List of top Questions asked in KEAM

The angular momentum of the electron revolving in the 2nd orbit is
In the nuclear process, 1122Na → 1022Ne + e+ + νe, then X is
In a semiconductor crystal, the total number of electrons in the outer shell is 4N . At absolute zero, the number of energy states of valence and conduction band are respectively
The flux linked with a coil at any instant is given by \( \Phi = 5t^2 - 25t - 150 \) (in SI units). The emf induced in the coil at \( t = 2 \) s is
If the frequency of an electromagnetic wave is 2 MHz, then the time period of oscillation of the accelerated charge is
The eye defect astigmatism can be corrected by using a
If an electron moves with a velocity \( v \) in a magnetic field \( B \), the magnetic force on the electron is maximum when the angle between \( v \) and \( B \) is
The intensity of a polarized light can be controlled by a second polarizer from
If the amplitude of the wave \( y = 3\sin(3x - 5t) + A\cos(3x - 5t) \) m is 5 m, the value of A is
For the oscillations of a spring with spring constant k, the false statement is
In dielectrics, polarization is the dipole moment per unit
The magnetic moment of an electron revolving in an orbit of 0.5 m radius with a velocity of \( 8 \times 10^7 \, \text{m/s} \) is (in \( \text{Am}^2 \))
When a current of 2 A flows through a wire for 2.5 s, the amount of heat liberated is 20 J. The resistance of the wire is
The energy density of the electric field \( 2 \, \text{V/m} \) in a capacitor \( C \) is \( \varepsilon_0 \) is the permittivity of free space
A carbon resistor has a tolerance of 20\%. As per the colour codes of resistors, the last band in that resistor is
For smaller deformations, stress is directly proportional to the strain for any material. Then the constant of proportionality is called as its
Angular momentum of a particle will not be zero, if the
If Q1 and Q2 are respectively the heat supplied and expelled by a system at a constant temperature, then the work done by the system is
Which one of the following principles helps to explain the flow of blood in an artery?
An astronaut experiences weightlessness in space satellite because
If the position of the particle as a function of time \( t \) is \( \vec{r} = 8t \hat{i} + 3t^2 \hat{j} + 3 \hat{k} \, \text{m} \), then the acceleration of the particle is (in \( \text{m/s}^2 \))
Three particles of equal mass lie at distances of 1 cm, 2 cm, and 3 cm from the origin. The distance of their center of mass from the origin is
A bullet of 10 g mass is fired at a speed of 50 m/s by a gun of 2 kg mass. The recoil speed of the gun (in m/s) is
The work done to lift a 60 kg mass to a height of 5 m from the ground is (g = 10 m/s\(^2\))
The force acting on the particle of 0.2 kg mass whose displacement is described by the equation \( x = 3t + 7t^2 \, \text{m} \)