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Assertion (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 AnswerIn seismic exploration the dynamite source is generally considered to be a wavelet of-gate Geology & Geophysics 20171 AnswerAssertion (a): The 18O/16O ratio in natural systems can be used as a thermometer. Reason (r): The fractionation of 18O/16O depends on temperature. -gate Geology & Geophysics 2017 1 AnswerDetermine the correctness or otherwise of the following Assertion [a] and Reason [r]. GATE-Geology and Geophysics-Question-20121 AnswerWhich one of the following marine environments is indicated by the assemblage of benthic foraminifera Quinqueloculina, Lenticulina, Ammonia, Elphidium? (-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 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 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 AnswerWhich one of the following is the youngest marine formation in the Himalaya? (-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 AnswerThe correct chronological order (older to younger) of the following geological units is: (-Gate geology and geophysics)1 AnswerIn seismic refraction surveys, the critical distance: (-Gate geology and geophysics 2014)2 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 AnswerA source vs (t) = V cos100πt=π has an internal impedance of (4+j3)Ω. If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in Ω should be GATE-Instrumentational-Engineering-20131 AnswerThe current in an enhancement mode NMOS transistor biased in saturation mode was measured to be 1 mA at a drain-source voltage of 5 V. -GATE EC 20151 AnswerWhich one of the following functions is used as a source-term to obtain the Green’s function of a boundary value problem? (-Gate geology and geophysics 2014)1 AnswerMarine insurance-University of calicut -2013-Banking & insurance1 Answer