List of top Physics Questions asked in Bihar Board XII

Write the properties of diamagnetic, paramagnetic, and ferromagnetic materials.
Describe with diagram the working method of p-n-p and n-p-n transistors.
Define self-inductance and write its S.I. unit. Find the self-inductance for a solenoid of \( N \) turns, length \( l \), and radius \( r \).
Explain the difference between nuclear fission and nuclear fusion.
Mention the difference between p-type and n-type semiconductors.
What is a light-emitting diode (LED)? Write down one application of it.
Write down two uses of a shunt.
10$^{19}$ electrons are placed on an uncharged body. Calculate the charge produced on the body.
What is wattless current?
Convert the binary number \(1101\) into the decimal system.
Explain UNIVAC and Fax.
What is the critical angle? Write down its necessary conditions.
Explain the polarization of light.
What is an electromagnetic wave? On which factors does its velocity in vacuum depend?
Find the increase in energy of a condenser of capacity \(6\, \text{pF}\) on changing the potential difference from 10 V to 20 V.
What is an eddy current? Write down its utilities.
What are ohmic and non-ohmic resistances? Write down one example of each.
Write down the energy losses in a transformer.
What is a cyclotron? State its two limitations.
Define two magnetic elements of the Earth.
The device which works for both modulation and demodulation is called:
Distance of communication satellite from the surface of the Earth is:
An electric dipole of dipole moment \(2 \times 10^{-6}\) cm is kept inside a closed surface. What will be the net electric flux coming out from the surface?
Define intensity of electric field at any point. Write down its S.I. unit.
Attenuation is measured in: