NEET 2023

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

A \(12 \mathrm{~V}, 60 \mathrm{~W}\) lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of \(220 \mathrm{~V}\). Assuming the transformer to be ideal, what is the current in the primary wind...

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

The magnetic energy stored in an inductor of inductance \(4 ~\mu \mathrm{H}\) carrying a current of \(2 \mathrm{~A}\) is :

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

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

In hydrogen spectrum, the shortest wavelength in the Balmer series is \(\lambda\). The shortest wavelength in the Bracket series is :

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

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

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

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

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

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

10 resistors, each of resistance \(\mathrm{R}\) 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 ...

The work functions of Caesium \((\mathrm{Cs})\), potassium \((\mathrm{K})\) and Sodium (Na) are \(2.14 ~\mathrm{eV}, 2.30 ~\mathrm{eV}\) and \(2.75 ~\mathrm{eV}\) respectively. If incident electromagnetic radiation has an incident energy of...

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

The net magnetic flux through any closed surface is :

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of \(2.0 \times 10^{10} \mathrm{~Hz}\) and amplitude \(48 ~\mathrm{Vm}^{-1}\). Then the amplitude of oscillating m...

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

If \(\oint_\limits{s} \vec{E} \cdot \overrightarrow{d S}=0\) over a surface, then:

An electric dipole is placed as shown in the figure.

The electric potential (in 102 V) at point P due to the dipole is (\(\in_0\) = permittivity of free space and \(\frac{1}{4 \pi \epsilon_{0}}\) = K) :

Light travels a distance \(\mathrm{x}\) in time \(t_{1}\) in air and \(10 \mathrm{x}\) in time \(t_{2}\) in another denser medium. What is the critical angle for this medium?

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

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 :

Two bodies of mass \(m\) and \(9 m\) 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 \(\frac{3 \pi}{G d}\) represents :

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

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

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 :

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
\(\left(g=10 \mathrm{~m} \mathrm{~s}^{-2}\right)\)...

A bullet from a gun is fired on a rectangular wooden block with velocity \(u\). When bullet travels \(24 \mathrm{~cm}\) through the block along its length horizontally, velocity of bullet becomes \(\frac{u}{3}\). Then it further penetrates ...

A bullet is fired from a gun at the speed of \(280 \mathrm{~ms}^{-1}\) in the direction \(30^{\circ}\) above the horizontal. The maximum height attained by the bullet is
\(\left(g=9.8 \mathrm{~ms}^{-2}, \sin 30^{\circ}=0.5\right)\):-

A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity \(4 \mathrm{~m} \mathrm{~s}^{-1}\). The ball strikes the water surface after \(4 \mathrm{~s}\). The height ...

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

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

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

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

The venturi-meter works on :

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 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 :-

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

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 statement...

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?

For the following logic circuit, the truth table is:

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

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

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 b...

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

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