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In seismic refraction surveys, the critical distance: (-Gate geology and geophysics 2014)2 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 AnswerWhich one of the following geophysical methods is most suitable for exploration of possible hydrocarbon-bearing sediments underlying the Deccan Traps? (-Gate geology and geophysics 2014)1 AnswerAssertion (a): An efficient marine seismic survey should use an implosive source. Reason (r): The performance of a marine seismic source is rated by high pulse-to-bubble ratio. (-Gate geology and geophysics 2014)1 AnswerAn 80 Hz seismic signal is sampled at a rate of 100 samples/s. What will be its aliased period (in seconds) in the sampled signal? (-Gate geology and geophysics 2014)1 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 AnswerFor earthquakes of magnitudes 6 and 7, the seismic wave amplitudes are A6 and A7 and the radiated energies are E6 and E7 respectively. Which one of the following is true? (-Gate geology and geophysics)1 AnswerIn a seismic section, paraconformity is marked by -gate Geology & Geophysics 2017 1 AnswerAfter migration, an anticline observed on an unmigrated seismic section becomes -gate Geology & Geophysics 20171 AnswerGardner’s formula relates the seismic P-wave velocity (VP) to -gate Geology & Geophysics 20171 AnswerIn seismic exploration the dynamite source is generally considered to be a wavelet of-gate Geology & Geophysics 20171 AnswerAnalysis of data from a 3-component broadband seismological station yields seismic velocities, Vp = 7.0 km/s and Vs = 3.87 km/s for the lower crust. The resulting Poisson’s ratio of the lower crustal rocks (rounded to two decimal places) is -gate Geology & Geophysics 20171 AnswerIn seismic prospecting, migration is the process of moving data elements from: (-Gate geology and geophysics 2014)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 AnswerSelect the copper ore minerals from the following: (P) Chalcopyrite (Q) Pyrite (R) Pyrrhotite (S) Bornite (T) Sphalerite (U) Chalcocite (-Gate geology and geophysics 2014)1 AnswerThe reflection coefficient at the interface between two layers of resistivities 9 Ωm and 1 Ωm respectively is: (-Gate Geology and Geophysics 2014)1 AnswerThe convolution of two finite length sequences xn = [1, 0, -2] and yn = [1, -1] is: (-Gate geology and geophysics 2014)1 AnswerCirques are formed by: (-Gate geology and geophysics 2014)1 AnswerThe Fourier transform and integral of the Dirac delta function respectively are: (-Gate geology and geophysics 2014)1 Answer