MHT CET 2025 Physics Paper: 19 Apr, Shift 1

The instantaneous value of current in an a.c. circuit is $I = 3 \sin\left(50\pi t + \frac{\pi}{4}\right)\text{ A}$. The current will be maximum for the first time at

An alternating voltage $E = 100\sqrt{2} \sin(50t)$ is connected to a $2\ \mu F$ capacitor through an a.c. ammeter. The ammeter reading will be

A series LCR circuit is connected to an a.c. source of $230\text{ V},\ 50\text{ Hz}$. The circuit contains resistance of $80\ \Omega$ an inductor having inductive reactance $70\ \Omega$ and a capacitor of capacitive reactance $130\ \Omega$. The power factor of the circuit is $x$. The value of $x$ is

The ratio of the wavelength of the last line of Paschen series to that of Balmer series is

If ' $\lambda_1$ ' and ' $\lambda_2$ ' are the wavelengths of the first member of the Balmer and Paschen series, in hydrogen atom respectively, then the ratio of respective frequencies, $f_1/f_2$, is

The plates of a parallel plate capacitor are separated by a distance 'd' with air as the medium between them. A dielectric slab of dielectric constant 3 is introduced between the plates so as to increase the capacity by $50\%$. The thickness of the dielectric slab is

When a ceiling fan is switched off, its angular velocity falls to $\left(\frac{1}{3}\right)$rd while it makes 24 rotations. How many more rotations will it make before coming to rest?

If only $5\%$ of the total current is to be passed through galvanometer of resistance G, then the resistance of the shunt will be

The scale of a galvanometer is divided into 160 equal divisions. The galvanometer shows full scale deflection of 16 mA and maximum voltage is 80 mV. Now the range is changed so that galvanometer reads 160 V. The required resistance to be connected is

Light of wavelength $\lambda$ strikes a photoelectric surface and electrons are ejected with energy E. If $E$ is to be increased to twice the original value, the wavelength changes to $\lambda_1$

In a photoelectric experiment, if the intensity of incident light is doubled and the frequency is kept slightly greater than threshold frequency, then the saturation photoelectric current

Two conducting circular loops of radii $R_1$ and $R_2$ are placed in the same plane with their centres coinciding. If $R_1 > R_2$, the mutual inductance M between them will be directly proportional to

The self-inductance of a circuit is numerically equal to

When three inductors of same inductance ' $L$ ' are connected in series and ' I ' is the current passing through the circuit. The energy stored in the circuit is

Two charges $q_1 = +6q$ and $q_2 = -3q$ placed as shown in figure. A proton is placed on x -axis away from $q_2$. To remain proton in equilibrium, the distance between $q_1$ and proton is

An electric dipole of dipole moment ' $p$ ' is aligned parallel to a uniform electric field ' E '. The energy required to rotate the dipole by $90^\circ$ is $\left[\begin{matrix}\sin 0^\circ = 0, & \sin 90^\circ = 1 \\ \cos 0^\circ = 1, & \cos 90^\circ = 0\end{matrix}\right]$

Let ' $W$ ' joule be the work done to move an electric charge ' $q$ ' coulomb from a place $A$, where potential is -5 volt to another place $B$ where potential is ' $V$ ' volt. The value of ' $V$ ' is

Two particles of equal mass ' $m$ ' move in a circle of radius ' $r$ ' under the action of their mutual gravitational attraction. The speed of each particle will be ( $G =$ Universal gravitational constant)

Black sphere of radius R radiates power P at certain temperature $T$. If the temperature is doubled, the radius gets doubled. Now the power radiated would be

The ratio of angular momentum $L$ of an electron to the magnetic dipole moment $\vec{m}$orb is ( ' $m$ ' is mass of electron, ' $e$ ' is charge on electron)

Two long straight wires A and B carrying equal current 'I' were kept parallel to each other at distance ' $d$ ' apart. Magnitude of magnetic force experienced by length $L$ of wire $A$ is ' $F$ '. If the distance between the wires is made half and currents are doubled, force $F_2$ on length $L$ of wire $A$ will be

Two long parallel wires carrying currents 4 A and 3 A in opposite directions are placed at a distance of 5 cm from each other. A point P is at equidistance from both the wires such that the line joining the point P to the wires are perpendicular to each other. The magnitude of magnetic field at point $P$ is ( $\mu_0 =$ permeability of free space $= 4\pi \times 10^{-7}$ SI unit)

The time period of a simple pendulum inside a stationary lift is $\sqrt{3}$ second. When the lift moves upwards with an acceleration $g/3$, the time period will be ( $g =$ acceleration due to gravity)

' $P$ ' and ' $Q$ ' are fixed points in same plane and mass ' $m$ ' is tied by string as shown in figure. If the mass is displaced slightly out of this plane and released, it will oscillate with time period $(PQ = 2d, PR = QR = L)(g =$ gravitational acceleration)

A mass suspended from a vertical spring performs S.H.M. of period 0.1 second. The spring is unstretched at the highest point of suspension. Maximum speed of the mass is (Gravitational acceleration $g = 10\text{ m/s}^2$)

For a thin prism, $\delta_1$ is the angle of deviation produced, when prism is placed in air. When the prism is immersed in water, the angle of deviation produced is $\delta_2$. Given ${}_a\mu_g = \frac{3}{2}$ and ${}_a\mu_w = \frac{4}{3}$. The ratio $\delta_2 : \delta_1$ is

Four particles each of mass M are placed at the corners of a square of side $L$. The radius of gyration of the system about an axis perpendicular to the square and passing through its centre is

A thin uniform rod of mass ' $m$ ' and length ' $L$ ' is pivoted at one end so that it can rotate in a vertical plane. The free end is held vertically above pivot and then released. The angular acceleration of the rod when it makes an angle ' $\theta$ ' with the vertical is [consider negligible friction at the pivot] ( $g =$ acceleration due to gravity)

If $\vec{F} = (5\hat{i}-10\hat{j})$ and $\vec{r} = (4\hat{i}-3\hat{j})$, then the torque acting on the object will be

For a common emitter transistor, if $\frac{I_\text{C}}{I_\text{E}} = 0.95$, then the current gain is

In the case of constant ' $\alpha$ ' and ' $\beta$ ' of a transistor ( $\alpha$ and $\beta$ are current ratios)

In the depletion layer of reverse biased p-n junction, the

A liquid rises to a height of 2.4 cm in a glass capillary P. Another glass capillary Q having diameter $80\%$ of capillary $P$ is immersed in the same liquid. The rise of liquid in capillary $Q$ is

One end of a capillary tube is dipped in water, the rise of water column is ' $h$ '. The upward force of 98 dyne due to surface tension is balanced by the force due to the weight of the water column. The inner circumference of the capillary is $($ surface tension of water $= 7 \times 10^{-2}\text{ N m}^{-1})$

When a big drop of water is formed from ' $n$ ' small drops of water, the energy loss is ' 3 E ' where ' $E$ ' is the energy of the bigger drop. The radius of the bigger drop is ' R ' and that of smaller drop is ' $r$ ' then the value of ' $n$ ' is

For ideal non-rigid diatomic gas, the value of $\frac{R}{C_V}$ is nearly $\left(\gamma = \frac{C_P}{C_V} = \frac{9}{7}\right)$

The molar specific heat of an ideal gas at constant pressure and constant volume is ' $C_p$ ' and ' $C_v$ ' respectively. If ' R ' is a universal gas constant and the ratio of ' $C_p$ ' to ' $C_v$ ' is $\gamma$, then ' $C_p$ ' is equal to

When the heat is given to a gas in an Isothermal process, then there will be

Three samples $X, Y$, and $Z$ of same gas have equal volumes and temperatures. The volume of each sample is doubled, the process being isothermal for X, adiabatic for Y and isobaric for Z. If the final pressures are equal for the three samples, the ratio of the initial pressures is ( $\gamma = 3/2$)

Two rods of different materials have lengths ' $l_1$ ' and ' $l_2$ ' whose coefficient of linear expansions are ' $\alpha_1$ ' and ' $\alpha_2$ ' respectively. If the difference between the two lengths is independent of temperature then

The formula for the physical quantity is $P = \frac{x^{3} y}{z^{2}}$ and the percentage error in the determination of physical quantities $x, y, z$ are $0.6\%,\ 3\%$ and $1.3\%$ respectively. The percentage error in the measurement of P is

When source of sound moves towards a stationary observer, the apparent frequency heard by him

The frequency of fourth overtone of a closed pipe is in unison with the fifth overtone of an open pipe. The ratio of length of closed pipe to that of open pipe is

The fundamental frequency of a closed pipe of length $L$ is equal to the second overtone of a pipe open at both the ends of length (XL). The value of X is (Neglect end correction)

A string of mass per unit length $0.1\text{ kg m}^{-1}$ has length 0.9 m. It is fixed at both ends and stretched such that it has a tension of 40 N. The string vibrates in three segments with amplitude 0.3 cm. The amplitude (maximum) of the particle velocity is (in $\text{m/s}$)

In a Fraunhoffer diffraction, light of wavelength ' $\lambda$ ' is incident on slit of width ' d '. The diffraction pattern is observed on a screen placed at a distance ' $D$ '. The linear width of central maximum is equal to two times the width of the slit, then 'D' has value

Three identical polaroids $P_1, P_2$ and $P_3$ are placed one after another. The pass axis of $P_2$ and $\mathrm{P}_3$ are inclined at an angle of $60^\circ$ and $90^\circ$ with respect to axis of $\mathrm{P}_1$. The source has an intensity $256\text{ W/m}^2$. The intensity of light at point ' O ' is $\left(\cos 30^\circ = \sqrt{3}/2, \cos 60^\circ = 0.5\right)$

In Young's double slit interference experiment, using two coherent sources of different amplitudes, the intensity ratio between bright to dark fringes is $5 : 1$. The value of the ratio of resultant amplitudes of bright fringe to dark fringe is