List of top Physics Questions asked in KEAM

CO$^{-}$ ion moving with kinetic energy of 20 keV dissociates into O$^{-}$ and C which move along the parent ion direction. Assuming no energy is released during dissociation, the kinetic energies of the daughters $(K.E.)_{O^-}$ and $(K.E.)_C$ are related as}

Which of the following particle when bombards on $^{65}\text{Cu}$ will turn into $^{66}\text{Cu}$}

If the rms value of sinusoidal input to a full wave rectifier is $V_0/\sqrt{2}$ then the rms value of the rectifier’s output is}

Consider a circular wire loop of radius R spinning about a diametrical chord which is perpendicular to a uniform magnetic field $(\vec{B}=B_0 \hat{k})$

If a magnet is dropped through a vertical hollow copper tube then

An electric motor when loaded has an effective resistance of $30\,\Omega$ and an inductive reactance of $40\,\Omega$. If the motor is powered by a source with maximum voltage of $420\,V$, the maximum current is

To transmit a signal of frequency, $\omega_m$, with a carrier frequency, $\omega_c$, in AM transmission, the bandwidth of the filter and amplifier is

Wavelength of the wave with $30$ MHz frequency is

Speech signal is in the range of

For a P-N junction diode

For a Zener diode

In an insulator, band gap is of the order of

The electric field portion of an electromagnetic wave is given by (all variables in SI units) $E = 10^{-4} \sin (6 \times 10^5 t - 0.01 x)$. The frequency $(f)$ and the speed $(v)$ of electromagnetic wave are}

It takes $4.6$ eV to remove one of the least tightly bound electrons from a metal surface. When monochromatic photons strike the metal surface, electrons having kinetic energy from zero to $2.2$ eV are ejected. What is the energy of the incident photons?

If copper and silicon pieces are heated, the resistance of

An electron, a neutron and an alpha particle have same kinetic energy and their de-Broglie wavelengths are $\lambda_e, \lambda_n$ and $\lambda_\alpha$ respectively. Which statement is correct about their de-Broglie wavelengths?

Huygens’ wave theory of light cannot explain

The phase velocity of a wave described by the equation $\psi = \psi_0 \sin (kx + \omega t + \frac{\pi}{2})$ is

For an ideal gas, the specific heat at constant pressure $C_p$ is greater than the specific heat at constant volume $C_v$. This is because

The direction of propagation of electromagnetic wave is along

Assume that a radio station is about $200$ km away from your location and the station operates at $972$ kHz. How long does it take for an electromagnetic signal to travel from the station to you and how many wave crests does it send out per second

In Young’s double slit experiment, if the separation between the slits is halved, and the distance between the slits and the screen is doubled, then the fringe width compared to the unchanged one will be

Which of the following statements is correct?

A man of mass $60$ kg climbed down using an elevator. The elevator had an acceleration $4$ m/s$^2$. If the acceleration due to gravity is $10$ m/s$^2$, the apparent weight on his way down is

A uniform rod of length $1$ m and mass of $2$ kg is attached to a side support at $O$ as shown in the figure. The rod is at equilibrium due to upward force $T$ acting at $P$. Assume the acceleration due to gravity as $10$ m/s$^2$. The value of $T$ is