Firstranker's choice
GATE 2018
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Q. 1 – Q. 5 carry one mark each.
Q.1 "When she fell down the ______ , she received many _______ but little help.”
The words that best fill the blanks in the above sentence are
(A) stairs, stares (B) stairs, stairs
(C) stares, stairs (D) stares, stares
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Q.2 "In spite of being warned repeatedly, he failed to correct his ________ behaviour."
The word that best fills the blank in the above sentence is
(A) rational (B) reasonable (C) errant (D) good
Q.3 For 0 = x = 2p, sin x and cos x are both decreasing functions in the interval ___________
(A) (0, p/2) (?) (p/2,p) (C) (p, 3p/2) (D) (3p/2,2p)
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Q.4 The area of an equilateral triangle is v3. What is the perimeter of the triangle?
(A) 2 (B) 4 (C) 6 (D) 8
Q.5 Arrange the following three-dimensional objects in the descending order of their volumes:
(i) A cuboid with dimensions 10 cm, 8 cm and 6 cm
(ii) A cube of side 8 cm
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(iii) A cylinder with base radius 7 cm and height 7 cm(iv) A sphere of radius 7 cm
(A) (i), (ii), (iii), (iv) (B) (ii), (i), (iv), (iii)
(C) (iii), (ii), (i), (iv) (D) (iv), (iii), (ii), (i)
Q. 6 – Q. 10 carry two marks each.
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Q.6 An automobile travels from city A to city B and returns to city A by the same route. The
speed of the vehicle during the onward and return journeys were constant at 60 km/h and
90 km/h, respectively. What is the average speed in km/h for the entire journey?
(A) 72 (B) 73 (C) 74 (D) 75
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Firstranker's choice
GATE 2018
Q.7 A set of 4 parallel lines intersect with another set of 5 parallel lines. How many
parallelograms are formed?
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(A) 20 (B) 48 (C) 60 (D) 72Q.8 To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of
6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000
candidates. Question B was answered correctly by 2,50,000 candidates. Question C was
answered correctly by 2,60,000 candidates. Both questions A and B were answered
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correctly by 1,00,000 candidates. Both questions B and C were answered correctly by90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates.
If the number of students answering all questions correctly is the same as the number
answering none, how many candidates failed to clear the test?
(A) 30,000 (B) 2,70,000 (C) 3,90,000 (D) 4,20,000
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Q.9 If x2 + x - 1 = 0 what is the value of x4 + 1/x4?
(A) 1 (B) 5 (C) 7 (D) 9
Q.10 In a detailed study of annual crow births in India, it was found that there was relatively no
growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another
unrelated study, it was found that the revenue from cracker sales in India which remained
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fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006.The solid line in the graph below refers to annual sale of crackers and the dashed line refers
to the annual crow births in India. Choose the most appropriate inference from the above
data.
(A) There is a strong correlation between crow birth and cracker sales.
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(B) Cracker usage increases crow birth rate.(C) If cracker sale declines, crow birth will decline.
(D) Increased birth rate of crows will cause an increase in the sale of crackers.
END OF THE QUESTION PAPER
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Firstranker's choice
GATE 2018
PART A: COMPULSORY SECTION FOR ALL CANDIDATES
Q. 1 – Q. 25 carry one mark each.
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Q.1 Which one of the following periods has the longest time duration?
(A) Ordovician (B) Cretaceous (C) Jurassic (D) Silurian
Q.2 A siliciclastic sedimentary rock consisting predominantly of the same type of gravel-sized
clasts is called
(A) Polymict conglomerate. (B) Arkose.
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(C) Oligomict conglomerate. (D) Petromict conglomerate.Q.3 Brown coal that has high moisture content and commonly retains many of the original
wood fragments is called
(A) Anthracite. (B) Bituminous coal.
(C) Lignite. (D) Peat.
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Q.4 The speed of revolution of the Earth around the Sun is
(A) maximum at Perihelion.
(B) minimum at Perihelion.
(C) maximum at Aphelion.
(D) equal at Aphelion and Perihelion.
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Q.5 The geometrical factor for the following electrode configuration is
(?) pa (?) 2pa (C) 3pa (D) 4pa
Q.6 Which one of the following geophysical methods uses the physical property ‘Dielectric
Constant'?
(A) Gravity (B) Ground Penetrating Radar
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(C) Seismic (D) Self-PotentialQ.7 Pascal second is a unit of
(A) seepage force. (B) dynamic viscosity.
(C) kinematic viscosity. (D) permeability.
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Firstranker's choice
GATE 2018
Q.8 Which one of the following statements is CORRECT?
(A) Strength of a rock decreases with increase in confining pressure.
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(B) Strength of a rock increases with increase in temperature.(C) Strength of a rock increases with increase in strain rate.
(D) Strength of a rock increases with increase in pore water pressure.
Q.9 The geomorphic feature ‘horns' are formed by
(A) wind erosion. (B) river erosion.
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(C) wind deposition. (D) glacial erosion.Q.10 A melanocratic porphyritic rock containing phenocrysts of biotite, with feldspar restricted
to the groundmass, is called
(A) trachyte. (B) dacite. (C) andesite. (D) lamprophyre.
Q.11 The supercontinent that existed in the late Mesoproterozoic to early Neoproterozoic time
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was(A) Kenorland. (B) Columbia. (C) Rodinia. (D) Pangaea.
Q.12 The figure below shows the triple junction between three plates A, B and C. The boundary
between the plates A and B is a ridge with a half-spreading rate of 4 cm/year. The A-C and
B-C boundaries are collinear and orthogonal to the A-B ridge. The A-C boundary is a
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dextral transform fault with a relative velocity of 6 cm/year. The boundary between platesB and C is a
(A) dextral transform fault with a relative velocity of 10 cm/year.
(B) dextral transform fault with a relative velocity of 2 cm/year.
(C) sinistral transform fault with a relative velocity of 2 cm/year.
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(D) sinistral transform fault with a relative velocity of 6 cm/year.Firstranker's choice
GATE 2018
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Q.13 A rock follows Mohr-Coulomb failure criterion. Which one of the Mohr-Coulomb failure
envelopes shown below allows failure of the rock under stress state Y, but not under stress
state X?
(A) PP' (B) QQ' (C) RR' (D) SS'
Q.14 The maximum and the minimum principal stresses are denoted by s1 and s3, respectively.
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The differential stress can have an absolute value greater than s1 when(A) s1 and s3 are both compressive.
(?) s? is compressive and 63 is tensile.
(C) s1 and 63 are equal.
(D) s1 and 63 are both tensile.
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Q.15 The geoid can be best defined as
(A) an oblate spheroid that best approximates the shape of the earth.
(B) a surface over which the value of gravity is constant.
(C) the physical surface of the earth.
(D) an equipotential surface of gravity of the earth.
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Firstranker's choice
GATE 2018
Q.16 For a layered isotropic medium with a flat horizontal free surface, match the wave types
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listed in Group-I with their corresponding polarizations listed in Group II.Group-I Group-II
P. P-waves 1. Particle motion is transverse to the direction of wave
propagation.
Q. S-waves 2. Particle motion is transverse to the direction of wave
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propagation and confined to the horizontal plane.R. Rayleigh waves 3. Particle motion is parallel to the direction of wave
propagation.
S. Love waves 4. Particle motion is elliptical.
(A) P-1; Q-3; R-4; S-2 (B) P-3; Q-1; R-4; S-2
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(C) P-3; Q-1; R-2; S-4 (D) P-2; Q-3; R-1; S-4Q.17 A ‘gentle' fold with an interlimb angle equal to 160° appears tight (apparent interlimb
angle equal to 20°) in horizontal section. According to the plunge of the fold axis, it can
also be classified as
(A) horizontal fold.
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(C) steeply plunging fold.(B) gently plunging fold.
(D) vertical fold.
Q.18 The unit of shear modulus (rigidity modulus) is
(A) kg m-1s-2 (B) m2 s-2 (C) kg m-2 s-2 (D) m-1
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Q.19 With increasing activity of silica, the CORRECT order of appearance of minerals in a
weathering environment with constant ratio of activities of K+ and H+ is
(A) gibbsite ? kaolinite ? pyrophyllite
(B) gibbsite ? pyrophyllite ? kaolinite
(C) kaolinite ? gibbsite ? pyrophyllite
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(D) pyrophyllite ? gibbsite ? kaoliniteFirstranker's choice
GATE 2018
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Q.20 Match the items listed in Group-I with those listed in Group-II.
Group-I Group-II
P. Mica 1. Beldih
Q. Uranium 2. Koderma
R. Phosphate 3. Agucha
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S. Zinc 4. Gogi(A) P-2,Q-3, R-4, S-1 (B) P-2, Q-4, R-1, S-3
(C) P-4, Q-2, R-3, S-1 (D) P-3, Q-1, R-4, S-2
Q.21 Which one of the following corrections is always added during reduction of the observed
gravity data?
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(A) Latitude (B) Free-air (C) Bouguer (D) TerrainQ.22 The magnitudes of the total geomagnetic field at the equator and pole are denoted by BE
and Bp, respectively. Which one of the following is TRUE?
(A) BP ˜ 4 BE (B) BP ˜ 2 BE (C) BP ˜ BE (D) BP ˜ 1/2 BE
Q.23 Assume a flat earth with crustal thickness of 35 km and average crustal and upper mantle
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P-wave velocities of 6.4 km.s-1 and 8.1 km.s-1, respectively. The minimum distance fromthe epicenter of a near surface earthquake at which Pn-waves are observed is ___________ km.
Q.24 Given that the velocity of P-waves in a sandstone matrix is 5600 m/s and that in oil is 1200
m/s, the velocity of P-wave propagation in oil saturated sandstone with 30% porosity is ___________ m/s. (Use Wyllie time average equation.)
Q.25 If the total porosity of a soil is 20%, its void ratio (%) is ___________.
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Firstranker's choice
GATE 2018
PART B (SECTION 1): FOR GEOLOGY CANDIDATES ONLY
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Q. 26 – Q. 55 carry two marks each.
Q.26 Which one of the following Himalayan lithounits predates India-Eurasia collision?
(A) Kasauli sandstone (B) Rangit Pebble Slate
(C) Annapurna granite (D) Lower Karewa sandstone
Q.27 Which one of the following ore minerals shows internal reflection?
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(A) Orpiment (B) Magnetite (C) Pyrite (D) MolybdeniteQ.28 Which one is CORRECT for the following equilibrium reaction between quartz and
magnetite:
Si16O16O + Fe316O318O = Si16O18O + Fe316O4?
(A) 1000 ln a = ?qtz-mag where a = K1/n (K is the equilibrium constant at the specified
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temperature and n is a constant quantity)(?) 1000 ln a = ?qtz-mag where a = Kn (K is the equilibrium constant at the specified
temperature and n is the number of exchangeable atomic sites)
(C) (ln a /1000) = ?qtz-mag where a = K1/n (K is the equilibrium constant at the specified
temperature and n is a constant quantity)
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(D) 1000 ln a = ?qtz-mag where a = K/n (K is the equilibrium constant at the specifiedtemperature and n is the number of exchangeable atomic sites)
Q.29 Match the modes of life (listed in Group I) with the corresponding bivalve genera (listed in
Group II).
Group I Group II
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P. Burrowing 1. MytilusQ. Recumbent unattached 2. Pecten
R. Byssally attached 3. Mya
S. Swimming 4. Gryphaea
(A) P-4, Q-3, R-2, S-1 (B) P-3, Q-4, R-1, S-2
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(C) P-2, Q-3, R-1, S-4 (D) P-3, Q-1, R-4, S-2Firstranker's choice
GATE 2018
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Q.30 Based on the hypothetical litholog given below that shows a continuous succession of
sedimentary rocks, which one of the following statements is CORRECT?
(A) The rocks range from Cambrian to Cretaceous and show change in depositional
environment from marine to continental.
(B) The rocks range from Cambrian to Triassic and show change in depositional
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environment from marine to continental.(C) The rocks range from Cambrian to Cretaceous and show change in depositional
environment from continental to marine.
(D) The rocks are Palaeozoic in age and show change in depositional environment from
marine to continental.
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Firstranker's choice
GATE 2018
Q.31 Which one of the following cladograms shows the CORRECT interrelationships among the
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major groups of vertebrates?(A) Cladogram I (B) Cladogram II (C) Cladogram III (D) Cladogram IV
Q.32 Which one of the following stratigraphic successions is in the CORRECT chronological
order (from older to younger)?
(A) Rajmahal, Dubrajpur, Barakar
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(B) Fenestella Shale, Muth Quartzite, Syringothyris Limestone(C) Bagh Bed, Lameta Formation, Deccan Traps
(D) Singhbhum Granite, Kolhan Group, Older Metamorphic Gneiss
Q.33 Match the items listed in Group I with their appropriate description listed in Group II.
Group I Group II
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P. Peloids 1. Grains containing nucleus surrounded by irregular, non-concentric laminae.
Q. Ooids 2. Small micritic grains without internal structure
R. Oncoids 3. Rounded grains with a thin coating of micrite.
S. Cortoids 4. Spherical grains consisting of regular laminae in concentric
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rings(A) P-3, Q-1, R-4, S-2 (B) P-2, Q-4, R-1, S-3
(C) P-3, Q-4, R-1, S-2 (D) P-2, Q-3, R-4, S-1
Firstranker's choice
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GATE 2018
Q.34 Which one of the following is an image rectification technique?
(A) Histogram equalization
(B) Density slicing
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(C) Histogram normalization(D) Rubbersheeting
Q.35 Match the items listed in Group I with those in Group II.
Group I Group II
P. Determination of coefficient of compressibility of soils 1. Brazilian test
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Q. A method of slope stabilization 2. OvercoringR. A method of in situ stress determination 3. Oedometer test
S. Determination of indirect tensile strength of rocks 4. Shotcreting
(A) P-4, Q-2, R-3, S-1 (B) P-1, Q-4, R-2, S-3
(C) P-3, Q-2, R-1, S-4 (D) P-3, Q-4, R-2, S-1
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Q.36 Match the items listed in Group I with those listed in Group II.
Group I Group II
P. Crevasse 1. River
Q. Yardang 2. Groundwater
R. Mesa 3. Wind
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S. Stalactite 4. Glacier(A) P-4, Q-3, R-1, S-2 (B) P-3, Q-1, R-4, S-2
(C) P-4, Q-2, R-3, S-1 (D) P-1, Q-2, R-3, S-4
Firstranker's choice
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GATE 2018
Q.37 In the hypothetical isobaric ternary liquidus projection diagram given below, solid phases
A, B, C, D and E exist in equilibrium with liquid. The reaction taking place at the isobaric
invariant point W is
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(A) Liquid (at W) = B + D + E
(B) Liquid (at W) = A + B + D
(C) Liquid (at W) + E = B + D
(D) Liquid (at W) + B + D = E
Q.38 Match the optical properties listed in Group I with the corresponding mineral in Group II.
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Group I Group IIP. Brown colour, very high refractive index, very high birefringence, 1. Apatite
biaxial positive
Q. Colourless, very high refractive index, low birefringence, uniaxial 2. Rutile
negative
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R. Deep reddish-brown colour, very high refractive index, very high 3. Zirconbirefringence, uniaxial positive
S. Colourless, very high refractive index, very high birefringence, 4. Titanite
uniaxial positive
(A) P-4, Q-1, R-2, S-3 (B) P-1, Q-2, R-4, S-3
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(C) P-3, Q-4, R-1, S-2 (D) P-4, Q-1, R-3, S-2Firstranker's choice
GATE 2018
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Q.39 The reaction
muscovite + quartz = K-feldspar + sillimanite + water
(A) takes place within the greenschist facies.
(B) takes place within the amphibolite facies.
(C) takes place within the eclogite facies.
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(D) takes place within the granulite facies.Q.40 Match the items listed in Group I with those in Group II.
Group I Group II
P. Diopside-tremolite-forsterite 1. Pelite (low P, high T)
Q. Talc-phengite-kyanite 2. Metabasite (low P, high T)
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R. Hornblende-cummingtonite-plagioclase 3. Calc-silicate (moderate P, T)S. Andalusite-cordierite-biotite 4. Pelite (high P, low T)
(A) P-3, Q-4, R-1, S-2 (B) P-1, Q-2, R-4, S-3
(C) P-3, Q-4, R-2, S-1 (D) P-1, Q-2, R-3, S-4
Q.41 The figure below is a schematic section showing the initial stages of development of a
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thrust fault (FF') having a typical ramp and flat geometry, with the thrust sheet beingtransported from east to west. With respect to the synform and antiform created in Stage 2,
which one of the options below is CORRECT for the next increment of movement on the
fault plane?
(A) The synform and the antiform will both move westward.
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(B) The synform will remain in position, while the antiform will grow in amplitude.(C) Both synform and antiform will grow in amplitude.
(D) The geometry will remain unchanged.
Firstranker's choice
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GATE 2018
Q.42 Which one of the following is the CORRECT chronological sequence for Iron formations?
(A) Algoma type > Superior type > Rapitan type > Minette type
(B) Superior type > Algoma type > Rapitan type > Minette type
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(C) Rapitan type > Minette type > Algoma type > Superior type(D) Algoma type > Minette type > Superior type > Rapitan type
Q.43 Assertion (a): High-temperature, low-pressure metamorphism occurs on the over-riding
plate near convergent plate margins.
Reason (r): Partial melting in the mantle wedge generates magmas that rise to form the arc.
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(A) (a) is true but (r) is false.(B) (a) is false but (r) is true.
(C) Both (a) and (r) are true and (r) is the correct reason for (a).
(D) Both (a) and (r) are true and (r) is not the correct reason for (a).
Q.44 Two coeval primary aqueous biphase fluid inclusions, X (liquid-rich) and Y (vapour-rich),
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occur in the same grain of the host mineral. Which one of the following situations mostlikely indicates boiling of the fluid?
(A) X homogenizes to liquid and Y homogenizes to vapour at different temperatures.
(B) Both homogenize to liquid(C) Both homogenize to vapour at the same temperature.
(D) X homogenizes to liquid and Y homogenizes to vapour at the same temperature.
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Q.45 During bench blasting in a quarry, 50 kg of an explosive with a yield of 5 MegaJoule/kg is
required to break 100 m³ of marble. In this case, the energy expended in breaking a unit
volume of marble in MegaNewton/m² would be ___________.
Q.46 The stretching lineation on the axial plane (S2) of a reclined fold on the S1 foliation makes
an angle of 30° with the S1/S2 intersection lineation. The rake of the stretching lineation on
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the axial plane in degrees is ___________.Q.47 A basaltic magma has an initial nickel concentration of 300 ppm. Olivine crystallizes from
this magma by equilibrium crystallization (Case I) or fractional crystallization (Case II).
Then, the absolute value of the difference between the nickel concentrations of the liquids
remaining after 25% crystallization in these two cases is ___________.
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(Use KD,Ni olivine/melt = 10).Q.48 The difference in the number of faces in forms {hkl} and {111} in the holosymmetric class
of the isometric system is ___________.
Firstranker's choice
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GATE 2018
Q.49 An inclined cylindrical confined aquifer has coefficient of permeability of 40 m/day. The
horizontal distance between two vertical wells penetrating the aquifer is 800 m. The water
surface elevations in the wells are 50 m and 45 m above a common horizontal datum. The
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absolute value of Darcy flux through the aquifer is ___________ m/day.Q.50 The mass and volume of a natural soil sample are 2.1 kg and 1×10-3 m³, respectively. When
fully dried, the mass of the soil sample becomes 2 kg without any change in volume.
Assuming the specific gravity of soil particles to be 2.5, and water density of 1000 kg/m³,
the degree of saturation of the natural soil sample is ___________ %.
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Q.51 For a granitic rock mass, joint set number (Jn) = 9, joint water reduction factor (Jw) = 1,
joint alteration number (Ja) = 1, stress reduction factor (SRF) = 1, rock quality designation
(%) = 84 and joint roughness number (Jr) = 3. The Q-value as per Barton's Q-system of
rock mass classification (year 1974) is ___________.
Q.52 A sun synchronous satellite is at an altitude of 300 km and the spectrometer makes an
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angular coverage angle of 12°. The Swath (GFOV) of the satellite is ___________ km.Q.53 The stability field boundary between two minerals A and B is linear with a positive slope
in P-T space. The molar entropy of A and B are 85.5 and 92.5 Joules K-1, respectively and
their respective molar volumes are 35.5 and 38.2 cc. The slope of the phase boundary in
P-T space is ___________ bar K-1.
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Q.54 Five moles of gas A (volume V1) and 3 moles of gas B (volume V2) were kept in separate
containers. These two gases are completely transferred to a new container of volume V.
Assuming isothermal condition, and that the work done is only mechanical, the entropy
change of the system is ___________ Joules K-1. (R = 8.3 J K-1 mole-1)
Q.55 The value of Eh corresponding to the upper limit of natural surface aqueous environment at
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pH of 8.0 is ___________ V.Firstranker's choice
GATE 2018
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PART B (SECTION 2): FOR GEOPHYSICS CANDIDATES ONLY
Q. 56 – Q. 85 carry two marks each.
Q.56 The maximum number of linearly independent rows of an m × n matrix G where m > n is
(A) m. (B) n.
(C) m – n. (D) 0.
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Q.57 The impulse response of the Kirchhoff pre-stack time migration operator for non-zero
offsets in a homogeneous and isotropic medium is
(A) a circle. (B) a parabola.
(C) a hyperbola. (D) an ellipse.
Q.58 A solution to the eikonal equation |?t| = 1/vo for a homogeneous and isotropic medium
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in cartesian coordinates is(?) t = v(x2+y2+z2)/vo (?) t = z/vo (C) t = (x+y+z)/vo (D) t = xyz/Vo
Q.59 The formula for the 'forward' Fourier transform is F(?) = ? f(t) e-i?t dt and that for
the 'inverse' Fourier transform is f(t) = ? F(?) ei?t d?. Then, the forward Fourier
transform of the function F(?) = ?-2? is
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(A) 2d(t). (?) d(2t). (C) d(t + 2). (D) d(t - 2).Q.60 Which one of the following rock types has the highest bulk magnetic susceptibility value?
(A) Gabbro
(B) Marble
(C) Orthoquartzite
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(D) LimestoneFirstranker's choice
GATE 2018
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Q.61 Figure 1 is a schematic diagram of four seismic events in t-x (time-offset) domain and
Figure 2 is the result of transformation from t-x domain to f-kx (frequency-horizontal
wavenumber) domain. Match the events in t-x domain in Figure 1 with their counterparts in
f-kx domain in Figure 2.
(A) P-1; Q-2; R-3; S-4
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(C) P-4; Q-3; R-2; S-1(B) P-1; Q-3; R-2; S-4
(D) P-4; Q-2; R-3; S-1
Q.62 There is a change in the values of the bulk modulus and density across the Gutenberg
discontinuity (from mantle to outer core). Which one of the following statements is
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CORRECT?(A) Both bulk modulus and density increase.
(B) Both bulk modulus and density decrease.
(C) Bulk modulus decreases and density increases.
(D) Bulk modulus increases and density decreases.
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Firstranker's choice
GATE 2018
Q.63 Multi-electrode resistivity survey is carried out by placing 10 equispaced electrodes
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(denoted by arrows in the figure below) on the surface of the earth. The points ofobservations in the distance-apparent depth plane are marked as solid dots in the figure
shown below. Considering the mid-point of the 4-electrode array as the point of
observation in the lateral direction, identify the CORRECT electrode configuration used for
the survey.
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(A) Multi-electrode Wenner array.
(B) Multi-electrode Axial Dipole-dipole array.
(C) Multi-electrode Wenner-Schlumberger array.
(D) Multi-electrode Axial Pole-dipole array.
Q.64 Match the Electromagnetic methods in Group I with the corresponding quantity measured
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by them given in Group II.Group I Group II
P. AFMAG method 1. Decay of secondary field
Q. Time domain EM method 2. Real and imaginary components
R. TURAM method 3. Dip angle
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S. Slingram method 4. Amplitude ratio and phase difference5. Ellipticity of polarization ellipse
(A) P-3, Q-2, R-4, S-5 (B) P-2, Q-1, R-4, S-3
(C) P-3, Q-1, R-4, S-2 (D) P-1, Q-2, R-5, S-3
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Firstranker's choice
GATE 2018
Q.65 Dip angle electromagnetic response measured along a profile over multiple conductors is
shown in the figure below. Which of the crossover points P, Q and R represent the
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CORRECT locations of conductors beneath them?(A) P, Q and R
(B) Q and R
(C) P and R
(D) P and Q
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Q.66 The effect of small scale near surface inhomogeneities can be removed from magnetic data
by
(A) upward continuation.
(B) downward continuation.
(C) second vertical derivative.
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(D) reduction to pole.Q.67 The frequencies of the primary magnetic field generated by worldwide thunderstorm
activity vary in the range
(A) 10-6 Hz-10-3 Hz
(C) 1 Hz-103 Hz
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(B) 10-3 Hz-1 Hz(D) 103 Hz-106 Hz
Q.68 Assertion (a): The Static Self-Potential for a thick, clean freshwater bearing sandstone
formation is positive.
Reason(r): Resistivity of the formation water is less than the resistivity of salt water mud-
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filtrate.(A) Both (a) and (r) are true and (r) is the correct reason for (a).
(B) Both (a) and (r) are true and (r) is not the correct reason for (a)
(C) Both (a) and (r) are false.
(D) (a) is true but (r) is false.
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Firstranker's choice
GATE 2018
Q.69 Which one of the following well log responses characterizes an overpressured zone in the
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subsurface?(A) High velocity and high resistivity.
(B) Low velocity and low density.
(C) High velocity and low resistivity.
(D) Low velocity and high density.
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Q.70 The angle of inclination of the remanent magnetization measured on a basalt flow at a
location P (28°N 85°E) is 40°. The palaeomagnetic latitude of the basalt flow is ___________ °N.
Q.71 Using the Gutenberg-Richter recurrence relationship, the mean annual rate of exceedance
of earthquake occurrence in a seismic belt is 0.3 per year for an earthquake of magnitude
6.0. The return period for an earthquake of magnitude 6.0 in this belt is ___________ years.
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Q.72 In the figure below, Z denotes the depth to the center of a buried sphere from the surface
and X1/2 denotes the half-width of the profile at half the maximum value of gravity. Then,
the ratio Z/X1/2 is ___________.
Q.73 Two survey vessels with shipborne gravimeters are cruising towards each other at a speed
of ___________.
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This download link is referred from the post: GATE Previous Last 10 Years 2010-2020 Question Papers With Solutions And Answer Keys
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