List of top Questions asked in Bihar Board Class XII

Show lateral deviation of a beam of light incident obliquely on a glass slab.
Show the formation of image by a concave mirror using a candle and a screen.
Check the continuity of the given circuit by using multimeter.
Determine the resistance per centimetre of the given wire by plotting a graph of potential difference vs current.
Estimate the resistance of a galvanometer by half-deflection method.
Find the focal length of convex mirror using convex lens.
Draw I - V characteristic curve of p-n junction in forward bias and reverse bias.
Determine the refractive index of a glass slab using a travelling microscope.
Determine the refractive index of the material of prism.
Find the focal length of given concave mirror by using two-pin method.
Verify the laws of combination (series or parallel) of resistance using meter bridge.
Find the resistance of a given wire using meter bridge.
Determine the internal resistance of the given primary cell using potentiometer.
State and explain Kirchhoff's laws. Applying these laws, obtain the balanced condition of Wheatstone bridge.
With neat diagram describe the construction and working of an astronomical telescope. Find its magnifying power.
Derive the condition for resonance in the L-C-R series alternating current circuit. Find the expression for resonant frequency.
Explain the working of P-N junction diode. Draw the circuit of full wave rectifier and explain its working.
For a thin lens find the formula \(\frac{1}{f} = (\mu - 1) \left(\frac{1}{R_1} - \frac{1}{R_2}\right)\), where the meaning of symbols is general.
Define magnetic moment. Write its S.I. unit and dimension.
A sphere of radius 5 cm has a charge of 31.41 \(\mu\)C. Calculate the surface density of charge.
Write down two necessary conditions for interference of light.
What will be the path followed by a charged particle moving along a magnetic field.
Define modulation. Write its types.
The horizontal component of earth's magnetic field at any place is \(\sqrt{3}\) times its vertical component. What will be the value of angle of dip at that place?
What is current density? Discuss.