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Delhi University Entrance Test (DUET) 2020 Previous Year Question Paper With Answer Key

DU MPhil PhD in Geology
Topic: GEO MPHIL S2
1) Why do conjugate faults show opposite senses of slip?
Select the correct explanation from below:
[Question ID = 2153]
1. Orientation of stress axes ( ,
1
, and
2
) are opposite for the two conjugate fault planes
3
[Option ID = 8606]
2. becomes vertical for one of the two conjugate planes
2
[Option ID = 8607]
3. both the fault planes are oriented symmetrically with respect to , but in opposite sense
1
[Option ID = 8608]
4. and
1
axes swap their position after some amount of deformation
2
[Option ID = 8609]
Correct Answer :
both the fault planes are oriented symmetrically with respect to , but in opposite sense
1
[Option ID = 8608]
2) In simple shear, the angle between the longest ( ) axis of the finite strain ellipsoid and the shear direction () varies
1
with the amount of shear strain () according to which of the following relationships?
[Question ID = 2154]
1. increases as increases
[Option ID = 8610]
2. decreases as increases
[Option ID = 8611]
3. remains constant as increases
[Option ID = 8612]
4. these two parameters have no predictable relationship
[Option ID = 8613]
Correct Answer :
decreases as increases
[Option ID = 8611]
3) In a multilayered rock, the viscosity ratio of the competent and incompetent layers ( /
1
) is high and the packing
2
distance between layers (n) is low. What is the most likely structure that will develop in such a system under layerparallel
shortening?
[Question ID = 2155]
1. Kink fold
[Option ID = 8614]
2. Cuspatelobate fold
[Option ID = 8615]
3. Ptygmatic fold
[Option ID = 8616]
4. no folding ? only homogeneous thickening of layers
[Option ID = 8617]
Correct Answer :
Kink fold
[Option ID = 8614]
4) Brittle deformation of rocks is favoured at a shallow depth, whereas ductile flow takes place at greater depth because
[Question ID = 2156]
1. brittle deformation of rocks leads to increase in volume [Option ID = 8618]
2. ductile deformation is favoured only in rocks with smaller grain size [Option ID = 8619]
3. ductile deformation can take place only in presence of a fluid phase [Option ID = 8620]

---

4. brittle deformation can occur only at high temperature [Option ID = 8621]
Correct Answer :
brittle deformation of rocks leads to increase in volume [Option ID = 8618]
5) Which of the following shows a correct sequence of recrystallization mechanism in quartz with increasing temperature?
[Question ID = 2157]
1. Subgrain Rotation ? Bulging ? Grain Boundary Migration
[Option ID = 8622]
2. Bulging ? Grain Boundary Migration ? Subgrain Rotation
[Option ID = 8623]
3. Bulging ? Subgrain Rotation ? Grain Boundary Migration
[Option ID = 8624]
4. None of these
[Option ID = 8625]
Correct Answer :
Bulging ? Subgrain Rotation ? Grain Boundary Migration
[Option ID = 8624]
6) Trapezoid shaped boudins are characteristically found in
[Question ID = 2158]
1. extension fracture boudinage [Option ID = 8626]
2. symmetric shear fracture boudinage [Option ID = 8627]
3. asymmetric shear fracture boudinage [Option ID = 8628]
4. postboudinage deformation [Option ID = 8629]
Correct Answer :
symmetric shear fracture boudinage [Option ID = 8627]
7) If, in a folded layered sequence, thinner layers show smaller folds and thicker layers show larger folds, the fold structure
will be called:
[Question ID = 2159]
1. disharmonic fold [Option ID = 8630]
2. arrowhead fold [Option ID = 8631]
3. polyclinal fold [Option ID = 8632]
4. fan fold [Option ID = 8633]
Correct Answer :
disharmonic fold [Option ID = 8630]
8) Geostrophic currents
[Question ID = 2160]
1. flow inside the mantle [Option ID = 8634]
2. are controlled by a balance between pressure gradient force and Coriolis deflection [Option ID = 8635]
3. are controlled by ocean's tropic levels [Option ID = 8636]
4. generated due to tidal action of moon [Option ID = 8637]
Correct Answer :
are controlled by a balance between pressure gradient force and Coriolis deflection [Option ID = 8635]
9) Porosity of a formation is summation of:
[Question ID = 2161]
1. Hydraulic conductivity and Transimissivity [Option ID = 8638]
2. Specific storage and Specific retention [Option ID = 8639]
3. Specific retention and Specific yield [Option ID = 8640]
4. Hydraulic conductivity & Transmissivity [Option ID = 8641]
Correct Answer :
Specific retention and Specific yield [Option ID = 8640]
10) Conodonts are useful microfossils in the biostratigraphic subdivision of
[Question ID = 2162]
1. Archean [Option ID = 8642]
2. Cenozoic [Option ID = 8643]
3. Cretaceous [Option ID = 8644]
4. Paleozoic [Option ID = 8645]
Correct Answer :
Paleozoic [Option ID = 8645]

---

11) O of Mixed layer planktic foraminiferal test formed during a glacial period would be
18
[Question ID = 2163]
1. Higher compared to that formed during interglacial period
[Option ID = 8646]
2. Equal to that of formed during interglacial period
[Option ID = 8647]
3. Lower compared to that formed during interglacial period
[Option ID = 8648]
4. None of these
[Option ID = 8649]
Correct Answer :
Higher compared to that formed during interglacial period
[Option ID = 8646]
12) Why was Paleomagnetism so important in discovering plate tectonics?
[Question ID = 2164]
1. it illustrated the location of the North Pole [Option ID = 8650]
2. It illustrated sea floor spreading [Option ID = 8651]
3. it allowed measurement of mountain building rates [Option ID = 8652]
4. It allowed the depth of the oceans to be measured [Option ID = 8653]
Correct Answer :
It illustrated sea floor spreading [Option ID = 8651]
13) A polar wandering curve:
[Question ID = 2165]
1. shows that the magnetic poles wandered relative to fixed continents [Option ID = 8654]
2. shows that the rotational poles wandered to fixed continents [Option ID = 8655]
3. shows that the continents wandered relative to generallyfixed pole positions [Option ID = 8656]
4. is a graph of the Mercalli Index [Option ID = 8657]
Correct Answer :
shows that the continents wandered relative to generallyfixed pole positions [Option ID = 8656]
14) The 'Lehmann discontinuity' in the Earth is identified by
[Question ID = 2166]
1. 56% decrease in P and S wave velocity [Option ID = 8658]
2. 34% increase in P and S wave velocity [Option ID = 8659]
3. 5% decrease in density [Option ID = 8660]
4. 5% increase in S wave velocity [Option ID = 8661]
Correct Answer :
34% increase in P and S wave velocity [Option ID = 8659]
15) Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Assemblage zones are not good for intercontinental correlation.
Reason R : They are very much environmentally controlled.
In light of the above statements, choose the correct answer from the options given below
[Question ID = 2167]
1. R explains A [Option ID = 8662]
2. R does not explain A [Option ID = 8663]
3. A and R are false [Option ID = 8664]
4. R is false [Option ID = 8665]
Correct Answer :
R does not explain A [Option ID = 8663]
16) In steady state/equilibrium groundwater flow situation, the water table head during pumping:
[Question ID = 2168]
1. Does not change with time [Option ID = 8666]
2. Changes with time [Option ID = 8667]
3. Changes without time [Option ID = 8668]
4. Remains constant [Option ID = 8669]
Correct Answer :
Does not change with time [Option ID = 8666]

---

17) In unconfined aquifer Storage coefficient is approximately equal to:
[Question ID = 2169]
1. Conductivity [Option ID = 8670]
2. Intrinsic permeability [Option ID = 8671]
3. Specific retention [Option ID = 8672]
4. Specific yield [Option ID = 8673]
Correct Answer :
Specific yield [Option ID = 8673]
18) Preservation of fossils represent
[Question ID = 2170]
1. Stagnation deposits [Option ID = 8674]
2. Obrution deposits [Option ID = 8675]
3. Concentration deposits [Option ID = 8676]
4. Conservation traps [Option ID = 8677]
Correct Answer :
Conservation traps [Option ID = 8677]
19) Which of this typically represents elastic scattering?
[Question ID = 2171]
1. Backscattered electrons [Option ID = 8678]
2. Auger electrons [Option ID = 8679]
3. Secondary electrons [Option ID = 8680]
4. Heating caused by electron beammatter interaction [Option ID = 8681]
Correct Answer :
Backscattered electrons [Option ID = 8678]
20) Inphase diffraction of any electromagnetic wave by a regularly spaced grating is
[Question ID = 2172]
1. Reciprocal and normal [Option ID = 8682]
2. Only reciprocal [Option ID = 8683]
3. Only normal [Option ID = 8684]
4. Destructive interference [Option ID = 8685]
Correct Answer :
Reciprocal and normal [Option ID = 8682]
21) Relationship between energy of characteristic Xray and atomic number is defined by
[Question ID = 2173]
1. Mosely's Law [Option ID = 8686]
2. Steno's Law [Option ID = 8687]
3. Beers Law [Option ID = 8688]
4. Harper's Index [Option ID = 8689]
Correct Answer :
Mosely's Law [Option ID = 8686]
22) This cannot provide the width of distribution around a central tendency of any dataset
[Question ID = 2174]
1. Arithmetic average [Option ID = 8690]
2. Standard deviation [Option ID = 8691]
3. Variance [Option ID = 8692]
4. Both Arithmetic average and variance [Option ID = 8693]
Correct Answer :
Arithmetic average [Option ID = 8690]
23) The value of "Hue" in the Munsell notations used for colour estimations refers to
[Question ID = 2175]
1. Red, yellow, blue colours
[Option ID = 8694]
2. Lightness of the colours
[Option ID = 8695]
3. Strength of the colours
[Option ID = 8696]
4. All of these
[Option ID = 8697]
Correct Answer :

---

Red, yellow, blue colours
[Option ID = 8694]
24) Which of the following in petrographic criteria suggests the advanced stage of pedogenic carbonate development?
[Question ID = 2176]
1. Few calcans and micrite [Option ID = 8698]
2. Nodules and calcans [Option ID = 8699]
3. Recrystallised nodules and microspars [Option ID = 8700]
4. Micrite in the groundmass [Option ID = 8701]
Correct Answer :
Recrystallised nodules and microspars [Option ID = 8700]
25) Removal of organic matter, carbonate, and free iron is required for ................... of the particles during grain size.
[Question ID = 2177]
1. Flocculation [Option ID = 8702]
2. Lithification [Option ID = 8703]
3. Dispersal [Option ID = 8704]
4. Cementation [Option ID = 8705]
Correct Answer :
Dispersal [Option ID = 8704]
26) Which of the following sediment size refers to fine clay fraction?
[Question ID = 2178]
1. < 2 mm
[Option ID = 8706]
2. <0.2 mm
[Option ID = 8707]
3. <0.2 ?m
[Option ID = 8708]
4. <2 ?m
[Option ID = 8709]
Correct Answer :
<0.2 ?m
[Option ID = 8708]
27) If a marker bed cut by a fault does not show any displacement across the fault line, the most likely reason is:
[Question ID = 2179]
1. the marker bed is later than the fault [Option ID = 8710]
2. the fault is a reverse fault [Option ID = 8711]
3. the fault is a traceslip fault [Option ID = 8712]
4. the fault slip is seismic in nature [Option ID = 8713]
Correct Answer :
the fault is a traceslip fault [Option ID = 8712]
28) To assess dislocation density in a deformed crystal, which of the following instruments is best suited?
[Question ID = 2180]
1. Electron Probe MicroAnalyzer (EPMA) [Option ID = 8714]
2. Scanning Electron Microscope (SEM) [Option ID = 8715]
3. Xray Fluorescence (XRF) [Option ID = 8716]
4. Transmission Electron Microscope (TEM) [Option ID = 8717]
Correct Answer :
Transmission Electron Microscope (TEM) [Option ID = 8717]
29) For dating a Precambrian porcellanite bed the most suitable geochronological method is
[Question ID = 2181]
1. C14 method [Option ID = 8718]
2. RbSr method [Option ID = 8719]
3. SmNd method [Option ID = 8720]
4. UPb method [Option ID = 8721]
Correct Answer :
UPb method [Option ID = 8721]
30) Marine carbonate cement precipitated during glacial period will show
[Question ID = 2182]

---

1. High C signature
12
[Option ID = 8722]
2. High C signature
13
[Option ID = 8723]
3. High O signature
18
[Option ID = 8724]
4. Low O signature
18
[Option ID = 8725]
Correct Answer :
High O signature
18
[Option ID = 8724]
31) Wavelengths of electron beam in SEM is typically
[Question ID = 2183]
1. Few picometers to few tens of picometers [Option ID = 8726]
2. Few nanometers [Option ID = 8727]
3. Few hundreds of nanometers [Option ID = 8728]
4. Few tens of nanometers [Option ID = 8729]
Correct Answer :
Few picometers to few tens of picometers [Option ID = 8726]
32) ZAF correction in EPMA refers to
[Question ID = 2184]
1. Fluorescence, atomic number and absorption correction
[Option ID = 8730]
2. Atomic number, thickness and fluorescence correction
[Option ID = 8731]
3. Atomic number, absorption and frequency correction
[Option ID = 8732]
4. None of these
[Option ID = 8733]
Correct Answer :
Fluorescence, atomic number and absorption correction
[Option ID = 8730]
33) Relationship between the incident angle and the diffraction angle in an Xray diffraction instrument is
[Question ID = 2185]
1. Incident angle is twice the diffraction angle [Option ID = 8734]
2. Both are equal [Option ID = 8735]
3. Incident angle is half of the diffraction angle [Option ID = 8736]
4. Diffraction angle is half of incident angle [Option ID = 8737]
Correct Answer :
Incident angle is half of the diffraction angle [Option ID = 8736]
34) Halophytes are the plants that are indicative of
[Question ID = 2186]
1. Saline deposits [Option ID = 8738]
2. Fresh water deposits [Option ID = 8739]
3. Hydrocarbons [Option ID = 8740]
4. Nonmetallic ores [Option ID = 8741]
Correct Answer :
Saline deposits [Option ID = 8738]
35) Which of the following parameters is considered to determine the reflectance of a vegetation canopy?
[Question ID = 2187]
1. Chlorophyll content
[Option ID = 8742]
2. Azimuth angle
[Option ID = 8743]
3. Solar Zenith angle
[Option ID = 8744]
4. All of these
[Option ID = 8745]
Correct Answer :
All of these
[Option ID = 8745]

---

36) In a collisional orogen, the foldthrust belts occur:
[Question ID = 2188]
1. along the margins of the orogen, where rocks undergo thrusting above a detachment [Option ID = 8746]
2. in the internal part where rocks have been squeezed up from great depth [Option ID = 8747]
3. in the grabens [Option ID = 8748]
4. in the horsts [Option ID = 8749]
Correct Answer :
along the margins of the orogen, where rocks undergo thrusting above a detachment [Option ID = 8746]
37) In XRD studies, persistence of the 14.4 A? peak at 550?C of the K saturated clays confirms the presence of
[Question ID = 2189]
1. Illite [Option ID = 8750]
2. Kaolinite [Option ID = 8751]
3. Smectite [Option ID = 8752]
4. Chlorite [Option ID = 8753]
Correct Answer :
Chlorite [Option ID = 8753]
38) A rapid and progressive increase of the smectite in the in the clay mineral assemblage indicates
[Question ID = 2190]
1. Change of the source rock with dominance of Feldspar [Option ID = 8754]
2. Change of the source rock with dominance of Mica [Option ID = 8755]
3. Change of the source rock with dominance of Quartz [Option ID = 8756]
4. Change of the source rock with dominance of Carbonates [Option ID = 8757]
Correct Answer :
Change of the source rock with dominance of Feldspar [Option ID = 8754]
39) The MiddleMiocene Climatic Optima at about 15 Ma is marked by
[Question ID = 2191]
1. Warming [Option ID = 8758]
2. Cooling [Option ID = 8759]
3. Extreme warming [Option ID = 8760]
4. Extreme cooling [Option ID = 8761]
Correct Answer :
Warming [Option ID = 8758]
40) The values of 5060 for the chemical index of alteration (CIA) to assess weathering of silicate rock suggest
[Question ID = 2192]
1. Advanced stage of weathering [Option ID = 8762]
2. Incipient stage of weathering [Option ID = 8763]
3. Moderate stage of weathering [Option ID = 8764]
4. Very strong weathering [Option ID = 8765]
Correct Answer :
Incipient stage of weathering [Option ID = 8763]
41) Which of the following is true during deep burial?
[Question ID = 2193]
1. Possible addition and redistribution of K [Option ID = 8766]
2. Possible addition and redistribution of Ti [Option ID = 8767]
3. Possible addition and redistribution of Al [Option ID = 8768]
4. Possible addition and redistribution of Na [Option ID = 8769]
Correct Answer :
Possible addition and redistribution of K [Option ID = 8766]
42) The meandering rivers are marked by
[Question ID = 2194]
1. Shallowest section at crossovers and the deepest section at bends [Option ID = 8770]
2. Deepest section at crossovers and the shallowest section at bends [Option ID = 8771]
3. Uniform depth at crossovers and at the bends [Option ID = 8772]
4. Deep sections both at crossovers and the bends [Option ID = 8773]
Correct Answer :
Shallowest section at crossovers and the deepest section at bends [Option ID = 8770]
43) Facies analysis of the gravel dominated braided rivers shows
[Question ID = 2195]
1. St as the main facies [Option ID = 8774]
2. Gm as the main facies [Option ID = 8775]

---

3. Ss as the main facies [Option ID = 8776]
4. Fm as the main facies [Option ID = 8777]
Correct Answer :
Gm as the main facies [Option ID = 8775]
44) The meandering rivers are characterized by
[Question ID = 2196]
1. Sinuosity >1.3 and bed load <11%
[Option ID = 8778]
2. Sinuosity <1.3 and bed load >11%
[Option ID = 8779]
3. Sinuosity >1.3 and bed load >11%
[Option ID = 8780]
4. Sinuosity <1.3 and bed load <11%
[Option ID = 8781]
Correct Answer :
Sinuosity >1.3 and bed load <11%
[Option ID = 8778]
45) In braided rivers, the width/depth ratio is ..... and the bed load is ........
[Question ID = 2197]
1. Width/Depth ratio <40 and bead load <11%
[Option ID = 8782]
2. Width/Depth ration >40 and bead load >11%
[Option ID = 8783]
3. Width/Depth ratio <40 and bead load >11%
[Option ID = 8784]
4. Width/Depth ratio > 40 and bead load <11%
[Option ID = 8785]
Correct Answer :
Width/Depth ration >40 and bead load >11%
[Option ID = 8783]
46) The longitudinal/medial bars in braided rivers occur as
[Question ID = 2198]
1. Bar deposits elongated transvers to the flow direction [Option ID = 8786]
2. Bar deposits elongated parallel to the flow directions [Option ID = 8787]
3. Bar deposits along the convex side of the of the banks [Option ID = 8788]
4. Bar deposits along the concave side of the banks [Option ID = 8789]
Correct Answer :
Bar deposits elongated parallel to the flow directions [Option ID = 8787]
47) Which of the following geophysical method is most suitable for groundwater exploration?
[Question ID = 2199]
1. Resistivity
[Option ID = 8790]
2. Magnetic
[Option ID = 8791]
3. Sonic
[Option ID = 8792]
4. Gravity
[Option ID = 8793]
Correct Answer :
Resistivity
[Option ID = 8790]
48) Theim's equation for steady state radial flow to a tubewell in confined aquifer can be used to estimate:
[Question ID = 2200]

---

1. Transmissivity only [Option ID = 8794]
2. Storativity only [Option ID = 8795]
3. Specific yield only [Option ID = 8796]
4. Both Transmissivity and Storativity [Option ID = 8797]
Correct Answer :
Transmissivity only [Option ID = 8794]
49) The major ions considered for hydrochemical facies analysis using trilinear plot are
[Question ID = 2201]
1. Sodium, Potassium, Phosphorus, Magnesium, Chloride, Sulphate, Carbonate and Nitrate [Option ID = 8798]
2. Sodium, Potassium, Calcium, Magnesium, Chloride, Sulphate, Carbonate and Bicarbonate [Option ID = 8799]
3. Arsenic, Potassium, Calcium, Lead, Fluoride, Sulphate, Carbonate and Bicarbonate [Option ID = 8800]
4. Zinc, Mercury, Calcium, Magnesium, Aluminium , Sulphate, Carbonate and Bicarbonate [Option ID = 8801]
Correct Answer :
Sodium, Potassium, Calcium, Magnesium, Chloride, Sulphate, Carbonate and Bicarbonate [Option ID = 8799]
50) Rainwater harvesting and artificial recharge to groundwater is generally done in
[Question ID = 2202]
1. Shallow groundwater level areas [Option ID = 8802]
2. In wetlands [Option ID = 8803]
3. In areas with deeper water levels, where water table is declining heavily [Option ID = 8804]
4. In areas along and close to water bodies [Option ID = 8805]
Correct Answer :
In areas with deeper water levels, where water table is declining heavily [Option ID = 8804]

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