2004 2003 2002 2001 2000
  (Sub-Topics) Screening (%) Mains(%)
  1. Photoelectric effect 3.57 3.33
  2. Bohr’s atomic model 3.57
  3. X-rays 0 6.67
  4. Radioactivity 0 0
  5. Nuclear energy. 3.57 0
  Total 10.71 10