List of top Physics Questions

The correct plot of the magnitude of magnetic field $\vec{B}$ $vs$ distance $r$ from centre of the wire is, if the radius of wire is $R$
The correct relation between joule and erg is
The core of electromagnet is made of soft iron, because a) the susceptibility of soft iron is very high b) coercivity of soft iron is very low
The constant $k$ in Coulombs law depends on
The conductivity of intrinsic semiconductors can be increased by adding a suitable impurity. This process is called $(P)$. This can be done with an impurity which is $(Q)$ rich or deficient as compared to the semiconductor. Such impurities introduce $(R)$ defects in them. Electron rich impurities result in $(S)$ type semiconductors while electron deficit impurities result in $(T)$ type semiconductors.
The conductivity of a superconductor is
The conduction current is same as displacement current when source is
The concept of displacement current was given by
The comparative strength of macroscopic and microscopic fundamental forces in increasing order is
The coefficients of self induction of two coils are respectively 2 mH and 3 mH. They are coupled so as to oppose each other. What will be their self inductance if their mutual inductance is 1 mH?
The coil of the ballistic galvanometer oscillates due to :
The coefficient of linear expansion of a solid depends upon
The coefficient of performance of refrigerator, whose efficiency is $25\%$ is
The charge on an electron was calculated by
The characteristic's of light which are changed during modulation is/are
The centre of mass of a non uniform rod of length L whose mass per unit length $\lambda=\frac{Kx^2}{L},$ Where k is a constant and x is the distance from one end is :
The cause of the fractional atomic weight of elements is
The capacitors of capacitance $4\,\mu F$ and $6\,\mu F$ are connected in series. A potential difference of $500\, volt$ is applied to the outer plates of capacitor system. Then the charge on each capacitor is equal to
The capacity of a storage cell is expressed in :
The capacitance of a parallel plate capacitor is $5\,\mu F$. When a glass slab is placed between the plates of the capacitor, its potential difference reduces to $1/8$ of the original value. The thickness of the slab is equal to the separation between the plates. The value of the dielectric constant of glass is
The capacitance of a conductor in vacuum is $10\,F$. If it is put in a medium of relative permittivity $5$, the capacitance will be :
The breakdown in a reverse biased $p-n$ junction diode is more likely to occur due to
The breaking force for a wire of diameter D of a material is F. The breaking force for a wire of the same material of radius D is
The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:
The blades of a windmill sweep out a circle of area $A$. If the wind flows at a velocity $v$ perpendicular to the circle, then the mass of the air of density $\rho$ passing through it in time $t$ is