GATE GG-1 purpose:exam-prep PYQs & Answers — Page 38

Questions 371–380 of 650. Imported answers require independent review unless marked reviewed.

There are indications of presence of a massive tabular multimetal sulfide ore body at a shallow depth from the surface. Which of the following would be the most efficient geophysical method to confirm the presence of the ore body?

Your answerChoose one option.

resistivity sounding

ground geomagnetic survey

self-potential method of geophysical prospecting

ground gravity survey

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The following reaction takes place in the amphibole grade of metamorphism of pelitic rocks:

kyanite + chlorite ⇔ staurolite + quartz + H₂O

Which of the following is a CORRECT statement on this reaction?

Your answerChoose one option.

The reaction can be represented as a sharp univariant boundary.

Initially chlorite and staurolite are Fe-rich and will gradually become Mg-rich with increasing temperature.

With increasing temperature chlorite becomes Mg-rich and staurolite becomes Fe-rich.

The reaction is independent of fugacity of H₂O.

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Match the items in Group-I with corresponding appropriate items in Group-II.

Group-I P. Cs Q. Au R. Cd S. Rn

Group-II

Siderophile

Chalcophile

Atmophile

Lithophile

Your answerChoose one option.

P-4, Q-1, R-2, S-3

P-4, Q-3, R-1, S-2

P-3, Q-1, R-2, S-4

P-2, Q-1, R-4, S-3

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The symmetry elements of a point group are: 3 crystallographic axes of 2-fold symmetry and 3 mirror planes perpendicular to the crystallographic axes. The Hermann – Mauguin notation of the point group is:

Your answerChoose one option.

2m2m2m

2mm

2/m2/m2/m

2/m

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An aqueous polyphase (L + V + solid) inclusion contains a halite daughter crystal at room temperature and pressure. Which of the given statements is CORRECT in relation to this inclusion?

Your answerChoose one option.

The salinity of the bulk aqueous fluid can be determined from the temperature of melting of ice.

The salinity of the bulk aqueous fluid can be determined from the temperature of dissolution of halite.

The density in all cases can be determined from the temperature of liquid-vapor homogenization.

The density in all cases can be determined from the temperature of dissolution of the halite daughter crystal.

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Match the rock types in Group-I with their most likely corresponding lithospheric / tectonic settings of formation in Group-II

Group-I P. Boninite Q. Lamproite R. Phonolite S. Leucogranite

Group-II

Continental anorogenic

Island-arc

Continental collision

Intraplate oceanic

Your answerChoose one option.

P-1, Q-3, R-4, S-2

P-2, Q-4, R-1, S-3

P-2, Q-1, R-4, S-3

P-3, Q-2, R-4, S-1

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A mantle source rock melts at a time t₀ giving rise to melt (M) and residue (R). Which of the following statements is CORRECT about evolution of the (ⁱ⁴³Nd/ⁱ⁴⁴Nd) and (⁸⁷Sr/⁸⁶Sr) isotope ratio in M (that crystallized to form a rock) and R?

Your answerChoose one option.

The growth of Nd isotope ratio versus time is faster in R than M and the Sr isotope ratio grows slower in R than M.

The growth of Nd isotope ratio versus time is slower in R than M and the Sr isotope ratio grows faster in R than M.

Both the Nd and Sr isotope ratios grow at identical rates in R and M.

The growth of Nd and Sr isotope ratio in M and R would depend on the initial concentrations of Sm and Rb in the mantle source rock.

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The mole percentages of SiO₂, Al₂O₃ and K₂O in a granitic rock are 84.21, 7.89 and 7.89, respectively. The molar proportion (in %) of K-feldspar in the rock is ______. [round off to one decimal place]

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In a zone of active normal faulting, the maximum and minimum in situ principal stresses (compressive in nature) are 30 MPa (s₁) and 10 MPa (s₃), respectively. The fault plane striking N-S has a dip amount of 60° towards E. Considering Anderson theory of faulting and using the given information, the calculated normal stress on the fault plane is ______ MPa. [in integer]

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A circular tunnel is being excavated in a blocky rock mass by drilling and blasting. An excavation disturbed zone (EDZ) around the tunnel extends 0.70 m into the rock from the excavation surface. Considering the unit weight of the rock as 25 kN/m³, the support pressure required at the crown of the tunnel to stabilize the loose blocks of the EDZ is ______ kPa. [round off to one decimal place]

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GATE GG-1 purpose:exam-prep PYQs

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