[
  {
    "id": 1,
    "question": "What is horizontal scaling?",
    "options": {
      "A": "Adding more CPU and RAM to a single machine",
      "B": "Replacing hardware with faster SSDs",
      "C": "Adding more machines to improve performance",
      "D": "Upgrading the operating system"
    }
  },
  {
    "id": 2,
    "question": "Which statement about distributed vs decentralized systems is correct?",
    "options": {
      "A": "Every distributed system is decentralized",
      "B": "A decentralized system must be distributed",
      "C": "A distributed system must have no central authority",
      "D": "They are identical concepts"
    }
  },
  {
    "id": 3,
    "question": "In a CP (Consistency + Partition tolerance) system, what happens during a network partition?",
    "options": {
      "A": "The system sacrifices Consistency to stay online",
      "B": "The system ignores the partition and continues normally",
      "C": "The system shuts down entirely",
      "D": "The system sacrifices Availability to ensure data accuracy"
    }
  },
  {
    "id": 4,
    "question": "If gas runs out during the execution of a transaction:",
    "options": {
      "A": "Execution stops and state changes from the current call revert",
      "B": "Only part of the smart contract storage updates",
      "C": "Changes to state are partially applied",
      "D": "Transaction becomes free"
    }
  },
  {
    "id": 5,
    "question": "A mnemonic (seed phrase) allows a user to:",
    "options": {
      "A": "Mine faster",
      "B": "Recover private keys",
      "C": "Increase gas fees",
      "D": "Modify blockchain rules"
    }
  },
  {
    "id": 6,
    "question": "What is the role of the constructor() in a Solidity contract?",
    "options": {
      "A": "It is called every time a function is executed",
      "B": "It is used to delete the contract from the blockchain",
      "C": "Its code is run only once when the contract is created",
      "D": "It is used to calculate the gas price of the contract"
    }
  },
  {
    "id": 7,
    "question": "If someone has your private key, they:",
    "options": {
      "A": "Can view your transactions only",
      "B": "Cannot do anything without your password",
      "C": "Have total control over your funds",
      "D": "Cannot do anything without the mnemonics"
    }
  },
  {
    "id": 8,
    "question": "How does Raft differ from basic Paxos in its approach to reaching consensus?",
    "options": {
      "A": "Raft was designed to work via a single elected leader",
      "B": "Raft is used for strong consistency, while Paxos is for eventual consistency",
      "C": "Raft does not require a majority of nodes to agree",
      "D": "Raft is mathematically impossible to implement"
    }
  },
  {
    "id": 9,
    "question": "What is the main difference between props and state in React?",
    "options": {
      "A": "Props are internal to a component; state is passed from parents",
      "B": "Props are handled by the browser; state is handled by the server",
      "C": "Props are passed from above; state is managed within the component",
      "D": "Props are only for strings; state is only for numbers"
    }
  },
  {
    "id": 10,
    "question": "Why should you use className instead of class in JSX?",
    "options": {
      "A": "class is a reserved word in JavaScript",
      "B": "className is faster to process",
      "C": "className allows for more CSS features",
      "D": "class only works with class-based components"
    }
  },
  {
    "id": 11,
    "question": "Which of the following is a rule of React hooks?",
    "options": {
      "A": "Hooks must be called inside loops",
      "B": "Hooks should only be called at the top level of a component",
      "C": "Hooks can be used inside regular JavaScript functions",
      "D": "Hooks must always be defined inside a try-catch block"
    }
  },
  {
    "id": 12,
    "question": "What is sharding in distributed databases?",
    "options": {
      "A": "Data encryption",
      "B": "Backup process",
      "C": "Data duplication",
      "D": "Splitting data across machines"
    }
  }
]