Physics
Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?

Mesosphere
Stratosphere
Ionosphere
Exosphere

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water

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Physics
X-rays region lies between

Short radio waves and long radio waves
Visible and infra-red region
Gamma-rays and ultraviolet region
Ultraviolet and visible region

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