Atmosphere Multiple Choice Questions Set 1/UPSC,PCS,CDS,NDA & SSC Examinations. MCQs

Q1. Which of the following are true regarding the ionosphere? I. It is the uppermost layer of the atmosphere, II. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionized, III. This layer is responsible for reflecting back the radio wave transmitted from the earth