Central Board of Secondary Education
Class – XII (Year 2009)
Subject – Physics - (Outside)
General Instructions:
(i) All questions are compulsory.
(ii) Marks for each question are indicated against it.
(iii) Use of Calculators is not permitted.
- Name the EM waves used for studying crystal structure of solids. What is its frequency range ?
- Two thin lenses of power +6D and -2D are in contact. What is the focal length of the combination ?
- Give the logic symbol of NOR gate.