List of top Physics Questions asked in Bihar Board Class XII

In resonance condition, the frequency of L-C circuit is
An electric dipole is held in a uniform electric field. The dipole is aligned parallel to the electric field. Find the work done in rotating it through an angle of 180°.
What is Curie temperature?
The graph between voltage \( V \) of a conductor and current \( I \) is a straight line, which makes an angle \( \theta \) with the y-axis (which represents \( I \)). The resistance of the conductor will be
Equivalent energy of 1 amu is
What is photoelectric effect? What are the laws of photoelectric effect? Explain this law given by Einstein.
What is equivalent lens? Derive an expression for equivalent focal length of two lenses of focal lengths \(f_1\) and \(f_2\) kept at a distance \(d\).
Define wavefront and secondary wavelets. Verify the law of reflection on the basis of Huygens’ wave theory.
Define self-inductance and mutual inductance. Find an expression for mutual inductance of two coaxial solenoids.
Write two properties of beta rays.
Explain magnetic moment. Write its SI unit.
Mention two different modes of propagation used in communication system.
Explain Bohr's stable orbit.
Define volume density of charge. Write its SI unit.
State and prove Gauss's theorem in electrostatics. Calculate the electric field intensity at a point outside a hollow uniformly charged sphere.
A proton and an electron have the same kinetic energy. Which one has greater de Broglie wavelength and why?
State Kirchhoff's laws and use them to obtain the condition for balance of a Wheatstone bridge.
Write the necessary conditions for total internal reflection of light.
Convert decimal numbers 21 and 43 into their equivalent binary numbers.
Write down two basic differences between interference and diffraction.
Write down the difference between nuclear fission and nuclear fusion.
Mention the two characteristic properties of the material suitable for making the core of a transformer.
Write two properties of paramagnetic substances.
Write Fleming's left hand rule.
Compare the magnetic properties of steel and soft iron.