

MCQOPTIONS
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1. |
Which of the following are true regarding ionosphere?I. It is the uppermost layer of atmosphereII. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionizedIII. This layer is responsible for reflecting back the radio wave transmitted from the earth |
A. | and II |
B. | and II |
C. | I and III |
D. | , II and III |
Answer» D. , II and III | |