UPSC Geo-Scientist Prelims 2026 Paper II Geophysics Question Paper (08-Feb-2026)

Question 1

The geophysical methods used for investigating the shallow features of the Earth's crust are

Accepted Answer

static and dynamic methods both

Answer

static methods only

Answer

dynamic methods only

Answer

relaxation methods only

Question 2

The units of magnetic field strength and magnetic flux density, respectively are

Accepted Answer

ampere metre$^{-1}$ and volt second metre$^{-2}$

Answer

volt second metre$^{-2}$ and ampere metre$^{-1}$

Answer

volt second and ampere metre$^{-1}$

Answer

ampere metre$^{-1}$ and volt second

Question 3

The angle of obliquity of the Earth ranges from

Accepted Answer

$21.9^\circ$ to $24.3^\circ$

Answer

$21.1^\circ$ to $25.3^\circ$

Answer

$21.9^\circ$ to $25.3^\circ$

Answer

$21.1^\circ$ to $24.3^\circ$

Question 4

Which one of the following planets of the solar system has the highest mean orbital velocity?

Accepted Answer

Mercury

Answer

Venus

Answer

Earth

Answer

Mars

Question 5

Which one of the following relations is correct among the radius of sphere, $R$, and equatorial and polar radii of the international reference of ellipsoid, $a$ and $c$, respectively, if the volumes of the sphere and ellipsoid are equal?

Accepted Answer

$R-c=2(a – R)$

Answer

$R-c \approx \frac{a-R}{2}$

Answer

$R-c=a-R$

Answer

$R-c \approx 4(a-R)$