GATE Geology and Geophysics Practice Quiz

Question 1

In a normally consolidated clay layer, the coefficient of consolidation is commonly obtained from an oedometer test. If the drainage path is reduced to half while all other parameters remain unchanged, the time required to reach the same degree of consolidation will be

Accepted Answer

reduced to $\frac{1}{4}$ of the original time

Question 2

Which one of the following minerals is most diagnostic of greenschist facies metamorphism?

Accepted Answer

Chlorite

Question 3

A P-wave travels through a homogeneous isotropic medium with bulk modulus $K$, shear modulus $\mu$, and density $\rho$. Its velocity is given by

Accepted Answer

$V_P = \sqrt{\frac{K + \frac{4}{3}\mu}{\rho}}$

Question 4

A sandstone bed strikes $090^\circ$ and dips $30^\circ$ due south. A vertical borehole intersects the top of the bed at $100\,\mathrm{m}$ depth and the bottom at $160\,\mathrm{m}$ depth. The true thickness of the bed is

Accepted Answer

$52\,\mathrm{m}$

Question 5

In electrical resistivity prospecting using a Schlumberger array, the apparent resistivity for current electrode half-spacing $AB/2$ and potential electrode half-spacing $MN/2$, with measured resistance $R = \frac{\Delta V}{I}$, is most nearly expressed as

Accepted Answer

$\rho_a = \pi R\frac{\left(AB/2\right)^2 - \left(MN/2\right)^2}{MN}$

GATE Geology and Geophysics

Practice Quizzes

GATE Geology and Geophysics Practice Quiz

Miller Indices and Crystal Systems Fundamentals | GATE Geology and Geophysics