List of top Physics Questions asked in KEAM

The focal length of a plane mirror is

The ground state energy of hydrogen atom is -13.6 eV. The energy of the second excited state is

The width of the depletion layer of a p-n junction diode

Ripple frequency in full-wave rectifier of input frequency $f$ is:

In an n-p-n transistor, the majority charge carriers in the emitter are

The logic gate that performs the operation of an inverter is

The de Broglie wavelength of a particle of mass m and kinetic energy E is given by

In Young's double slit experiment, if the distance between the slits is halved and the distance between the slits and the screen is doubled, the fringe width will become

In a hydrogen atom, the radius of the $n^{th}$ Bohr orbit is proportional to

The phenomenon of total internal reflection occurs when a ray of light travels from

The binding energy per nucleon is maximum for the nucleus

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 40 cm. The power of the combination is

A dip needle vibrates in a vertical plane perpendicular to the magnetic meridian. The time period of vibration is

The core of a transformer is laminated to reduce

The electromagnetic waves used in radar systems for aircraft navigation are

The sensitivity of a moving coil galvanometer can be increased by

In an AC circuit containing only a capacitor, the current

The ratio of the electric force to the gravitational force between an electron and a proton separated by a distance r is approximately

Potentiometer is an ideal instrument for measuring voltage because

When two capacitors of capacities $C_{1}$ and $C_{2}$ are connected in parallel, the equivalent capacitance is

The electric potential at a point on the axis of an electric dipole at a distance r from its centre is proportional to

A wire of resistance R is stretched to double its length. Its new resistance will be

The drift velocity of electrons in a conductor is of the order of

The magnetic field at the centre of a circular current carrying coil of radius R is B. The magnetic field at a distance R from the centre on the axis of the coil is

The frequency of a simple pendulum is f. If its length is increased by four times, its frequency will become