Upload a chapter-wise PYQ paper

{
  "questions": [
    {
      "qNo": 1,
      "subject": "Physics",
      "text": "A quantity f is given by ... Dimension of f is that of:",
      "type": "single",
      "options": [
        { "id": "A", "label": "1", "text": "volume" },
        { "id": "B", "label": "2", "text": "energy" },
        { "id": "C", "label": "3", "text": "power" },
        { "id": "D", "label": "4", "text": "momentum" }
      ],
      "correctOption": "B"
    }
  ]
}

Each question's correctOption is stripped out of the public questions collection automatically and stored only in the hidden answerKeys collection students can never read.