List of top Questions asked in Bihar Board XII

The dielectric constant of a metal is:
Two equal and opposite charges of 5 coulomb are kept mutually at a distance of 50 cm. The electric dipole moment of the system is:
On moving from the surface of a charged metallic sphere to the center of the sphere, the electric field:
If \( n \) electric dipoles are situated inside a closed surface, the total electric flux coming out from the closed surface will be:
In broad-side-on position, the electric potential due to an electric dipole is:
An electron is accelerated through a potential difference of 5 volts. The energy gained by the electron will be:
The relation between electric field \( E \) and electric potential \( V \) is:
The electrostatic energy of the system made by two electric dipoles kept at a distance \( r \) is proportional to:
The unit of linear charge density is:
The dimensional formula of the intensity of electric field is:
The number of electrons present in 8 coulomb negative charge is:
Give a brief account of the role of rail transport in the economic development of India.
Draw a map of India and show the following:
(a) Narmada River
(b) Delhi
(c) Jamshedpur
(d) Mumbai
(e) Chennai
Write a short note on water pollution.
Describe quaternary activities.
What do you mean by density of population?
What is naturalisation of humans?
Name any four Rabi crops of India.
Write the names of two subfields of Human Geography.
Name four ports located on the eastern coast of India.
Mention the location and importance of Mumbai Port.
Describe the characteristics of Green Revolution in India.
What is slum?
Explain the causes of drinking water crisis in India.
Write the names of two regional trade blocs of the world.