List of top Physics Questions asked in AP EAPCET

The minimum energy gap of a semi-conductor used in manufacturing LED is
Work function of a metallic surface is 5.01 eV. When a light of wavelength 2000Å falls on the metallic surface, it emits photo electrons. The potential difference required to stop the fastest photo electron is? (in Volt)
Binding energy per nucleon of deuteron and Helium nuclei are 1.1 MeV and 7 MeV respectively. If a single Helium nucleus was formed by adding two Deuterons, the energy released is
The energy of spectral line of lowest frequency in Lyman series of $Li^{2+}$ spectrum is x J. The energy of second spectral line in Balmer series of $He^{+}$ spectrum is y J. The ratio of x and y is
In the given circuit, the readings of voltmeters $V_{1}$ and $V_{2}$ are 300 V each. The reading of voltmeter $V_{3}$ and ammeter A are respectively
A wire carrying current I and other parallel wire carrying current 2I in the same direction produces a magnetic field B at the midpoint between them. Then the magnitude of field at the same point, when the 2I wire is switched off
A 2 m long solenoid with diameter 2 cm and 2000 turns has a secondary coil of 1000 turns wound closely near its midpoint. The mutual inductance between the two coils is
The earth's magnetic field at a certain place has a total strength of 0.5 Gauss and the horizontal component of 0.3 Gauss. Then the angle of dip at that place is
Electromagnetic waves do not transport
A moving coil galvanometer has a resistance of $50\,\Omega$ and gives a full-scale deflection for a current of $2 \text{ mA}$. To convert it into a voltmeter reading up to 10 V, the required series resistance to be connected is
The potential difference between points A and B of adjoining figure is
Two identical balls each of mass $\frac{40}{3}$ g carry equal and opposite charge. They are suspended from a horizontal plate by silk threads each of length 1 m with a separation of 1.5 m between points of suspension. At equilibrium, if the distance between the balls is 30 cm then magnitude of charge on each ball is (Acceleration due to gravity $= 10 \text{ ms}^{-2}$)
A conducting sphere of radius 4 cm is charged such that it has a potential of 5V on its surface. Then the potential at a point which is at a depth of 1 cm from its surface is
In a Young's double slit experiment, the intensity at a point where the path difference is $\frac{\lambda}{6}$ ($\lambda$ being the wavelength of the light used) is $I$. If $I_{0}$ denotes the maximum intensity, $\frac{I}{I_{0}}$ is
A potentiometer wire is 10m long and has a resistance of $18\,\Omega$. It is connected to a battery of emf 5V and internal resistance $2\,\Omega$. Calculate the potential gradient along the wire.
A parallel plate capacitor with dielectric is charged completely and the battery is then disconnected. Now if the dielectric is slowly pulled out of the capacitor then the variation of the potential (V) of the capacitor with respect to the length (x) of the dielectric pulled out is represented by

In which of the following thermodynamic process, the internal energy of system remains constant
Two identical strings A and B of same material are having tensions $T_{A}$ and $T_{B}$ respectively. If their fundamental frequencies are 450 Hz and 300 Hz, then $T_{A}/T_{B}$ is
For the same angle of incidence, the angles of refraction of light ray in different media A, B, C are $35^{\circ}$, $25^{\circ}$, $15^{\circ}$. If $V_{A}, V_{B}, V_{C}$ are velocities of light in A, B, C media respectively, then
The refractive index of water is $\frac{4}{3}$ and that of glass is $\frac{3}{2}$. The refractive index of glass with respect to water is
The rms speed of oxygen molecule at some temperature is $150 \text{ ms}^{-1}$. Then the rms speed of hydrogen molecule at the same temperature is
A Carnot engine of 50 % efficiency takes heat from a source of 400 K. To change efficiency to 70 % without changing the sink temperature, the new temperature of source should be (nearer to)
A 1200 kg artificial satellite is in an orbit of radius $2R_{E}$ about the earth. The energy required to transfer it to an orbit of radius $3R_{E}$ is ($g=10\text{ms}^{-2}$, $R_{E}=6400 \text{ km}$)
An earthen pitcher containing 9.5 kg of water loses one gram of water per minute due to evaporation. If water equivalent of pitcher is 0.5 kg. The time required to cool the water in pitcher from $30^{\circ}\text{C}$ to $28^{\circ}\text{C}$ is (Neglect radiation effect and Take latent heat of vaporization 500 cal $\text{g}^{-1}$)
A particle starting from the origin executes simple harmonic motion along x-axis. Its velocity at any instant t is given by $v_{x}=22 \cos(\frac{\pi t}{2}) \text{ cm s}^{-1}$. The total distance covered by the particle in time $t=4.5 \text{ sec}$ is