Questions:

1. **What is cryptocurrency?**
   a) Decentralized digital currency  
   b) Fiat money issued by the government  
   c) Tool for payments in traditional banks  
   d) Centrally controlled electronic currency  

2. **What is blockchain?**
   a) A technology for storing data in a centralized database  
   b) A decentralized system representing a chain of data blocks  
   c) Software for managing cryptocurrencies  
   d) An application for tracking transactions  

3. **Which of these cryptocurrencies is the first and most well-known?**
   a) Ethereum  
   b) Litecoin  
   c) Bitcoin  
   d) Ripple  

4. **What is mining?**
   a) The process of creating new blocks and adding them to the blockchain  
   b) The process of exchanging cryptocurrency for fiat money  
   c) The process of sending and receiving cryptocurrency  
   d) The process of creating new cryptocurrencies