World Geography
Ultrasound which is upper limit of human hearing is characterized by which of the following frequencies?

Below 20 KHz
Above 200 KHz
Above 2 KHz
Above 20 KHz

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World Geography
Which among the following statements is/are correct about the stratosphere?The Stratosphere is the layer of the Earth’s atmosphere which lies beyond the mesosphere.It extends up to an altitude of 50 kilometres from the earth’s surface.This layer is ideal for flying aeroplaneSelect the correct code from the options given below:

Only 1 & 2
Only 2 & 3
1, 2 & 3
Only 1

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