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Geophysics

1. 

Bouguer correction is applied to correct for the gravity anomaly due to mass between station location and

A. Mohorovicic discontinuity B. base of upper crust C. mean sea level D. local datum plane

Answer : D. local datum plane

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2. 

Which one of the following can be best explored using electromagnetic method?

A. Massive sulphide deposit B. Oil-bearing strata C. Coal-bearing strata D. Disseminated sulphide deposit

Answer : A. Massive sulphide deposit

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3. 

The most sensitive instrument for magnetic survey is

A. optically pumped magnetometer B. proton precession magnetometer C. magnetic field balance D. fluxgate magnetometer

Answer : A. optically pumped magnetometer

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4. 

Which physical property of the medium governs the response of Ground Penetrating Radar (GPR)?

A. Electrical conductivity B. Electrical permeability C. Electromagnetic conductivity D. Seismic wave velocity

Answer : B. Electrical permeability

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5. 

Which one of the following mineral constituents exhibits strong absorption in the UV-blue band of the EM spectrum due to charge transfer effect leading to colouration?

A. Si-O B. Al-OH C. Mg-OH D. Fe-O

Answer : D. Fe-O

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6. 

In a remotely sensed data of a planet, the presence of hydrous species can be inferred using _________region of the electromagnetic spectrum?

A. Beta B. Radiowave C. Infrared D. Gamma

Answer : C. Infrared

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