List of top Physics Questions

The dimensional formula for Magnetic Moment of a magent is
The dimensional formula for acceleration, velocity and length are $a?^{-2}, \,a?^{-1}$ and $\alpha\gamma$. What is the dimensional formula for the coefficient of friction ?
The dielectric strength of air is $2.0\times10^6 N/C$. The largest charge that a metallic sphere of $3 \,mm$ radius can hold is
The dielectric strength of a medium is $2\,kVmm^{-1}$ . What is the maximum potential difference that can be set up across a $50\,pm$ specimen without puncturing it.
The diameter of the pupil of human eye is about $2 \,mm$. Human eye is most sensitive to the wavelength of $555\, nm$. The limit of resolution of human eye is
The device which produces highly coherent sources is
The density of water at the surface of the ocean is $\rho$ and atmospheric pressure is $p _{0}$. If the bulk modulus of water is $K$, what is the density of ocean water at a depth where the pressure is $n p_{0}$ ?
The density of air at N.T.P. is 1.293 gm/lit. If the pressure is tripled keeping its temperature constant its density becomes
The density of core of a planet is $\rho_1$ and that of the outer shell is $\rho_2$. The radii of core and that of the planet are $R$ and $2R$ respectively. Gravitational acceleration at the surface of planet is same as at a depth. The ratio between $\frac{\rho _{1}}{\rho _{2}}$ is
The definition of current gain is given by
The de Broglie Wavelength of a molecule of thermal energy KT (K is Boltzmann constant. and T is absolute temperature) is given by
The de Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is $v_{e}=\frac{c}{100}$ then
The decay constant of radium is $ 4.28 \times 10^{-4} $ per yr .Its half-life is approximately
The current passing through a choke coil of 15 henry is decreasing at the rate of 0.2 ampere per second. The e.m.f. developed across the coil :
The current amplification factor $\alpha$ of a common base transistor and the current amplification factor $\beta$ of a common emitter transistor are not related by
The current in $ac$ circuit will be wattless when :
The curie weiss law is obeyed by iron
The critical angle for light going from a medium in which wave length is 4000A$^\circ$ to medium in which its. wavelength is 6000A$^\circ$ is
The critical temperature of the gas is the temperature
The coupling coefficient of the perfectly coupled coils is :
The counting rate observed from a radioactive source at t = 0 seconds was 1600 counts per second and t = 8 seconds it was 100 count per second. The counting rate observed, as counts per second at t = 6 seconds will be :
The count rate from $100\, cm^{3}$ of a radioactive liquid is $c$. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be $c/10$ after three half-lives. The volume of the remaining liquid, in $cm^{3}$, is
The correct statement variation of the conductivity of semiconductors like Ge and Si is given by
The correct statement of the law of equipartition of energy is
The correct relation of the following is