List of top Physics Questions asked in Assam Board Class 12

Monochromatic light of frequency $5.0 \times 10^{14}$ Hz passes from air into a medium of refractive index 1.5. Find the wavelength of the light (i) reflected, and (ii) refracted at the interface of the two media.
Plot a graph showing the variation of current with voltage for the material GaAs. On the graph, mark the region where: (a) resistance is negative, and (b) Ohm's law is obeyed.
Find the temperature at which the resistance of a wire made of silver will be twice its resistance at $20^\circ$C. Take $20^\circ$C as the reference temperature and temperature coefficient of resistance of silver at $20^\circ$C = $4.0 \times 10^{-3\ \text{K}^{-1}$.}
Consider a neutron (mass $m$) of kinetic energy $E$ and a photon of the same energy. Let $\lambda_n$ and $\lambda_p$ be the de Broglie wavelength of neutron and the wavelength of photon respectively. Obtain an expression for $\dfrac{\lambda_n{\lambda_p}$.}
In the four regions, I, II, III and IV, the electric fields are described as: Region I : $E_x = E_0 \sin (kz - \omega t)$
Region II : $E_x = E_0$
Region III : $E_x = E_0 \sin kz$
Region IV : $E_x = E_0 \cos kz$
The displacement current will exist in the region:
Why is the density of a nucleus much more than that of an atom?
Show that the density of the nuclear matter is the same for all nuclei.
Ge is doped with As. Due to doping,
A galvanometer of resistance $G\,\Omega$ is converted into an ammeter of range $0$ to $1\,A$. If the current through the galvanometer is $0.1%$ of $1\,A$, the resistance of the ammeter is:
The waves associated with a moving electron and a moving proton have the same wavelength \( \lambda \). It implies that they have the same :
The transition of electron that gives rise to the formation of the second spectral line of the Balmer series in the spectrum of hydrogen atom corresponds to:
A loop carrying a current I clockwise is placed in x - y plane, in a uniform magnetic field directed along z-axis. The tendency of the loop will be to:
In a full-wave rectifier, the current in each of the diodes flows for:
(iii) In a full-wave rectifier:
Ten capacitors, each of capacitance $1\,\mu F$, are connected in parallel to a source of $100\,V$. The total energy stored in the system is equal to: