List of top Questions asked in Bihar Board Class XII

Explain UNIVAC and Fax.
Explain the difference between nuclear fission and nuclear fusion.
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 are ohmic and non-ohmic resistances? Write down one example of each.
What is an electromagnetic wave? On which factors does its velocity in vacuum depend?
What is a cyclotron? State its two limitations.
Define two magnetic elements of the Earth.
What is an eddy current? Write down its utilities.
Write down the energy losses in a transformer.
Explain the polarization of light.
The equivalent of decimal number 27 in binary number system will be:
In a full wave rectifier, if input frequency is 50 Hz, then output frequency will be:
The device which works for both modulation and demodulation is called:
Distance of communication satellite from the surface of the Earth is:
Attenuation is measured in:
Define intensity of electric field at any point. Write down its S.I. unit.
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?
The half-life of a radioactive substance is:
The S.I. unit of decay constant is:
Number of neutrons in an atom of \(^{230}_{90}\mathrm{Th}\) is:
P-N junction diode is used as:
Instrument used to increase input voltage/current is called:
If in a logic gate output \(Y\) is obtained by the product of its both inputs \(A \cdot B\), then the gate is:
Width of forbidden energy gap in the semiconductor is approximately:
Convex lens is used in: