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exam/theory.json

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+[
+  {
+    "id": 1,
+    "question": "What best describes a distributed system?",
+    "options": {
+      "A": "A system running on a single powerful computer",
+      "B": "A collection of independent computers appearing as a single coherent system",
+      "C": "A database replicated in multiple files",
+      "D": "A centralized system with backup servers"
+    }
+  },
+  {
+    "id": 2,
+    "question": "In distributed systems, asynchronous communication primarily enables:",
+    "options": {
+      "A": "Tight coupling",
+      "B": "Immediate request-response",
+      "C": "Direct memory access",
+      "D": "Loose coupling"
+    }
+  },
+  {
+    "id": 3,
+    "question": "A standard message queue is ideal for:",
+    "options": {
+      "A": "Broadcasting events to all services",
+      "B": "Encrypting REST calls",
+      "C": "Storing smart contracts",
+      "D": "Work distribution (e.g., resizing images)"
+    }
+  },
+  {
+    "id": 4,
+    "question": "In distributed systems, retries are generally considered:",
+    "options": {
+      "A": "Immediate",
+      "B": "Impossible",
+      "C": "Inevitable",
+      "D": "Unnecessary"
+    }
+  },
+  {
+    "id": 5,
+    "question": "A cryptocurrency wallet (running on our phone or computer) primarily stores:",
+    "options": {
+      "A": "Coins owned by the user",
+      "B": "Blocks from the blockchain",
+      "C": "Gas to sign transactions",
+      "D": "Private (and public) keys"
+    }
+  },
+  {
+    "id": 6,
+    "question": "The Bitcoin Lightning Network is designed to:",
+    "options": {
+      "A": "Replace Ethereum smart contracts",
+      "B": "Equalize PoW energy consumption",
+      "C": "Enable faster off-chain Bitcoin transactions",
+      "D": "Change Bitcoin's supply cap"
+    }
+  },
+  {
+    "id": 7,
+    "question": "RPC can cause problems if developers forget that:",
+    "options": {
+      "A": "It uses HTTP for communication",
+      "B": "It requires JSON encoding",
+      "C": "It needs a message broker to work",
+      "D": "It is still a network call and can fail"
+    }
+  },
+  {
+    "id": 8,
+    "question": "In Solidity, a mapping is most similar to:",
+    "options": {
+      "A": "An array with elements",
+      "B": "A dictionary (key-value store)",
+      "C": "A loop with fixed iterations",
+      "D": "A function implementing a feature"
+    }
+  },
+  {
+    "id": 9,
+    "question": "What is React?",
+    "options": {
+      "A": "A database management system",
+      "B": "A free and open-source front-end JavaScript library",
+      "C": "A backend framework for Node.js",
+      "D": "A CSS styling library"
+    }
+  },
+  {
+    "id": 10,
+    "question": "What is used to pass data from a parent component to a child component in React?",
+    "options": {
+      "A": "Props",
+      "B": "State",
+      "C": "Events",
+      "D": "Hooks"
+    }
+  },
+  {
+    "id": 11,
+    "question": "What is the main purpose of the Virtual DOM in React?",
+    "options": {
+      "A": "To store sensitive application data",
+      "B": "To create a CRUD design for objects",
+      "C": "To efficiently update the browser DOM by comparing changes",
+      "D": "To replace JavaScript in modern browsers"
+    }
+  },
+  {
+    "id": 12,
+    "question": "Why does React require a key attribute when rendering lists?",
+    "options": {
+      "A": "To uniquely identify items for efficient updates",
+      "B": "To apply CSS styling for each element",
+      "C": "To be able to present escaped HTML data",
+      "D": "To enable linking to the list items"
+    }
+  }
+]