List of top Physics Questions asked in KEAM

The final result of the sum of the numbers 523.32, 1.21524 and 107.3 rounded to correct significant figures is
The technonlogy related with the Bernoulli's principle is used in
The dimensional formula for the power of a lens is
The radius of a circular plate is 1.05 m. Its area (in $m^2$) up to correct significant figures is
Two materials A and B having respective work functions 3 eV and 4 eV are emitting photoelectrons of same maximum kinetic energy of 1eV. If the wavelength of incident light on A is 500 nm, then that of light incident on B is
A transistor amplifier along with a tank circuit with positive feedback will act as
In p-type semiconductors
If the mass numbers of two nuclei are in the ratio 3: 2, then the ratio of their nuclear densities is :
The ratio of the total energy E of the electron to its kinetic energy K in hydrogen atom is
1018 fissions per second is required for producing power of 300 MW in a nuclear power station. To increase the power output to 360 MW the additional number of fissions required per second is
During $ẞ^{-}$ decay of a radioactive element there is an increase in its
If the momentum of an α-particle is half that of a proton, then the ratio between the wavelengths of their de-Broglie waves is
If $θ_p$ is the polarizing angle for a glass plate of refractive index μ and critical angle $θ_c$, then
In Young's double-slit experiment, two different light beams of wavelengths $λ_1$ and $λ_2$ produce interference pattern with band widths $β_1$ and $β_2$ respectively. If the ratio between $β_1$ and $β_2$ is 3:2, then the ratio between and is
An object is placed at 10 cm in front of a concave mirror. If the image is at 20 cm from the mirror on the same side of the object, then the magnification produced by the mirror is
The apparent depth of a needle lying in a water beaker is found to be 9 cm. If water is replaced by a liquid of refractive index 1.5, then the apparent depth of needle will be (μ of water is 4/3)
Fresnel distance for an aperture of size a illuminated by a parallel beam of light of wavelength λ, deciding the validity of ray optics is
If one cell is connected wrongly in a series combination of four cells each of e.m.f. 1.5 V and internal resistance of 0.5 Ω, then the equivalent internal resistance of the combination is
In an electromagnetic wave, the oscillating electric and magnetic field vectors are oriented in
Electromagnetic waves against their detection devices are matched below. The mismatch is
The total intensity of earth's magnetic field at the poles is 7 units. Its value at the equator is
Among vadous circuits coDstructed with rcsistor _R, inductor _L and capacitor C, the cicuit that gives maximum power dissipation is
If air core is replaced by an iron core in an inductor, its self-inductance is increased from 0.02 mH to 40 mH. The relative permeabiliry of iron is
If $B_c$ is the magnetic induction at the ceflte ofa circular coit carrying curreflt, then the magnetic induction at a poitrt oo the axis of the coil at a distance equal to the radius of the coil is
The hard ferromagnetic material among the following is