Which cryptocurrency uses Proof of Work?
A) Ethereum
B) Bitcoin
C) Polkadot
D) Chainlink
27. What does a cryptocurrency miner do?
A) Store coins
B) Validate transactions
C) Trade coins
D) Build smart contracts
28. Which cryptocurrency was originally created for memes?
A) Bitcoin
B) Dogecoin
C) Litecoin
29. Which platform is known for offering decentralized storage?
A) Ethereum
B) Filecoin
C) Bitcoin
30. What does "staking" mean in cryptocurrency?
A) Mining coins
B) Holding coins to validate transactions
C) Trading coins
D) Converting coins to fiat
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