| 1. Ionosphere deflects long wave, medium wave and short wave radio waves and help in radio transmission. |
| 2. Ionosphere is the layer of convection currents |
A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither 1 nor 2
Correct Answer: A
Solution :
Ionosphere is very helpful in radio transmission as it deflects radio waves. Ionosphere is divided into three different layers known as D, E and F layers. The lowest layer is D which reflects long radio waves. Above the 'D' layer is the 'E' layer which deflects medium radio waves and above both D and E is the F layer which deflects short radio waves. Convection currents are not found in ionosphere; rather these currents are active in troposphere.
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