List of top 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}

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 $(\vec{B}=B_0 \hat{k})$

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

Wavelength of the wave with $30$ MHz frequency is

For a P-N junction diode

For a Zener diode

In an insulator, band gap is of the order of

Speech signal is in the range of

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

What wavelength must electromagnetic radiation have if a photon in the beam has the same momentum as an electron moving with a speed $1.1 \times 10^5$ m/s (Planck’s constant $= 6.6 \times 10^{-34}$ Js, rest mass of electron $= 9 \times 10^{-31}$ kg)?

If copper and silicon pieces are heated, the resistance 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?

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

Which of the following statements is correct?

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

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

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

A capillary tube of radius $0.5$ mm is immersed in a beaker of mercury. The level inside the tube is $0.8$ cm below the resonance and angle of contact is $120^\circ$. What is the surface tension of mercury if the mass density of mercury is $\rho = 13.6 \times 10^3$ kgm$^{-3}$ and acceleration due to gravity is $g = 10$ m/s$^2$?}

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

Initially a beaker had $100$ g of water at temperature $90^\circ$C. Later another $600$ g of water at temperature $20^\circ$C was poured into the beaker. The temperature, $T$, of the water after mixing is