List of top Physics Questions asked in KEAM

If the stopping potential in a photoelectric experiment is measured to be 1.82 V, the maximum speed of the emitted electrons, in ms\(^{-1}\), is
(mass of the electron = \(9.1\times10^{-31}\) kg)}

An object is placed at 30 cm from a convex lens of focal length 20 cm. If the object is moved towards the lens by 5 cm, then the image is shifted by}

Light of wavelength 500 nm falls on a single slit of width 0.1 mm. The angular position of the first minimum is}

If an EM wave travels in a medium with \(\varepsilon_r = 4\), \(\mu_r = 1\), its speed (in ms\(^{-1}\)) in terms of \(c\) (\(c =\) velocity of light in free space) is}

A string of length \(L\) fixed at both ends vibrates in third harmonic. The distance between consecutive nodes is}

A particle executes SHM with a time period \(T\). If its maximum acceleration is doubled keeping the amplitude constant, its new time period is}

If a thin uniform circular ring and a thin uniform circular disc have the same mass and radius, then the ratio of their moments of inertia about their central axes normal to their planes is}

0.2 kg ball strikes a wall with velocity \(10\,ms^{-1}\) and rebounds with \(8\,ms^{-1}\). The impulse delivered by the ball is}

A particle of mass \(m\) tied to a string of length \(r\) is whirled in a vertical circle. Its minimum speed at the bottom is}

Two particles of masses \(m\) and \(2m\) kept 1 m apart are attracted to each other by gravitational force. The acceleration of their centre of mass is \((G = \text{gravitational constant})\)}

Two particles A and B at rest initially, start to move simultaneously along the same straight line, A with constant velocity \(5\,ms^{-1}\) and B with constant acceleration \(2\,ms^{-2}\). Then the time after which B overtakes A is}

The power of a motor pump delivering water at a constant speed through a hose of radius \(r\) is \(P\). If the radius of the hose is doubled, then the power of the pump becomes}

A particle moves under a force \(F = 3x^2\) N. The work done by the force on the particle in displacing it from \(x=0\) to \(x=2\text{ m}\) is}

The velocity (\(v\)) – time (\(t\)) graph of a particle cuts the time axis, then the particle}

A $250$ watt bulb emits monochromatic light of wavelength $198.78$ nm. How many photons are emitted by the bulb per second? \ (Planck’s constant = $6.626 \times 10^{-34}$ J s and velocity of light = $3 \times 10^8$ ms$^{-1}$)

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

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

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

The logic gate that performs the operation of an inverter is

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

The focal length of a plane mirror is

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

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

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

The binding energy per nucleon is maximum for the nucleus