List of top Physics Questions asked in Bihar Board Class XII

Define wavefront and secondary wavelets. Verify the law of reflection on the basis of Huygens’ wave theory.
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 self-inductance and mutual inductance. Find an expression for mutual inductance of two coaxial solenoids.
State and prove Gauss's theorem in electrostatics. Calculate the electric field intensity at a point outside a hollow uniformly charged sphere.
Explain Bohr's stable orbit.
Mention two different modes of propagation used in communication system.
Explain magnetic moment. Write its SI unit.
Define volume density of charge. Write its SI unit.
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°.
A proton and an electron have the same kinetic energy. Which one has greater de Broglie wavelength and why?
Write two properties of beta rays.
State Kirchhoff's laws and use them to obtain the condition for balance of a Wheatstone bridge.
Write down two basic differences between interference and diffraction.
Convert decimal numbers 21 and 43 into their equivalent binary numbers.
Write the necessary conditions for total internal reflection of light.
Write Fleming's left hand rule.
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.
Compare the magnetic properties of steel and soft iron.
Write two properties of paramagnetic substances.
What do you mean by power of accommodation of eye?
Which of the following devices is based on the principle of electromagnetic induction?
The self-inductance of a solenoid depends on
How does refractive index of any medium depend upon the wavelength of light?