List of top Physics Questions asked in AP EAMCET

Semiconductors suitable for solar cell fabrication have a band gap nearby:
In the hydrogen spectrum, the difference in frequencies of first and second Lyman lines is equal to the frequency of the second Balmer line. This corresponds to:
An electromagnetic wave travels in a medium of relative permeability \(1.3\) and relative permittivity \(2.3\). Then the speed of an electromagnetic wave in that medium is

In the given LCR series circuit the quality factor is


 

Eddy currents are produced when
A bar magnet of moment \(0.4 \times 10^{-3} \, {Am}^2\) is kept in a magnetic field of \(2\pi \times 10^{-3} \, {T}\). The magnet makes an angle of \(45^\circ\) with the direction of magnetic field. The torque acting on the magnet is:
If \( n_e \) and \( n_h \) are concentrations of electrons and holes in a semiconductor, then the intrinsic carrier concentration (\( n_i \)) in thermal equilibrium is
A mixture consists of two radioactive materials \( A_1 \) and \( A_2 \) with half-lives of 20 s and 10 s respectively. Initially, the mixture has 40 g of \( A_1 \) and 160 g of \( A_2 \). The amount of the two in the mixture will become equal after
Energy required to remove an electron from an aluminium surface is 4.2 eV. If light of wavelength 2000 Å falls on the surface, the velocity of the fastest electron ejected from the surface will be
Drift speed \( v \) varies with the intensity of the electric field \( E \) as per the relation
In Young’s double-slit experiment with monochromatic light of wavelength 6000 Å, the fringe width is 3 mm. If the distance between the screen and slits is increased by 50\% and the distance between the slits is decreased by 10\%, then the fringe width is
Two point charges +6 \(\mu\)C and +10 \(\mu\)C kept at a certain distance repel each other with a force of 30 N. If each charge is given an additional charge of -8 \(\mu\)C, the two charges
The work done by an ideal gas of 2 moles in increasing its volume from \( V \) to \( 2V \) at constant temperature \( T \) is \( W \). The work done by an ideal gas of 4 moles in increasing its volume from \( V \) to \( 8V \) at constant temperature \( \frac{T}{2} \) is
When 40 J of heat is absorbed by a monatomic gas, the increase in the internal energy of the gas is
The moments of inertia of a solid cylinder and a hollow cylinder of the same mass and same radius about the axes of the cylinders are \( I_1 \) and \( I_2 \). The relation between \( I_1 \) and \( I_2 \) is
In an inelastic collision, after collision the kinetic energy
A carrier wave of peak voltage 16 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?
When a transistor in CE configuration, the resistance connected at the collector circuit and base circuit are 10 \( \Omega \) and 8 \( \Omega \) respectively, if the AC current gain \( \beta_{{ac}} = 1.4 \), then the voltage amplification is
Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 Volt, calculate the output AC signal.
The rate of a radioactive disintegration at an instant is \( 10^8 \, {s}^{-1} \). The half-life of the radioactive sample is \( 3.3 \times 10^{12} \, {s} \). The number of radioactive atoms present in the sample at that instant of time is
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of a hydrogen atom is
In a series LCR circuit, the voltage across resistance of \( 2000 \, \Omega \) is 200 V and the resonant frequency is \( 400 \, {rad/s} \). The capacitance \( C \) value is 4 μF. At resonance, the voltage across \( L \) is
A helicopter has metallic blades with length 4 m extending outward from the central point and rotating at 3 rev/s. If the vertical component of Earth's magnetic field is 40 µT, then the emf induced between the blade tip and the central point is
A superconductor exhibits:

Two bar magnets A and B are identical and arranged as shown. Their lengths are negligible compared to the separation between them. A magnetic needle placed between the magnets at point P gets deflected through an angle \( \theta \) under their influence. The ratio of distances \( d_1 \) and \( d_2 \) is: