NEET 2023 Physics Questions

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 $\vec r$ in metres. Find the magnitude and direction (with respect to the $x$-axis) of the velocity $\vec v(t)$ at $t=1$ s.

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 directed:

A ball is projected from point A with a velocity 20 m/s at an angle $60^\circ$ to the horizontal direction. At the highest point B of the path, the speed $v$ (in m/s) of the ball will be:

A bullet is fired from a gun at a speed of 280 m/s in a direction $30^\circ$ above the horizontal. The maximum height attained by the bullet is ($g=9.8\ \mathrm{m/s^2}$, $\sin30^\circ=0.5$):

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

A particle is executing uniform circular motion with velocity $\vec v$ and acceleration $\vec a$. Which of the following is true?

Two particles A and B, initially at rest, move towards each other under their mutual attraction. When A's speed is v and B's speed is 3v, the speed of the centre of mass of the system is:

The ratio of the radius of gyration of a solid sphere (about its own axis) to that of a thin hollow sphere of the same mass and radius (about its axis) is:

A constant torque of 100 N·m turns a wheel of moment of inertia 300 kg·m² about an axis through its centre. Starting from rest, its angular velocity after 3 s is:

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

A 1 kg object strikes a wall with a velocity of 1 m/s at an angle of 60° with the wall and reflects at the same angle. If it remains in contact with the wall for 0.1 s, the force exerted on the wall is:

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 (g = 10 m/s²):

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

A block of mass 2 kg is placed on a rough inclined surface AC (as shown) of coefficient of friction μ. It remains at rest. Taking g = 10 m/s², the net force on the block is:

The diameter of a spherical bob, measured with vernier callipers, yielded the values: 3.33 cm, 3.32 cm, 3.34 cm, 3.33 cm and 3.32 cm. The mean diameter to appropriate significant figures is:

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

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

The mechanical quantity, which has dimensions of the reciprocal of mass (M⁻¹) is:

Two bodies of mass m and 9m are placed a distance R apart. The gravitational potential at the point on the line joining them where the gravitational field is zero is (G = gravitational constant):

If R is the radius of the earth and g the acceleration due to gravity on its surface, the mean density of the earth is:

A satellite orbits just above the earth's surface with period T. If d is the mean density of the earth and G the gravitational constant, the quantity 3π/(Gd) represents:

The escape velocity of a body from the earth's surface is 11.2 km/s. If the same body is projected upward with velocity 22.4 km/s, its velocity at infinite distance from the centre of the earth will be:

The venturi-meter works on:

The amount of energy required to form a soap bubble of radius 2 cm from a soap solution is nearly: (surface tension of soap solution = 0.03 N m⁻¹)

The viscous drag acting on a metal sphere of diameter 1 mm, falling through a fluid of viscosity 0.8 Pa·s with a velocity of 2 m s⁻¹, is equal to:

A simple pendulum oscillating in air has a period of √3 s. If it is completely immersed in a non-viscous liquid having density 1/4 th of the material of the bob, the new period will be:

A ball is thrown vertically upward with a velocity of 4 m/s from a bridge. The ball strikes the water surface after 4 s. The height of the bridge above the water surface is (g = 10 m/s$^2$):

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

A bullet enters a wooden block with speed u and, after travelling 24 cm inside it, its speed reduces to u/3. Assuming uniform retardation, the further distance it travels before coming to rest is:

A particle moves with a velocity (6î-4ĵ+3k̂) m/s under the action of a constant force F=(10î+10ĵ+20k̂) N. The instantaneous power applied to the particle is

A bullet of mass m hits a block of mass M elastically. The transfer of energy is maximum when

The potential energy of a spring when stretched by 2 cm is U. If the spring is stretched by 8 cm, the potential energy stored in it will be

A Carnot engine has an efficiency of $50\%$ when its source is at $327\,^\circ$C. The temperature of the sink is

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

Reversible expansion of an ideal gas under isothermal and adiabatic conditions is shown in the figure, where $AB$ is the isothermal expansion and $AC$ is the adiabatic expansion, both starting from the common state $A$. Which of the following options is NOT correct?

A container of volume 200 cm³ contains 0.2 mole of hydrogen gas and 0.3 mole of argon gas. The pressure of the system at temperature 200 K (R = 8.3 J K⁻¹ mol⁻¹) will be:

The temperature of a gas is −50 °C. To what temperature should the gas be heated so that the rms speed is increased by 3 times?

A wire is suspended from the ceiling 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 cm stretched by 1 mm is (Young's modulus of the wire = 2.0 × 10¹¹ N m⁻²)

The x–t graph of a particle performing simple harmonic motion is shown in the figure. The acceleration of the particle at t = 2 s is

A simple pendulum oscillating in air has a period of √3 s. If it is completely immersed in a non-viscous liquid whose density is one-fourth that of the material of the bob, the new period is

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

The ratio of the fundamental frequency of an open pipe to that of a closed pipe of the same length is:

10 resistors (R each) in series with a battery (emf E, negligible internal resistance); then connected in parallel — the current increases n times. The value of n is:

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

A copper wire of radius 1 mm contains 10$^{22}$ free electrons per m$^{3}$. The drift velocity for a 10 A current is (e = 1.6$\times$10$^{-19}$ C):

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

Wire A has resistance 81 $\Omega$. Wire B (same material, equal length, diameter three times that of A) has resistance:

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

The emf of a cell (internal resistance 1 $\Omega$) balances at 330 cm on a potentiometer. With a 2 $\Omega$ external resistance across the cell, the balance length is:

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

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

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

The net impedance of circuit (as shown in figure) will be (series circuit with R = 10 Ω, an inductor and a capacitor driven by an AC source; from the figure values X_L = 5 Ω and X_C = 10 Ω).

In a series LCR circuit, the inductance L is 10 mH, capacitance C is 1 μF and resistance R is 100 Ω. The frequency at which resonance occurs is:

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

If Z₁ and Z₂ are the impedances of the given circuits (a) and (b) as shown in figures, then choose the correct option.

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:

An ac source is connected in the given circuit. The value of φ will be: V = 220 sin(100πt + φ) volt

Two thin lenses are of the same focal length (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, what is the equivalent focal length of the combination of lenses (assume that all layers are thin)? The two outer lenses are glass (µ = 1.5) with curved-face radius 20 cm; the middle layer (µ = 1.6) is bounded by two plane faces.

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 a distance x in front of the second wall. The required focal length of the lens will be:

Light travels a distance x in time t₁ in air and 10x in time t₂ in another denser medium. What is the critical angle for this medium?

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

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

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

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

For the following logic circuit, the truth table is:

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 removes the ac ripple from the rectified output?

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

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 given circuit is equivalent to a single:

An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 10⁵ N/C. It experiences a torque equal to 4 N·m. The charge on the dipole, if the dipole length is 2 cm, is

An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 10⁵ N C⁻¹. It experiences a torque equal to 4 N m. Calculate the magnitude of charge on the dipole, if the dipole length is 2 cm.

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

A charge Q µC is placed at the centre of a cube. The flux coming out from any one of its faces will be (in SI unit):

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):

If ∮ₛ E · dS = 0 over a closed surface, then:

The wavelength of Lyman series of hydrogen atom appears in:

The angular momentum of an electron moving in an orbit of hydrogen atom is 1.5(h/π). The energy in the same orbit is nearly:

The radius of innermost orbit of hydrogen atom is 5.3 × 10⁻¹¹ m. What is the radius of the third allowed orbit of hydrogen atom?

In hydrogen spectrum, the shortest wavelength in the Balmer series is λ. The shortest wavelength in the Brackett series is:

The ground state energy of hydrogen atom is –13.6 eV. The energy needed to ionize hydrogen atom from its second excited state will be:

An electric dipole is placed as shown in the figure. The electric potential (in 10² V) at point P due to the dipole is (ε₀ = permittivity of free space and K = 1/(4πε₀)):

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

The equivalent capacitance of the arrangement shown in figure is

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)

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of 2.0 ×10¹⁰ Hz and amplitude 48 V/m. Then the amplitude of the oscillating magnetic field is (speed of light in free space = 3 ×10⁸ m/s)

ε₀ and µ₀ are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are 2ε₀ and 1.5µ₀ respectively, the refractive index of the medium will nearly be

To produce an instantaneous displacement current of 2 mA in the space between the parallel plates of a capacitor of capacitance 4 µF, the rate of change of applied variable potential difference (dV/dt) must be

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

A long straight wire of length 2 m and mass 250 g is suspended horizontally in a uniform horizontal magnetic field of 0.7 T. The amount of current flowing through the wire will be (g = 9.8 m s⁻²)

A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field B = (2î + 3ĵ − 4k̂) T. The magnitude of the magnetic force acting on the wire is:

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

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:

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

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

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

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

The variation of susceptibility (χ) with absolute temperature (T) for a paramagnetic material is represented as: [the four options plot χ against 1/T]

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 m². The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of 0.05 T perpendicular to the axis of rotation of the coil. The maximum value of emf is:

The magnetic energy stored in an inductor of inductance 4 µH carrying a current of 2 A is:

For Young's double slit experiment, two statements are given below: Statement I: If the screen is moved away from the plane of the slits, the 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: