JEE Main 2025 Physics Paper: 22 Jan, Shift 2

A series LCR circuit is connected to an alternating source of emf E. The current amplitude at resonant frequency is $I_0$. If the value of resistance R becomes twice of its initial value then amplitude of current at resonance will be

A tube of length 1 m is filled completely with an ideal liquid of mass 2 M, and closed at both ends. The tube is rotated uniformly in horizontal plane about one of its ends. If the force exerted by the liquid at the other end is F then angular velocity of the tube is $\sqrt{\frac{F}{\alpha M}}$ in SI unit. The value of $\alpha$ is _________.

A body of mass 100 g is moving in circular path of radius 2 m on vertical plane as shown in figure. The velocity of the body at point $A$ is $10\text{ m/s}$. The ratio of its kinetic energies at point B and C is:

(Take acceleration due to gravity as $10\text{ m/s}^2$)

The net current flowing in the given circuit is __________ A.

A light source of wavelength $\lambda$ illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV. If the same surface is illuminated by a light source of wavelength $\frac{\lambda}{2}$, then the maximum kinetic energy of ejected electrons will be (The work function of metal is 1 eV)

A rectangular metallic loop is moving out of a uniform magnetic field region to a field free region with a constant speed. When the loop is partially inside the magnetic field, the plot of magnitude of induced emf $(\varepsilon)$ with time $(t)$ is given by

A parallel plate capacitor of area $A = 16\text{ cm}^{2}$ and separation between the plates 10 cm, is charged by a DC current. Consider a hypothetical plane surface of area $\text{A}_0 = 3.2\text{ cm}^{2}$ inside the capacitor and parallel to the plates. At an instant, the current through the circuit is 6A. At the same instant the displacement current through $\text{A}_0$ is __________ mA.

For a short dipole placed at origin O, the dipole moment P is along $x$-axis, as shown in the figure. If the electric potential and electric field at $A$ are $V_0$ and $E_0$, respectively, then the correct combination of the electric potential and electric field, respectively, at point B on the $y$-axis is given by

A tube of length $L$ is shown in the figure. The radius of cross section at the point $(1)$ is 2 cm and at the point (2) is 1 cm, respectively. If the velocity of water entering at point (1) is $2\text{ m/s}$, then velocity of water leaving the point (2) will be

Two long parallel wires $X$ and $Y$, separated by a distance of 6 cm, carry currents of 5 A and 4A, respectively, in opposite directions as shown in the figure. Magnitude of the resultant magnetic field at point P at a distance of 4 cm from wire Y is $x \times 10^{-5}\text{ T}$. The value of $x$ is _________. Take permeability of free space as $\mu_0 = 4\pi \times 10^{-7}$ SI units.

A proton is moving undeflected in a region of crossed electric and magnetic fields at a constant speed of $2 \times 10^{5}\text{ ms}^{-1}$. When the electric field is switched off, the proton moves along a circular path of radius 2 cm. The magnitude of electric field is $x \times 10^{4}\text{ N/C}$. The value of $x$ is _________. Take the mass of the proton $= 1.6 \times 10^{-27}\text{ kg}$.

An electron projected perpendicular to a uniform magnetic field B moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is:

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): A simple pendulum is taken to a planet of mass and radius, 4 times and 2 times, respectively, that of the Earth. The time period of the pendulum remains same on earth and the planet.

Reason (R): The mass of the pendulum remains unchanged at Earth and the other planet. In the light of the above statements, choose the correct answer from the options given below:

A ball of mass 100 g is projected with velocity $20\text{ m/s}$ at $60^\circ$ with horizontal. The decrease in kinetic energy of the ball during the motion from point of projection to highest point is

A symmetric thin biconvex lens is cut into four equal parts by two planes $AB$ and $CD$ as shown in figure. If the power of original lens is 4D then the power of a part of the divided lens is

The torque due to the force $(2\hat{i}+\hat{j}+2\hat{k})$ about the origin, acting on a particle whose position vector is $(\hat{i}+\hat{j}+\hat{k})$, would be

To obtain the given truth table, following logic gate should be placed at G:

Given are statements for certain thermodynamic variables,

(A) Internal energy, volume $(V)$ and mass $(M)$ are extensive variables.

(B) Pressure (P), temperature ( T) and density ( $\rho$) are intensive variables.

(C) Volume (V), temperature (T) and density ( $\rho$) are intensive variables.

(D) Mass (M), temperature (T) and internal energy are extensive variables.

Choose the correct answer from the options given below:

For a diatomic gas, if $\gamma_1 = \left(\frac{C_p}{C_v}\right)$ for rigid molecules and $\gamma_2 = \left(\frac{C_p}{C_v}\right)$ for another diatomic molecules, but also having vibrational modes. Then, which one of the following options is correct? (Cp and Cv are specific heats of the gas at constant pressure and volume)

The maximum percentage error in the measurement of density of a wire is

[Given, mass of wire $= (0.60 \pm 0.003)\text{ g}$

radius of wire $= (0.50 \pm 0.01)\text{ cm}$

length of wire $= (10.00 \pm 0.05)\text{ cm}]$

Which one of the following is the correct dimensional formula for the capacitance in F? $\mathrm{M, L, T}$ and $C$ stand for unit of mass, length, time and charge respectively.

A small rigid spherical ball of mass M is dropped in a long vertical tube containing glycerine. The velocity of the ball becomes constant after some time. If the density of glycerine is half of the density of the ball, then the viscous force acting on the ball will be (consider g as acceleration due to gravity)

A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm. [Assume that the light is incident nearly perpendicular to the glass surface.]

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): In Young's double slit experiment, the fringes produced by red light are closer as compared to those produced by blue light.

Reason (R): The fringe width is directly proportional to the wavelength of light.

In the light of the above statements, choose the correct answer from the options given below:

A force $\vec{F} = 2\hat{i} + b\hat{j} + \hat{k}$ is applied on a particle and it undergoes a displacement $\hat{i} - 2\hat{j} - \hat{k}$. What will be the value of $b$, if work done on the particle is zero.