List of top Questions asked in KEAM

Heat supplied to a block of ice at \(0^{\circ}C\) converts it into steam at \(100^{\circ}C\). The curve that represents this change of state is.
The work function of a material that has the threshold frequency of \(5 \times 10^{14} \, Hz\) is (\(h = 6.626 \times 10^{-34}\) Js).
The energy of the electron in third excited state of the hydrogen atom is
The expected mass of \({}^{12}_{6}C\) nucleus is (Mass of neutron is 1.00866 u; Mass of proton is 1.00727 u).
If the voltage applied to a diode having forward bias resistance of 1 $\Omega$ is changed from 0.6 V to 0.9 V, the change in current in it is
5 thin lenses each of 20 cm focal length are placed in contact with each other. The net power of this lens combination is
Among the following magnetic materials, the diamagnetic material is
If the force due to sun's radiation on surface area of \(cm^{2}\) is about \(9 \times 10^{-9} N\), then the radiation pressure of the sun's radiation (in \(Nm^{-2}\)) is.
In a cyclotron, the frequency of revolution of a charged particle of energy E moving in a magnetic field is f. If the energy of the charged particle in it is doubled, then the frequency of revolution of the charged particle is
If an emf of 2 V is induced in a coil in 6 s, then the change of flux (in Wb) in the coil during the time is
In Young's double slit experiment, monochromatic light of 500 nm falls on the slits separated by a distance of 2 mm. If the screen is 2 m away from the source, then the fringe width is
The drift velocity of electrons in a linear conductor of given length under a potential can be doubled by
An organ pipe open at both the ends has its fundamental frequency 200 Hz. If one end of it is closed and the other end is kept open, the frequencies produced by it are
If the potential difference between two points separated by a distance in a uniform electric field of 800 \(NC^{-1}\) is 16 V, then the distance of separation (in cm) is.
When filled with a dielectric, the capacitance C of a capacitor changes by 2C. Then the dielectric constant of the dielectric is
When an electric potential of 200 V is maintained between the ends of a conductor, a current of 3 A flows through it. The amount of heat energy dissipated in the time interval 25 s is
Two different syringes having radii in the ratio 1: 5 are applied with same pressure. The forces acting on these syringes are in the ratio
Which one is INCORRECT?
The displacement and acceleration of a particle oscillating simple harmonically are respectively 3.0 m and \(48.0 \, ms^{-2}\). The angular frequency of the particle is (in \(s^{-1}\)).
If the diatomic molecule is non-rigid, then its molar specific heat capacity at constant volume is
A ball falling from a height of 20 m hits a floor and bounces back to a height of 17 m. The percentage of energy lost by the ball during the impact is
When a satellite moves from the farthest stable orbit to the nearest stable orbit towards the earth, its gravitational potential energy
When two perpendicular forces 3 N and 4 N act on a body at rest, it is accelerated to \(2 \, ms^{-2}\). The mass of the body is.
In a steam engine, the flywheel is used to resist
When the total external force acting on a moving system is zero, the velocity of the center of mass