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

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

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World Geography
Which among the following statements is/are correct about Petroleum?Petroleum is an inflammable mixture of oily hydrocarbons.Most of the oil comes from synclines rather than anticlines.Select the correct code from the options given below:

Only 1
Neither 1 & 2
Both 1 & 2
Only 2

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