List of top Questions asked in Bihar Board Class XII

If the distance between the two charges is increased, then the electrostatic potential energy of the charges
Two resistors R and 2R are connected in series in an electric circuit. The thermal energy developed in R and 2R will be in ratio
The symbol \(\rightarrow\!\!|\) is the symbol of
Unit of amplification factor of transistor is
Which one of the following logic gates is universal logic gate?
Waves of UHF frequency are generally transmitted as
The law, governing the force acting between two electric charges known as
A convex lens of focal length 40 cm and a concave lens of focal length 20 cm are in contact. The power of their combination in dioptre is
The reason for the phenomenon of interference is
Which is used to produce polarised light?
A charge 'q' placed at the centre on the line joining two charges 'Q' will be in equilibrium if 'q' will be equal to
What is the angle between the electric dipole moment \(\vec{p}\) and the electric field strength \(\vec{E}\) when the dipole is in a stable equilibrium?
Which of the following physical quantities is a vector?
The value of maximum amplitude produced due to interference of two waves given by \(Y_1 = 4\sin(\omega t)\) and \(Y_2 = 3\cos(\omega t)\) is
The formula for magnetic energy density for a solenoid is
LASER action needs
Light is a transverse wave because it shows
The half-life of a radioactive isotope (\(^{210}\)Bi) is 5 days. The fraction of the nuclei undecayed at the end of 20 days will be
The ratio of electric force and gravitational force acting between two charges is in the order of
The phase difference between electric wave and magnetic wave in the electromagnetic wave is
When the distance between source of light and screen is increased, then fringe width
The unit of radioactivity is
Which of the following has the highest penetrating power?
Which range of frequency is used in TV transmission?
The dispersive power of a prism depends on