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Latest Earth Science Exam Question (Objective Questions), MCQ in English

Subjects : Earth Science

Question Bank Earth Science Exam - English

Earth Science

Question 1Single Answer

A and B move clockwise around a circle. starting from a common point O. A takes 9 minutes to complete a round but re-starts after a delay of 1 minute. B takes 13 minutes to complete the round but restarts after a delay of 2 minutes. How many minutes after they began would they meet again at O ?

A
30
B
29
C
31
D
28

Question 2Single Answer

Fourteen of the students in a class are girls. Eight students in the class wear blue shirts. Two are neither girls nor wear blue shirts. Five students who wear blue shirts are girls. How many students are there in the class ?

A
19
B
29
C
17
D
24

Question 3Single Answer

A stick of length L is broken into two pieces at random. What is the average length of the smaller piece ?

A
L/6
B
L/4
C
L/3
D
L/2

Question 4Single Answer

A long-distance runner finds a water station after completing

of the total distance After covering another

of the total distance he gets medical-aid. Another runner joins him 4 km after the medical-aid station. The second runner stops 4 km before the completion of run, covering

of the total distance. What is the total distance ?

A
21 km
B
30 km
C
42 km
D
50 km

Question 5Single Answer

Movement of a car with respect to time is given below :

The average speed of the car is :

A
30.42
B
20.43
C
10.43
D
21.43

Question 6Single Answer

A fuel station sold diesel costing Rs.15000 to 150 persons on a day. If the lower limit of sale to a person is Rs.50, what is the maximum amount in rupees for which one person could have purchased diesel on that day ?

A
7450
B
7500
C
7550
D
7600

Question 7Single Answer

The area of the triangle formed by joining the points (2017, 2017), (2027, 2027) and (2037, 2017) is

A
2017
B
100
C
D

Question 8Single Answer

If Sangeeta’s daughter is my daughter’s mother, then how am I related to Sangeeta ?

A
Son is the only possibility
B
Son-in-law is the only possibility
C
Daughter is the only possibility
D
Son-in-law or daughter

Question 9Single Answer

Four males M₁, M₂, M₃, M₄ and four females F₁, F₂, F₃ and F₄ are sitting around a round table facing away from the table as shown in the figure below. If each one moves three positions to his/her right and then one position to the left, then in which direction does F₄ face ?

A
East
B
North - East
C
North - West
D
North

Question 10Single Answer

Prof. Murthy likes to let her students choose who their partners will be; however, no pair of students may work together for more than seven class periods in a row. Alice and Bob have worked together for seven class periods in a row. Calvin and Denny have worked together for three class periods in a row. Calvin does not want to work with Alice. Who should be assigned o work with Bob ?

A
Calvin
B
Alice
C
Denny
D
None

Question 11Single Answer

In a group of 44 players, 26 play hockey, 24 play football and 24 play cricket. Eight of them play both hockey and football, 12 play both football and cricket, and 5 play all the three games. How many play both hockey and cricket ?

A
10
B
15
C
None
D
7

Question 12Single Answer

It is given that

for any real number a Suppose for two real number x and y, (xy)* = (x)* (y)*. Then which of the following is necessarily true ?

A
x > 0 and y > 0
B
{x < 0 and y < 0} or {x > 0 and y > 0}
C
D

Question 13Single Answer

Number of times a research paper is viewed and cited is shown in the pict. In which month was the percentage increase in citation more than the double of the percentage increase in view ?

A
February
B
April
C
May
D
June

Question 14Single Answer

Which of the following options is the best choice for the missing number ?
0.1, 0.25, 0.3, 0.2, 0.5, 0.6, 0.3, ...., 0.9, 0.4, 1.0, 1.2

A
1.05
B
0.85
C
0.75
D
0.65

Question 15Single Answer

Consider a number 54 expressed in a base different from ten. What is the base of this number system if its equivalent value in the decimal system is 49 ?

Question 16Single Answer

Which of the options is appropriate for the blank space ?

Question 17Single Answer

In the diagram, what is the ratio of the total shaded area (of the circle and semi-circle) to the total area of the square and the retangle ?

Question 18Single Answer

Students are solving the same problem independently. If the probability that the first one solves the problem is

and the probability that the second solves the problem is

, what is the probability that at least one of them solves the problem ?

Question 19Single Answer

A ball is dropped from a height of 100 m. The ball after each bounce rises vertically by half its previous height (This means at the first bounce it rises by 50 m, by 25 m at the second bounce and so on). What is the vertical distance travelled by the ball between the first and the fifth bounce ?

Question 20Single Answer

Three semi-circles are drawn inside a big circle as shown in the figure. If the radius of the two identical smaller semi-circles is th of that of the big circle and the radius of the bigger semi-circle

is twice that of the small semi-circle, what proportion of the big circle's area is shaded ?

Question 21Single Answer

Which one of the following isotope dating methods is based on the parent isotope abundances and not on the daughter isotope abundances ?

A
K – Ar dating
B
U – Pb dating
C
Radiocarbon dating
D
Rb – Sr dating

Question 22Single Answer

Which one of the following SiO₂ polymorphs may form because of meteorite impact ?

A
Quartz
B
Tridymite
C
Opal
D
Stishovite

Question 23Single Answer

Correctly, match the mineral group and corresponding minerals that are used for dating geological events
1. Phophate P. Galena
2. Silicate Q. Monazite
3. Oxide R. Zircon
4. Sulphide S. Baddeleyite

A
1-P, 2-Q, 3-R, 4-S
B
1-Q, 2-R, 3-S, 4-P
C
1-R, 2-Q, 3-S, 4-P
D
1-S, 2-Q, 3-R, 4-P

Question 24Single Answer

Correctly match the processes with the corresponding mineral concentrations :
Processes Mineral concentration
1. Residual enrichment P. Mn-oxide nodule
2. Chemical Q. Talc sedimentation
3. Metamorphic R. Chromite
4. Magmatic S. Bauxite

A
1-Q, 2-P, 3-S, 4-R
B
1-S, 2-R, 3-P, 4-Q
C
1-Q, 2-R, 3-P, 4-S
D
1-S, 2-P, 3-Q, 4-R

Question 25Single Answer

Which one of the mineral sequences, arranged in the order of increasing hardness (in Mohs scale) is correct ?

A
Talc, cacite, gypsum, apatite
B
Orthoclase, topaz, quatz, diamond
C
Calcite, apatite, orthoclase, quartz
D
Gypsum, talc, calcite, apatite

Question 26Single Answer

For a given discharge, flow can be transmitted along a stream either as deep and slow moving .............. flow or as a shallow and rapid .... flow .

A
subcritical, supercritical
B
supercritical, subcritical
C
critical, subcritical
D
supercritical, critical

Question 27Single Answer

The first consequence of earliest differentiation of the Earth is the formation of the............... .

A
continental crust
B
core
C
oxygen rich atmosphere
D
oceans

Question 28Single Answer

What is the third most abundant element (after H and He) in the solar system ?

A
O
B
Fe
C
Si
D
Ni

Question 29Single Answer

Which of the following classes of meteorites is one of the most primitive objects of our solar system ?

A
Achondrites
B
Iron meteorites
C
Stony-Iron meteorites
D
Chondrites

Question 30Single Answer

Which of the following processes is not related to plate tectonics ?

A
Subduction
B
Mountain building
C
Rise of mantle plume
D
Sea floor spreading

Question 31Single Answer

During spheroidal weathering, a block of rock converts to a spheroid due to :

A
rapid physical weathering at the corners than at the smooth faces
B
rapid chemical weathering at the corners than at the smooth faces
C
physical and chemical weathering acting equally on the block
D
breaking of corners during transport

Question 32Single Answer

Mass wasting wherein a mass of rock or weathered debris moves downhill along a curved shear surface is defined as :

A
Rotational landslide
B
Translational landslide
C
Lahar
D
Block glide

Question 33Single Answer

Progradation or seaward migration of the shoreline by deposition is best represented by :

A
beach ridges
B
coastal sand dunes
C
wave-cut platforms and stacks
D
shingle beaches

Question 34Single Answer

Rock-floored terraces, preserving part of the former valley flat are called :

A
abrasion ramps
B
alluvial terraces
C
fill terraces
D
strath terraces

Question 35Single Answer

Which one of the following is not typicall associated with strike-slip faults ?

A
Offset drainage
B
Barbed drainage
C
Shutter ridge
D
Sag pond

Question 36Single Answer

Which type(s) of chemical reactions occur(s) during the weathering of pyroxene ?

A
Hydrolysis
B
Oxidation
C
Hydrolysis and oxidation both
D
Solution and oxidation both

Question 37Single Answer

Multi-faceted cobbles and pebbles that show wind abrasion are called :

A
erratics
B
yardangs
C
ventifacts
D
nubbins

Question 38Single Answer

A red coloured and clayey soil horizon is termed as :

A
O horizon
B
A horizon
C
E horizon
D
B horizon

Question 39Single Answer

The wavelength/colour at which solar radiation peaks is :

A
blue
B
green
C
red
D
ultraviolet

Question 40Single Answer

Which of the following ecosystems has the greatest biomass ?

A
Oceans
B
Grasslands & Croplands
C
Forests
D
Freshwater

Question 41Single Answer

In a homogeneous isotropic medium with a free surface :

A
only Rayleigh waves can exist
B
only Love waves can exist
C
both Rayleigh waves and Love waves can exist
D
neither Rayleigh waves nor Love waves can exist

Question 42Single Answer

Mid Oceanic spreading ridges are characterized by :

A
dip slip faults
B
normal faults
C
strike slip faults
D
thrust faults

Question 43Single Answer

Density contrast is the maximum across the :

A
crust-mantle boundary
B
mantle-outer core boundary
C
outer-core and inner-core boundary
D
upper crust and lower crust boundary

Question 44Single Answer

Earth's reference spheroid :

A
coincides with the geoid in the oceanic region
B
coincides with the geoid in the land region
C
is below the geoid in the oceanic region
D
is above the geoid in the oceanic region

Question 45Single Answer

Two planets A and B orbit around their Sun, B being four times farther away than A from their Sun. Then the length of the year on B, compared to that A, would be :

A
the same
B
twice
C
four times
D
eight times

Question 46Single Answer

Intraplate earthquakes predominantly occur in the depth range

A
0-40 km
B
40-100 km
C
100-300 km
D
300-700 km

Question 47Single Answer

On the Earth's surface, the Earth's normal magnetic field :

A
decreases both with elevation and depth
B
decreases with elevation, but increases with depth
C
increases with elevation, but decreases with depth
D
increases both with elevation and depth

Question 48Single Answer

Gravity values measured at four stations A, B, C and D (see in the figure) of different elevations ha, ha, he and ho are found to be equal . Then,

A
h_A > h_B > h_D > h_C
B
h_C > h_B > h_A > h_D
C
h_B > h_C > h_D > h_A
D
h_D > h_A > h_B > h_C

Question 49Single Answer

Electrically, sphalerite (ZnS) and cinnabar (HgS) are :

A
both good conductors
B
both bad conductors
C
good and bad conductors, respectively
D
bad and good conductors, respectively

Question 50Single Answer

P and S waves, from an earthquake, incident on the core - mantle boundary are critically refracted :

A
at the same location
B
at different locations, P being critically refracted closer to the epicentre
C
at different locations, S being critically refracted closer to the epicentre
D
nowhere

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Earth Science

Question 51Single Answer

Aviation hazards in North West India in the summer months are generally due to :

A
fog
B
heat low
C
cyclones
D
dust-storms

Question 52Single Answer

In which set of the following atmospheric layers, the temperature increases with altitude ?

A
Thermosphere and troposphere
B
Stratosphere and troposphere
C
Mesosphere and troposphere
D
Stratosphere and thermosphere

Question 53Single Answer

Ozone depletion in the stratosphere causes :

A
increase in greenhouse effect
B
cooling of the
C
increase of infrared radiation in the troposphere
D
increase of ultraviolet radiation in the troposphere

Question 54Single Answer

During the December solstice,

A
days are long and nights are short in the northern hemisphere
B
days and nights are of equal duration
C
noon rays of the Sun are over
D
noon rays of the Sun are over

Question 55Single Answer

Which one of the following has a positive correlation with the NINO, INDEX, which represents ENSOvariability ?

A
Indian summer monsoon rainfall
B
Rainfall over Tamil Nadu during northeast monsoon
C
Temperature in Tamil Nadu during northeast monsoon
D
Rainfall in Australia during summer monsoon

Question 56Single Answer

During a break-monsoon condition in summer, the monsoon trough moves :

A
closer to the southern foot hills of Himalaya Or
B
northward beyond Himalaya
C
closer to Chennai
D
over Kolkata

Question 57Single Answer

A flow associated with a balance between Coriolis and centrifugal forces is known as :

A
cyclostrophic flow
B
inertial flow
C
geostrophic flow
D
gradient flow

Question 58Single Answer

For which of the following phenomena, the typical timescale does not exceed a few hours ?

A
Frontal system
B
Ocean eddy
C
Ocean mixing in the surface layer
D
response of vegetation to oppose excess evaporation

Question 59Single Answer

In the natural atmosphere with supersaturation rarely more than 1%, the most common form of nucleation associated with change of vapour to liquid is :

A
homogeneous nucleation
B
heterogeneous nucleation
C
spontaneous nucleation
D
contact nucleation

Question 60Single Answer

Which one of the following is NOT a thermally driven direct circulation ?

A
Polar Cell in the southern hemisphere
B
Hadley Cell
C
Ferrel Cell
D
Polar Cell in the northern hemisphere

Question 61Single Answer

Pick out the wrong statement: In the ocean :

A
major elements are conservative
B
a few minor elements are conservative
C
non-conservative elements have short residence times
D
all non-conservative elements are bioactive

Question 62Single Answer

The mid-depth oxygen minimum zones are associated with maxima/minima of the elements Mn, Cr, U and V. Which of the following is the correct association ?

A
Minima of Mn and maxima of Cr, U and V
B
Maxima of Mn and minima of Cr, U and V
C
Maxima of Mn and Cr and minima of U and V
D
Minima of Mn and Cr and maxima U and V

Question 63Single Answer

The least abundant gas in the Earth's atmosphere is :

A
nitrogen
B
oxygen
C
carbon dioxide
D
argon

Question 64Single Answer

For water mass identification, which of the two parameters are essential ?
(a) in situ temperature
(b) in situ salinity
(c) potential temperature
(d) potential density

A
(a) and (b)
B
(a) and (d)
C
(b) and (c)
D
(c) and (d)

Question 65Single Answer

Which one of the following does not form a part of the oceanic conveyer belt circulation ?

A
North Atlantic deep water
B
Antarctic bottom water
C
Subtropical gyre
D
Indonesian through flow

Question 66Single Answer

Tidal amplitude increases from south to north along the west coast of India because of the increase in the :

A
width of the continental shelf from south to north
B
Coriolis force from south to north
C
steepness of the continental slope from south to north
D
wind forcing from south to north

Question 67Single Answer

Which two of the following processes most commonly occur when a surface gravity wave propagates into a shallow water region from deep water ?
(a) refraction
(b) reflection
(c) diffraction
(d) shoaling

A
(a) and (b)
B
(a) and (c)
C
(a) and (d)
D
(b) and (d)

Question 68Single Answer

Autotrophic phytoplankton are absent in the :

A
ultra oligotrophic marine regions
B
cold, lowly illuminated surface waters
C
euphotic layers laden with marine snow
D
hadal region of all the major oceans

Question 69Single Answer

Which one of the functions performed by Smarine benthic polychaetes is ecologically advantageous ?

A
Acidification
B
Deoxygenation
C
Detoxification soited
D
Bioturbation

Question 70Single Answer

Which one of the essential elements is the most critical for the growth and production of diatoms in the Antarctic waters ?

A
Silicon
B
Iron
C
Vanadium
D
Molybdenum

Question 71Single Answer

Match the rocks/minerals with their Indian Occurrences .
Rock/Mineral Indian Occurrences
1. Komatiite P. Jhamarkotra
2. Eclogite Q. Khariar
3. Nepheline R. Nuggihalli Syenite
4. Phosphorite S. Ladakh

A
1-P, 2-R, 3-S, 4-Q
B
1-R, 2-Q, 3-P, 4-S
C
1-R, 2-S, 3-Q, 4-P
D
1-P, 2-Q, 3-S, 4-P

Question 72Single Answer

Isotope ratios ¹⁴³Nd / ¹⁴⁴Nd and ⁸⁷Sr / ⁸⁶Sr are measured today in a rock that formed at 2Ga by melting of a depleted mantle source. Which of the following is most likely ?

A
¹⁴³Nd / ¹⁴⁴Nd and ⁸⁷Sr / ⁸⁶Sr ratios in the rock are the same as in the source mantle
B
¹⁴³Nd / ¹⁴⁴Nd ratios is higher and ⁸⁷Sr / ⁸⁶Sr is lower than the source mantle
C
¹⁴³Nd / ¹⁴⁴Nd ratios is lower and ⁸⁷Sr / ⁸⁶Sr is higher than the source mantle
D
Both ¹⁴³Nd / ¹⁴⁴Nd and ⁸⁷Sr / ⁸⁶Sr ratios are lower than that of the source

Question 73Single Answer

If the thermodynamic equation,

relates the temperature–fluid composition relationship at constant pressure for a model devolatilization reaction, A = B + mH₂O + nCO₂, which of the following diagrams correctly depicts a decarbonation reaction :

Question 74Single Answer

The diagram below shows 3 important sequence stratigraphic surfaces (1, 2, 3) in a sedimentary sequence, namely sequence boundary (SB), maximum flooding surface A(MFS) and transgressing surface (TS). Which one of the combinations below is correct ?

A
1-SB, 2-MFS, 3-TS
B
1-TS, 2-SB, 3-MFS
C
1-MFS, 2-TS, 3-SB
D
1-MFS, 2-SB, 3-TS

Question 75Single Answer

Which one of the following combinations of parameters best explains the presence of gas hydrates in the continental shelf ? (V, and Vs are velocities of seismic waves)

A
d¹³ C Carbonate < – 40% - abrupt increase in both V_p and V_s
B
d¹³ C Carbonate ~ 0% – abrupt decrease in both V_P and V_S
C
d¹³ C Carbonate ~ +5% - abrupt increase in V_P but decrease in V_S
D
d¹³ C Carbonate ~ + 10% – abrupt decrease in V_P but increase in V_S

Question 76Single Answer

Match the following :
1. Sparitic Limestone P. Alginite
2. Arenite Q. Floating clast
3. Debrite R. Quartz overgrowth
4. Organic shale S. Isopachous cement

A
1-S, 2-R, 3-Q, 4-P
B
1-R, 2-Q, 3-P, 4-S
C
1-Q, 2-P, 3-S, 4-R
D
1-P, 2-S, 3-R, 4-Q

Question 77Single Answer

Concentration of La and Co, measured in olivine (Ol) phenocryst and ground mass (gm) of a picritic basalt, are :
La^ol = 10 ppb; La^gm = 2 ppm
Co^ol = 4 ppm; Co^gm = 2 ppm
Given the above information which of the following statements on the mineral-melt partitioning behaviour of La and Co is correct ? (K_d is partition coefficient) :

A
La is incompatible and Co is compatible
B
both are compatible
C
both are imcompatible
D
La is compatible and Co is incompatible

Question 78Single Answer

The diagram below shows a schematic of a river system with its tributaries (I & II) and distributaries (III & IV). It also shows the amount of water carried by them in percentage of the total. If the concentrations of Ca in I and II are 40 ppm and 60 ppm, respectively then which of the following statements about the concentration of Ca is correct ? (Ca concentrations at A, B and C are, respectively, Ca_A, Ca_B and Ca_C) .

A
Ca_A = Ca_B = Ca_c
B
Ca_A > Ca_B > Ca_C
C
Ca_A > Ca_B < Ca_C
D
Ca_A = Ca_B > Ca_C

Question 79Single Answer

Abbreviations : L: Liquid; ksp_ss : K-feldspar solid solution; Ab_ss; Albite solid solution Based on the above phase diagram, which of the following sequences correctly describes solidus(s) and subsolidus(ss) phase evolution during equilibrium (case A) and fractional crystallization (case B) of a melt of composition X cooling below solidus :

A
A; ksp_ss(s) ® exsolution(ss), B; ksp_ss(s) ® exsolution(ss), Ab_ss + ksp_ss(s)
B
A; ksp_ss(s) ® Ab_ss(s) + ksp_ss(s) ® exsolution(ss), B; ksp_ss(s) ® exsolution(ss)
C
A;ksp_ss(s) ® exsolution(ss) ® Ab_ss(s) + ksp_ss(s), B; ksp_ss(s) ® ksp_ss(s) ® exsolution(ss)
D
A; ksp_ss(s) ® exsolution(ss), B; ksp_ss(s) ® Ab_ss(s) + ksp_ss(s) ® exsolution(ss)

Question 80Single Answer

What is the maximum order of X-ray diffraction possible from (121) plane of a crystal with d-spacing of 3.8 Å. Wavelength of the X-ray is 1.54 Å .

Question 81Single Answer

The point group of symmetry of a crystal having two horizontal 2-fold axes of symmetry that are bisected by two vertical mirror planes of orthogonal orientation is :

A
B
2 mm
C
D

Question 82Single Answer

If a, b, g are refractive indices corresponding to X, Y and Z vibration directions in a biaxial mineral, choose the option with the highest order of interference colour in its principal section of ellipsoid. Assume the minerals have a uniform thickness .

Question 83Single Answer

Which one of the following substitution vectors in amphibole group of minerals best explains high pressure/low-temperature metamorphism ? Values under parenthesis refer to co-ordination number of cations .

A
Ca(VIII) + Mg(VI) ? Na(VIII) + Al(VI)
B
(XII) + Si(IV) ? Na(XII) + Al(IV)
C
Mg(VI) + Si(IV) ? Al(VI) + Al(IV)
D
(XII) + Mg(IV) + Si₂(IV) ? Na(XII) + Al(VI) + Al₂(IV)

Question 84Single Answer

Match the outcrop patterns of folds with corresponding types .

A
1-P, 2-Q, 3-R, 4-S
B
1-R, 2-S, 3-P, 4-Q
C
1-R, 2-S, 3-Q, 4-P
D
1-S, 2-R, 3-P, 4-Q

Question 85Single Answer

The outcrop pattern of a dipping bed (shaded) showing intersections with topographic contours (marked by dashed lines, and at altitudes x and 2x units above MSL) at P, Q, R and S is given in the diagram below. Assuming the horizontal distance between two strike lines at different altitudes, and in the direction of dip is 1.732x units, the dip amount and direction is calculated at

A
30°N
B
60°S
C
60°N
D
30°S

Question 86Single Answer

The below diagram shows a schematic planar configuration of three tectonic plates P - I, P-2 and P-3 and two plate boundaries at a spreading ridge (MOR) and subduction zone. A - B - C is a 1000 km long hot spot track formed over a hotspot (HS) and for a period of 40 Myr. The ages of the volcanoes on the track would yield which one of the following relationships against their distances from the current location of the hotspot ?

Question 87Single Answer

Two box-car functions of equal height and unequal width are convolved. The output function has the shape of a :

A
box-car
B
ramp
C
trapezoid
D
triangle

Question 88Single Answer

The following are some tabulated values of x and y which obey the relation y = ax .

The optimum value of the proportionality constant is :

A
2.98
B
2.90
C
2.83
D
2.76

Question 89Single Answer

g_A, g_B, g_C, and g_D are the gravity values measured at four widely separated stations A, B, C and D along an E-W profile across an escarpment like topography as shown in the following figure. Then :

A
g_A > g_B > g_D > g_C
B
g_D > g_C > g_B > g_A
C
g_D > g_C > g_A > g_B
D
g_A > g_B > g_C > g_D

Question 90Single Answer

The gravity value measured over a 1.0 km thick elevated land mass is found to be smaller than the normal gravity value by 310 milligals. Which of the following statements is TRUE ?

A
The level of isostatic compensation of the land mass cannot be ascertained due to inadequate data
B
The land mass is isostatically undercompensated
C
The land mass is isostatically overcompensated
D
The land mass is isostatically compensated

Question 91Single Answer

If (F_max, F_min), (V_max , V_min) and (H_max, H_min ) are the maximum and minimum values of the Earth's normal magnetic field on the Earth's surface, and its vertical and horizontal components respectively, then :

Question 92Single Answer

Which one of the following combinations of dip and declination, respectively, can be possessed by the thermoremanent magnetism of a Cretaceous (~70 Ma) igneous rock located in central India ?

A
30°, 330°
B
40°, 150°
C
–20°, 150°
D
–30°, 30°

Question 93Single Answer

A planet of radius R has a thick fluid core of radius Rc and a negligibly thin crust. P and S waves, which travel in its mantle with uniform velocities respectively, are not recorded beyond an epicentral distance of 90°. Then Rc /R =

Question 94Single Answer

Gravity anomalies at two points, distant 2 units and 5 units respectively from the position of the maximum gravity anomaly are in the ratio 8:1. Then, the depth (in units) to the centre of the ore body is :

Question 95Single Answer

The total field magnetic anomaly at a location of magnetic latitude 30° N due to an inhomogeneity is zero. Then the ratio of the anomalies in the vertical and horizontal components due to the same inhomogeneity would be :

Question 96Single Answer

A resisivity survey yields a K type curve. The sequence of geological formations, from top to bottom, that best explains the curve could be :

A
shale, compact sandstone, quartzite
B
basalt, water saturated shale, gneiss
C
gravel, water saturated fractured granite, gneiss
D
'laterite, compact basalt, water saturated fractured basalt

Question 97Single Answer

Which one of the following VES curves is NOT possible over a sequence of homogeneous layers ?

A
KH
B
AK
C
HA
D
KA

Question 98Single Answer

In a seismic survey over a refractor/reflector with a P wave velocity twice that of the overburden, both the reflected and refracted waves are recorded simultaneously at an offset distance of 2.31 km from the shot point at 2.3 s, respectively, after the shot. The thickness of the overburden and the velocity of the refractor are :

A
2 km and 2 km/s
B
2 km and 4 km/s
C
3 km and 2 km/s
D
3 km and 4 km/s

Question 99Single Answer

An n-fold, 12 channel CDP survey was carried out with the source spacing (S) equal to the receiver spacing (R). The source spacing required in units of receiver spacing to obtain a 2n foldage is :

A
S = 0.5 R
B
S = 0.75 R
C
S = R
D
S = 2R

Question 100Single Answer

The travel time line segments in an up-dip seismic refraction survey have gradients of 0.6666 sec/ km and 0.3333 sec/km respectively. If the critical angle is 60°, the dip angle of the refractor is :

A
10°
B
15°
C
30°
D
45°

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