List of top Physics Questions asked in AP EAPCET

The magnitude of the electric field of a plane electromagnetic wave travelling in free space is \( E \). If \( \mu_0 \) and \( \varepsilon_0 \) are respectively permeability and permittivity of the free space, then the magnitude of magnetic field of the wave is
The force per unit length on a straight wire carrying current of 8 A making an angle of \(30^\circ\) with a uniform magnetic field of 0.15 T is
Charge 'Q' (in coulomb) flowing through a conductor in terms of time 't' (in seconds) is given by the equation \( Q = 3t^2 + t \). The current in the conductor at time \( t = 3 \, \text{s} \) is:
In a region, the electric field is given by $\vec{E} = (3\hat{i} + 5\hat{j} + 7\hat{k})\ \text{N/C}$. The electric flux through a surface of area $3\ \text{m}^2$ in the $yz$-plane is (in SI units):
If the ratio of specific heats of a gas at constant pressure and at constant volume is $\gamma$, then the number of degrees of freedom of the rigid molecules of the gas is
The fundamental limitation to the coefficient of performance of a refrigerator is given by
During adiabatic expansion, if the temperature of 3 moles of a diatomic gas decreases by \(50^\circ \text{C}\), then the work done by the gas is
(R - Universal gas constant)
A Carnot heat engine absorbs 600 J of heat from a source at a temperature of 127°C and rejects 400 J of heat to a sink in each cycle. The temperature of the sink is
When the mass attached to a spring is increased from 4 kg to 9 kg, the time period of oscillation increases by \(0.2\pi\) s. Then the spring constant of the spring is
For a particle executing simple harmonic motion, the ratio of kinetic and potential energies at a point where displacement is one half of the amplitude is
Two balls each of mass 250 g moving in opposite directions each with a speed 16 m/s collide and rebound with the same speeds. The impulse imparted to one ball due to the other is
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
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
The minimum length of an antenna to transmit a signal of frequency \( 3 \text{ kHz} \) is
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?
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
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
The focal length of a convex lens immersed in a liquid of refractive index 1.2 is \( f_1 \) and its focal length when immersed in another liquid of refractive index 1.25 is \( f_2 \). If the refractive index of the material of the lens is 1.5, then \( f_1 : f_2 = \)
The capacitance of a solid sphere of radius 18 cm 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