List of top Questions asked in Bihar Board XII

Obtain a lens combination with the specified focal length using two lenses from the given lens.
Demonstrate dispersion of light after passing a white light through a prism.
Compare the e.m.f. of two given cells with the help of potentiometer.
With the help of given bulb, switch and power source, assemble a household circuit.
Identify diode, transistor, LED and I.C. from the given mixed collection.
Show formation of image (nature and size) by a convex lens with the help of a screen and candle.
By using multimeter distinguish between n-p-n and p-n-p transistor.
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.