List of top Physics Questions asked in UP Board XII

An electron of energy 45 eV is revolving in a circular path in magnetic field of intensity \(9 \times 10^{-5}\) weber/m². Find the radius of the circular path.
Define 1 henry of self-inductance.
Write any two main features of electromagnetic waves.
What will be the effect on focal length and nature of convex lens of refractive index \( n = \frac{3}{2} \) dipped in a liquid of refractive index \( n = \frac{3}{2} \)?
Calculate the charge on nucleus \({}^7_{}N^{14}\) in coulomb.
A particle of mass \(m\) and charge \(q\) traverses distance \(d\) from rest in a uniform electric field \(E\). Prove that the velocity \(v\) attained by the particle is \( v = \sqrt{\frac{2qEd}{m}} \).
What is meant by threshold wavelength?
N-P-N transistor is arranged as in the following figure. This circuit is of
What will be the refractive index of a thin prism material if its refracting angle and angle of deviation are the same?
The equation \( \, {}^4_1H \rightarrow {}^4_2He + 2\beta^0 + Q \) represents
Among the following, which one is not the fundamental particle?
Resistance \( R \), inductance \( L \) and capacitor \( C \) are connected in series. The frequency of the alternating current source is \( n \) and resonant frequency is \( n_r \). Under which condition does the current lag behind the voltage?
The dielectric constant (k) of silver is