List of top Physics Questions asked in Bihar Board XII

Two light waves of equal amplitude and equal wavelengths are superimposed. The amplitude of the resultant wave will be maximum when phase difference between them is
In a step-up transformer, the value of current in secondary coil compared to the primary coil is
In an a.c. circuit containing only capacitor, the phase difference between current and voltage is
In a purely inductive circuit, the power factor is
Image formed by convex mirror is always
If the critical angle for total internal reflection from any medium to vacuum is 30°, then the velocity of light in the medium is.
Dimensional formula of permeability is.
If the number of turns is increased in any moving coil galvanometer, then its sensitivity
The peak value of an alternating current is 10 A. Its root mean square value will be?
At neutral points
Unit of \( \frac{{\mu_0}}{{\epsilon_0}} \) is.
When an ammeter is shunted then its measurement limit
Gauss’s law states that the electric flux through a closed surface is
Which of the following statements is true for two point charges of opposite sign?
If a conductor is placed in an external electric field, the field inside the conductor will be?
The capacity of any condenser does not depend upon
Kilowatt-hour (kWh) is the unit of
The electric field on the outer surface of a charged conductor is
Which of the following laws is based on the principle of energy conservation?
Two equal positive point charges of 1 μC charge are kept at a distance of 1 metre in air. The electric potential energy of the system will be.
Which one of the following is the unit of capacity?
Write the properties of diamagnetic, paramagnetic, and ferromagnetic materials.
Describe with diagram the working method of p-n-p and n-p-n transistors.
What is an electric dipole? Find an expression for electric potential at any point due to an electric dipole.
What is interference of light? Find an expression for fringe width in Young's double slit experiment.