00511nam a22001817a 4500 87387 87387 NITIL 20220601105433.0 220601b ii ||||| |||| 00| 0 eng d 9788174509765 Rs.140 NITIL NITIL 23rd ed. 500 N277S national council of educational research and training 5378 Science Exemplar Problems New Delhi NCERT 2009 vi,182p.;23cm Physics,Earth sciences ddc BKS