2004 2003 2002 2001 2000
  (Sub-Topics) Screening (%) Mains(%)
  1. Photoelectric effect 0 6.67
  2. Bohr’s atomic model 10.71
  3. X-rays 0 6.67
  4. Radioactivity 0 6.67
  5. Nuclear energy. 3.57 0
  Total 14.28 20.01