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In electromagnetic (EM) sounding, the depth of investigation ___________ with increasing frequency. (-Gate Geology and Geophysics 2014)1 AnswerA plane electromagnetic (EM) wave travelling vertically downwards with a frequency of 1000 Hz in a homogeneous medium has a skin depth of 100 m. The ratio of the amplitude of the EM wave at a depth of 75 m with respect to the amplitude at the Earth’s surface is ___________.0 AnswerArrange the following electrode configurations in the ascending order of their depth of investigation. (-Gate geology and geophysics 2014)1 AnswerA confined sandy aquifer has a thickness of 10 m and transmissivity of 0.75 m2 per day. Its hydraulic conductivity is _____ m/day. (-Gate geology and geophysics 2014)1 AnswerMetal content (in metric tonnes) of an ore having specific gravity and assay values of 2.86 and 1.49 % respectively in a mining block 40 m long, 30 m wide and with an average thickness of 2.13 m is _______. (-Gate geology and geophysics 2014)1 AnswerT he apparent resistivities obtained at 0.1 Hz and 10 Hz in the frequency domain I.P. measurement are 100 m and 80 m, respectively. The Percentage Frequency Effect is _________.0 AnswerThe correct sequence of metamorphic facies with increasing depth in a subduction zone is GATE-Geology and Geophysics-Question-20121 AnswerThe S-wave velocity of a medium having a Poisson’s ratio and a P-wave velocity of 0.5 and 3 km/s respectively is _______km/s. (-Gate geology and geophysics 2014)1 AnswerWhich one of the following transforms relates the real and imaginary components of harmonic electromagnetic (EM) field? (-Gate geology and geophysics 2014)1 AnswerCompute the coefficient of anisotropy from the following parameters estimated from a Vertical Electric Sounding (VES) survey. (-Gate geology and geophysics 2014)1 Answer In frequency domain IP, which one of the following frequency ranges (in Hz) is used to measure apparent resistivity at DC and AC limits? -gate Geology & Geophysics 20172 AnswerIdentify the CORRECT sequence of the electromagnetic waves in their increasing frequency -gate Geology & Geophysics 2017 1 AnswerWhich one of the following can be best explored using electromagnetic method? GATE-Geology and Geophysics-Question-20121 AnswerA student interpreted a four layer Schlumberger resistivity sounding data and obtained the resistivities () and thicknesses (h) as follows: 1=100 m, 2=20 m, 3=1500 m and 4=50 m; h1=50 m, h2=10 m and h3=20 m. The same data is interpreted by another student who obtains 3=2000 m. Then, according to the principle of equivalence, the value of h3 interpreted by the second student is ________m. (All other model parameters estimated by both the students are the same.)0 AnswerThe data of which one of the following active electromagnetic techniques can be used to correct static shift effect in magnetotelluric apparent resistivity data? -gate Geology & Geophysics 2017 1 AnswerDepth range of the ‘transition zone’ associated with phase changes in the Earth’s mantle is (in km) GATE-Geology and Geophysics-Question-20121 AnswerMild steel is carburized at 1300 K for 1 hour to obtain a certain case depth. Keeping the time as 1 hour, the case depth can be doubled by increasing the temperature to ______________K (round off to the nearest whole number)0 AnswerThe Bouguer anomaly obtained after applying all necessary corrections is due to -gate Geology & Geophysics 20173 Answer The frequency range (in Hz) that defines dead-band in magnetotelluric source signal is -gate Geology & Geophysics 2017 1 AnswerChoose the most appropriate word from the options given below to complete the following sentence. - Gate Geology and Geophysics 2014 (General Aptitude section)1 Answer
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