List of top Questions asked in Bihar Board XII

By using multimeter distinguish between n-p-n and p-n-p transistor.
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.
Check the continuity of the given circuit by using multimeter.
Show formation of image (nature and size) by a convex lens with the help of a screen and candle.
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.
Determine the refractive index of the material of prism.
Draw I - V characteristic curve of p-n junction in forward bias and reverse bias.
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.
Determine the refractive index of a glass slab using a travelling microscope.
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.
Explain the working of P-N junction diode. Draw the circuit of full wave rectifier and explain its working.
Derive the condition for resonance in the L-C-R series alternating current circuit. Find the expression for resonant frequency.
State and explain Kirchhoff's laws. Applying these laws, obtain the balanced condition of Wheatstone bridge.
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.
With neat diagram describe the construction and working of an astronomical telescope. Find its magnifying power.
What will be the path followed by a charged particle moving along a magnetic field.
Define magnetic moment. Write its S.I. unit and dimension.
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?