MHT CET 2024 Physics Paper: 2 May, Shift 2

The core used in transformer and other electromagnetic devices is laminated to

The magnetic energy in an inductor changes from maximum value to minimum value in 5 ms. When connected to an a.c. source, the frequency of the source is

$L = 2\text{ H}, C = 5\text{ mF}$ and $R = 12\ \Omega$ are connected in series to an a.c. generator of frequency 50 Hz. Then

Which of the following statements about the Bohr model of the hydrogen atom is false?

An electron of stationary Hydrogen atom passes from fifth energy level to ground level. The velocity that the atom acquired as a result of photo emission is

( $m =$ mass of electron, $R =$ Rydberg's constant)

( $h =$ Planck's constant)

The amount of work done in increasing the voltage across the plates of a capacitor form 5 V to 10 V is ' W '. The work done in increasing it from 10 V to 15 V will be (nearly)

Charge on a parallel plate capacitor of capacity C is Q, the electric field intensity between its two plates separated by a distance of $t$ is

The string of pendulum of length ' $L$ ' is displaced through $90^\circ$ from the vertical and released. Then the maximum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is ( $m =$ mass of pendulum, $g =$ acceleration due to gravity)

The current flowing in a coil is 3 A and the power consumed is 108 W. If the a.c. source is of $120\text{ V}, 50\text{ Hz}$, the resistance in the circuit is

In the following circuit, the current flowing through zener diode is

In the following circuit, the current $I_3$ is

When cell of E.M.F. ' $E_1$ ' is connected to potentiometer wire, the balancing length is $l_1$. Another cell of E.M.F. ' $E_2$ ' $(E_1 > E_2)$ is connected so that two cells oppose each other, then the balancing length is $l_2$. The ratio $E_1 : E_2$ is

The stopping potential for a photelectric emission process is 10 V. The maximum kinetic energy of the electrons ejected in the process is [Charge on electron $e = 1.6 \times 10^{-19}\text{ C}$ ]

The number of photoelectrons emitted for light of frequency $v$ (higher than the threshold frequency $(v_0)$ is proportional to

The coil and magnet are moved in the same direction with same speed (V). The induced e.m.f. is

An air cored coil has self inductance of 0.1 H. A soft iron core of relative permeability 1000 is introduced and the number of turns is reduced to $\left(\frac{1}{10}\right)$th. The value of self inductance is now

Which of the following statement is correct?

Four point charges each +q is placed on the circumference of a circle of diameter 2 d in such a way that they form a square. The potential at the centre is proportional to

A drum of radius ' $R$ ' full of liquid of density ' $d$ ' is rotated at angular velocity ' $\omega$ ' $\text{rad/s}$. The increase in pressure at the centre of the drum will be

The gravitational potential energy required to raise a satellite of mass ' $m$ ' to height ' $h$ ' above the earth's surface is ' $E_1$ '. Let the energy required to put this satellite into the orbit at the same height be ' $E_2$ '. If $M$ and $R$ are the mass and radius of the earth respectively then $E_1 : E_2$ is

Rate of flow of heat through a cylindrical rod is ' $H_1$ '. The temperature at the ends of the rod are ' $T_1$ ' and ' $T_2$ '. If all the dimensions of the rod become double and the temperature difference remains the same, the rate of flow of heat becomes ' $H_2$ '. Then

The temperature at which r.m.s. velocity of hydrogen molecules is 4.5 times that of an oxygen molecule at $47^\circ\text{C}$ is (Molecular weight of hydrogen and oxygen molecules are 2 and 32 respectively)

The average translational kinetic energy of nitrogen (molar mass 28) molecules at a particular temperature is 0.042 eV. The translational kinetic energy of oxygen molecules (molar mass 32) in eV at double the temperature is

The mass of the lift is 200 kg, when it ascends with an acceleration of $4\text{ m/s}^{2}$ then the tension in the cable supporting the lift will be [Given: Acceleration due to gravity $g = 10\text{ m/s}^{2}$ ]

A ferromagnetic material is heated above its curie temperature. The correct statement from the following is that

A driver applies the brakes on seeing the red traffic signal 400 m ahead. At the time of applying brakes, the vehicle was moving with $15\text{ m/s}$ and retarding at $0.3\text{ m/s}^2$. The distance of the vehicle from the traffic light one minute after application of brakes is

Three long, straight parallel wires carrying currents are arranged as shown. The wire C which carries a current of 5.0 A is so placed that it experiences no force. The distance of wire C from wire $D$ is

Cyclotron is used to

For a body performing simple harmonic motion, its potential energy is $E_x$ at displacement x and $E_y$ at displacement y from mean position. The potential energy $E_0$ at displacement $(x+y)$ is

The displacement of a particle performing S.H.M. is given by $Y = A\cos[\pi(t + \phi)]$. If at $t = 0$, the displacement is $y = 2\text{ cm}$ and velocity is $2\pi\text{ cm/s}$, the value of amplitude $A$ in cm is

A spring has a certain mass suspended from it and its period of vertical oscillations is $T_1$. The spring is now cut into two equal halves and the same mass is suspended from one of the halves. The period of vertical oscillations is now $T_2$. The ratio of $T_2/T_1$ is

The focal length of combination of lenses formed with lenses having power of +2.50 D and $-3.75$ D will be

A concave mirror of focal length ' $f$ ' produces an image ' $n$ ' time the size of the object. If the image is real, then the distance of the object from the mirror is

A solid sphere of mass ' $m$ ', radius ' $R$ ', having moment of inertia about an axis passing through center of mass as 'I' is recast into a disc of thickness ' $t$ ' whose moment of inertia about an axis passing through the rim (edge) \& perpendicular to plane remains 'I'. Then the radius of disc is

An inclined plane makes an angle of $30^\circ$ with the horizontal. A solid sphere rolling down this inclined plane from rest without slipping has a linear acceleration ( $g =$ acceleration due to gravity, $\sin 30^\circ = 0.5$)

The logic gate combination circuit shown in the figure performs the logic function of

The potential barrier in p-n junction diode is due to

Liquid drops are falling slowly one by one from vertical glass tube. The relation between the weight of a drop ' $w$ ', the surface tension ' $T$ ' and the radius ' $r$ ' of the bore of the tube is (Angle of contact is zero)

The first operation involved in a carnot cycle is

In an isobaric process

A fixed mass of gas at constant pressure occupies a volume ' V '. The gas undergoes a rise in temperature so that the r.m.s. velocity of the molecules is doubled. The new volume will be

A ball rises to surface at a constant velocity in liquid whose density is 4 times greater than that of the material of the ball. The ratio of the force of friction acting on the rising ball and its weight is

The driver of a car travelling with a speed ' $V_1$ ' $\text{m/s}$ towards a wall sounds a siren of frequency ' $n$ ' Hz. If the velocity of sound in air is ' V ' $\text{m/s}$, then the frequency of the sound reflected from the wall and as heard by the driver in Hz is

In a vibrating string with fixed ends the waves are of type

A stretched string is fixed at both ends. It is made to vibrate so that the total number of nodes formed in it is ' $x$ '. The length of the string in terms of the wavelength of waves formed in it is ( $\lambda =$ wavelength $)$

A sonometer wire is stretched by hanging a metal bob. The fundamental frequency of vibration of wire is ' $n_1$ '. When the bob is completely immersed in water, the frequency of vibration of wire becomes ' $n_2$ '. The relative density of the metal of the bob is

A diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then

Two points separated by a distance of 0.1 mm can just be seen in microscope when light of wavelength $6000\text{ Å}$ is used. If the light of wavelength $4800\text{ Å}$ is used, the limit of resolution will become

The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is $9 : 1$. The intensities of the light sources used are in the ratio