List of top Physics Questions

The electrical conductivity of semiconductors :
The electric field strength due to a circular loop of charge of radius $R$ and linear density of charge $\lambda$ at its centre is proportional to :
The electric field components in the given figure are $E_x = \alpha x^{1/2}$, $E_y = E_z = 0$ in which $\alpha = 800\, N\, C^{-1}\, m^{-1/2}$. The charge within the cube if net flux through the cube is $1.05\, N\, m^2\,C^{-1}$ (assume $a = 0.1\, m$)
The electric field intensity at a point $P$ due to point charge $q$ kept at point $Q$ is $24 \,N \,C^{-1}$ and the electric potential at point $P$ due to same charge is $12\, J \,C^{-1}$. The order of magnitude of charge $q$ is
The electric field strength at a distance r from a charge q is E. What will be electric field strength if the distance of the observation point is increased to 2 r?
The electric current passing through a metallic wire produces heat because of
The electric charge, in uniform motion, produces
The edge of an aluminium cube is $10 \,cm$ long. One face of the cube is firmly fixed to a vertical wall. $A$ mass of $100 \,kg$ is then attached to the opposite face of the cube. The vertical deflection of this face is (Shear modulus of aluminium = $25 GPa$, $g = 10\, m$ $s^{-2}$)
The earth moves in an elliptical orbit with the sun S at one of foci as shown in the figure. Its rotational kinetic energy is maximum at the point
The dynamic lift of an aeroplane is based on
The distance of distinct vision of a person is 50 cm. He wants to read a book place at 25 cm. What should be the focal length of the spectacles?
The displacement of a particle varies with time according to the relation $y = a \,sin\,\omega t + b\, cos \,\omega t$.
The displacement of a progressive wave is represented by $y=A\,sin\left(\omega t-kx\right) $ where $x$ is distance and $t$ is time. The dimensions of $\frac{\omega}{k}$ are same as those of
The displacement of a particle from its mean position (in metre) is given by $y=0.2 \, sin (10\pi t+1.5 \pi) cos (10\pi t+1.5 \pi) $ The motion of the particle is
The direction of the induced e.m.f. is determined by
The direction of ray of light incident on a concave mirror is shown by $PQ$ while directions in which the ray would travel after reflection is shown by four rays marked $1, 2, 3$ and $4$. Which of the four rays correctly shows the direction of reflected ray?
The direction of magnetic lines of force of a bar magnet is
The dimensions of the emf of a source of current are that of
The dimensions of ( velocity )$^2$ /radius are the same as that of
The dimensional formula for pressure gradient is
The dimensional formula for strain energy density is
The dimensions of (force constant + mass)$^{1/2}$ are the same as that of
The dimensional formula for amplitude of SHM is:
The dimensional formula for Magnetic induction is
The dimensional formula for magnetic moment is