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exam/theory.json

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+[
+  {
+    "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"
+    }
+  }
+]