List of top Physics Questions asked in AP EAPCET

A train of mass \(10^6 \, \text{kg}\) is moving at a constant speed of \(108 \, \text{km/h}\). If the frictional force acting on it is \(0.5 \, \text{N per 100 kg}\), then the power of the train is
A particle crossing the origin at time \(t = 0\), moves in the xy-plane with a constant acceleration ‘a’ in y-direction. If the equation of motion of the particle is \(y = bx^2\) (where \(b\) is a constant), then its velocity component in the x-direction is
The magnitudes of two vectors are A and B (A>B). If the maximum resultant magnitude of the two vectors is ‘n’ times their minimum resultant magnitude, then \(\frac{A}{B} =\)
The ratio of the displacements of a freely falling body during second and fifth seconds of its motion is
The dimensional formula of Planck’s constant is
An unpolarised beam of light incidents on a group of three polarising sheets arranged such that the angle between the axes of any two adjacent sheets is $30^\circ$. The ratio of the intensities of polarised light emerging from the second and third sheets is
Two solid spheres each of radius \( R \) made of same material are placed in contact with each other. If the gravitational force acting between them is \( F \), then
The wavelength of spectral line corresponding to electron transition \( n = 3 \) to \( n = 2 \) for \( \text{Li}^{2+} \) ion is \( \lambda \,\text{nm} \). What is the wavelength (in nm) corresponding to electron transition \( n = 4 \) to \( n = 1 \) for \( \text{He}^+ \) ion?
The minimum length of an antenna to transmit a signal of frequency \( 3 \text{ kHz} \) is
An electron of specific charge \( \frac{e}{m} \) enters an electric field, \( \vec{E} = -E_0 \hat{i} \) at a time \( t = 0 \) with an initial velocity \( \vec{v}_1 \). If \( \lambda_0 \) is its initial de Broglie wavelength, then its de Broglie wavelength at a time ‘t’ is
If the half-life of a radioactive substance is 32 hours, then the fraction of the substance decayed in 4 days is
If the amplitude of electric field vector and frequency of an electromagnetic wave travelling along $z$-direction in vacuum are 180 N C$^{-1}$ and 60 GHz respectively, then the equation of the magnitude of the electric field of the plane electromagnetic wave is
If the angular momenta of electrons in two orbits of hydrogen atom are \( \frac{h}{\pi} \) and \( \frac{1.5h}{\pi} \), then the ratio of velocities of electrons in these two orbits is
(h – Planck’s constant)
If two diodes \( D_1 \) and \( D_2 \) are connected as shown in the figure, then
If two diodes
If the collector and base currents of a transistor in common emitter configuration are 5 mA and 50 \(\mu\)A, then the current amplification factor of the transistor is
If a capacitor of 500 nF is connected to an AC source of frequency 1 kHz, then the capacitive reactance of the capacitor is
Two concentric loops of radii 'r' and 'R' are in same plane such that \( R \gg r \). If a current \( I \) is maintained in the loop of radius \( r \), then the magnetic flux associated with the loop of radius 'R' due to this current is
If the operating magnetic field in a cyclotron for accelerating protons is 668 mT, then the angular frequency of the oscillator of the cyclotron is (Charge of proton \( = 1.6 \times 10^{-19} \,\mathrm{C} \), Mass of proton \( = 1.67 \times 10^{-27} \,\mathrm{kg} \))
Three identical bar magnets each of magnetic moment \( M \) are placed in the form of an equilateral triangle with north pole of one touching the south pole of the other. The net magnetic moment of the system of magnets is
When the current in a coil decreases from 10 A to \( I \) in a time of 2 seconds, the induced emf in the coil is \( \varepsilon_1 \). When the current in the coil decreases from \( I \) to zero in 4 seconds, the induced emf in the coil is \( \varepsilon_2 \). If the ratio of the induced emfs \( \varepsilon_1 : \varepsilon_2 = 2 : 3 \), then the value of \( I \) is
A 48 V battery is supplying a current 12 A when connected to an external resistor. If the efficiency of the battery at this current is 75%, then the internal resistance of the battery is
In the circuit of resistors shown in the figure, the effective resistance between points A and B is
effective resistance between points A and B is
A spherical black body of radius 12 cm at a temperature of \(T\) K radiates a power of 400 W. If the radius of the sphere is doubled and absolute temperature is halved, then the power radiated by the body is
Three point charges +10 µC, +20 µC, and +40 µC are placed at the vertices of an equilateral triangle of side 1 m. The electrostatic potential energy of the system of the charges is
The electric flux through the surface of a thin spherical shell of radius 6 cm, having a point charge 2 µC at its center is