List of top Physics Questions asked in TS EAMCET

The velocity of the photoelectron (\(in~ms^{-1}\)) emitted when a smooth surface of a metal is made to strike with a photon of wavelength \(4\times10^{-7}m\) (\(W_{0}\) of metal \(=2.13~eV\); \(1eV=1.6\times10^{-19}J\); \(h=6.6\times10^{-34}Js\); \(m_{e}=9.1\times10^{-31}kg\))

For an amplitude modulated wave, if the maximum amplitude is \(400%\) more than its minimum amplitude, then the modulation index is

If the activities of a radioactive substance at times \(t=0\) and \(t=3T\) are A and B respectively, then the activity of the substance at a time \(t=9T\) is

In terms of Planck's constant (h), permittivity of free space \((\epsilon_{0})\), mass of the electron (m) and charge of the electron (e), the de Broglie wavelength associated with the electron in the second orbit of hydrogen atom is

When the input voltage given to the combination of two common emitter amplifiers connected in series is \(20\ mV\), then the output voltage is \(30\ V\). If the voltage gain of one amplifier is \(25\), then the voltage gain of the other amplifier is

An AND gate, an OR and a NAND gate are connected as shown in the figure. If the inputs are \(A=0\), \(B=1\) and \(C=0\), then the outputs \(y_{1}\), \(y_{2}\), \(y_{3}\) are respectively

If the masses of proton and neutron are \(m_{p}\) and \(m_{n}\) respectively, the experimental masses of \({}_{2}He^{4}\) and \({}_{8}O^{16}\) nuclei are \(M_{1}\) and \(M_{2}\) respectively, then

Two long straight parallel wires P and Q carrying currents of 10 A and 20 A respectively in the same direction are placed in air with a separation of 10 cm between them. Another long straight wire R carrying a current of 5 A in the opposite direction is placed between the wires P and Q and parallel to them at a distance of 5 cm from wire Q. Then the magnitude of the net force acting on wire R per unit length is

The mean radius of a Rowland ring is 12 cm and it has 3000 turns of wire wound on its ferromagnetic core of relative permeability 500. If the magnetic field inside the core is 5 T, then the magnetizing current is

The amplitude of the magnetic field of a plane electromagnetic wave travelling along positive x-axis in vacuum is 6 mT. A particle of charge 5 \(\mu\)C is travelling with a velocity of \(6\times10^{5}ms^{-1}\) along the positive y-axis. If the magnetic field is oriented along positive z-axis, then the maximum force exerted on the particle due to electric field of the wave is

Photons of energy 4.2 eV are incident on a photosensitive material of work function 1.7 eV. If the emitted photoelectrons enter normally into a uniform magnetic field of \(\sqrt{2}\times10^{-4}T\), then the largest radius of the circular path described by the photoelectrons is nearly

In an ac circuit, if the rms value of current is 2 A and the wattless current is \(\sqrt{3}\) A, then the power factor of the circuit is

If the energy stored in an inductor is 18 mJ when a current of 3 A is passed through it, then the magnetic flux linked with the inductor is

If the number density of free electrons in a copper wire is $8.5\times10^{22}cm^{-3}$ and the relaxation time of free electrons in the wire is $2.25\times10^{-14}s$, then the electrical conductivity of copper is (Mass of the electron $=9\times10^{-31}$ kg and charge of the electron $=1.6\times10^{-19}C$)}

A parallel plate capacitor consists of two circular plates of radii 5 cm and 10 cm. The centres of the two plates are kept on the same straight line with a separation of 'd' and the plates are completely immersed in a liquid of dielectric constant 18. If the capacitance of the capacitor immersed in the liquid is 250 pF, then the value of 'd' is

A part of an electric circuit is shown in the figure. If the reading of the voltmeter is 100 V and the resistance of the voltmeter is 200 $\Omega$, then the value of the resistance $R_{2}$ is}

The magnetic field required to accelerate deuterons in a cyclotron operated at a frequency of 28 MHz is (Mass of proton $=1.67\times10^{-27}kg$)

At a distance of 20 cm from the centre of a charged conducting sphere of radius 10 cm, the electric field due to the sphere is $9000NC^{-1}$ If an electric charge of 3 µC is placed at a distance of 30 cm from the centre of the sphere, then the electrostatic force acting on the charge is}

The thermodynamic variable on which the average kinetic energy of a gas molecule depends is

If a source of sound initially at rest is moving away from a stationery observer with an acceleration of $11~ms^{-2}$, then the time taken for the frequency of sound heard by the observer to become 10% less than the frequency of source is (Speed of sound in air $=330~ms^{-1}$)}

If a 200 cm long steel rod clamped at its middle is vibrated in its fundamental mode with a frequency of 1.25 kHz, then the speed of longitudinal waves in the rod is

Keeping the length of an astronomical telescope constant in normal adjustment, to increase its magnification from 4 to 9, the focal length of the eyepiece is to be decreased by 10 cm. The length of the telescope is

When an object is placed at a distance of 40 cm from a convex lens, a real image is formed at a distance V from the lens. If the convex lens is replaced with a concave lens of same focal length, then the change in the position of the image is