NEET 2023 Physics Paper

A $12\text{ V},\ 60\text{ W}$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220\text{ V}$. Assuming the transformer to be ideal, what is the current in the primary winding?

The magnetic energy stored in an inductor of inductance $4\,\mu\text{H}$ carrying a current of $2\text{ A}$ is:

For very high frequencies, the effective impedance of the circuit (shown in the figure) will be:-

The maximum power is dissipated for an ac in a/an:

An ac source is connected to a capacitor C. Due to decrease in its operating frequency

In a series LCR circuit, the inductance $L$ is $10\text{ mH}$, capacitance $C$ is $1\ \mu\text{F}$ and resistance $R$ is $100\ \Omega$. The frequency at which resonance occurs is :-

An ac source is connected in the given circuit. The value of $\phi$ will be:

If Z${}_{1}$ and Z${}_{2}$ are the impedances of the given circuits (a) and (b) as shown in figures, then choose the correct option

The net impedance of circuit (as shown in figure) will be:

The radius of inner most orbit of hydrogen atom is $5.3 \times 10^{-11}\text{ m}$. What is the radius of third allowed orbit of hydrogen atom?

The ground state energy of hydrogen atom is $-13.6\text{ eV}$. The energy needed to ionize hydrogen atom from its second excited state will be:

The angular momentum of an electron moving in an orbit of hydrogen atom is $1.5\left(\frac{h}{\pi}\right)$. The energy in the same orbit is nearly.

The wavelength of Lyman series of hydrogen atom appears in:

In hydrogen spectrum, the shortest wavelength in the Balmer series is $\lambda$. The shortest wavelength in the Brackett series is:

To produce an instantaneous displacement current of $2\text{ mA}$ in the space between the parallel plates of a capacitor of capacitance $4\ \mu\text{F}$, the rate of change of applied variable potential difference $\left(\frac{dV}{dt}\right)$ must be :-

The equivalent capacitance of the arrangement shown in figure is:

The equivalent capacitance of the system shown in the following circuit is:

Two particles A and B initially at rest, move towards each other under mutual force of attraction. At an instance when the speed of A is v and speed of B is 3v, the speed of centre of mass is:

10 resistors, each of resistance $\text{R}$ are connected in series to a battery of emf $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $n$ is:

A copper wire of radius $1\text{ mm}$ contains $10^{22}$ free electrons per cubic metre. The drift velocity for free electrons when $10\text{ A}$ current flows through the wire will be (Given, charge on electron $= 1.6 \times 10^{-19}\text{ C}$):

The magnitude and direction of the current in the following circuit is :-

A certain wire $\text{A}$ has resistance $81\ \Omega$. The resistance of another wire $\text{B}$ of same material and equal length but of diameter thrice the diameter of A will be:

The resistance of platinum wire at $0^\circ\text{C}$ is $2\ \Omega$ and $6.8\ \Omega$ at $80^\circ\text{C}$. The temperature coefficient of resistance of the wire is:

Resistance of a carbon resistor determined from colour codes is $(22000 \pm 5\%)\ \Omega$. The colour of third band must be:

The emf of a cell having internal resistance $1\ \Omega$ is balanced against a length of $330\text{ cm}$ on a potentiometer wire. When an external resistance of $2\ \Omega$ is connected across the cell, the balancing length will be:

If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is given by:

The minimum wavelength of $X$-rays produced by an electron accelerated through a potential difference of $V$ volts is proportional to:

The de Broglie wavelength associated with an electron, accelerated by a potential difference of 81 V is given by:

The work functions of Caesium $(\text{Cs})$, potassium $(\text{K})$ and Sodium (Na) are $2.14\text{ eV}, 2.30\text{ eV}$ and $2.75\text{ eV}$ respectively. If incident electromagnetic radiation has an incident energy of $2.20\text{ eV}$, which of these photosensitive surfaces may emit photoelectrons?

The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:

The net magnetic flux through any closed surface is:

An emf is generated by an ac generator having 100 turn coil, of loop area $1\text{ m}^2$. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of $0.05\text{ T}$ perpendicular to the axis of rotation of the coil. The maximum value of emf is :-

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $2.0\times 10^{10}\text{ Hz}$ and amplitude $48\text{ V m}^{-1}$. Then the amplitude of oscillating magnetic field is: (Speed of light in free space $= 3\times 10^{8}\text{ m s}^{-1}$)

An electric dipole is placed at an angle of $30^\circ$ with an electric field of intensity $2 \times 10^{5}\text{ NC}^{-1}$. It experiences a torque equal to $4\text{ N m}$. Calculate the magnitude of charge on the dipole, if the dipole length is $2\text{ cm}$.

An electric dipole is placed as shown in the figure.

The electric potential (in 102 V) at point P due to the dipole is ($\epsilon_0$ = permittivity of free space and $\frac{1}{4\pi\epsilon_0}$ = K):

According to Gauss law of electrostatics, electric flux through a closed surface depends on:

A charge $Q\ \mu\text{C}$ is placed at the centre of a cube. The flux coming out from any one of its faces will be (in SI unit):

If $\oint_s \vec{E} \cdot \overrightarrow{dS} = 0$ over a surface, then:

If a conducting sphere of radius $R$ is charged. Then the electric field at a distance $r\,(r > R)$ from the centre of the sphere would be, $(V =$ potential on the surface of the sphere)

The venturi-meter works on:

If $R$ is the radius of the earth and $g$ is the acceleration due to gravity on the earth surface. Then the mean density of the earth will be:

The escape velocity of a body on the earth surface is $11.2\text{ km/s}$. If the same body is projected upward with velocity $22.4\text{ km/s}$, the velocity of this body at infinite distance from the centre of the earth will be:

Two bodies of mass $m$ and $9m$ are placed at a distance $R$. The gravitational potential on the line joining the bodies where the gravitational field equals zero, will be ($G =$ gravitational constant):

A satellite is orbiting just above the surface of the earth with period $T$. If $d$ is the density of the earth and $G$ is the universal constant of gravitation, the quantity $\frac{3\pi}{Gd}$ represents:

The temperature of a gas is $-50^\circ\text{C}$. To what temperature the gas should be heated so that the rms speed is increased by $3$ times?

Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is 0.15 $\left(g = 10\text{ m s}^{-2}\right)$.

A block of mass 2 kg is placed on inclined rough surface AC (as shown in figure) of coefficient of friction $\mu$. If g = 10 m s${}^{-2}$, the net force (in N) on the block will be:

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is:

A bullet from a gun is fired on a rectangular wooden block with velocity $u$. When bullet travels $24\text{ cm}$ through the block along its length horizontally, velocity of bullet becomes $\frac{u}{3}$. Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is:

The variation of susceptibility $(\chi)$ with absolute temperature ( $\mathrm{T}$) for a paramagnetic material is represented as:

Let a wire be suspended from the ceiling (rigid support) and stretched by a weight $W$ attached at its free end. The longitudinal stress at any point of cross-sectional area $A$ of the wire is:

The amount of elastic potential energy per unit volume (in SI unit) of a steel wire of length $100\text{ cm}$ to stretch it by $1\text{ mm}$ is (if Young's modulus of the wire $= 2.0 \times 10^{11}\text{ Nm}^{-2}$):

A vehicle travels half the distance with speed $v$ and the remaining distance with speed $2v$. Its average speed is:

The position of a particle is given by

$\vec{r}(t) = 4t\hat{i} + 2t^2\hat{j} + 5\hat{k}$

where $t$ is in seconds and $r$ in metre. Find the magnitude and direction of velocity $v(t)$, at $t = 1\text{ s}$, with respect to $x$-axis

A wire carrying a current $I$ along the positive $x$-axis has length $L$. It is kept in a magnetic field $\vec{B} = (2\hat{i} + 3\hat{j} - 4\hat{k})\text{ T}$. The magnitude of the magnetic force acting on the wire is:

A long straight wire of length $2\text{ m}$ and mass $250\text{ g}$ is suspended horizontally in a uniform horizontal magnetic field of $0.7\text{ T}$. The amount of current flowing through the wire will be $\left(g = 9.8\text{ m s}^{-2}\right)$:

A very long conducting wire is bent in a semi-circular shape from $A$ to $B$ as shown in figure. The magnetic field at point $P$ for steady current configuration is given by:

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron:

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $\left(\frac{1}{16}\right)$th of its initial value?

A simple pendulum oscillating in air has a period of $\sqrt{3}\text{ s}$. If it is completely immersed in non- viscous liquid, having density $\left(\frac{1}{4}\right)$th of the material of the bob, the new period will be :-

The $x\text{-}t$ graph of a particle performing simple harmonic motion is shown in the figure. The acceleration of the particle at $t = 2\text{ s}$ is:

A bullet is fired from a gun at the speed of $280\text{ ms}^{-1}$ in the direction $30^\circ$ above the horizontal. The maximum height attained by the bullet is

$\left(g = 9.8\text{ ms}^{-2},\ \sin 30^\circ = 0.5\right)$ :-

A ball is projected from point A with velocity $20\text{ m s}^{-1}$ at an angle $60^\circ$ to the horizontal direction. At the highest point $\text{B}$ of the path (as shown in figure), the velocity $v\text{ ms}^{-1}$ of the ball will be:

Two thin lenses are of same focal lengths $(f)$, but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?

A horizontal ray of light is incident on the right angled prism with prism angle $6^\circ$. If the refractive index of the material of the prism is 1.5, then the angle of emergence will be:

$\epsilon_0$ and $\mu_0$ are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are $2\epsilon_0$ and $1.5\mu_0$ respectively, the refractive index of the medium will nearly be:

A lens is made up of 3 different transparent media as shown in figure. A point object O is placed on its axis beyond $2f$. How many real images will be obtained on the other side?

An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance x in front of the second wall. The required focal length of the lens will be:

Light travels a distance $x$ in time $t_1$ in air and $10x$ in time $t_2$ in another denser medium. What is the critical angle for this medium?

The ratio of radius of gyration of a solid sphere of mass $M$ and radius $R$ about its own axis to the radius of gyration of the thin hollow sphere of same mass and radius about its axis is :-

A constant torque of $100\text{ N m}$ turns a wheel of moment of inertia $300\text{ kg m}^{2}$ about an axis passing through its centre. Starting from rest, its angular velocity after $3\text{ s}$ is :-

The angular acceleration of a body, moving along the circumference of a circle, is:

On the basis of electrical conductivity, which one of the following materials has the smallest resistivity?

A p-type extrinsic semiconductor is obtained when Germanium is doped with:

The above figure shows the circuit symbol of a transistor. Select the correct statements given below:

(A) The transistor has two segments of p-type semiconductor separated by a segment of n-type semiconductor.

(B) The emitter is of moderate size and heavily doped.

(C) The central segment is thin and lightly doped.

(D) The emitter base junction is reverse biased in common emitter amplifier circuit.

For the following logic circuit, the truth table is:

The given circuit is equivalent to:

A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?

Given below are two statements:

Statement I: Photovoltaic devices can convert optical radiation into electricity.

Statement II: Zener diode is designed to operate under reverse bias in breakdown region. In the light of the above statements, choose the most appropriate answer from the options given below:

The amount of energy required to form a soap bubble of radius $2\text{ cm}$ from a soap is nearly: (surface tension of soap $= 0.03\text{ N m}^{-1}$)

A container of volume $200\text{ cm}^{3}$ contains 0.2 mole of hydrogen gas and 0.3 mole of argon gas. The pressure of the system at temperature $200\text{ K}$ ($R = 8.3\text{ J K}^{-1}\text{ mol}^{-1}$) will be :-

A Carnot engine has an efficiency of $50\%$ when its source is at a temperature $327^\circ\text{C}$. The temperature of the sink is :-

For the given cycle, the work done during isobaric process is:

The errors in the measurement which arise due to unpredictable fluctuations in temperature and voltage supply are:

The diameter of a spherical bob, when measured with vernier callipers yielded the following values: $3.33\text{ cm}, 3.32\text{ cm}, 3.34\text{ cm}, 3.33\text{ cm}$ and $3.32\text{ cm}$. The mean diameter to appropriate significant figures is:

A metal wire has mass $(0.4 \pm 0.002)\text{ g}$, radius $(0.3 \pm 0.001)\text{ mm}$ and length $(5 \pm 0.02)\text{ cm}$. The maximum possible percentage error in the measurement of density will nearly be:

The mechanical quantity, which has dimensions of reciprocal of mass $(\mathrm{M}^{-1})$ is:

Which of the following statements is not true?

The viscous drag acting on a metal sphere of diameter $1\text{ mm}$, falling through a fluid of viscosity $0.8\text{ Pa}$ s with a velocity of $2\text{ m s}^{-1}$ is equal to:

The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is

The $4$th overtone of a closed organ pipe is same as that of $3$rd overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is:

Which set of colours will come out in air for a situation shown in figure?

For Young's double slit experiment, two statements are given below:

Statement I: If screen is moved away from the plane of slits, angular separation of the fringes remains constant.

Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

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

A particle moves with a velocity $(5\hat{i} - 3\hat{j} + 6\hat{k})\text{ m s}^{-1}$ horizontally under the action of constant force $(10\hat{i} + 10\hat{j} + 20\hat{k})\text{ N}$. The instantaneous power supplied to the particle is:

The potential energy of a long spring when stretched by $2\text{ cm}$ is U. If the spring is stretched by $8\text{ cm}$, potential energy stored in it will be: