List of top Questions asked in Bihar Board Class XII

The colour of the sky is blue due to:
The fringe width in interference of light due to two coherent sources is:
Two sources of monochromatic light are coherent when their:
The de Broglie wavelength is:
Photocell is based on:
Cathode rays are group of:
A large virtual image of an object is formed by:
Powers of two lenses kept in contact are \( P_1 \) and \( P_2 \). The power of the equivalent lens will be:
The wavelength of which colour is minimum?
Which causes the formation of rainbow?
The image formed in a compound microscope is:
The image of any object formed at the retina of the human eye is:
What value of alternating current is measured by a hot wire ammeter?
If magnetic field \( B \) is perpendicular to surface area vector \( \mathbf{ds} \), then the magnetic flux on area \( ds \) will be:
Mean value of alternating current in a full cycle is:
If the phase difference between alternating current and e.m.f is \(\phi\), then the value of power factor is:
In an AC circuit, power is lost in only:
An alternating electric current is represented by the equation \( i = 0.6 \sin 100 \pi t \). The frequency of the alternating current is:
Current used in electroplating is:
A galvanometer is converted into an ammeter by adding:
The magnetic field produced at the centre of a current-carrying circular coil is:
On dividing any magnet of magnetic moment \( M \) parallel to its length into \( n \) equal pieces, the moment of each piece will be:
Which of the following shows hysteresis?
The value of magnetic potential at a distance \( r \) from a pole strength \( m \) is:
What is produced by an induction coil?