List of top Questions asked in Bihar Board XII- 2025

Inside a closed surface, n electric dipoles are situated. The electric flux coming out from the closed surface will be
The speed of an electron accelerated from rest under a potential difference \( V \) is
On inserting a dielectric material between two positive charges in air, the value of repulsive force will
If the critical angle for total internal reflection from any medium to vacuum is 30°, then the velocity of light in the medium is.
Image formed by convex mirror is always
In a purely inductive circuit, the power factor is
In an a.c. circuit containing only capacitor, the phase difference between current and voltage is
In a step-up transformer, the value of current in secondary coil compared to the primary coil is
If the number of turns is increased in any moving coil galvanometer, then its sensitivity
At neutral points
Dimensional formula of permeability is.
Unit of \( \frac{{\mu_0}}{{\epsilon_0}} \) is.
The peak value of an alternating current is 10 A. Its root mean square value will be?
When an ammeter is shunted then its measurement limit
The electric field on the outer surface of a charged conductor is
If a conductor is placed in an external electric field, the field inside the conductor will be?
Which of the following statements is true for two point charges of opposite sign?
Gauss’s law states that the electric flux through a closed surface is
Which of the following laws is based on the principle of energy conservation?
Kilowatt-hour (kWh) is the unit of
The capacity of any condenser does not depend upon
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 Monopoly? What are its main features?
Define supply. Mention the causes which determine the supply of a commodity.