NEET 2024 (Re-Examination)

A step up transformer is connected to an ac mains supply of \(220 \mathrm{~V}\) to operate at \(11000 \mathrm{~V}, 88\) watt. The current in the secondary circuit, ignoring the power loss in the transformer, is

The amplitude of the charge oscillating in a circuit decreases exponentially as \(Q=Q_0 e^{-R t/2 L}\), where \(Q_0\) is the charge at \(t=0 \mathrm{~s}\). The time at which charge amplitude decreases to \(0.50 Q_0\) is nearly:
[Given that ...

In the circuit shown below, the inductance \(L\) is connected to an ac source. The current flowing in the circuit is \(I=I_0 \sin \omega t\). The voltage drop \(\left(V_L\right)\) across \(L\) is

The spectral series which corresponds to the electronic transition from the levels \(n_2=5,6, \ldots\) to the level \(n_1=4\) is

Water is used as a coolant in a nuclear reactor because of its

Select the correct statements among the following :
A. Slow neutrons can cause fission in \({ }_{92}^{235} \mathrm{U}\) than fast neutrons.
B. \(\alpha\)-rays are Helium nuclei.
C. \(\beta\)-rays are fast moving electrons or positrons.
D. $...

Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then :

A \(12 \mathrm{~pF}\) capacitor is connected to a \(50 \mathrm{~V}\) battery, the electrostatic energy stored in the capacitor in \(\mathrm{nJ}\) is

The capacitance of a capacitor with charge \(q\) and a potential difference \(V\) depends on

The steady state current in the circuit shown below is :

A uniform wire of diameter \(d\) carries a current of \(100 \mathrm{~mA}\) when the mean drift velocity of electrons in the wire is \(v\). For a wire of diameter \(\frac{d}{2}\) of the same material to carry a current of $$200 \mathrm{~mA}$...

The given circuit shows a uniform straight wire \(A B\) of \(40 \mathrm{~cm}\) length fixed at both ends. In order to get zero reading in the galvanometer \(G\), the free end of \(J\) is to be placed from \(B\) at:

A uniform metal wire of length \(l\) has \(10 \Omega\) resistance. Now this wire is stretched to a length \(2l\) and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is

An electron and an alpha particle are accelerated by the same potential difference. Let \(\lambda_e\) and \(\lambda_\alpha\) denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:

If \(\phi\) is the work function of photosensitive material in \(\mathrm{eV}\) and light of wavelength of numerical value \(\lambda=\frac{h c}{e}\) metre, is incident on it with energy above its threshold value at an instant then the maximu...

Let us consider two solenoids \(A\) and \(B\), made from same magnetic material of relative permeability \(\mu_r\) and equal area of cross-section. Length of \(A\) is twice that of \(B\) and the number of turns per unit length in \(A\) is h...

The electromagnetic radiation which has the smallest wavelength are

If the ratio of relative permeability and relative permittivity of a uniform medium is \(1: 4\). The ratio of the magnitudes of electric field intensity \((E)\) to the magnetic field intensity \((H)\) of an EM wave propagating in that mediu...

A metal cube of side \(5 \mathrm{~cm}\) is charged with \(6 \mu \mathrm{C}\). The surface charge density on the cube is

The value of electric potential at a distance of \(9 \mathrm{~cm}\) from the point charge \(4 \times 10^{-7} \mathrm{C}\) is [Given \(\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9 \mathrm{~N} \mathrm{~m}^2 \mathrm{C}^{-2}\)] :

Given below are two statements:
Statement I : Image formation needs regular reflection and/or refraction.
Statement II : The variety in colour of objects we see around us is due to the constituent colours of the light incident on them.
In t...

The escape velocity for earth is \(v\). A planet having 9 times mass that of earth and radius, 16 times that of earth, has the escape velocity of:

An object of mass \(100 \mathrm{~kg}\) falls from point \(A\) to \(B\) as shown in figure. The change in its weight, corrected to the nearest integer is (\(R_E\) is the radius of the earth)

Given below are two statements: One is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\).
Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer.
Reason R: The ...

The equilibrium state of a thermodynamic system is described by
A. Pressure
B. Total heat
C. Temperature
D. Volume
E. Work done
Choose the most appropriate answer from the options given below.

According to the law of equipartition of energy, the number of vibrational modes of a polyatomic gas of constant \(\gamma=\frac{C_p}{C_v}\) is (\(C_P\) where \(C_V\) are the specific heat capacities of the gas at constant pressure and const...

A box of mass \(5 \mathrm{~kg}\) is pulled by a cord, up along a frictionless plane inclined at \(30^{\circ}\) with the horizontal. The tension in the cord is \(30 \mathrm{~N}\). The acceleration of the box is (Take $$g=10 \mathrm{~m} \math...

The magnetic potential energy, when a magnetic bar of magnetic moment \(\vec{m}\) is placed perpendicular to the magnetic field \(\vec{B}\) is

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and \(\varepsilon\) is a small positive number) is

The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, \(1.0 \times 10^{-2} \mathrm{~A} \mathrm{~m}^2\) and \(\frac{10^{-6}}{\pi^2} \mathrm{~kg} \mathrm{~m}^2\). If it completes 10 oscillations in $$10 \m...

The magnetic moment of an iron bar is \(M\). It is now bent in such a way that it forms an arc section of a circle subtending an angle of \(60^{\circ}\) at the centre. The magnetic moment of this arc section is

A bob is whirled in a horizontal circle by means of a string at an initial speed of \(10 \mathrm{~rpm}\). If the tension in the string is quadrupled while keeping the radius constant, the new speed is:

Let \(\omega_1, \omega_2\) and \(\omega_3\) be the angular speed of the second hand, minute hand and hour hand of a smoothly running analog clock, respectively. If \(x_1, x_2\) and \(x_3\) are their respective angular distances in 1 minute ...

A particle is moving along \(x\)-axis with its position (x) varying with time \((t)\) as \(x=\alpha t^4+\beta t^2+\gamma t+\delta\). The ratio of its initial velocity to its initial acceleration, respectively, is:

A particle executing simple harmonic motion with amplitude A has the same potential and kinetic energies at the displacement

The two-dimensional motion of a particle, described by \(\vec{r}=(\hat{i}+2 \hat{j}) A \cos \omega t\) is a/an:
A. parabolic path
B. elliptical path
C. periodic motion
D. simple harmonic motion
Choose the correct answer from the options giv...

An ideal fluid is flowing in a non-uniform cross-sectional tube \(X Y\) (as shown in the figure) from end \(X\) to end \(Y\). If \(K_1\) and \(K_2\) are the kinetic energy per unit volume of the fluid at \(X\) and \(Y\) respectively, then t...

The radius of gyration of a solid sphere of mass \(5 \mathrm{~kg}\) about \(X Y\) is \(5 \mathrm{~m}\) as shown in figure. The radius of the sphere is \(\frac{5 x}{\sqrt{7}} \mathrm{~m}\), then the value of $x$ is:

When the output of an OR gate is applied as input to a NOT gate, then the combination acts as a

The I-V characteristics shown above are exhibited by a

The output Y for the inputs A and B of the given logic circuit is:

In an electrical circuit, the voltage is measured as \(V=(200 \pm 4)\) volt and the current is measured as \(I=(20 \pm 0.2)\) A. The value of the resistance is:

The pitch of an error free screw gauge is \(1 \mathrm{~mm}\) and there are 100 divisions on the circular scale. While measuring the diameter of a thick wire, the pitch scale reads \(1 \mathrm{~mm}\) and \(63^{\text {rd }}\) division on the ...

The potential energy of a particle moving along \(x\)-direction varies as \(V=\frac{A x^2}{\sqrt{x}+B}\). The dimensions of \(\frac{A^2}{B}\) are:

Two slits in Young's double slit experiment are \(1.5 \mathrm{~mm}\) apart and the screen is placed at a distance of \(1 \mathrm{~m}\) from the slits. If the wavelength of light used is \(600 \times 10^{-9} \mathrm{~m}\) then the fringe sep...

Interference pattern can be observed due to superposition of the following waves:
A. \(y=a \sin \omega t\)
B. \(y=a \sin 2 \omega t\)
C. \(y=a \sin (\omega t-\phi)\)
D. \(y=a \sin 3 \omega t\)
Choose the correct answer from the options give...

A beam of unpolarized light of intensity I0 is passed through a polaroid A, then through another polaroid B,
oriented at \(60^\circ\) and finally through another polaroid C, oriented at 45\(^\circ\) relative to B as shown. The intensity of
...

The displacement of a travelling wave \(y=C \sin \frac{2 \pi}{\lambda}\) (at \(-x\)) where \(t\) is time, \(x\) is distance and \(\lambda\) is the wavelength, all in S.I. units. Then the frequency of the wave is

An object moving along horizontal \(x\)-direction with kinetic energy \(10 \mathrm{~J}\) is displaced through \(x=(3 \hat{i}) \mathrm{m}\) by the force \(\vec{F}=(-2 \hat{i}+3 \hat{j}) \mathrm{N}\). The kinetic energy of the object at the e...

An object falls from a height of \(10 \mathrm{~m}\) above the ground. After striking the ground it loses \(50 \%\) of its kinetic energy. The height upto which the object can rebounce from the ground is: