Central Board of Secondary Education
Class – XII (Year 2011)
Subject – Physics - SET- 2
(i) All questions are compulsory.
(ii) Marks for each question are indicated against it.
(iii) Use of Calculators is not permitted.
- Define the term 'wattless current'.
- When monochromatic light travels from one medium to another its
wavelength changes but frequency remains the same. Explain.