CUET PG 2025 Geophysics Question Paper (Apr 01, 2025) (Shift-2)

Question 1

Which of following Maxwell's equation shows non existence of magnetic monopoles?

Accepted Answer

$\vec \nabla .  \vec{B}$ = 0

Answer

$ \vec 
abla .  \vec{E} = \frac{ho}{\epsilon_0} $

Answer

$ \vec 
abla .  \vec{E} = 0 $

Answer

$ \vec 
abla 	imes  \vec{E}    = -\frac{\partial  \vec B}{\partial t} $

Question 2

A long coaxial cable carries current 'I' (current flows down the surface of inner cylinder of radius '$r_1$' and back along the outer cylinder of radius '$r_2$'). The magnetic energy stored in a section of length 'L' is

Accepted Answer

$ \frac{\mu_0}{4\pi} I^2 L \ln \left(\frac{r_1}{r_2}\right) $

Answer

$ \frac{\mu_0}{4\pi} I^2 L \ln \left(\frac{r_2}{r_1}\right) $

Answer

$ \frac{\mu_0}{4\pi} I L \ln \left(\frac{r_2}{r_1}\right) $

Answer

$ \frac{\epsilon_0}{4\pi} I^2 L \ln \left(\frac{r_2}{r_1}\right) $

Question 3

The magnetic polarization results in a bound current $J_b$(A) which is associated with magnetization of the material.(B) which involves spin and orbital motion of electrons.(C) which is the result of linear motion of charge when electric polarization changes.(D) which is given by $ \vec 
abla  	imes \vec M $ (where $\vec M$ is magnetization).Choose the correct answer from the options given below:

Accepted Answer

(A), (B) and (D) only

Answer

(A), (B) and (C) only

Answer

(A), (C) and (D) only

Answer

(B), (C) and (D) only

Question 4

Match List-I with List-II List-IList-II(A) Displacement current ($ \vec J_d$)(I) $ \frac{1}{2} \epsilon_0 \int E^2 dt $(B) Poynting vector(II) $\vec 
abla \cdot \vec E = \frac{ho}{\epsilon_0} $(C) Energy stored in electric field ($\vec E$)(III) $ \frac{1}{\mu_0} (\vec E 	imes \vec B) $(D) Gauss's Law(IV) $ \epsilon_0 \frac{\partial \vec E}{\partial t} $Choose the correct answer from the options given below:

Accepted Answer

(A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Answer

(A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Answer

(A) - (I), (B) - (II), (C) - (III), (D) - (IV)

Answer

(A) - (IV), (B) - (III), (C) - (II), (D) - (I)

Question 5

At a temperature of 47°C the thermal voltage is (Given value of Boltzmann's constant = $1.38 	imes 10^{-23}$ joule/°K):

Accepted Answer

27.6 mV

Answer

27.6 V

Answer

27.6 $ \mu V $

Answer

2.76 V

CUET PG 2025 Geophysics Question Paper (Apr 01, 2025) (Shift-2)

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List-I	List-II
(A) Displacement current ($ \vec J_d$)	(I) $ \frac{1}{2} \epsilon_0 \int E^2 dt $
(B) Poynting vector	(II) $\vec \nabla \cdot \vec E = \frac{\rho}{\epsilon_0} $
(C) Energy stored in electric field ($\vec E$)	(III) $ \frac{1}{\mu_0} (\vec E \times \vec B) $
(D) Gauss's Law	(IV) $ \epsilon_0 \frac{\partial \vec E}{\partial t} $