UPSC Geo Scientist 2025 Prelims Paper II (Geophysics) Question Paper (09-Feb-2025)

Question 1

Rheology is the study of

Accepted Answer

deformation and flow of solid materials

Answer

mountain building process

Answer

deformation and flow of liquid materials and gases

Answer

gravity effect of the Sun and the Moon

Question 2

Consider the following nuclear electric quadrupole moments (Q) of the nuclei :NuclideQ (in barn)$^{133}$Cs-0.003$^{161}$Dy+2.401$^{63}$Cu-0.209    Which one of the following statements regarding the shape of these nuclei is correct?

Accepted Answer

$^{63}$Cu is oblate, $^{133}$Cs is near spherical and $^{161}$Dy is prolate.

Answer

$^{63}$Cu is prolate, $^{133}$Cs is near spherical and $^{161}$Dy is oblate.

Answer

$^{63}$Cu and $^{133}$Cs are prolate and $^{161}$Dy is oblate.

Answer

$^{63}$Cu and $^{161}$Dy are oblate and $^{133}$Cs is prolate.

Question 3

The ratio of the nuclear magneton and Bohr magneton is

Accepted Answer

1/1836

Answer

1836

Answer

3672

Answer

1/3672

Question 4

Which one of the following has maximum binding energy per nucleon?

Accepted Answer

$^{58}_{28}$Ni

Answer

$^4$He

Answer

$^{12}$C

Answer

$^{208}_{82}$Pb

Question 5

A heavy nucleus goes to spontaneous symmetric fission. The energy released using the Bethe-Weizsäcker mass formula (neglecting pairing term) is given by

Accepted Answer

$\alpha_s A^{2/3}(1-2^{1/3})+a_c \frac{Z^2}{A^{1/3}}(1-2^{-2/3})$

Answer

$\alpha_s A^{2/3}(1+2^{1/3})+a_c \frac{Z^2}{A^{1/3}}(1-2^{2/3})$

Answer

$\alpha_s A^{2/3}(1+2^{1/3})+a_c \frac{Z^2}{A^{1/3}}(1+2^{-2/3})$

Answer

$\alpha_s A^{2/3}(1-2^{1/3}) + a_c \frac{Z^2}{A^{1/3}}(1-2^{2/3})$

Nuclide	Q (in barn)
$^{133}$Cs	-0.003
$^{161}$Dy	+2.401
$^{63}$Cu	-0.209