List of top Questions asked in AP EAPCET- 2022

The ratio of radii of \(3^{rd}\) and \(6^{th}\) Bohr's orbit in a hydrogen atom is

A particle of mass \[ 2\times10^{-27}\,\text{kg} \] has de-Broglie wavelength of \[ 3.3\times10^{-10}\,\text{m}. \] The kinetic energy of this particle is:
\[ \text{(Planck’s constant } h=6.6\times10^{-34}\,\text{J-s)} \]

The frequency of the light emitted when an electron comes down from \(n=4\) to \(n=2\) level in hydrogen atom is \(\dfrac{3}{7}\) times of the following transition of the Li atom:

The values of \(Y\) and \(Z\) in the given logic circuit are

The frequency suitable for beyond the horizon communication using sky wave is

The correct order of electromagnetic waves with increasing frequency is

A \(70\,\text{mH}\) inductor is connected to \(220\,\text{V},\ 50\,\text{Hz}\) AC supply. The rms value of the current in the circuit is:

A plane electromagnetic wave of frequency \(50\,MHz\) travels in free space. If the average energy densities in the electric field and magnetic field are \(K_E\) and \(K_B\) respectively, then

An isosceles triangular current carrying loop is kept perpendicularly in a uniform magnetic field \(B_0\), as shown in figure. The force on the loop due to magnetic field is

A charged particle moving in a uniform magnetic field penetrates a layer of lead and thereby loses half of its kinetic energy, then the radius of curvature of its path is:

A short bar magnet placed with its axis at \(45^\circ\) with a uniform external magnetic field of \(28.3\times 10^{-3}\,T\) experiences a torque of magnitude equal to \(3.6\times 10^{-5}\,J\). The magnitude of magnetic moment of the magnet is nearly

A metal loop of area \[ 10\,\text{cm}^2 \] is placed in a region such that its area vector points along \(\hat{k}\). The region contains a uniform magnetic field of magnitude \(1.73\,\text{T}\) that points in the direction \[ \hat{i}+\hat{j}+\hat{k}. \] When the magnetic field is switched off, the field decreases to zero at a steady rate in \(10\,\text{s}\), then the magnitude of emf induced in the loop is:

A ray of light is incident at \(30^\circ\) from a medium of refractive index \(2\) into a medium of refractive index \(1\). Then the angle of refraction is:

The quantities that don't change when a resistor connected to a battery is heated due to the current are:
(A) Drift speed (B) Resistivity (C) Resistance (D) Number of free electrons

A battery with a \(12\,\text{V}\) emf has an initial charge of \(80\,\text{A h}\). If the potential across the terminals stays constant until battery is completely discharged, then this battery can deliver energy at the rate of \(120\,\text{W}\) for a time:

In a space having electric field \[ \vec{E}=A(x\hat{i}+y\hat{j}) \] the potential at a point \((10\,m,20\,m)\) is zero, then the potential at the origin is
\[ [A=10\,Vm^{-2}] \]

Electric potential due to a space is given by \[ \phi(x,y,z)=\phi_0\frac{x_0}{x} \] when \(x_0=5\,m\) and \(\phi_0=8\,V\). Find the electric field at \((10\,m,5\,m,5\,m)\)

A charge \(Q\) is to be divided between two objects. The values of the charges on the objects so that the electrostatic force between them will be maximum is:

A Carnot engine operating between temperatures \(600\,K\) and \(300\,K\), absorbs \(800\,J\) of heat from the source. The mechanical work done per cycle is

The rms speed of oxygen at room temperature is about \[ 500\,\text{m s}^{-1}. \] The rms speed of hydrogen at the same temperature is about:

Among the following, the equation representing a progressive wave is:
\[ \text{(A)}\quad y=2\cos3x\sin10t \] \[ \text{(B)}\quad y=2\sqrt{x-vt} \] \[ \text{(C)}\quad y=3\sin(5x-0.5t)+4\cos(x-0.5t) \] \[ \text{(D)}\quad y=\cos x\sin t+\cos2x\sin2t \]

A beam of light both reflects and refracts at the surface between air and glass. The index of refraction of the glass is \(1.4\). If the refracted and the reflected rays are perpendicular to each other, then the angle of incidence in the air is

A body cools down from \(75^\circ\text{C}\) to \(65^\circ\text{C}\) in \(10\) minutes. It will cool down from \(65^\circ\text{C}\) to \(55^\circ\text{C}\) in a time:

Time period of a simple pendulum is \(4\,\text{s}\) at a place on the earth where the acceleration due to gravity is \[ \pi^2\,\text{m/s}^2. \] Then the length of the pendulum in meters is:

An object of mass \(10\,\text{kg}\) is released from rest in a liquid. If the object moves a distance of \(2\,\text{m}\) while sinking in a time duration of \(1\,\text{s}\), then the mass of the liquid displaced by the submerged object is \((g=10\,\text{m/s}^2)\):