List of top Questions asked in Bihar Board XII

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
Three capacitors of capacitance 6 µF are available. The minimum and maximum capacitances obtained are
The root mean square (r.m.s) value of alternating current equation I = 60 sin 100 πt is
The impedance of L-R circuit is
The radius of a circular current loop is made double and the current is made half. The magnetic moment of the loop will become
The self-inductance of a choke coil is 5 henry. The current through it is increasing at a rate of 2 AS\(^{-1}\). The self-induced emf in the choke coil will be
Magnetic moment of the earth is
Nickel is
The angle between magnetic meridian and geographical meridian is called
The radius of curvature of each surface of a biconvex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is
Which physical quantity will be the same for an electron and a photon of the same wavelength?
The function of moderator in nuclear reactor is to
The impurity element used for p-type semiconductor is
Diode is used as
The net charge on a charged capacitor is
The motion of an electron inside a conductor is
The total electric flux coming out from stationary unit positive charge in air is
The force, acting on per unit charge is called
Quantisation of charge indicates that