Teacher-confirmed SYNTHETIC fixture transcription (not pupil handwriting):

DEMO-001 | Q1 | A torch, an opaque card and a white screen.
DEMO-002 | Q1 | Light source, object, screen.
DEMO-003 | Q1 | A torch and [unclear].

The CSV is prepared from these typed fixture answers, not silently corrected OCR. Teacher approvals are simulated.
