{
  "questions": [
    {
      "id": 1,
      "question": "Which component is responsible for regulating the air-fuel mixture in an engine?",
      "options": ["Alternator", "Lambda sensor", "Brake disc", "Oil filter"],
      "correctAnswer": 1,
      "explanation": "The lambda sensor measures the oxygen content in the exhaust gas and controls fuel injection based on that."
    },
    {
      "id": 2,
      "question": "How long is a vehicle MOT (roadworthiness test) valid in Hungary?",
      "options": ["1 year", "2 years", "4 years", "6 years"],
      "correctAnswer": 1,
      "explanation": "Passenger cars have a 2-year MOT validity, except for newly registered vehicles."
    },
    {
      "id": 3,
      "question": "Which material is NOT part of a hybrid car battery?",
      "options": ["Lithium", "Nickel", "Lead", "Cobalt"],
      "correctAnswer": 2,
      "explanation": "Hybrid and electric car batteries typically contain lithium, nickel, and cobalt. Lead is found in lead-acid batteries."
    }
  ]
}