Rajasthan Public Service Commission 2016
Paper 74JuniorGeophysicist
Ques
What is difference between the gravity value (in mGals at equator and pole of the Earth
5200
6200
7200
8200
...... .... .. ...... .. .... .. ........... ... .. ... .... (.........., mGals ...) ... ..
5200
6200
7200
8200
Ques
What is the formula to apply Bouguer correction to gravity data density; Gravitational constant; h station elevation .




........... .... ... ....(Bouguer) ..... .... .... .. .... .... ... .. ...; ........... ........ h ...... ..... .





Ques
What would be the free air correction for the gravity measured at an elevation of 152.7 meters? (Assume sea level as datum).
27.12 mGals
47.12 mGals
67.12 mGals
77.12 mGals
152.7 .... ... ..... .. .... .... .. ........... ... .. .... .. ... ..... ... .... (... ...... .... ..)
27.12 ..........
47.12 ..........
67.12 ..........
77.12 ..........
Ques
Name the gravity correction that is always positive
Bouguer correction
Free Air Correction
Terrain Correction
Latitude correction
... .. ........... ..... ..... ..... .... ..
....(Bouguer) .....

.. ... .....
.....(Terrain) .....
..... .....
Ques
Bode's law expresses the approximate distance between
Earth and other planets
Sun and other planets
Moon and the Earth
Moon and the Sun
.... .. ..... ... .. ... ... ......... ..... ... .... ..
...... .. .... .... .. ... ...
..... .. .... .... .. ... ...
...... .. ...... .. ... ...
...... .. ..... .. ... ...
Ques
The maximum gravity value due to a sphere reduces to half at a horizontal distance of 380 meters from the centre of sphere at x 0. What is the
approximate depth to the centre of sphere?
496 meters
596 meters
696 meters
796 meters
.. .... .. ....... ........... ..., .... .. 380 .... ... ..... .. ... .. .... .. .... .. .... .. ......... ..... ... ..
496 ....
596 ....

696 ....
796 ....
Ques
What is the angle of inclination at the magnetic dip poles?




........ ...... (........ ... ....) .. ......... .. ... ..... .... ..




Ques
Ground resolution of a satellite is a function of
Velocity of Satellite
Mass of Satellite
Orbit of Satellite
Height of Satellite
.... .. ..... ..... .........) ....... .... ..
.... ... .... ..
.... .. ..... ..

.... ... ...... ..
.... ... ..... ..
Ques
Within peneplained gneissic area, the graphite mica schist is host for sphalerite mineralization that is associated with pyrite and pyrrhotite
15%. The diagnostic geophysical method will be
Self potential method
Induced Polarization method
Magnetic method
Gravity method
..... .......... .... ... .......... ..... ...... ..... ... . ... .... .. ... ... ....... .. 15% ........ .. .. ... ........... .....
.. .... .. .... ..
.... ....... ...
........ ........... ...
......... ...
........... ...
Ques :10
According to the dipolar theory of Earth's magnetic field a dipole is assumed at the center of the Earth making an angle with the axis of rotation of
the Earth . What is this angle





...... .. ......... .... .. ....... (dipolar) ...... .. ...... ...... .. .... .. .. .......... ...... .. ...... ... ..... .. ... .. ... ..... ..
.. ... ..... ..




Ques :11
Which of the following is true about the Airy's model of Isostasy? The base of the Earth's crust is not the mirror image of the topography .
Areas of high elevation have high density 'crustal root'. Crustal blocks of the Earth have equal density and they float on high density material
Crustal blocks of the Earht have different density.
Only
and
only
only
...... ... .. ... .. ... .... .. .......... .... (Airy's model of Isostasy) .. .... .. . . .. ...... .. ...... .. .... .... .. .....
... ..... .. .. ..... .. ...... ... .. ... ..... "..... (......) .." .. ...... .. ..... (......) ....... .. ..... ... .. .. ..
.. ... ..... ...... .. ..... .. ...... .. ..... (......) ....... .. ......
... ..
....
..
....
....
Ques :12
Which of the following represents the ray path for the pwave
refracted from the Earth's mantle, pass through the outer core, inner core and back

out
PKP
PKIKP
PPP
PKKP
...... ... .. ... .. P ....
.. .. .... .. ...... .. .. ...... .. .... (mantle) .. ......... ...., ...... ..., ...... ... .. ...... ...
.... .... ... ..
PKP
PKIKP
PPP
PKKP
Ques :13
How many earthquakes of magnitude 6 are required approximately to produce the same amount of energy (in Joules) as produced by an
earthquake of magnitude 8
150
350
450
750
..... 8 .. ..... .. ...... ...... ..... (... ...) .. ..... ..... ..... .... .. .... ..... 6 .. ..... ..... (....) ...... ..
150
350
450
750
Ques :14
What is the name of the empirical formula that gives the frequency of the aftershocks at time after the main shock?
Omori's Law
Richter's Law
Gutenberg's Law

Kanamori's Law
...... .. .... .. ........ .. ... ... .. .. .... ..... .. ... ... .. ..... ... ..... ..... ..
....... ..
.... ..
........ ..
........ ..
Ques :15
What is the ratio of Pwave
velocity to the Swave
velocity for a rock with Poisson's ratio of 0.25
1.93
1.83
1.73
1.63
0.25 .. ...... ...... ..... . .. .. .... ....
.. .. ....
... .... .. ...... ... ..
1.93
1.83
1.73
1.63
Ques :16
Which of the following remains constant for a ray travelling downward through a series of layers with increasing velocity
Amplitude
Ray Parameter
Energy
Frequency
.. .... ...... .... ... .... .. ... ..... ... .. ...... .. ...... .. .... .... ... ... ..... .... ..


.... (Amplitude)
.. ........ (Ray Parameter)
..... (Energy)
..... (Frequency)
Ques :17
What is the velocity of Swaves
in a medium (µ:shear modulus; density)




.. ...... ... .. ....
.. ... .... ... .. ...... ......; . ...)





Ques :18
Which of the following is false for the propagation of Pwaves
and Swaves
in a medium Swaves
travel faster than the Pwaves
Swaves
travel slower than the Pwaves
Swaves
cannot travel through the fluid medium. Pwaves
can travel through the fluid medium.
only
and
only
only
.. ...... .. ...... ... .. ....
.. .. .. ....
.. .. .... ..... .. ... ... .. .. ....
.. ... ..... ... .. ....
.. .....
... .... .. .. ....
.. ... ..... ... .. ....
.. .... .... .. .. ....
.. .. ...... ... ..... .. .... .. ....
..
.. ...... ... .. .... ..
....
..
....
....
Ques :19
According to frequencymagnitude
relation, how many earthquakes of magnitude 4 per year are expected in a region that has experienced one
earthquake of magnitude 6 per year (Take bvalue
.
10
100
200
300
......
.... .. ..... .. ......, .. .... ... ..... .... ..... 4 .. ..... ..... ... ... ....... .. .... ..... 6 .. ..... .... .. .....
..... .... ... .. b ..
... 1
10
100
200
300

Ques :20









Ques :21
286 cm
386 cm
186 cm
486 cm
286 ..........
386 ..........
186 ..........
486 ..........

Ques :22
How many seismic zones have been presented in the seismic zoning map of India?
One
Two
Three
Four
.... .. ....... ........ ..... ... ..... ....... ... ..... .. ..
..
..
...
...
Ques :23
One MPa of stress drop is equal to
1 bar
5 bars
10 bars
100 bars
.. .... ...... ...... .. ..... ..
1 ...
5 .....
10 .....
100 .....
Ques :24

5000 meters/sec
4000 meters/sec
3000 meters/sec
2000 meters/sec
5000 .... ..... .....
4000 .... ..... .....
3000 .... ..... .....
2000 .... ..... .....
Ques :25
The velocities of direct wave and crirically refracted wave have been estimated as 415 meters/sec and 2055 meters per sec respectively. What is the
critical distance if the cross over distance is 12.8 meters
4.15 meters
3.15 meters
2.15 meters
1.15 meters
.... .... .. ......... ......... .... ... .... ..... 415 .... ..... ..... .. 2055 .... ..... ..... ......... .. ... ....... ..... 12.8
.... .. .. ....... ..... ... ....
4.15 ....
3.15 ....
2.15 ....

1.15 ....
Ques :26
What is the shape of time distance
curve in case of seismic reflection?
Straight line
Parabola
Elliptical
Hyperbola
....... (.... .
....) ......... ... ......
.. .. ... .. .. ... ..
.... ....
........
....... (Elliptical)
.........
Ques :27
A layer with a velocity 1500 meter/sec and a thickness of 100 meters lies above another layer with a velocity 3000 meter/ sec. What is expected
cross over distance?
100v3
200v3
300v3
50v3
.. ... ...... .... 1500 ..../ ..... .. ..... 100 .... ... .. .. .. ... .. ... ..... .. ...... .... 3000 ..../..... .. ....... .....
..... ....... ..
100v3
200v3
300v3
50v3

Ques :28
The emissivity spectral signature is generally useful for identifying
Ores and rock types
Oil structure
Water bearing formations
Cloud Pattern
........... (emissivity) ........ ........ .. .. ... .. ...... ..... ... .. .... ..
....... .. ... .....
... ......
.... ..... .......
...... .. ..... . ......
Ques :29
Two layers with velocities 1500 meters/sec (top layer) and 2500 meters/sec (bottom layer) are separated by a horizontal reflector. The depth of the
reflector is 750 meters. What would be the two way reflection time at zero offset?
2 sec
3 sec
1 sec
4 sec
.. .... ...... .... 1500 ..../..... (... ... ...) .. 2500 ..../..... (.... ... ...) ... .. .. ...... ........ .. ... .... .. ........ ...
..... 750 .... .. ... .... .. ... .... .. ......... ... ... ..
2 sec
3 sec
1 sec
4 sec
Ques :30

The normal moveout
time of seismic reflection is directly proportional to which of the following
Offset distance
Square of the offset distance
Velocity
Square of the velocity
....... (.... .
....) ......... .. ...... ......
... ........... ... .. ..... ... ........... (directly proportional ..
...... .....
...... ..... .. ....
....
.... .. ....
Ques :31
The IP effect is observed over multimetal
sulphide body because
The body is partly above and partly below the water table
The resistivity of the body is very low
Due to presence of more than one metallic mineral
The path of inducing current changes from ionic to electronic and electronic to ionic
... .... ...... ..... .. .. .. ..... .... .... .. ......
..... ...... .. .. .... .. ... .. ...... .. .. .... .. .... ..
..... ... ........... .... .. ..
.. .. ... .... ..... ... ......... .. ....
....... ..... ... .... ......... .. ...... . ...... .. ......... .. ....
Ques :32
What is the width of the seismic pulse with frequency 30 Hz and seismic velocity of 3000 meter/sec?
100 meters
900 meters

300 meters
400 meters
.. .... .
.... ... ... ........
.. ... .. ...... ..... 30 .... .. .... 3000 ..../..... ..
100 ....
900 ....
300 ....
400 ....
Ques :33
0.248
+0.148
+0.248
0.148
0.248
+0.148
+0.248
0.148

Ques :34
Which of the following is required for a seismic wave to reflect from a subsurface boundry
Velocity contrast
Density contrast
Accoustic impedance contrast
Temperature constrast
.. .... .
.... .... .. .. ..... .... .. ........... .... .. .... ...... ... .. ... ...... ..
.... ... ........
... ... ........
........ ......... ... ........
...... ... ........
Ques :35









Ques :36

12 meters
16 meters
20 meters
24 meters
12 ....
16 ....
20 ....
24 ....
Ques :37

A low velocity layer with velocity V2 is sandwiched between layers with velocity at the top and with velocity at teh bottom.
What are the velocities estimated from the timedistance
plot of seismic refraction for this model?
V1 and V2
V2 and V3
V1 and V3
V1 only
.. .... .... ..... ... ...... .... V2 .. .. ..... .. ... ... ....... (sandwiched) .. ... ..... ... ... .... V1 V2) .. .... ..... ... ...
.... V3 V2) .. .. .... .. .... ........ ....... .. ......
.. ... .. ... .. ....... ......... ... .. .... ..
V1 .. V2
V2 .. V3
V1 .. V3
.... V1
Ques :38
What is the resistivity of copper with resistance length L and cross sectional area
RL A
RA L
L AR
A RL
.. ..... ... ........... ... .. ..... ........ ...... L .. .... ...... (crosssectional)
.... A ..
RL A
RA L
L AR
A RL
Ques :39
The Wenner configuration with electrode spacing measures the potential difference .V for a current of 1 Ampere during a resistivity
survey.What is the apparent resistivity for this case





.. ........... ...... .. ..... .... (wenner) ...... (........ ... ... ... ..... .. ..... .... ... 1 ....... ....... . .... .. ....
....... . .... .. .... potential difference) .V .. .. .. .... ..... ........... ... ..




Ques :40
Name the discontinuity that lies within the continental crust of the Earth .
Moho discontinuity
Gutenberg discontinuity
Lehmann discontinuity
Conrad discontinuity
...... ... .......... ... (crust) .. .... ... ..... .......... (discontinuity) .. ... ... ..
.... ..........
......... ..........
...... ..........
...... ..........

Ques :41
In SP method the electrodes used are
Stainless steel electrodes
Copper electrodes
PVC electrodes
Nonpolarizable
electrodes
....... (.... ......., SP) ..... ... ........ ..... .... .... ..
........ ...... ......
.... ......
...... ......
... ........ (Nonpolarizable)
......
Ques :42
180
0.20
5
20
180
0.20
5

20
Ques :43








Ques :44
Kalpana I
satellite is basically
INSAT
IRS
GSLV
METSAT
..... I
.... ... .. .. ..

INSAT
IRS
GSLV
METSAT
Ques :45
Impermeable surface may be identified and assessed in
Panchromatic photography
Ultra violet images
Microwave images
Infrared
images
...... (Impermeable) ... ... ..... .. ........ .... .. .... ..
........... (Panchromatic .........
... ...... ......
......... ......
.. ....
......
Ques :46
What is the spacing (in general) between the source electrode A and the potential electrode M mounted on the sonde for long normal log
16 inches
32 inches
64 inches
44 inches
..... ..... (long normal) ... .. ...... (Sonde) .. ... ... ...... ........ A .. ....... . .... (potential) ........ M .. ... .. ......
(.. ... ..) ... ..
16 ...
32 ...

64 ...
44 ...
Ques :47
Which logging is used for operation in wells filled with nonconducting
fluids?
Normal logging
Induction logging
Lateral logging
Laterolog
..... (nonconducting)
.. .. ... ... ...... ... ..... .. .... ... ....... .. ..... .... .... ..
....... .....
...... .....
..... .....
......
Ques :48
For which logging the coils rather than electrodes are used?
SP logging
Normal logging
Lateral logging
Induction logging
... ....... ... ........ .. .... ........ (....,coil) ........ .... ..
.. .. .....
....... .....
..... .....
...... .....

Ques :49
Which log gives the best estimation of resistivity of the mudcake lining a well and resistivity of the invaded zone?
Normal log
Lateral log
Laterolog
Microlog
...... ... ..... .. ... ... ... ..... .. ....... (invaded) .... ... ........... .. ... . ...... ... .. ... .... ..
....... ...
..... ...
......
.........
Ques :50
Which log gives the best detection of the porosity variations within the sandstone formation
Gamma log
Normal log
NeutronGamma
log
SP log
.....
... .... ... ....... .. .... .......... .... ... ....... . ..... .... ..
.... ...
....... ...
..........
...
.. .. ...
Ques :51

The electric potential at a distance from the electrode is proportional to
1/r

r

.. ........ .. ..... .. ....... . .... (.......) ..... ......... ..
1/r

r

Ques :52
Which geophysical survey can map the boundaries of the saline ground water
Gravity survey
Magnetic survey
Reflection survey
Electrical survey
... .. ........... ...... .... .... ... ...... .. .... ... .... ..
....... ......
........ ......
........ ......
....... ......
Ques :53

Which is the frequency domain Induced Polarization measurement
Chargeabillity
IP ratio
Metal factor
Polarizability
..... ..... ... ........ ........... .. ... ... ..
.............
.. .. ......
.... .....
................
Ques :54









Ques :55









Ques :56
0.8
1.6
1.2
0.2
0.8

1.6
1.2
0.2
Ques :57









Ques :58
2.25
4.45
1.25
0.25
2.25
4.45
1.25
0.25
Ques :59




iv)




ii)





iv)




iv)




iv)




ii)




iv)




iv)
Ques :60









Ques :61
A continuous time signal of duration 100 miliseconds has a miximum frequency of 250 Hz. How many samples are required for the complete
representation of the signal
20
30
40
60
100 ........... ..... .. .. ..... ...... ... ....... ..... 250 .... .. ..... ....... ...... .. .... ....... .. .... ...... ..
20
30
40
60

Ques :62








Ques :63
What is Fourier transform of a rectangular pulse?
Exponential pulse
Sinc pulse
Rectangular pulse
Triangular pulse

.. ....... ... .. ..... (Fourier) .......... ... ..
............. (Exponential) ...
..... (Sinc) ...
....... ...
...... ...
Ques :64
What is ztransform
of the sequence

1
2
0
1
.. ...
.. z
.......... ... ..
1
2
0
1
Ques :65
The ztransforms
of input and output of a system are given by and respectively What is the transfer function of the system




.. .... (system) .. ..... .. ...... .. z
.......... ..... .. .. .... .. ....... ..... ... ..





Ques :66
The poles of a system are and z=2 . What is stability of the system?
Unstable
Stable
Oscillatory
Stable and Unstable
.. .... (system) .. .... z 1/2 .. z 2 .. .... ... ....... ... ..
......
.....
......... (Oscillatory
..... .. ......
Ques :67
When a system is said to be anti causal?
The output of the system depends on present input.
The output of the system depends on past input .
The output of the system depends on past output .
The output of the system depends on future input.
.. .... (system) .. ..... .....
(anticausal)
.. .... ..
.. .. .. ...... ....... ..... .. ....... .... ..
.. .. .. ...... ..... ..... .. ....... .... ..
.. .. .. ...... ..... ...... .. ....... .... ..


.. .. .. ...... ... . ..... .. ....... .... ..
Ques :68
What is the type of the system represented by input; output; n time]
Linear
Nonlinear
Either linear or nonlinear
Neither linear nor nonlinear
.. .... .. .. ....... ... .. ... ..... .. .. .....; ...
........
... ........
.. .. ........ .. ... ........
.. .. ........ . ... ... ........
Ques :69









Ques :70

x

n1)




x

n1)




Ques :71
7.5
5.8
7.8
6.8
7.5
5.8
7.8
6.8
Ques :72
Name the discontinuity where velocity of pwaves
decreases sharply
Moho discontinuity
Gutenberg discontinuity
Lehmann discontinuity
Conrad discontinuity
.. .......... (discontinuity) .. ... ..... .... .. .....
.... .. .. .. .... ..
.... ..........
......... ..........
...... ..........


...... ..........
Ques :73
Which derivative of the gravitational field is used for the separation of the residual and regional gravity anomalies
First derivative
Second derivative
Third derivative
Fourth derivative
........... ..... .. ... .... (derivative) .. ......... .. ...... ....... ....... (anomaly) .. ... .... .. .... ...... .... ....
..
.... ......
..... ......
..... ......
.... ......
Ques :74
What is the name of the 'principle of least time'
Huygen's principle
Rayleigh principle
Snell's principle
Fermat's principle
.. .. ... .. ......' .. ... ... ..
..... .. ......
..... .. ......
..... .. ......
.... .. ......

Ques :75









Ques :76
What is Dix equation in seismic method
It relates average velocity with RMS velocity.
It relates average velocity with interval velocity.
It relates interval velocity with RMS velocity.
It relates stacking velocity with RMS velocity.
........ ..... ... ..... ...... ... ..
.. ... .... .. ...... .... .. ....... ..
.. ... .... .. ...... .... .. ....... ..
.. ...... .... .. ...... .... .. ....... ..
.. ........ (stacking) .... .. ...... .... .. ....... ..
Ques :77









Ques :78
What is the magenetic field intensity at the poles of the Earth





...... .. ...... .. ........ .... ... .... ... ..




Ques :79
What is the autocorrelation of the sequence




.. ... .. .......... (autocorrelation) ... ..




Ques :80
What is the cross correlation of the sequence




.. ... .. ... 1,2 ... .... ....... (cross correlation) ... ..





Ques :81
What is the DFT of a two sample sequence




.. ...... .. ... .. .. .. ... ... ..




Ques :82
Which of the following is true for horizontal loop electromagnetic survey
Shoulder maxima is higher on down dip side
Shoulder maxima is higher on up dip side
Shoulder maxima is always equal on both sides
Shoulder maxima depends on deviation of strike w.r.t. North
...... ... .. ... .. ....... ... ....... ........ ...... .. .... .... ..
..... ....... .... .... ... ... ... ... ..
..... ....... .. .... ... ... ... ... ..
..... ....... ..... ... ..... .... ..
..... ....... ..... ... ... .. ..... .. ....... .... ..
Ques :83










Ques :84
How will you obtain acceleration amplitude spectrum A from the displacement amplitude spectrum frequency)




........ .... (amplitude) ........ D .. ... .... ........ A .... ...... ...... .....)




Ques :85
What is the ztransform
of discretetime
unit step sequence





..............
...... ..... ... .. z
.......... ... ..




Ques :86
What is the name of the system whose output at time depends only on present and past input values
Recursive system
Nonrecursive
system
Causal system
Noncausal
system
.. .... .. ... ... .. ..... ...... ... n .. .... ....... .. ..... ..... ...... .. ....... .... ..
........ (Recursive ..
... ........ (Nonrecursive
..
..... (Causal) ..
..........
(Noncausal)
..

Ques :87
What is the periodicity of the Fourier transform of a discrete time signal




.. ..............
...... .. ..... .......... ... ............. ..... ..




Ques :88









Ques :89
What is the name of the log that is used to measure the variations in the borehole diameter with depth
Neutron log
Normal log
Caliper log
Gamma log
.. ... .. ... ... .. .. ..... .. ... ...... ... ... ..... .. ..... .. .... ..... .... .... ..
...... ...
....... ...
....... ...
.... ...
Ques :90
What is the least square solution of a linear inverse problem d Gm data matrix; G data Kernel; m matrix of model parameters)





.. ........ ...... ..... d Gm .. ..... .... (...... .......) ...... ... .. .... .......; G .... .....; m .... .......... ...
.......)




Ques :91









Ques :92








Ques :93
What is the expression for estimating the parameter corrections in the gradient method to solve nonlinear
inverse problem constant; A
matrix of partial derivatives w.r.t model parameters; difference between the observed data and calculated from the initial model.)





.. ....
....... ...... ..... .. ...... ... ...... ....... ..... ... .......... ...... .. .... ........ ... .. k .........; A ....
.......... .. ..... ... ...... ........ ... ....... (matrix of partial derivatives w.r.t model parameters); y ......... .... ..
......... .... .. ... ...... .... .. ....)




Ques :94
How will you write the inverse of a rectangular matrix A of order 4x5




4 x 5 ... .. .. ........ ....... .. ........ .... ........





Ques :95








Ques :96

What is the sequence of four steps of Genetic algorithm used for the global optimization of the nonlinear
inverse problem
Coding Crossover
Selection
Mutation
Coding Mutation
Crossover
Selection
Crossover Coding
Mutation
Selection
Coding Selection
Crossover
Mutation
... ........ ...... ..... .. ..... ............ ... ...... ......... ........ .. ... ..... .. ... ... ..
....... ..
.. ... ....
... ..
......
....... ..
...... ..
.. ... ....
...
.... ... ..
..... ..
...... ....
...
....... ....
... ..
.. ... ..
......
Ques :97
Which of the following is the name of an algorithm of the simulated annealing technique of global optimization
SunBath
HeatBath
RainBath
IceBath
...... ... .. ... .. ..... ............ ... ...... .......... ........ ..... .. .. ........ .. ... ..
.....
.......
......
......
Ques :98
Which of the following is categorized as Greedy algorithm
RidgeRegression
method
Genetic Algorithm

Simulated Annealing technique
Grid Search method
...... ... .. ..... ..... (Greedy) ........ .. .. ... ...... .... .... ..
..
..... .....
......... .....
.......... ........ .....
.. .... .....
Ques :99
R S P Q
S R Q P
P Q S R
Q P R S

R S P Q
S R Q P
P Q S R
Q P R S
Ques :100
1
0
1

1
0
1