In this issue : Physics Musing Problem Set-20 AIPMT Special - Practice Paper 2015 Thought Provoking Problems - Modern Physics Core Concept - Dopplers Effect You Asked We Answered JEE Foundation Series - Optics and Modern Physics Exm Cafe Brain Map - Oscillations CBSE Board - Practice Paper 2015 JEE Main - Practice Paper 2015 JEE Advanced - Practice Paper 2015 Physics Musing Solution Set-19 25 Must Know Facts - System of Particles and Rotational Motion Crossword