List of top Questions asked in GATE Geology and Geophysics- 2025

What is/are the primary effect(s) of applying upward continuation to magnetic field data?

The following figure shows a region in which rocks in areas A, B and C follow Hooke's law and are subject to the same stress. B exhibits lower strain than both A and C. What can we infer about the nature of B?


 

The following figure shows the GPS data at two stations located near each other at the same latitude. Station A is moving towards the west while station B is moving towards the east. Which one of the following options is correct?


 

In the schematic, line P shows a 1-D geothermal profile. If the heat flow at the base of the mantle increases, which line will reflect the new geothermal profile?


 

In a gravity survey that is being carried out in the vicinity of a large mountain, it was observed that the deflection of the plumb line from the vertical is less than what is calculated using the visible mountain mass. Which one of the inferences about the mountain is correct?
Which one of the options is correct about \( \beta^- \) decay?
Which one of the following factors leads to an abrupt increase in density at the mantle–outer core boundary?
If a planet is made of uniform density material and has no topography, then which one of the following statements is correct?
Which one of the following options is the primary contributor to the International Geomagnetic Reference Field?
Diurnal correction in magnetic survey data accounts for:
Which one of these statements is NOT correct for electromagnetic waves travelling through the subsurface?
In resistivity measurements for a double-dipole system, the apparent resistivity is NOT affected by:
A scalar potential \( \psi \) of a vector field \( \vec{F} \) satisfies the Laplace equation \( \nabla^2 \psi = 0 \) in free space. \( \psi \) can be uniquely determined at any point inside the closed surface \( S \) using:
Consider the acceleration due to gravity \( g' \) at an altitude \( h \) of 50 km above the Earth's surface. If \( R \) is the radius of the Earth, and the acceleration due to gravity measured at the surface is \( g \), the ratio of \( \frac{g'}{g} \) is ________. (Assume \( h \ll R \), \( R = 6370 \, {km} \), and round off to two decimal places.)
Consider a geophysical inverse problem of the form \( \mathbf{d} = \mathbf{G} \mathbf{m} \), where \( \mathbf{G} \) is the forward operator, \( \mathbf{m} \) is the model vector and \( \mathbf{d} \) is the observed data vector. The Earth model parameters can be estimated using \( \mathbf{m}_{{est}} = \mathbf{H} \mathbf{d} \), where \( \mathbf{H} \) is the pseudoinverse of \( \mathbf{G} \). Given \( \mathbf{G} = \mathbf{U} \Sigma \mathbf{V}^T \) as the singular value decomposition of \( \mathbf{G} \), and assuming \( \mathbf{G} \) is full rank, which of the following options is/are correct?
Half-life of \(^{14}C\) is 5730 years. Suppose we start with 1 billion \(^{14}C\) atoms, and after a certain interval of time only 125 million \(^{14}C\) atoms remain, the number of half-lives that has elapsed is ________ (Answer in integer).
When an external magnetic field of strength \(1.5 \times 10^{-3}\) A/m is applied to a rock sample, the measured intensity of magnetization is \(0.5 \times 10^{-3}\) A/m. The magnetic susceptibility of this rock is ________ (Round off to two decimal places).
F denotes force, A denotes area, L denotes length, and \( \Delta L \) is the change in length due to the applied force. Assuming linear elasticity, select a relationship where the constant of proportionality is a material property independent of the dimensions of the body.
The working of the proton-precession magnetometer is based on:

The following table provides the mineral chemistry of a garnet. All oxides are in weight percentage and cations in atoms per formula unit. Total oxygen is taken as 12 based on the ideal garnet formula. Consider Fe as Fetotal and Fe\(^{3+}\) = 0. The Xpyrope of this garnet is _.


 

230Th and 226Ra are intermediate nuclides in the decay series of 238U to 206Pb. The half-lives of 238U, 230Th, and 226Ra are 4.47 billion years, 75,000 years, and 1600 years, respectively. At secular equilibrium, when activities are equal, 10 billion atoms of 238U are present. The number of atoms of 226Ra present at equilibrium is ________

In the isochemical phase diagram shown below, the curved arrow represents the P-T path. The variance at peak metamorphism is _. 


 

A sediment core of 4 cm diameter and 35.81 cm height was collected. This core had an initial weight of 1000.00 g and upon drying the sediment, the weight decreased by 133.75 g. This core has a void ratio of 0.42857, where void ratio is defined as the ratio of volume of void to the volume of solid (Vv/Vs). The average density of the sediment in the core is ________ g/cm\(^3\).

Which of the following options can be linked to rise in CO\(_2\) concentration in the atmosphere?
Which of the following statements is/are correct for electromagnetic (EM) radiation?