GATE-2016 (17)
GATE-2016 17. A wenner array with 60m spacing between current electrodes is placed over an in homogeneous ground. If the measured potential difference and current flow in subsurface are 10mV…
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Showing posts from July, 2016
GATE-2016 (27)
GATE-2016 27. A monochromatic elastic wave of frequency 20Hz propagates in a medium with average velocity 3km/s. For zero offset reflection from horizontal reflectors, the thickness of the vert…
GATE-2012 (26)
GATE-2012 Q.26: The average magnetic susceptibility of dolerite is 1400. What is its magnetic permeability in h/m? (Give answer up to 5 decimal places) A) 0.00176 B) 0.00211 …
GATE-2015 (47)
GATE-2015 Q.47: A spherical body with its center located at depth of 1040 m gives a symmetric residual gravity anomaly high with Δg max =5.2 m Gal. If the same anomaly were to …
GATE-2012 (34)
GATE-2012 34. For a three-layered Earth with resistivities ρ1, ρ2, ρ3 and corresponding thickness h1, h2 and h3 respectively, the quantity (h1/ ρ1)+(h2/ ρ2)+(h3/ ρ3) stands A) longitud…
GATE-2015
GATE-2015 Q.46: In a 3-D seismic survey the bin size for the maximum frequency (f max) of 80 Hz at the target having a reflector dip of 15° and interval velocity of 3600 m/s is........ …
PROBLEM-4
PROBLEM Q. The highest frequency range (in Hz) of an inducing electromagnetic wave that can penetrate up to a depth of 178 s in a medium having a resistivity of 10178 ohms. m Solution:…
problem
Problem Q.Given a seismic wavelet w=(6, -4 ,-2) and reflectivity series r=(0, 1, 0) , the seismic trace is..... A) (0, -4, 0, 0, 0) B) (0, -2, -4, 6, 0) C) (0, 6, 0, 0, 0) D) (0, 6, -4,…
CSIR-NET 2015 (June)- (88)
CSIR-NET 2015 88. Consider the two time sequences with the elements a=1, 2, 3, 1, 2 b=1, 3, 5, 7 What are the first two elements of their convolution? A) 5 , 1 …
CSIR-NET 2015(June)-(79)
CSIR-NET 2015 79. If the average density of rocks in the crust is 2750 kg/m^3 and the value of 'g' (acceleration due to gravity) is 10 m/s^2, then what is the value of litho-static str…
CSIR-NET 2015 (June)-113
CSIR-NET 2015 113. The following table shows the values of resistance R measured in a Wenner sounding for different electrode spacing, a at a location covered by clay. a(m) = …
GATE-2006 (84)
GATE-2006 Q. The Young's modulus (E), density of rock(ρ) and Poisson's ratio (σ) are used to determine Shear wave velocity(β) in a rock. 84. Which one of the following expression is…
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- free air correction 3
- skin depth problem 3
- acceleration due to gravity as on earth 2
- aliasing 2
- signal processing 2
- undersampling 2
- A gravity survey is conducted over a highly compact ore deposit (spherical shape). Bouguer anomaly values reduced along a profile are given below 1
- A tsunami occurs 1000km away form the shore in an ocean water depth of 6.25km. The tsunami reaches the shore in about 1
- A zero-offset reflection event at 1.00 s has a normal move out (NMO) of 0.005 s at 200 m offset. What is the stacking velocity? 1
- Age of the Carbon-14 1
- Airy 1
- Earth's normal gravity field at Colombo is 1
- Electromagnetic methods 1
- Fresnel zone thickness calculation 1
- Isostasy problem 1
- The Young's modulus (E) 1
- The time period of the signal s(t)= sin(π/3)t + cos(π/2)t is__________seconds. 1
- The units of Dynamic viscosity 1
- The value of free-air correction( assuming sea level as datum plane) at an elevation of 150m is......mGal 1
- What is the lithostatic pressure at the base of a 35 km column of granitic crust with an average density of 2.75 gm/cc ? 1
- Wyllie – Time average equation 1
- Youngs modulus of a rock specimen of density 2.7 gm/cc is 9.72 megabar. The longitudinal wave velocity (in km/s) in the rock is 1
- a thrust dipping 30 degrees caused a vertical uplift of a rock surface by 100m in 20 1
- buoyancy force 1
- calculate maximum usable frequency if critical frequency and angle of incidence is known 1
- dip slip fault is 200m and the dip amount is 30 degrees the throw of the fault is 1
- displacement meter 1
- dix formula interval velocity 1
- drift correction problem 1
- earth and mars density ratios are given 1
- eotvos correction solution 1
- focal length and camera height and flying height given then what is the scale 1
- focal length and scale and flying height given then what is the camera height 1
- foldage formula in seismic 1
- the depth to the reflector in seismic 1
- the quantity (h1/ρ1)+(h2/ρ2)+(h3+ρ3) stands 1
- units of hydraulic conductivity 1