List of top Physics Questions asked in KEAM

The velocity of light in a medium of relative permittivity 2 and relative permeability 4.5 is (velocity of light in free space is c)
Three identical resistors are connected in the form of a triangular mesh ABC. If a battery of 12 V is connected across AB, then the ratio of the current flowing through AB to that through ACB is
If \(\tau\) is the average time between any two successive collisions for the electrons in a metal wire under the application of an electric field E, then the mobility \(\mu\) of the electrons is
The maximum current drawn from a battery of 12 V with internal resistance of \(0.5 \Omega\) is
According to Biot-Savart's law, the magnetic field B is
If the torque acting on an electric dipole when placed at an angle \(30^{\circ}\) with the direction of a uniform electric field is \(\tau\), then the torque acting on the same dipole when placed in the same field at an angle \(45^{\circ}\) is
Two identical isolated capacitors A and B are charged so that each has a charge of 4C. If a charge of \(-2C\) is added to A and \(+2C\) to B, then the ratio of respective potentials is
A conductor with an air core cavity inside, is charged to attain the surface charge density of \(\sigma\). If E is the magnitude of electric field and V is the potential, then inside the cavity

The frequency of the periodic wave for the following figure is 


 

If a diode is forward biased, then the
If the volume of nucleus having mass number 2 is V, then that for the nucleus having mass number 8 is
The simple microscope having a lens of focal length 5 cm gives the magnification of (least distance of distinct vision \(= 25\) cm)
The process that releases neutrons from the nucleus is
The vibrations of atoms and molecules produce electromagnetic radiation in the region of
If a current of 1 A is passed through a 1 m long solenoid of 7000 turns, the magnetic field produced at the middle of the solenoid is
The magnetic field at the centre of a current loop of radius \(r\) carrying a current \(I\) is
Monochromatic ray of light incident on a glass prism does not produce the phenomenon of
The energy dissipated per unit time by a wire of resistance \(2R\) connected to a battery of voltage \(2V\) is
The a.c circuit exhibiting the phenomenon of resonance has/have the circuit element(s)
For a diatomic gas molecule the value of \(C_p\) in \(J mol^{-1} K^{-1}\) is \((R = 8.2 J mol^{-1} K^{-1})\)
The electrostatic force between two point charges at a distance of separation \(d\) is \(F\). If one of the charge is moved away by a distance \(d/2\) then the force between them is
The resistance of a wire of length \(l\) and cross sectional area \(A\) is \(R\). The resistance of another wire of the same material of length \(3l\) and cross sectional area \(\frac{A}{3}\) is
A steel rod of length 1 m is clamped at its middle. If the fundamental frequency of vibrations is 3 kHz, then the speed of sound in steel is
The speed of water flowing out from the small opening at a depth of \(h\) from the surface of water in a large tank is
Young's modulus and shear modulus can be defined only in