GATE 2024 Geophysics Question Paper PDF is available here. IISc Banglore conducted GATE 2024 Geophysics exam on February 4 in the Forenoon Session from 9:30 AM to 12:30 PM. Students have to answer 65 questions in GATE 2024 Geophysics Question Paper carrying a total weightage of 100 marks. 10 questions are from the General Aptitude section and 55 questions are from Core Discipline.
GATE 2024 Geophysics Question Paper with Answer Key PDF
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GATE Geology & Geophysics - Geophysics (GG2) Solutions
| S.No | Question | Options | Correct Option | Solution |
|---|---|---|---|---|
| 1 | Fill in the blanks: athletics ___ the potential for a spectacle. The crowd ___ with bated breath. | (A) hold (B) waits (C) culminates (D) pivot | (D) | (i) holds, (ii) waits, (iii) culminate, (iv) pivots. From the ancient Athenian arena to modern Olympic stadiums, athletics holds the potential for a spectacle. The crowd waits with bated breath as the Olympian artist performs. Six cross-steps culminate in an abrupt stop. His body pivots like a door. |
| 2 | The Earth’s magnetic field originates from convection in which one of the following layers? | (A) Inner core (B) Outer core (C) Lithosphere (D) Asthenosphere | (B) | The Earth's magnetic field is produced by electric currents from convection in the outer core. |
| 3 | Which logging tool is used to measure the diameter of a borehole? | (A) Sonic (B) Density (C) Neutron (D) Caliper | (D) | A caliper log measures the diameter of a borehole, detecting variations indicating cavities or cracks. |
| 4 | Which one of the following is an ultramafic rock? | (A) Granite (B) Gabbro (C) Dunite (D) Basalt | (C) | Dunite is an ultramafic rock, primarily composed of olivine. |
| 5 | Gold is being produced from which one of the following mines in India? | (A) Baula (B) Hutti (C) Dariba (D) Jaduguda | (B) | Hutti Gold Mines in Karnataka is one of the largest sources of gold production in India. |
| 6 | Calculate Young’s modulus of granite given σ = 200 MPa and ε = 0.005. | - | 40 GPa | E=ϵσ=0.005200×106 Pa=40 GPa. |
| 19 | Match the geophysical methods with their associated physical properties. | (A) P-3, Q-4, R-2, S-1 (B) P-3, Q-4, R-1, S-2 (C) P-4, Q-3, R-2, S-1 (D) P-2, Q-1, R-4, S-3 | (A) | (P) Magnetic - Susceptibility (3), (Q) Gravity - Density (4), (R) Magnetotelluric - Electrical conductivity (2), (S) Induced Polarization - Chargeability (1). |
| 21 | Which Epochs belong to the Quaternary Period? | (A) Holocene (B) Pleistocene (C) Pliocene (D) Miocene | (A), (B) | The Quaternary Period includes the Holocene and Pleistocene epochs. |
| 22 | Which minerals show an Oratio of 4:1? | (A) Olivine (B) Quartz (C) Diopside (D) Albite | (A) | Olivine has an Oratio of 4:1, whereas quartz has a ratio of 2:1. |
| 23 | Which rock structures are folds? | (A) Antiform (B) Horst (C) Syncline (D) Synform | (A), (C), (D) | Antiform and Syncline are fold structures; Horst is not, and "synform" is not typically used. |
| 24 | Calculate the radiogenic heat production in a crustal layer. | - | 2 μW/m³ | A=16,000 m(54−22) mW/m2=0.000002 mW/m3=2 μW/m3. |
| 25 | Calculate the transmissivity of a confined aquifer. | - | 86.4 m²/day | T=K×b=8.64 m/day×10 m=86.4 m2/day. |
| 26 | Find the electric field (E) in a cylindrical rod. | - | 50 V/m | J=AI=4m22A=0.5A/m2 and E=J⋅ρ=0.5A/m2⋅100Ω⋅m=50V/m. |
| 27 | With increasing depth, the P-wave velocity shows a significant decrease across which boundary? | (A) crust – mantle (B) mantle – outer core (C) outer core – inner core (D) upper mantle – lower mantle | (B) | A significant decrease in P-wave velocity occurs at the mantle-outer core boundary, known as the core-mantle boundary. |
| 28 | The fold of a 2D seismic survey is defined as the maximum number of traces in which gather? | (A) Common midpoint gather (B) Common offset gather (C) Common shot gather (D) Common receiver gather | (A) | A fold in a 2D seismic survey is determined by the common midpoint gather, where seismic traces sample a given subsurface location multiple times. |
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