List of top Physics Questions asked in Bihar Board Class XII

In an a.c. circuit containing only capacitor, the phase difference between current and voltage is
If the critical angle for total internal reflection from any medium to vacuum is 30°, then the velocity of light in the medium is.
The distance between two charges is made half and one of the charges is also halved. The force acting between the two will become as compared to previous value.
In a purely inductive circuit, the power factor is
Image formed by convex mirror is always
In a step-up transformer, the value of current in secondary coil compared to the primary coil is
At neutral points
Unit of \( \frac{{\mu_0}}{{\epsilon_0}} \) 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?
Dimensional formula of permeability is.
When an ammeter is shunted then its measurement limit
The capacity of any condenser does not depend upon
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?
Kilowatt-hour (kWh) is the unit of
If a conductor is placed in an external electric field, the field inside the conductor will be?
Which of the following laws is based on the principle of energy conservation?
The electric field on the outer surface of a charged conductor is
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?
What is an electric dipole? Find an expression for electric potential at any point due to an electric dipole.
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 \( r \).
What is interference of light? Find an expression for fringe width in Young's double slit experiment.